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Your search keyword '"Février, O."' showing total 10 results
Start Over Author "Février, O." Topic tcv
10 results on '"Février, O."'

1. Modelling of power exhaust in TCV positive and negative triangularity L-mode plasmas.

Author

Tonello, E, Mombelli, F, Février, O, Alberti, G, Bolzonella, T, Durr-Legoupil-Nicoud, G, Gorno, S, Reimerdes, H, Theiler, C, Vianello, N, and Passoni, M

Subjects
TOKAMAKS, DENSITY, PLASMA boundary layers
Abstract

L-mode negative triangularity (NT) operation is a promising alternative to the positive triangularity (PT) H-mode as a high-confinement edge localised mode-free operational regime. In this work, two TCV Ohmic L-mode core density ramps with opposite triangularity δ ≃ ± 0.3 are investigated using SOLPS-ITER modelling. This numerical study aims to investigate the power exhaust differences between NT and PT focusing, in particular, on the geometrical effect of triangularity. To disentangle the latter from differences related to cross-field transport, anomalous diffusivities for particle ( D n A N ) and energy ( χ e / i A N ) transport are fixed to the same values in PT and NT. The simulation results clearly show dissimilar transport and accumulation of neutral particles in the scrape-off layer for the two configurations. This gives rise to different ionization sources in the edge and divertor regions and produces differences in the poloidal and cross-field fluxes, ultimately leading to different power and particle divertor fluxes in the two configurations. Simulations recover the experimental feature of a hotter and attached outer target ( T e , OSP NT ≳ 5 eV ) in the NT scenario compared to the PT counterpart. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Model-based impurity emission front control using deuterium fueling and nitrogen seeding in TCV

Author

Koenders, J.T.W., Perek, A., Kool, B., Février, O., Ravensbergen, T., Galperti, C., Duval, B.P., Theiler, C., van Berkel, M., team, TCV, Team, EUROfusionMST1, Group Heemels, Control Systems Technology, and Science and Technology of Nuclear Fusion

Subjects
Nuclear and High Energy Physics, detachment control, power exhaust, TCV, impurity seeding, Condensed Matter Physics, system identification
Abstract

This paper presents the first result using nitrogen-seeded exhaust feedback control of the NII impurity emission front in TCV. The NII emission front position is consistently located below its commonly used CIII counterpart, indicating the NII emission front is representative of a colder plasma region. We demonstrate control of the NII impurity emission front position for two cases: (a) using nitrogen seeding as the sole actuator, and (b) using deuterium fueling as an actuator while injecting a small amount of nitrogen that remains a trace impurity. For sole nitrogen actuation, peak target current density is significantly reduced when the NII emission front approaches the x-point (≈50% for the NII front at the halfway point). When actuating with deuterium, peak target current density is less affected, which is explained by changes in fueling engendering a different scrape-off-layer plasma density. Perturbative (system identification) experiments show that nitrogen actuation induces a stronger, but slower, response of the NII emission front than deuterium actuation. Moving the NII emission front back to the target after pushing it towards the x-point has proven difficult, where both the NII front position and total radiated power do not reach pre-seeding conditions within the discharge time following termination of nitrogen injection. This result highlights the need to account for impurity retention for such seeded discharges in exhaust control strategies.

Published
2022
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3. Progress toward divertor detachment on TCV within H-mode operating parameters

Author

Harrison, J.R., Theiler, C., Février, O., de Oliveira, H., Maurizio, R., Verhaegh, K., Perek, A., Karpushov, A., Lipschultz, B., Vijvers, W.A. J., Duval, B.P., Feng, X., Henderson, S., Labit, B., Linehan, B., Merle, A., Reimerdes, H., Sheikh, U., Tsui, C.K., Wuthrich, C., team, TCV, Team, EUROfusionMST1, and Science and Technology of Nuclear Fusion

Subjects
Tokamak, Materials science, plasma physics, Divertor, Flux, Mechanics, Radius, Plasma, divertor detachment, Condensed Matter Physics, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, Nuclear Energy and Engineering, law, 0103 physical sciences, divertor, Seeding, TCV, Tokamak à configuration variable, 010306 general physics, tokamak, Beam (structure)
Abstract

Recent experiments on Tokamak à Configuration Variable have made significant progress toward partial detachment of the outer divertor in neutral beam heated H-mode plasmas in conventional and alternative divertor configurations. The heating power required to enter H-mode was measured in a range of divertor configurations. It is found that at the core densities most favourable for H-mode access, the L–H threshold power is largely independent of the poloidal flux expansion and major radius of the outer divertor, and in the snowflake minus configuration. A factor 2 reduction in the outer divertor power load was achieved in ELM-free (using a fuelling and nitrogen seeding) and ELMy (using nitrogen seeding) H-mode plasmas. No significant reduction in the outer divertor particle flux was achieved in the ELM-free scenarios, compared with ~30% reduction in the most strongly detached ELMy cases. The poloidal flux expansion at the outer divertor was not found to significantly alter the cooling of the divertor in the ELM-free scenarios.

Published
2019
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4. Multi-code simulations of the gas baffle effects on TCV Lower Single Null edge plasmas

Author

Galassi D., Reimerdes H., Theiler C., Wensing M., Bufferand H., Ciraolo G., Innocente P., Marandet Y., Tamain P., Baquero M., Brida D., De Oliveira H., Duval B., Février O., Henderson S., Komm M., Maurizio R., Tsui C.K., the TCV team, and the EUROfusion MST1 Team

Subjects
tokamac configuration variable, edge fusion plasma, TCV
Abstract

A gas baffle is being installed in the vessel of the tokamak à configuration variable (TCV) [1], in order to improve the closure of the divertor region. This upgrade has been envisaged, along with a foreseen increase in the available input power, in order to facilitate the access to detached divertor regimes at lower plasma collisionality, namely in more ITER-relevant conditions. It is necessary, in this framework, to be able to predict the impact of gas baffles, at the same time validating the current numerical tools available for the simulations of the edge plasma. The design of the gas baffle tiles has been supported by SOLPS-ITER simulations of TCV edge plasmas [2]. The optimized parameter is the neutral compression ratio, namely the ratio of neutral density in the divertor region and the one in the main chamber, at a given upstream electron density. The performance of the gas baffles in terms of neutral confinement has been predicted for an ideal case with intermediate plasma current, as a function of plasma density and input power [3]. These simulations predict an improvement of the compression ratio, with the current baffles, of a factor of approximately five for attached low-density plasmas, which increases to up to 10-20 at higher upstream densities. Envisaging a future modification of TCV gas baffles, a further numerical investigation on the optimal baffle extension has been carried out, by means of the SolEdge2D-EIRENE code [4]. The main advantage of this code is the possibility to simulate realistic shapes for plasma-facing components, thus coherently describing plasma parallel fluxes impinging on gas baffles. This analysis shows that the neutral compression factor in detached conditions could be further improved by almost a factor two by extending the Low-Field Side baffle by a few cm. With such a solution, the recycling on the baffle tip would still be acceptable. Both the mentioned numerical tools have been tested against experiments, SOLPS-ITER simulating an average current, Lower Single-Null scenario, and SolEdge2D-EIRENE a case at lower plasma current. Numerical results have been compared to experiments with baffle-compatible plasmas, in absence of the baffle. The density ramp imposed in experiments is reproduced numerically, and it allows the investigation of different divertor conditions. Transport coefficients are chosen to match experimental upstream profiles: numerical results are shown to reproduce, almost in a quantitative way, the experimental results at divertor targets. Keeping transport coefficients fixed, two additional wall geometries have been simulated, one including the High-Field Side baffle, and one with the full gas baffle. With the first experiments in baffled operation, both mentioned tools are tested against experiments: the results of the comparison will be discussed, shedding light on the capability of 2D transport codes of predicting the edge plasma behaviour in presence of gas baffles.

Published
2019

5. Overview of progress in European medium sized tokamaks towards an integrated plasma-edge/wall solution

Author

Eich, T., Beurskens, M., Akers, R., De Masi, G., De Temmerman, G., De Tommasi, G., Delogu, R. S., Dendy, R., Denner, P., Di Troia, C., Dimitrova, M., D’Inca, R., Dorić, V., Albanese, R., Douai, D., Drenik, A., Dudson, B., Dunai, D., Dunne, M., Duval, B. P., Easy, L., Elmore, S., Erdös, B., Esposito, B., Aledda, R., Fable, E., Faitsch, M., Fanni, A., Fedorczak, N., Felici, F., Ferreira, J., Février, O., Ficker, O., Fietz, S., Figini, L., Alessi, E., Figueiredo, A., Fil, A., Fishpool, G., Fitzgerald, M., Fontana, M., Ford, O., Frassinetti, L., Fridström, R., Frigione, D., Fuchert, G., Allan, S., Fuchs, C., Furno Palumbo, M., Futatani, S., Gabellieri, L., Gałązka, K., Galdon-Quiroga, J., Galeani, S., Gallart, D., Gallo, A., Galperti, C., Alves, D., Gao, Y., Garavaglia, S., Garcia-Carrasco, A., Garcia-Lopez, J., Garcia-Munoz, M., Gardarein, J.-L., Garzotti, L., Gaspar, J., Gauthier, E., Geelen, P., Ambrosino, R., Geiger, B., Ghendrih, P., Ghezzi, F., Giacomelli, L., Giannone, L., Giovannozzi, E., Giroud, C., Gleason González, C., Gobbin, M., Goodman, T. P., Amicucci, L., Gorini, G., Gospodarczyk, M., Granucci, G., Gruber, M., Gude, A., Guimarais, L., Guirlet, R., Gunn, J., Hacek, P., Hacquin, S., Anand, H., Ham, C., Happel, T., Harrison, J., Harting, D., Hauer, V., Havlickova, E., Hellsten, T., Helou, W., Henderson, S., Hennequin, P., Anastassiou, G., Heyn, M., Hnat, B., Hölzl, M., Hogeweij, D., Honoré, C., Hopf, C., Horáček, J., Hornung, G., Horváth, L., Huang, Z., Coda, S., Andrèbe, Y., Huber, A., Igitkhanov, J., Igochine, V., Imrisek, M., Innocente, P., Ionita-Schrittwieser, C., Isliker, H., Ivanova-Stanik, I., Jacobsen, A. S., Jacquet, P., Angioni, C., Jakubowski, M., Jardin, A., Jaulmes, F., Jenko, F., Jensen, T., Jeppe Miki Busk, O., Jessen, M., Joffrin, E., Jones, O., Jonsson, T., Apruzzese, G., Kallenbach, A., Kallinikos, N., Kálvin, S., Kappatou, A., Karhunen, J., Karpushov, A., Kasilov, S., Kasprowicz, G., Kendl, A., Kernbichler, W., Ariola, M., Kirk, A., Kjer, S., Klimek, I., Kocsis, G., Kogut, D., Komm, M., Korsholm, S. B., Koslowski, H. R., Koubiti, M., Kovacic, J., Arnichand, H., Kovarik, K., Krawczyk, N., Krbec, J., Krieger, K., Krivska, A., Kube, R., Kudlacek, O., Kurki-Suonio, T., Labit, B., Laggner, F. M., Arter, W., Laguardia, L., Lahtinen, A., Lalousis, P., Lauber, P., Lazányi, N., Lazaros, A., Le, H. B., Lebschy, A., Leddy, J., Lefévre, L., Baciero, A., Lehnen, M., Leipold, F., Lessig, A., Leyland, M., Li, L., Lipschultz, B., Liu, Y. Q., Loarer, T., Loarte, A., Loewenhoff, T., Barnes, M., Lomanowski, B., Loschiavo, V. P., Lunt, T., Lupelli, I., Lux, H., Madsen, J., Maget, P., Maggi, C., Maggiora, R., Magnussen, M. L., Barrera, L., Mailloux, J., Maljaars, B., Malygin, A., Mantica, P., Mantsinen, M., Maraschek, M., Marchand, B., Marconato, N., Marini, C., Marinucci, M., Behn, R., Markovic, T., Marocco, D., Marrelli, L., Martin, Y., Martin Solis, J. R., Martitsch, A., Mastrostefano, S., Mattei, M., Matthews, G., Mavridis, M., Hakola, A., Bencze, A., Mayoral, M.-L., Mazon, D., McCarthy, P., McAdams, R., McArdle, G., McClements, K., McDermott, R., McMillan, B., Meisl, G., Bernardo, J., Merle, A., Meyer, O., Milanesio, D., Militello, F., Miron, I. G., Mitosinkova, K., Mlynar, J., Mlynek, A., Molina, D., Molina, P., Bernert, M., Monakhov, I., Morales, J., Moreau, D., Morel, P., Moret, J.-M., Moro, A., Moulton, D., Müller, H. W., Nabais, F., Nardon, E., Bettini, P., Naulin, V., Nemes-Czopf, A., Nespoli, F., Neu, R., Nielsen, A. H., Nielsen, S. K., Nikolaeva, V., Nimb, S., Nocente, M., Nouailletas, R., Bilková, P., Nowak, S., Oberkofler, M., Oberparleiter, M., Ochoukov, R., Odstrčil, T., Olsen, J., Omotani, J., O’Mullane, M. G., Orain, F., Osterman, N., Bin, W., Paccagnella, R., Pamela, S., Pangione, L., Panjan, M., Papp, G., Papřok, R., Parail, V., Parra, F. I., Pau, A., Pautasso, G., Birkenmeier, G., Pehkonen, S.-P., Pereira, A., Perelli Cippo, E., Pericoli Ridolfini, V., Peterka, M., Petersson, P., Petrzilka, V., Piovesan, P., Piron, C., Pironti, A., Bizarro, J. P. S., Pisano, F., Pisokas, T., Pitts, R., Ploumistakis, I., Plyusnin, V., Pokol, G., Poljak, D., Pölöskei, P., Popovic, Z., Pór, G., Blanchard, P., Porte, L., Potzel, S., Predebon, I., Preynas, M., Primc, G., Pucella, G., Puiatti, M. E., Pütterich, T., Rack, M., Ramogida, G., Blanken, T., Rapson, C., Rasmussen, J. Juul, Rasmussen, J., Rattá, G. A., Ratynskaia, S., Ravera, G., Réfy, D., Reich, M., Reimerdes, H., Reimold, F., Martin, P., Bluteau, M., Reinke, M., Reiser, D., Resnik, M., Reux, C., Ripamonti, D., Rittich, D., Riva, G., Rodriguez-Ramos, M., Rohde, V., Rosato, J., Bobkov, V., Ryter, F., Saarelma, S., Sabot, R., Saint-Laurent, F., Salewski, M., Salmi, A., Samaddar, D., Sanchis-Sanchez, L., Santos, J., Sauter, O., Bogar, O., Scannell, R., Scheffer, M., Schneider, B., Schneider, P., Schneller, M., Schrittwieser, R., Schweinzer, J., Seidl, J., Sertoli, M., Šesnić, S., Böhm, P., Shabbir, A., Shalpegin, A., Shanahan, B., Sharapov, S., Sheikh, U., Sias, G., Sieglin, B., Silva, C., Silva, A., Silva Fuglister, M., Bolzonella, T., Simpson, J., Snicker, A., Sommariva, C., Sozzi, C., Spagnolo, S., Spizzo, G., Spolaore, M., Stange, T., Stejner Pedersen, M., Stepanov, I., Boncagni, L., Stober, J., Strand, P., Šušnjara, A., Suttrop, W., Szepesi, T., Tál, B., Tala, T., Tamain, P., Tardini, G., Tardocchi, M., Botrugno, A., Teplukhina, A., Terranova, D., Theiler, C., Thornton, A., Tolias, P., Tophøj, L., Treutterer, W., Trevisan, G. L., Tsironis, C., Tsui, C., Bottereau, C., Tudisco, O., Uccello, A., Urban, J., Valisa, M., Vallejos, P., Valovic, M., Van den Brand, H., Vanovac, B., Varoutis, S., Vartanian, S., Bouquey, F., Vega, J., Verdoolaege, G., Verhaegh, K., Vermare, L., Vianello, N., Vicente, J., Viezzer, E., Vignitchouk, L., Vijvers, W. A. J., Villone, F., Bourdelle, C., Viola, B., Vlahos, L., Voitsekhovitch, I., Vondráček, P., Vu, N. M. T., Walkden, N., Wang, N., Weiland, M., Weinzettl, V., Westerhof, E., Adamek, J., Brémond, S., Wiesenberger, M., Willensdorfer, M., Wischmeier, M., Wodniak, I., Wolfrum, E., Yadykin, D., Zagórski, R., Zammuto, I., Zanca, P., Zaplotnik, R., Brezinsek, S., Zestanakis, P., Zhang, W., Zoletnik, S., Zuin, M., Meyer, H., Schubert, M., Schneider, M., Wauters, T., Wagner, D., Testa, D., Brida, D., Tripsky, M., Liang, Yunfeng, Lyssoivan, A., Lang, P., Garcia, J., Hall, S., Decker, J., Kim, D., Brochard, F., Buchanan, J., Bufferand, H., Buratti, P., Cahyna, P., Calabrò, G., Camenen, Y., Agostini, M., Caniello, R., Cannas, B., Canton, A., Cardinali, A., Carnevale, D., Carr, M., Carralero, D., Carvalho, P., Casali, L., Castaldo, C., Aguiam, D., Castejón, F., Castro, R., Causa, F., Cavazzana, R., Cavedon, M., Cecconello, M., Ceccuzzi, S., Cesario, R., Challis, C. D., Chapman, I. T., Ahn, J., Chapman, S., Chernyshova, M., Choi, D., Cianfarani, C., Ciraolo, G., Citrin, J., Clairet, F., Classen, I., Coelho, R., Coenen, J. W., Aho-Mantila, L., Colas, L., Conway, G., Corre, Y., Costea, S., Crisanti, F., Cruz, N., Cseh, G., Czarnecka, A., D’Arcangelo, O., De Angeli, M., European Commission, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Max Planck Institut für Plasma Physik and Excellence Cluster, Ecole Polytechnique Federale de Lausanne (EPFL), MilliLab, VTT Technical Research Centre of Finland, Consorzio Interuniversitario per la Fisica Spaziale (CIFS), Institute of Plasma Physics AS CR, Za Slovankou 1782/3, 182 00 Praha 8, Czechia, Instituto Superior Técnico, Universidade de Lisboa (IST), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), University of Naples Federico II = Università degli studi di Napoli Federico II, Università degli Studi di Cagliari = University of Cagliari (UniCa), Istituto di Fisica del Plasma, Consiglio Nazionale delle Ricerche (IFP-CNR), University of Napoli Parthenope, Consorzio CREATE, Via Claudio 21, 80125 Napoli, Italy, ENEA-Frascati, Physics Division, National Technical University of Athens, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Rudolf Peierls Centre for Theoretical Physics, European Southern Observatory (ESO), KFKI Research Institute for Particle and Nuclear Physics (KFKI-RMKI), Eindhoven University of Technology, Department of Physics, University of Strathclyde, Forschungszentrum Julich GmbH, Institut fur Energie- und Klimaforschung---Plasmaphysik, 52425 Julich, Germany, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma Tor Vergata [Roma], Department of Physics and Astronomy, Uppsala University, University of Warwick [Coventry], Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497 Warsaw, Poland, FOM Institute DIFFER - Dutch Institute for Fundamental Energy Research, The Netherlands, Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck, ITER organization (ITER), Fakultet Elektrotehnike, Strojarstva i Brodogradnje, University of Split (FESB), J. Stefan Institute, York Plasma Institute, Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom, Institute of Nuclear Techniques, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary, Fusion Plasma Physics, EES, KTH, SE-10044 Stockholm, Sweden, Earth Sciences Division, Barcelona Supercomputing Center, Sevilla, Institut für Prozessdatenverarbeitung und Elektronik (IPE), Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB), Laboratoire de Physique des Plasmas (LPP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Karl-Franzens-Universität Graz, Laboratory for Plasma Physics Koninklijke Militaire School---Ecole Royale Militaire Renaissancelaan 30 Avenue de la Renaissance B-1000, Brussels, Belgium, Observatoire Royal de Belgique (ORB), Department of Physics, Aristotle University of Thessaloniki, Danmarks Tekniske Universitet = Technical University of Denmark (DTU), Department of Applied Physics, Aalto University, PO Box 14100, FI-00076 Aalto, Finland, Institut fur Angewandte Physik, Technische Universitat Wien, Wiedner Hauptstrase 8-10, 1040 Wien, Austria, Department of Physics, University of Helsinki, Foundation for Research and Technology Hellas (FORTH), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Department of Physics, Durham University, Durham, DH1 3LE, United Kingdom, Università degli studi di Torino = University of Turin (UNITO), ENEA/CREATE, DIEI, Universita di Cassino, Via Di Biasio 43, 03043, Cassino (FR), Italy, University College Cork, Physics Department, National Institute of Physics and Nuclear Engineering (NIPNE), Department of Earth and Space Sciences, Chalmers University of Technology, SE-41296 Gothenburg, Sweden, Institut Charles Sadron (ICS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Max-Planck-Institut für Plasmaphysik [Garching] (IPP), EURATOM/CCFE Fusion Association, Culham Science Centre [Abingdon], Capgènes, Institute of Plasma Physics, Association Euratom/IPP.CR (IPP PRAGUE), Czech Academy of Sciences [Prague] (ASCR), VTT Technical Research Centre of Finland (VTT), Assoc. Euratom-ENEA-CREATE, Universita Mediterranea of Reggio Calabria [Reggio Calabria], Università degli studi di Napoli Federico II, Universidad Metropolitana de Ciencias de la Educación (UMCE), Laboratoire de Biométrie et Biologie Evolutive - UMR 5558 (LBBE), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Institute of Energy and Climate Research - Plasma Physics (IEK-4), Forschungszentrum Jülich GmbH, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institute of Plasma Physics [Praha], Institut des Sciences et Ingénierie Chimiques (ISIC), Ecole Polytechnique Fédérale de Lausanne (EPFL), Universidade do Minho, Institute of Plasma Physics and Laser Microfusion [Warsaw] (IPPLM), Instituto de Plasmas e Fusão Nuclear [Lisboa] (IPFN), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Associazone EURATOM ENEA sulla Fusione, EURATOM, Institut für Physik, University of Basel (Unibas), Ferdinand-Braun-Institut für Höchtstfrequenztechnik (FBH), Forschungsverbund Berlin e.V., Institut de biologie moléculaire des plantes (IBMP), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), Génétique du cancer et des maladies neuropsychiatriques (GMFC), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Culham Centre for Fusion Energy (CCFE), Department of Physics [Stockholm], Stockholm University, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Key Laboratory of Molecular Virology & Immunology (LMVI), Institut Pasteur de Shanghai, Académie des Sciences de Chine - Chinese Academy of Sciences (IPS-CAS), Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP), Laboratoire Chrono-environnement - UFC (UMR 6249) (LCE), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Sygen International Plc, IEAP, Christian-Albrechts-Universität zu Kiel (CAU), PSL Research University (PSL)-PSL Research University (PSL)-École polytechnique (X)-Sorbonne Universités-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Space and Astrophysics [Coventry], Association interdépartementale pour la gestion du réseau automatique de surveillance de la pollution atmosphérique et d'alerte en région Ile-de-France, AIRPARIF, Institute of Plasma Physics, Association EURATOM (IPP PRAGUE), CEA Cadarache, Warsaw University of Technology [Warsaw], Forschungszentrum Julich - Institut Energie & Klimaforsch, An-Institut für Qualitätssicherung in der operativen Medizin (gGmbH) an der Otto-von-Guericke Universität Magdeburg (An-Institut), Laboratoire de Conception et d'Intégration des Systèmes (LCIS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Université Grenoble Alpes (UGA), ITER [St. Paul-lez-Durance], ITER, York Plasma Institute (YPI), University of York [York, UK], Dept. of Physics, University of Wisconsin-Madison, Association EURATOM-CEA (CEA/DSM/DRFC), Euratom/UKEAE Fusion Association (JET), UKEA, European Synchrotron Radiation Facility (ESRF), Department of Radiology, St. James's Hospital, Department of Electronics, Politecnico di Torino [Torino] (Polito), Instituto Andaluz de Geofísica y Prevención de Desastres Sísmicos [Granada] (IAGPDS), Universidad de Granada (UGR), Etablissement français du sang [Besançon] (EFS), Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, Via R. Cozzi 53, 20125 Milano, Italy, Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Czech Academy of Sciences [Prague] (CAS), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Universidade do Minho = University of Minho [Braga], Forschungsverbund Berlin e.V. (FVB) (FVB), Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Helmholtz-Gemeinschaft = Helmholtz Association, Institut für Experimentelle und Angewandte Physik [Kiel] (IEAP), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Politecnico di Torino = Polytechnic of Turin (Polito), Universidad de Granada = University of Granada (UGR), Swiss Plasma Center (SPC), Meyer, H., Eich, T., Beurskens, M., Coda, S., Hakola, A., Martin, P., Adamek, J., Agostini, M., Aguiam, D., Ahn, J., Aho-Mantila, L., Akers, R., Albanese, R., Aledda, R., Alessi, E., Allan, S., Alves, D., Ambrosino, R., Amicucci, L., Anand, H., Anastassiou, G., Andrèbe, Y., Angioni, C., Apruzzese, G., Ariola, M., Arnichand, H., Arter, W., Baciero, A., Barnes, M., Barrera, L., Behn, R., Bencze, A., Bernardo, J., Bernert, M., Bettini, P., Bilková, P., Bin, W., Birkenmeier, G., Bizarro, J. P. S., Blanchard, P., Blanken, T., Bluteau, M., Bobkov, V., Bogar, O., Böhm, P., Bolzonella, T., Boncagni, L., Botrugno, A., Bottereau, C., Bouquey, F., Bourdelle, C., Brémond, S., Brezinsek, S., Brida, D., Brochard, F., Buchanan, J., Bufferand, H., Buratti, P., Cahyna, P., Calabrò, G., Camenen, Y., Caniello, R., Cannas, B., Canton, A., Cardinali, A., Carnevale, D., Carr, M., Carralero, D., Carvalho, P., Casali, L., Castaldo, C., Castejón, F., Castro, R., Causa, F., Cavazzana, R., Cavedon, M., Cecconello, M., Ceccuzzi, S., Cesario, R., Challis, C. D., Chapman, I. T., Chapman, S., Chernyshova, M., Choi, D., Cianfarani, C., Ciraolo, G., Citrin, J., Clairet, F., Classen, I., Coelho, R., Coenen, J. W., Colas, L., Conway, G., Corre, Y., Costea, S., Crisanti, F., Cruz, N., Cseh, G., Czarnecka, A., D’Arcangelo, O., De Angeli, M., De Masi, G., De Temmerman, G., De Tommasi, G., Decker, J., Delogu, R. S., Dendy, R., Denner, P., Di Troia, C., Dimitrova, M., D’Inca, R., Dorić, V., Douai, D., Drenik, A., Dudson, B., Dunai, D., Dunne, M., Duval, B. P., Easy, L., Elmore, S., Erdös, B., Esposito, B., Fable, E., Faitsch, M., Fanni, A., Fedorczak, N., Felici, F., Ferreira, J., Février, O., Ficker, O., Fietz, S., Figini, L., Figueiredo, A., Fil, A., Fishpool, G., Fitzgerald, M., Fontana, M., Ford, O., Frassinetti, L., Fridström, R., Frigione, D., Fuchert, G., Fuchs, C., Furno Palumbo, M., Futatani, S., Gabellieri, L., Gałązka, K., Galdon-Quiroga, J., Galeani, S., Gallart, D., Gallo, A., Galperti, C., Gao, Y., Garavaglia, S., Garcia, J., Garcia-Carrasco, A., Garcia-Lopez, J., Garcia-Munoz, M., Gardarein, J. -L., Garzotti, L., Gaspar, J., Gauthier, E., Geelen, P., Geiger, B., Ghendrih, P., Ghezzi, F., Giacomelli, L., Giannone, L., Giovannozzi, E., Giroud, C., Gleason González, C., Gobbin, M., Goodman, T. P., Gorini, G., Gospodarczyk, M., Granucci, G., Gruber, M., Gude, A., Guimarais, L., Guirlet, R., Gunn, J., Hacek, P., Hacquin, S., Hall, S., Ham, C., Happel, T., Harrison, J., Harting, D., Hauer, V., Havlickova, E., Hellsten, T., Helou, W., Henderson, S., Hennequin, P., Heyn, M., Hnat, B., Hölzl, M., Hogeweij, D., Honoré, C., Hopf, C., Horáček, J., Hornung, G., Horváth, L., Huang, Z., Huber, A., Igitkhanov, J., Igochine, V., Imrisek, M., Innocente, P., Ionita-Schrittwieser, C., Isliker, H., Ivanova-Stanik, I., Jacobsen, A. S., Jacquet, P., Jakubowski, M., Jardin, A., Jaulmes, F., Jenko, F., Jensen, T., Jeppe Miki Busk, O., Jessen, M., Joffrin, E., Jones, O., Jonsson, T., Kallenbach, A., Kallinikos, N., Kálvin, S., Kappatou, A., Karhunen, J., Karpushov, A., Kasilov, S., Kasprowicz, G., Kendl, A., Kernbichler, W., Kim, D., Kirk, A., Kjer, S., Klimek, I., Kocsis, G., Kogut, D., Komm, M., Korsholm, S. B., Koslowski, H. R., Koubiti, M., Kovacic, J., Kovarik, K., Krawczyk, N., Krbec, J., Krieger, K., Krivska, A., Kube, R., Kudlacek, O., Kurki-Suonio, T., Labit, B., Laggner, F. M., Laguardia, L., Lahtinen, A., Lalousis, P., Lang, P., Lauber, P., Lazányi, N., Lazaros, A., Le, H. B., Lebschy, A., Leddy, J., Lefévre, L., Lehnen, M., Leipold, F., Lessig, A., Leyland, M., Li, L., Liang, Y., Lipschultz, B., Liu, Y. Q., Loarer, T., Loarte, A., Loewenhoff, T., Lomanowski, B., Loschiavo, V. P., Lunt, T., Lupelli, I., Lux, H., Lyssoivan, A., Madsen, J., Maget, P., Maggi, C., Maggiora, R., Magnussen, M. L., Mailloux, J., Maljaars, B., Malygin, A., Mantica, P., Mantsinen, M., Maraschek, M., Marchand, B., Marconato, N., Marini, C., Marinucci, M., Markovic, T., Marocco, D., Marrelli, L., Martin, Y., Martin Solis, J. R., Martitsch, A., Mastrostefano, S., Mattei, M., Matthews, G., Mavridis, M., Mayoral, M. -L., Mazon, D., Mccarthy, P., Mcadams, R., Mcardle, G., Mcclements, K., Mcdermott, R., Mcmillan, B., Meisl, G., Merle, A., Meyer, O., Milanesio, D., Militello, F., Miron, I. G., Mitosinkova, K., Mlynar, J., Mlynek, A., Molina, D., Molina, P., Monakhov, I., Morales, J., Moreau, D., Morel, P., Moret, J. -M., Moro, A., Moulton, D., Müller, H. W., Nabais, F., Nardon, E., Naulin, V., Nemes-Czopf, A., Nespoli, F., Neu, R., Nielsen, A. H., Nielsen, S. K., Nikolaeva, V., Nimb, S., Nocente, M., Nouailletas, R., Nowak, S., Oberkofler, M., Oberparleiter, M., Ochoukov, R., Odstrčil, T., Olsen, J., Omotani, J., O’Mullane, M. G., Orain, F., Osterman, N., Paccagnella, R., Pamela, S., Pangione, L., Panjan, M., Papp, G., Papřok, R., Parail, V., Parra, F. I., Pau, A., Pautasso, G., Pehkonen, S. -P., Pereira, A., Perelli Cippo, E., Pericoli Ridolfini, V., Peterka, M., Petersson, P., Petrzilka, V., Piovesan, P., Piron, C., Pironti, A., Pisano, F., Pisokas, T., Pitts, R., Ploumistakis, I., Plyusnin, V., Pokol, G., Poljak, D., Pölöskei, P., Popovic, Z., Pór, G., Porte, L., Potzel, S., Predebon, I., Preynas, M., Primc, G., Pucella, G., Puiatti, M. E., Pütterich, T., Rack, M., Ramogida, G., Rapson, C., Rasmussen, J. Juul, Rasmussen, J., Rattá, G. A., Ratynskaia, S., Ravera, G., Réfy, D., Reich, M., Reimerdes, H., Reimold, F., Reinke, M., Reiser, D., Resnik, M., Reux, C., Ripamonti, D., Rittich, D., Riva, G., Rodriguez-Ramos, M., Rohde, V., Rosato, J., Ryter, F., Saarelma, S., Sabot, R., Saint-Laurent, F., Salewski, M., Salmi, A., Samaddar, D., Sanchis-Sanchez, L., Santos, J., Sauter, O., Scannell, R., Scheffer, M., Schneider, M., Schneider, B., Schneider, P., Schneller, M., Schrittwieser, R., Schubert, M., Schweinzer, J., Seidl, J., Sertoli, M., Šesnić, S., Shabbir, A., Shalpegin, A., Shanahan, B., Sharapov, S., Sheikh, U., Sias, G., Sieglin, B., Silva, C., Silva, A., Silva Fuglister, M., Simpson, J., Snicker, A., Sommariva, C., Sozzi, C., Spagnolo, S., Spizzo, G., Spolaore, M., Stange, T., Stejner Pedersen, M., Stepanov, I., Stober, J., Strand, P., Šušnjara, A., Suttrop, W., Szepesi, T., Tál, B., Tala, T., Tamain, P., Tardini, G., Tardocchi, M., Teplukhina, A., Terranova, D., Testa, D., Theiler, C., Thornton, A., Tolias, P., Tophøj, L., Treutterer, W., Trevisan, G. L., Tripsky, M., Tsironis, C., Tsui, C., Tudisco, O., Uccello, A., Urban, J., Valisa, M., Vallejos, P., Valovic, M., Van den Brand, H., Vanovac, B., Varoutis, S., Vartanian, S., Vega, J., Verdoolaege, G., Verhaegh, K., Vermare, L., Vianello, N., Vicente, J., Viezzer, E., Vignitchouk, L., Vijvers, W. A. J., Villone, F., Viola, B., Vlahos, L., Voitsekhovitch, I., Vondráček, P., Vu, N. M. T., Wagner, D., Walkden, N., Wang, N., Wauters, T., Weiland, M., Weinzettl, V., Westerhof, E., Wiesenberger, M., Willensdorfer, M., Wischmeier, M., Wodniak, I., Wolfrum, E., Yadykin, D., Zagórski, R., Zammuto, I., Zanca, P., Zaplotnik, R., Zestanakis, P., Zhang, W., Zoletnik, S., Zuin, M., Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Meyer, H, Eich, T, Beurskens, M, Coda, S, Hakola, A, Martin, P, Adamek, J, Agostini, M, Aguiam, D, Ahn, J, Aho-Mantila, L, Akers, R, Albanese, R, Aledda, R, Alessi, E, Allan, S, Alves, D, Ambrosino, R, Amicucci, L, Anand, H, Anastassiou, G, Andrãbe, Y, Angioni, C, Apruzzese, G, Ariola, M, Arnichand, H, Arter, W, Baciero, A, Barnes, M, Barrera, L, Behn, R, Bencze, A, Bernardo, J, Bernert, M, Bettini, P, Bilkovã¡, P, Bin, W, Birkenmeier, G, Bizarro, J, Blanchard, P, Blanken, T, Bluteau, M, Bobkov, V, Bogar, O, Bã¶hm, P, Bolzonella, T, Boncagni, L, Botrugno, A, Bottereau, C, Bouquey, F, Bourdelle, C, Brã©mond, S, Brezinsek, S, Brida, D, Brochard, F, Buchanan, J, Bufferand, H, Buratti, P, Cahyna, P, Calabrã², G, Camenen, Y, Caniello, R, Cannas, B, Canton, A, Cardinali, A, Carnevale, D, Carr, M, Carralero, D, Carvalho, P, Casali, L, Castaldo, C, Castejã³n, F, Castro, R, Causa, F, Cavazzana, R, Cavedon, M, Cecconello, M, Ceccuzzi, S, Cesario, R, Challis, C, Chapman, I, Chapman, S, Chernyshova, M, Choi, D, Cianfarani, C, Ciraolo, G, Citrin, J, Clairet, F, Classen, I, Coelho, R, Coenen, J, Colas, L, Conway, G, Corre, Y, Costea, S, Crisanti, F, Cruz, N, Cseh, G, Czarnecka, A, D'Arcangelo, O, De Angeli, M, De Masi, G, De Temmerman, G, De Tommasi, G, Decker, J, Delogu, R, Dendy, R, Denner, P, Di Troia, C, Dimitrova, M, D'Inca, R, Dorić, V, Douai, D, Drenik, A, Dudson, B, Dunai, D, Dunne, M, Duval, B, Easy, L, Elmore, S, Erdã¶s, B, Esposito, B, Fable, E, Faitsch, M, Fanni, A, Fedorczak, N, Felici, F, Ferreira, J, Fã©vrier, O, Ficker, O, Fietz, S, Figini, L, Figueiredo, A, Fil, A, Fishpool, G, Fitzgerald, M, Fontana, M, Ford, O, Frassinetti, L, Fridstrã¶m, R, Frigione, D, Fuchert, G, Fuchs, C, Furno Palumbo, M, Futatani, S, Gabellieri, L, GaÅ‚azka, K, Galdon-Quiroga, J, Galeani, S, Gallart, D, Gallo, A, Galperti, C, Gao, Y, Garavaglia, S, Garcia, J, Garcia-Carrasco, A, Garcia-Lopez, J, Garcia-Munoz, M, Gardarein, J, Garzotti, L, Gaspar, J, Gauthier, E, Geelen, P, Geiger, B, Ghendrih, P, Ghezzi, F, Giacomelli, L, Giannone, L, Giovannozzi, E, Giroud, C, Gleason González, C, Gobbin, M, Goodman, T, Gorini, G, Gospodarczyk, M, Granucci, G, Gruber, M, Gude, A, Guimarais, L, Guirlet, R, Gunn, J, Hacek, P, Hacquin, S, Hall, S, Ham, C, Happel, T, Harrison, J, Harting, D, Hauer, V, Havlickova, E, Hellsten, T, Helou, W, Henderson, S, Hennequin, P, Heyn, M, Hnat, B, Hã¶lzl, M, Hogeweij, D, Honorã©, C, Hopf, C, Horã¡ä ek, J, Hornung, G, Horvã¡th, L, Huang, Z, Huber, A, Igitkhanov, J, Igochine, V, Imrisek, M, Innocente, P, Ionita-Schrittwieser, C, Isliker, H, Ivanova-Stanik, I, Jacobsen, A, Jacquet, P, Jakubowski, M, Jardin, A, Jaulmes, F, Jenko, F, Jensen, T, Jeppe Miki Busk, O, Jessen, M, Joffrin, E, Jones, O, Jonsson, T, Kallenbach, A, Kallinikos, N, Kã¡lvin, S, Kappatou, A, Karhunen, J, Karpushov, A, Kasilov, S, Kasprowicz, G, Kendl, A, Kernbichler, W, Kim, D, Kirk, A, Kjer, S, Klimek, I, Kocsis, G, Kogut, D, Komm, M, Korsholm, S, Koslowski, H, Koubiti, M, Kovacic, J, Kovarik, K, Krawczyk, N, Krbec, J, Krieger, K, Krivska, A, Kube, R, Kudlacek, O, Kurki-Suonio, T, Labit, B, Laggner, F, Laguardia, L, Lahtinen, A, Lalousis, P, Lang, P, Lauber, P, Lazã¡nyi, N, Lazaros, A, Le, H, Lebschy, A, Leddy, J, Lefã©vre, L, Lehnen, M, Leipold, F, Lessig, A, Leyland, M, Li, L, Liang, Y, Lipschultz, B, Liu, Y, Loarer, T, Loarte, A, Loewenhoff, T, Lomanowski, B, Loschiavo, V, Lunt, T, Lupelli, I, Lux, H, Lyssoivan, A, Madsen, J, Maget, P, Maggi, C, Maggiora, R, Magnussen, M, Mailloux, J, Maljaars, B, Malygin, A, Mantica, P, Mantsinen, M, Maraschek, M, Marchand, B, Marconato, N, Marini, C, Marinucci, M, Markovic, T, Marocco, D, Marrelli, L, Martin, Y, Martin Solis, J, Martitsch, A, Mastrostefano, S, Mattei, M, Matthews, G, Mavridis, M, Mayoral, M, Mazon, D, Mccarthy, P, Mcadams, R, Mcardle, G, Mcclements, K, Mcdermott, R, Mcmillan, B, Meisl, G, Merle, A, Meyer, O, Milanesio, D, Militello, F, Miron, I, Mitosinkova, K, Mlynar, J, Mlynek, A, Molina, D, Molina, P, Monakhov, I, Morales, J, Moreau, D, Morel, P, Moret, J, Moro, A, Moulton, D, Mã¼ller, H, Nabais, F, Nardon, E, Naulin, V, Nemes-Czopf, A, Nespoli, F, Neu, R, Nielsen, A, Nielsen, S, Nikolaeva, V, Nimb, S, Nocente, M, Nouailletas, R, Nowak, S, Oberkofler, M, Oberparleiter, M, Ochoukov, R, Odsträ il, T, Olsen, J, Omotani, J, O'Mullane, M, Orain, F, Osterman, N, Paccagnella, R, Pamela, S, Pangione, L, Panjan, M, Papp, G, PapÅ™ok, R, Parail, V, Parra, F, Pau, A, Pautasso, G, Pehkonen, S, Pereira, A, Perelli Cippo, E, Pericoli Ridolfini, V, Peterka, M, Petersson, P, Petrzilka, V, Piovesan, P, Piron, C, Pironti, A, Pisano, F, Pisokas, T, Pitts, R, Ploumistakis, I, Plyusnin, V, Pokol, G, Poljak, D, Pã¶lã¶skei, P, Popovic, Z, Pã³r, G, Porte, L, Potzel, S, Predebon, I, Preynas, M, Primc, G, Pucella, G, Puiatti, M, Pã¼tterich, T, Rack, M, Ramogida, G, Rapson, C, Rasmussen, J, Rattã¡, G, Ratynskaia, S, Ravera, G, Rã©fy, D, Reich, M, Reimerdes, H, Reimold, F, Reinke, M, Reiser, D, Resnik, M, Reux, C, Ripamonti, D, Rittich, D, Riva, G, Rodriguez-Ramos, M, Rohde, V, Rosato, J, Ryter, F, Saarelma, S, Sabot, R, Saint-Laurent, F, Salewski, M, Salmi, A, Samaddar, D, Sanchis-Sanchez, L, Santos, J, Sauter, O, Scannell, R, Scheffer, M, Schneider, M, Schneider, B, Schneider, P, Schneller, M, Schrittwieser, R, Schubert, M, Schweinzer, J, Seidl, J, Sertoli, M, Å&nbsp, esnić, S, Shabbir, A, Shalpegin, A, Shanahan, B, Sharapov, S, Sheikh, U, Sias, G, Sieglin, B, Silva, C, Silva, A, Silva Fuglister, M, Simpson, J, Snicker, A, Sommariva, C, Sozzi, C, Spagnolo, S, Spizzo, G, Spolaore, M, Stange, T, Stejner Pedersen, M, Stepanov, I, Stober, J, Strand, P, uÅ¡njara, A, Suttrop, W, Szepesi, T, Tã¡l, B, Tala, T, Tamain, P, Tardini, G, Tardocchi, M, Teplukhina, A, Terranova, D, Testa, D, Theiler, C, Thornton, A, Tolias, P, Tophj, L, Treutterer, W, Trevisan, G, Tripsky, M, Tsironis, C, Tsui, C, Tudisco, O, Uccello, A, Urban, J, Valisa, M, Vallejos, P, Valovic, M, Van Den Brand, H, Vanovac, B, Varoutis, S, Vartanian, S, Vega, J, Verdoolaege, G, Verhaegh, K, Vermare, L, Vianello, N, Vicente, J, Viezzer, E, Vignitchouk, L, Vijvers, W, Villone, F, Viola, B, Vlahos, L, Voitsekhovitch, I, Vondrã¡ä ek, P, Vu, N, Wagner, D, Walkden, N, Wang, N, Wauters, T, Weiland, M, Weinzettl, V, Westerhof, E, Wiesenberger, M, Willensdorfer, M, Wischmeier, M, Wodniak, I, Wolfrum, E, Yadykin, D, Zagã³rski, R, Zammuto, I, Zanca, P, Zaplotnik, R, Zestanakis, P, Zhang, W, Zoletnik, S, Zuin, M, Institut Charles Sadron ( ICS ), Université de Strasbourg ( UNISTRA ) -Centre National de la Recherche Scientifique ( CNRS ) -Matériaux et nanosciences d'Alsace, Université de Strasbourg ( UNISTRA ) -Université de Haute-Alsace (UHA) Mulhouse - Colmar ( Université de Haute-Alsace (UHA) ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ) -Université de Haute-Alsace (UHA) Mulhouse - Colmar ( Université de Haute-Alsace (UHA) ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Centre National de la Recherche Scientifique ( CNRS ) -Réseau nanophotonique et optique, Université de Strasbourg ( UNISTRA ) -Université de Haute-Alsace (UHA) Mulhouse - Colmar ( Université de Haute-Alsace (UHA) ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Max-Planck-Institut für Plasmaphysik [Garching] ( IPP ), Culham Science Centre, Institute of Plasma Physics, Association Euratom/IPP.CR ( IPP PRAGUE ), Czech Academy of Sciences [Prague] ( ASCR ), VTT Technical Research Centre of Finland ( VTT ), Univ. Mediterranea RC, Universidad Metropolitana de Ciencias de la Educación ( UMCE ), Laboratoire de Biométrie et Biologie Evolutive ( LBBE ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique ( Inria ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Recherche sur la Fusion par confinement Magnétique ( IRFM ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Institute of Energy and Climate Research - Plasma Physics ( IEK-4 ), Laboratoire Leprince-Ringuet ( LLR ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), Physique des interactions ioniques et moléculaires ( PIIM ), Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ), Institut des Sciences et Ingénierie Chimiques ( ISIC ), Ecole Polytechnique Fédérale de Lausanne ( EPFL ), Institute of Plasma Physics and Laser Microfusion [Warsaw] ( IPPLM ), Instituto de Plasmas e Fusão Nuclear [Lisboa] ( IPFN ), Instituto Superior Técnico, Universidade Técnica de Lisboa ( IST ), University of Basel ( Unibas ), Ferdinand-Braun-Institut für Höchtstfrequenztechnik ( FBH ), Institut de biologie moléculaire des plantes ( IBMP ), Université de Strasbourg ( UNISTRA ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de glaciologie et géophysique de l'environnement ( LGGE ), Observatoire des Sciences de l'Univers de Grenoble ( OSUG ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ) -Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ) -Centre National de la Recherche Scientifique ( CNRS ), Génétique du cancer et des maladies neuropsychiatriques ( GMFC ), Université de Rouen Normandie ( UNIROUEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ), Institute of Geophysics and Planetary Physics, Department of Physics, Stockholm University ( Department of Physics, Stockholm University ), Université de Lille, Sciences Humaines et Sociales, Département Recherches Subatomiques ( DRS-IPHC ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique ( CNRS ), Key Laboratory of Molecular Virology & Immunology ( LMVI ), Réseau International des Instituts Pasteur ( RIIP ) -Institut Pasteur de Shanghai - Académie des Sciences de Chine, Laboratoire Chrono-environnement ( LCE ), Université Bourgogne Franche-Comté ( UBFC ) -Université de Franche-Comté ( UFC ) -Centre National de la Recherche Scientifique ( CNRS ), Christian-Albrechts-Universität zu Kiel ( CAU ), Laboratoire de Physique des Plasmas ( LPP ), Université Paris-Sud - Paris 11 ( UP11 ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Observatoire de Paris-École polytechnique ( X ) -Sorbonne Universités-PSL Research University ( PSL ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Space and Astrophysics, Institute of Plasma Physics, Association EURATOM ( IPP PRAGUE ), Univ. Grenoble Alpes, LCIS, York Plasma Institute ( YPI ), University of Wisconsin-Madison [Madison], Association EURATOM-CEA ( CEA/DSM/DRFC ), Euratom/UKEAE Fusion Association ( JET ), European Synchrotron Radiation Facility ( ESRF ), Politecnico di Torino [Torino] ( Polito ), Instituto Andaluz de Geofísica, Universidad de Granada, Université du Québec, Etablissement français du sang [Besançon] ( EFS ), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), D'Arcangelo, O., Max Planck Institute for Plasma Physics, Swiss Federal Institute of Technology Lausanne, VTT Technical Research Centre of Finland, National Research Council of Italy, Czech Academy of Sciences, Instituto Superior Tecnico Lisboa, CEA, University of Naples Federico II, University of Cagliari, University of Naples Parthenope, Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile, National Technical University of Athens, CIEMAT, University of Oxford, EUROfusion Programme Management Unit, Wigner Research Centre for Physics, University of Strathclyde, Jülich Research Centre, Université de Lorraine, CNRS, University of Rome Tor Vergata, Uppsala University, University of Warwick, Soltan Institute for Nuclear Studies, Dutch Institute for Fundamental Energy Research, University of Innsbruck, University of Split, University of York, Budapest University of Technology and Economics, KTH Royal Institute of Technology, Barcelona Supercomputing Center, University of Seville, Karlsruhe Institute of Technology, University of Milan - Bicocca, Université Paris-Sud, Graz University of Technology, Royal Military Academy, Ghent University, Aristotle University of Thessaloniki, Technical University of Denmark, Department of Applied Physics, Vienna University of Technology, University of Helsinki, Foundation for Research and Technology-Hellas, Université Grenoble Alpes, Forschungszentrum Jülich, Durham University, Polytechnic University of Turin, University of Cassino and Southern Lazio, University College Cork, National Institute for Laser, Plasma and Radiation Physics, Chalmers University of Technology, Aalto-yliopisto, Aalto University, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Andrãbe, Y., Bilkovã¡, P., Bã¶hm, P., Brã©mond, S., Calabrã², G., Castejã³n, F., D'Inca, R., Doriä , V., Erdã¶s, B., Fã©vrier, O., Fridstrã¶m, R., Gaå azka, K., Gardarein, J. -. L., Gleason González, C., Hã¶lzl, M., Honorã©, C., Horã¡ä ek, J., Horvã¡th, L., Kã¡lvin, S., Lazã¡nyi, N., Lefã©vre, L., Mayoral, M. -. L., Moret, J. -. M., Mã¼ller, H. W., Odsträ il, T., O'Mullane, M. G., Papå ok, R., Pehkonen, S. -. P., Pã¶lã¶skei, P., Pã³r, G., Pã¼tterich, T., Rattã¡, G. A., Rã©fy, D., Å esniä , S., Å uå¡njara, A., Tã¡l, B., Tophj, L., Van Den Brand, H., Vondrã¡ä ek, P., Zagã³rski, R., and Department of Physics

Subjects
Tokamak, Asdex upgrade, 01 natural sciences, 010305 fluids & plasmas, law.invention, heat loads, Divertor, ASDEX Upgrade, ASDEX upgrade, law, Fusió nuclear, Magnetoplasma, ComputingMilieux_MISCELLANEOUS, Physics, [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, Plasma turbulence, alternative divertor concept, Condensed Matter Physics, Fusion, Plasma and Space Physics, edge localised mode, Thermal load, edge localised modes, Localised, TCV, [ SPI.PLASMA ] Engineering Sciences [physics]/Plasmas, PARTICLE, divertor, MAST, alternative divertor concepts, Nuclear and High Energy Physics, Materials science, Plasma (Gasos ionitzats), 114 Physical sciences, [SPI.AUTO]Engineering Sciences [physics]/Automatic, Fusion, plasma och rymdfysik, Fusion reactor divertors, Settore ING-INF/04 - Automatica, [ SPI.AUTO ] Engineering Sciences [physics]/Automatic, 0103 physical sciences, heat load, ddc:530, Aerospace engineering, 010306 general physics, Nuclear and High Energy Physic, Plasma (Ionized gases), Física [Àrees temàtiques de la UPC], business.industry, Mast, Física, Nuclear energy, Plasma, SCRAPE-OFF LAYER, Plasma edge, Alternative divertor concepts, DENSITY, Sols, Nuclear fusion, Energia nuclear, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

Integrating the plasma core performance with an edge and scrape-off layer (SOL) that leads to tolerable heat and particle loads on the wall is a major challenge. The new European medium size tokamak task force (EU-MST) coordinates research on ASDEX Upgrade (AUG), MAST and TCV. This multi-machine approach within EU-MST, covering a wide parameter range, is instrumental to progress in the field, as ITER and DEMO core/pedestal and SOL parameters are not achievable simultaneously in present day devices. A two prong approach is adopted. On the one hand, scenarios with tolerable transient heat and particle loads, including active edge localised mode (ELM) control are developed. On the other hand, divertor solutions including advanced magnetic configurations are studied. Considerable progress has been made on both approaches, in particular in the fields of: ELM control with resonant magnetic perturbations (RMP), small ELM regimes, detachment onset and control, as well as filamentary scrape-off-layer transport. For example full ELM suppression has now been achieved on AUG at low collisionality with n = 2 RMP maintaining good confinement HH(98,y2)≈0.95. Advances have been made with respect to detachment onset and control. Studies in advanced divertor configurations (Snowflake, Super-X and X-point target divertor) shed new light on SOL physics. Cross field filamentary transport has been characterised in a wide parameter regime on AUG, MAST and TCV progressing the theoretical and experimental understanding crucial for predicting first wall loads in ITER and DEMO. Conditions in the SOL also play a crucial role for ELM stability and access to small ELM regimes. Integrating the plasma core performance with an edge and scrape-off layer (SOL) that leads to tolerable heat and particle loads on the wall is a major challenge. The new European medium size tokamak task force (EU-MST) coordinates research on ASDEX Upgrade (AUG), MAST and TCV. This multi-machine approach within EU-MST, covering a wide parameter range, is instrumental to progress in the field, as ITER and DEMO core/pedestal and SOL parameters are not achievable simultaneously in present day devices. A two prong approach is adopted. On the one hand, scenarios with tolerable transient heat and particle loads, including active edge localised mode (ELM) control are developed. On the other hand, divertor solutions including advanced magnetic configurations are studied. Considerable progress has been made on both approaches, in particular in the fields of: ELM control with resonant magnetic perturbations (RMP), small ELM regimes, detachment onset and control, as well as filamentary scrape-off-layer transport. For example full ELM suppression has now been achieved on AUG at low collisionality with n = 2 RMP maintaining good confinement H-H(98,H-y2) approximate to 0.95. Advances have been made with respect to detachment onset and control. Studies in advanced divertor configurations (Snowflake, Super-X and X-point target divertor) shed new light on SOL physics. Cross field filamentary transport has been characterised in a wide parameter regime on AUG, MAST and TCV progressing the theoretical and experimental understanding crucial for predicting first wall loads in ITER and DEMO. Conditions in the SOL also play a crucial role for ELM stability and access to small ELM regimes.

Published
2017
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6. SOL Transport and Detachment in Alternative Divertor Configurations in TCV L_and H_Mode Plasmas

Author

Theiler C., Boedo J.A., Duval B.P., Fedorczak N., Février O., Fil A., Gallo A., Harrison J.R., Innocente P., Labit B., Linehan B., Lipschultz B., Maurizio R., Mumgaard B., De Oliveira H., Reimerdes H., Sheikh U., Thornton A.J., Tsui C.K., Verhaegh K., Vianello N., Vijvers W.A.J., Wensing M., the TCV Team, and the EUROfusion MST1 Team

Subjects
SOL, scrape-off layer, H-Mode plasmas, TCV, fusion plasma divertor, Tokamac Configuration Variable
Abstract

The effect of magnetic geometry on scrape-off layer (SOL) transport and detachment behaviour is investigated on the TCV tokamak with the goal of assessing the potential of alternative divertor geometries and for the validation of theoretical models. L-mode experiments reveal that increasing connection length and hence divertor volume by either increasing poloidal flux expansion or divertor leg length have different effects on the boundary plasma. In attached conditions, the SOL heat flux width q inferred from target infrared thermography measurements is weakly dependent on poloidal flux expansion but increases approximately with the square root of the divertor leg length. The divertor spreading factor S shows no clear trend with leg length but decreases with flux expansion. TOKAM3X turbulence simulations of the leg length scan are in qualitative agreement with the experiment and can explain observations by a strongly asymmetric (ballooning) transport at and below the X-point. Evidence for increased transport in the region of low poloidal field is obtained in the Snowflake minus geometry. The presence of an additional X-point in the low-field side SOL increases the effective SOL width by approximately a factor two. Increasing flux expansion and leg length both result in enhanced divertor radiation levels, with the effect being much larger in the latter case. This behaviour, together with the observed trend in q, is consistent with a substantial drop in the density threshold for divertor detachment with increasing leg length and a weak variation with flux expansion. Novel spectroscopic techniques reveal that the drop in target ion current and access to detachment is caused by a reduction of the divertor ionization source due to power starvation, while volume recombination is only a small contributor. This interpretation is confirmed by SOLPS modelling. TCV alternative divertor studies are being extended to neutral beam heated H-mode plasmas. The H-mode power threshold is found to vary weakly between standard, X-, and Super- X geometries. In all cases, ELMy H-mode is obtained at intermediate current, while the discharges are ELM-free at high current. Signs of detachment have so far only been observed in the latter case. Ongoing experiments further investigate H-mode detachment in these plasmas and will be extended to Snowflake configurations.

Published
2018

7. New insights into the physics and dynamics of divertor ion current loss during divertor detachment in TCV

Author

Verhaegh K., Lipschultz B., Duval B.P., Février O., Theiler C., Fil A., Harrison J.R., Labit B., Marini C., Maurizio R., De Oliveira H., Reimerdes H., Sheikh U., Tsui C.K., Vianello N., Vijvers W., Wensing M., the TCV team, and the EuroFusion MST1 team

Subjects
TCV, fusion plasma divertor, Tokamac Configuration Variable
Abstract

Detachment is predicted to be of paramount importance in handling the power exhaust for future fusion devices, such as ITER. However, a direct experimental quantification of the role and spatial profile of the various atomic processes controlling the loss of divertor ion current during detachment has, until now, not been available due to lack of ionisation measurements. The physics of the target ion current loss, a defining and important feature of detachment, is studied in TCV using density ramp, or N2 seeded, L-mode discharges with various plasma currents. Novel spectroscopic analysis techniques utilising the hydrogen Balmer series have been developed to infer the ionisation source magnitude and distribution. This provides, together with the ion sink in the plasma (recombination), electron density and divertor power balance measurements, a detailed picture of particle and power balance along the outer divertor leg. The results for a conventional single-null topology show the divertor ion source tracks the ion target flux both in magnitude and in time: both the ion target current and ion source decrease together at detachment. Surprisingly, the volumetric recombination ion sink - commonly thought to be the primary detachment ion loss mechanism - is only a small (sometimes negligible) portion of the ion current losses. New evidence from TCV shows the driver of the divertor ion source decrease is a decrease in power flowing into the ionisation region combined with an increase in the energy required per ionisation - essentially 'starving' the ionisation region of power. SOLPS modelling of a TCV density ramp discharge with a conventional divertor configuration has reproduced the general characteristics of the ion source reduction. 'Power starvation' of the ionization source, therefore, appears to be central to loss of divertor target ion current. The divertor plasma sink for ions, recombination, is maximised at the highest divertor densities, which are achieved at the highest core densities. Nitrogen seeding enables detachment by 'power starving' the ionisation region at lower core densities and hence lower recombination sink. The ratio between the recombination ion sink and the ion target flux increases when poloidal flux expansion is increased (x-divertor) under constant core conditions. Understanding these changes may be key to understanding the role of magnetic geometry on detachment and possibly the detachment process itself.

Published
2018

8. The effect of the secondary x-point on the Scrape-Off Layer transport in the TCV Snowflake Minus divertor

Author

Maurizio R., Duval B.P., Labit B., Reimerdes H., Theiler C., Tsui C.K., Boedo J., De Oliveira H., Février O., Sheikh U., Spolaore M., Verhaegh K., Vianello N., Wensing M., the TCV team, and the EUROfusion MST1 team

Subjects
Scrape-Off Layer transport, Tokamak Configuration Variable, TCV
Abstract

TCV experiments show evidence that the cross-field transport in the low-field side (LFS) Scrape-Off Layer (SOL) of the conventional Single-Null (SN) configuration is strongly enhanced when placing a secondary x-point in the common flux region of the primary separatrix. Such a magnetic configuration is known as the Snowflake Minus (SF-) [1]. The exhaust properties of the SF- configuration were investigated on TCV in Ohmically heated, L-mode attached plasmas with a range of x-point separations, magnetic field directions and locations of the secondary x-point (low-field side, LFS, or high-field side, HFS, SOL). The target heat flux profiles at all strike points are simultaneously measured with an Infrared Thermography (IR) system [2] and the main SOL plasma kinetic profiles with a fast reciprocating probe (RCP) [3]. The measured power repartition between the two branches of the SOL diverted by the secondary x-point yields an effective heat flux width ?q,u eff for the SOL. It is found that the LFS SOL cross-field transport is strongly enhanced by the presence of the secondary x-point, for both magnetic field directions, with ?q,u eff being a factor three larger than the value measured by the RCP at the outer mid-plane or by IR at the outer target of a comparable SN. The RCP inspection of the low poloidal field region reveals that the profiles of SOL density and ion saturation current develop steep gradients in proximity of the secondary separatrix, while the profiles flatten in between the two separatrixes, compared to the SN divertor. In contrast, the cross-field transport in the HFS SOL is not significantly affected by the presence of the secondary x-point. However, similar to comparable SN discharges, it is sensitive to the magnetic field direction, with a broader SOL width for reversed field. Placing the secondary x-point on one side of the SOL also affects the power balance between inner and outer divertor. This is interpreted as the effect of changed parallel transport in the SOL due to the changes in the geometry of the flux tubes caused by the presence of the secondary x-point, and was already seen in fluid calculations assuming constant cross-field transport coefficients.

Published
2018

9. Detachment in alternative divertor geometries on TCV

Author

Theiler C., Duval B., Février O., Harrison J., Innocente P., Labit B., Lipschultz B., Maurizio R., Reimerdes H., Sheikh U., Tsui C., Verhaegh K., Vijvers W.A.J., TCV team, and EUROfusion MST1 team

Subjects
Tokamak Configuration Variable, divertor geometries, TCV
Abstract

The dependence of divertor detachment on magnetic geometry is explored on the TCV tokamak, with the goal of improving our basic understanding of this process and optimizing the divertor geometry for a power plant. In the experiments, connection length from the midplane to the outer target is varied by up to a factor two by either modifying the poloidal flux expansion or the divertor leg length. The outer target major radius, and hence total flux expansion, is scanned continuously with a variation of 70% to explore the properties of a Super-X divertor. The effect of an additional X-point close to the primary one (Snowflake divertor) and close to the outer target (X-point target divertor) is also assessed [1-2]. To study detachment across this large parameter space, experiments to date have mainly focused on Ohmic density ramps and on private-flux-region nitrogen seeding [3-4]. We find that although increasing the connection length through poloidal flux expansion has little effect on the density threshold for detachment of the outer leg, it allows access to a higher degree of detachment and provides improved control of the peak radiatio location. If, instead, the connection length is increased by increasing the divertor leg length, the detachment threshold is reduced by as much as 25%. Contrary to expectations from analytical and advanced numerical calculations, total flux expansion is found to have very little effect on the detachment behavior [1]. Additional X-points in the scrape-off layer can result in a zone of enhanced radiation around the secondary X-point and fully detach the part of the outer leg that sits inside the secondary X-point. This enhanced radiation region is particularly pronounced in the Snowflake geometry with sufficient nitrogen seeding [2], consistent with predictions from EMC3-Eirene calculations [5].

Published
2017

10. Overview of the TCV tokamak program: scientific progress and facility upgrades

Author

S. Mastrostefano, J.-Ph. Hogge, S. Nowak, W. Bin, Bogdan Hnat, Nuno Cruz, S. Allan, T. C. Blanken, Cristian Galperti, H. F. Meyer, M. Faitsch, Stefano Coda, Y. Andrebe, D. Rittich, E. Maljaars, Laust Emil Hjerrild Tophøj, C. Ham, P. Molina Cabrera, Alessandro Pau, Jonathan Graves, D. Douai, C.K. Tsui, H. Weisen, J-M Moret, Marco Gobbin, M. Nocente, David Moulton, Heinz Isliker, F. Sciortino, S. Vartanian, M. Koubiti, P. A. Schneider, V. P. Loschiavo, R. M. McDermott, E. Alessi, I Miron, Yann Camenen, F. Braunmüller, Duccio Testa, T. Odstrcil, J. Juul Rasmussen, J. Horacek, M. Sertoli, G. De Tommasi, Geert Verdoolaege, Patrick Maget, Gustavo Granucci, Timothy P. Robinson, M. Preynas, Cyrille Honoré, Benedikt Geiger, Paolo Innocente, C. Tsironis, A. Jardin, J.A. Boedo, Izaskun Garrido, M. Gospodarczyk, M. G. Dunne, F. Carpanese, M. Kong, Ondrej Ficker, N. Vianello, V. Igochine, P. Zestanakis, V. Pericoli Ridolfini, R. Scannell, T. Lunt, A. Malygin, J. Ahn, M. Bernert, G. Calabrò, Theophilos Pisokas, M. Wischmeier, Piero Martin, Fulvio Militello, B. Lomanowski, Benoit Labit, Giuseppe Gorini, Daniele Carnevale, A. Czarnecka, Faa Federico Felici, F. Saint-Laurent, B. Sieglin, X. Llobet, Patrick Tamain, M. Mavridis, G. Ciraolo, Ambrogio Fasoli, J. Sinha, F. Causa, Ch. Schlatter, J. Decker, Raffaele Albanese, P. Blanchard, F. Bouquey, C. Angioni, G. De Masi, R. McAdams, A. Moro, S. Garavaglia, Hugo Bufferand, Antoine Merle, O. Chellai, Torsten Stange, Laure Vermare, Loukas Vlahos, W. A. J. Vijvers, G. Pautasso, Olivier Février, N. A. Kirneva, H. Reimerdes, Timothy Goodman, Nicolas Fedorczak, Bruce Lipschultz, E. Lazzaro, C. Piron, Z. Huang, J. Kamleitner, James Harrison, Fabio Riva, Lorenzo Frassinetti, Paolo Ricci, Y. R. Martin, Anders Nielsen, B. Esposito, Jonathan Citrin, Antti Hakola, M. Reich, I. T. Chapman, Kevin Verhaegh, C. Marini, H.B. Le, V. Naulin, B. P. Duval, M. Silva, A. Gallo, J. Hawke, A. Krämer-Flecken, D. Hogeweij, N. Krawczyk, Roberto Maurizio, Ivo Furno, Marco Ariola, Christian Theiler, A. N. Karpushov, Jernej Kovacic, M. N. A. Beurskens, A. Uccello, M. Fontana, C. J. Rapson, Tom Wauters, Christian Hopf, C. Ionita Schrittwieser, S. Saarelma, T. Eich, T. Stoltzfus-Dueck, S. Fietz, P. Piovesan, R. Jacquier, D. Choi, H. Anand, Nick Walkden, Gergely Papp, F. Nespoli, D. L. Keeling, B. S. Schneider, Sergio Galeani, G. Ramogida, S. Elmore, E. Giovannozzi, Stefano Alberti, Rémy Nouailletas, O. Kudlacek, R. Guirlet, R. Papřok, Matteo Zuin, T. Bolzonella, F. Crisanti, D. Mazon, U. A. Sheikh, Pascale Hennequin, R. Cesario, A.J. Thornton, S. Costea, P. Buratti, C. Cianfarani, R. Schrittwieser, A. Teplukhina, N.M.T. Vu, Laurie Porte, M. Spolaore, Carlo Sozzi, Minh Quang Tran, M. Maraschek, Olivier Sauter, C. Reux, G. Anastassiou, Ramogida, G., Giovannozzi, E., Esposito, B., Cianfarani, C., Cesario, R., Causa, F., Calabró, G., Buratti, P., Max-Planck-Institut für Plasmaphysik [Garching] (IPP), EURATOM/CCFE Fusion Association, Culham Science Centre [Abingdon], Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Physique des interactions ioniques et moléculaires (PIIM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences et Ingénierie Chimiques (ISIC), Ecole Polytechnique Fédérale de Lausanne (EPFL), Associazone EURATOM ENEA sulla Fusione, EURATOM, Sygen International Plc, Laboratoire de Physique des Plasmas (LPP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institute of Plasma Physics, Association Euratom/IPP.CR (IPP PRAGUE), Czech Academy of Sciences [Prague] (CAS), York Plasma Institute (YPI), University of York [York, UK], Association EURATOM-CEA (CEA/DSM/DRFC), Association EURATOM-Risø National Laboratory, Technical University of Denmark [Lyngby] (DTU), Plateforme RX, UFR Chimie, Université Paris Diderot - Paris 7 (UPD7), Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Consiglio Nazionale delle Ricerche [Roma] (CNR), EUROfusion MST1 Team, Coda, S., Ahn, J., Albanese, Raffaele, Alberti, S., Alessi, E., Allan, S., Anand, H., Anastassiou, G., Andrèbe, Y., Angioni, C., Ariola, M., Bernert, M., Beurskens, M., Bin, W., Blanchard, P., Blanken, T. C., Boedo, J. A., Bolzonella, T., Bouquey, F., Braunmüller, F. H., Bufferand, H., Camenen, Y., Carnevale, D., Carpanese, F., Chapman, I. T., Chellai, O., Choi, D., Ciraolo, G., Citrin, J., Costea, S., Crisanti, F., Cruz, N., Czarnecka, A., Decker, J., De Masi, G., DE TOMMASI, Gianmaria, Douai, D., Dunne, M., Duval, B. P., Eich, T., Elmore, S., Faitsch, M., Fasoli, A., Fedorczak, N., Felici, F., Février, O., Ficker, O., Fietz, S., Fontana, M., Frassinetti, L., Furno, I., Galeani, S., Gallo, A., Galperti, C., Garavaglia, S., Garrido, I., Geiger, B., Gobbin, M., Goodman, T. P., Gorini, G., Gospodarczyk, M., Granucci, G., Graves, J. P., Guirlet, R., Hakola, A., Ham, C., Harrison, J., Hawke, J., Hennequin, P., Hnat, B., Hogeweij, D., Hogge, J. P. h., Honoré, C., Hopf, C., Horáček, J., Huang, Z., Igochine, V., Innocente, P., Ionita Schrittwieser, C., Isliker, H., Jacquier, R., Jardin, A., Kamleitner, J., Karpushov, A., Keeling, D. L., Kirneva, N., Kong, M., Koubiti, M., Kovacic, J., Krämer Flecken, A., Krawczyk, N., Kudlacek, O., Labit, B., Lazzaro, E., Le, H. B., Lipschultz, B., Llobet, X., Lomanowski, B., Loschiavo, VINCENZO PAOLO, Lunt, T., Maget, P., Maljaars, E., Malygin, A., Maraschek, M., Marini, C., Martin, P., Martin, Y., Mastrostefano, S., Maurizio, R., Mavridis, M., Mazon, D., Mcadams, R., Mcdermott, R., Merle, A., Meyer, H., Militello, F., Miron, I. G., Molina Cabrera, P. A., Moret, J. M., Moro, A., Moulton, D., Naulin, V., Nespoli, F., Nielsen, A. H., Nocente, M., Nouailletas, R., Nowak, S., Odstrčil, T., Papp, G., Papřok, R., Pau, A., Pautasso, G., Pericoli Ridolfini, V., Piovesan, P., Piron, C., Pisokas, T., Porte, L., Preynas, M., Rapson, C., Juul Rasmussen, J., Reich, M., Reimerdes, H., Reux, C., Ricci, P., Rittich, D., Riva, F., Robinson, T., Saarelma, S., Saint Laurent, F., Sauter, O., Scannell, R., Schlatter, C. h., Schneider, B., Schneider, P., Schrittwieser, R., Sciortino, F., Sertoli, M., Sheikh, U., Sieglin, B., Silva, M., Sinha, J., Sozzi, C., Spolaore, M., Stange, T., Stoltzfus Dueck, T., Tamain, P., Teplukhina, A., Testa, D., Theiler, C., Thornton, A., Tophøj, L., Tran, M. Q., Tsironis, C., Tsui, C., Uccello, A., Vartanian, S., Verdoolaege, G., Verhaegh, K., Vermare, L., Vianello, N., Vijvers, W. A. J., Vlahos, L., Vu, N. M. T., Walkden, N., Wauters, T., Weisen, H., Wischmeier, M., Zestanakis, P., Zuin, M., Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Danmarks Tekniske Universitet = Technical University of Denmark (DTU), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Coda, S, Ahn, J, Albanese, R, Alberti, S, Alessi, E, Allan, S, Anand, H, Anastassiou, G, Andrãbe, Y, Angioni, C, Ariola, M, Bernert, M, Beurskens, M, Bin, W, Blanchard, P, Blanken, T, Boedo, J, Bolzonella, T, Bouquey, F, Braunmã¼ller, F, Bufferand, H, Buratti, P, Calabrã³, G, Camenen, Y, Carnevale, D, Carpanese, F, Causa, F, Cesario, R, Chapman, I, Chellai, O, Choi, D, Cianfarani, C, Ciraolo, G, Citrin, J, Costea, S, Crisanti, F, Cruz, N, Czarnecka, A, Decker, J, De Masi, G, De Tommasi, G, Douai, D, Dunne, M, Duval, B, Eich, T, Elmore, S, Esposito, B, Faitsch, M, Fasoli, A, Fedorczak, N, Felici, F, Fã©vrier, O, Ficker, O, Fietz, S, Fontana, M, Frassinetti, L, Furno, I, Galeani, S, Gallo, A, Galperti, C, Garavaglia, S, Garrido, I, Geiger, B, Giovannozzi, E, Gobbin, M, Goodman, T, Gorini, G, Gospodarczyk, M, Granucci, G, Graves, J, Guirlet, R, Hakola, A, Ham, C, Harrison, J, Hawke, J, Hennequin, P, Hnat, B, Hogeweij, D, Hogge, J, Honorã©, C, Hopf, C, Horã¡ä ek, J, Huang, Z, Igochine, V, Innocente, P, Ionita Schrittwieser, C, Isliker, H, Jacquier, R, Jardin, A, Kamleitner, J, Karpushov, A, Keeling, D, Kirneva, N, Kong, M, Koubiti, M, Kovacic, J, Krämer-Flecken, A, Krawczyk, N, Kudlacek, O, Labit, B, Lazzaro, E, Le, H, Lipschultz, B, Llobet, X, Lomanowski, B, Loschiavo, V, Lunt, T, Maget, P, Maljaars, E, Malygin, A, Maraschek, M, Marini, C, Martin, P, Martin, Y, Mastrostefano, S, Maurizio, R, Mavridis, M, Mazon, D, Mcadams, R, Mcdermott, R, Merle, A, Meyer, H, Militello, F, Miron, I, Molina Cabrera, P, Moret, J, Moro, A, Moulton, D, Naulin, V, Nespoli, F, Nielsen, A, Nocente, M, Nouailletas, R, Nowak, S, Odsträ il, T, Papp, G, PapÅ™ok, R, Pau, A, Pautasso, G, Pericoli Ridolfini, V, Piovesan, P, Piron, C, Pisokas, T, Porte, L, Preynas, M, Ramogida, G, Rapson, C, Juul Rasmussen, J, Reich, M, Reimerdes, H, Reux, C, Ricci, P, Rittich, D, Riva, F, Robinson, T, Saarelma, S, Saint-Laurent, F, Sauter, O, Scannell, R, Schlatter, C, Schneider, B, Schneider, P, Schrittwieser, R, Sciortino, F, Sertoli, M, Sheikh, U, Sieglin, B, Silva, M, Sinha, J, Sozzi, C, Spolaore, M, Stange, T, Stoltzfus-Dueck, T, Tamain, P, Teplukhina, A, Testa, D, Theiler, C, Thornton, A, Tophã¸j, L, Tran, M, Tsironis, C, Tsui, C, Uccello, A, Vartanian, S, Verdoolaege, G, Verhaegh, K, Vermare, L, Vianello, N, Vijvers, W, Vlahos, L, Vu, N, Walkden, N, Wauters, T, Weisen, H, Wischmeier, M, Zestanakis, P, and Zuin, M

Subjects
Nuclear and High Energy Physics, Tokamak, Technology and Engineering, Nuclear engineering, Overview, overview, 01 natural sciences, 010305 fluids & plasmas, law.invention, Settore ING-INF/04 - Automatica, law, Control theory, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, 010306 general physics, tokamak, Nuclear and High Energy Physic, Physics, Toroid, Divertor, Magnetic confinement fusion, Plasma, Condensed Matter Physics, TCV, TRANSPORT, Magnetohydrodynamics, Beam (structure)
Abstract

a quiescent runaway beam carrying the entire electrical current appears to develop in some cases. Developments in plasma control have benefited from progress in individual controller design and have evolved steadily towards controller integration, mostly within an environment supervised by a tokamak profile control simulator. TCV has demonstrated effective wall conditioning with ECRH in He in support of the preparations for JT-60SA operation. © 2017 Ecole Polytechnique Federale de Lausanne., in particular, the double decay length in L-mode limited plasmas was found to be replaced by a single length at high SOL resistivity. Experiments on disruption mitigation by massive gas injection and electron-cyclotron resonance heating (ECRH) have begun in earnest, in parallel with studies of runaway electron generation and control, in both stable and disruptive conditions, The TCV tokamak is augmenting its unique historical capabilities (strong shaping, strong electron heating) with ion heating, additional electron heating compatible with high densities, and variable divertor geometry, in a multifaceted upgrade program designed to broaden its operational range without sacrificing its fundamental flexibility. The TCV program is rooted in a three-pronged approach aimed at ITER support, explorations towards DEMO, and fundamental research. A 1 MW, tangential neutral beam injector (NBI) was recently installed and promptly extended the TCV parameter range, with record ion temperatures and toroidal rotation velocities and measurable neutral-beam current drive. ITER-relevant scenario development has received particular attention, with strategies aimed at maximizing performance through optimized discharge trajectories to avoid MHD instabilities, such as peeling-ballooning and neoclassical tearing modes. Experiments on exhaust physics have focused particularly on detachment, a necessary step to a DEMO reactor, in a comprehensive set of conventional and advanced divertor concepts. The specific theoretical prediction of an enhanced radiation region between the two X-points in the low-field-side snowflake-minus configuration was experimentally confirmed. Fundamental investigations of the power decay length in the scrape-off layer (SOL) are progressing rapidly, again in widely varying configurations and in both D and He plasmas

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