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1. Completion of the Commissioning of the EDIPO Test Facility

Author

Alfredo Portone, Pierluigi Bruzzone, Rainer Wesche, Boris Stepanov, K. Sedlak, and S. March

Subjects
Cryostat, high magnetic field, Test facility, Materials science, Liquid helium, Nuclear engineering, Field homogeneity, test facility, Condensed Matter Physics, High-current superconducting cables, 01 natural sciences, 010305 fluids & plasmas, Electronic, Optical and Magnetic Materials, law.invention, Conductor, Nuclear magnetic resonance, law, Electromagnetic coil, 0103 physical sciences, Heat exchanger, Electrical and Electronic Engineering, 010306 general physics, Transformer
Abstract

The main coils of the new European DIPOle (EDIPO) test facility, which is able to provide a background magnetic field up to 12.35 T, were commissioned at the Center for Research in Plasma Physics in July 2013. A field homogeneity of +/-1% was achieved over a 900-mm length, as compared to SULTAN's 10.9 T over 425 mm. To complete the commissioning of the test facility, the new superconducting transformer has been operated in 2015, and a high-current NbTi sample, which was earlier tested in the SULTAN test facility, has been tested in EDIPO under the same conditions as in SULTAN to benchmark the results. During the initial commissioning of the 100-kA transformer in 2013, the primary coil was found to be insufficiently cooled due to the debonding of the primary winding from its former that also served as the liquid helium cryostat. The NbTi primary coil was therefore modified to be in direct contact with liquid helium. At the next attempt of commissioning, in March 2014, a mechanical failure due to the imperfect alignment of the primary and secondary windings caused major damage. A replacement primary coil, which was wound in Summer 2014, was used in the third commissioning campaign in November 2014, but it failed due to the poor impregnation of the NbTi winding. Eventually, the original primary winding was repaired and commissioned in April 2015. The commissioning included a calibration of the current meter for the secondary winding and the high-current test, i.e., up to 95 kA at various background fields, of the “Trasek” conductor sample, which is a rectangular cable-in-conduit conductor made of 324 SnAg-coated NbTi strands. An excellent agreement was found between the results obtained from the two facilities. The sample holder unit is also equipped with a high-temperature superconducting (HTS) adapter and a counterflow heat exchanger to allow testing in EDIPO of HTS high-current samples over a broad range of operating temperatures, from 4.5 up to 50 K.

Published
2016
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2. Performance Analysis of Mass-Produced Nb3Sn Conductor for Central Solenoid in ITER

Author

Kunihiro Matsui, Suwa Tomone, Boris Stepanov, Hideki Kajitani, Tsuyoshi Takano, Takaaki Isono, Y. Uno, Masahide Iguchi, K. Shibutani, Kiyoshi Okuno, Norikiyo Koizumi, M. Oshikiri, Hidemasa Ozeki, Tsutomu Hemmi, Fumiaki Tsutsumi, Pierluigi Bruzzone, Y. Nabara, K. Sedlak, Y. Takahashi, Takeru Sakurai, Yukinobu Murakami, and Yoshihiko Nunoya

Subjects
0301 basic medicine, Materials science, Solenoid, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, Conductor, 03 medical and health sciences, 030104 developmental biology, Nuclear magnetic resonance, Current sharing, 0103 physical sciences, Thermal, Electrical and Electronic Engineering, Composite material, 010306 general physics, Electrical conductor
Abstract

The performance of two mass-produced Nb3Sn conductors for the ITER central solenoids was tested for the first timmass-produced Nb3Sn conductorse. One was cut from the forward end of an 80-m-long conductor, and the other was cut from the forward end of a 918-m-long conductor. The fifth-stage twist pitches of these conductors were lengthened by approximately 16% during cable insertion and compaction with conduit. The current sharing temperatures Tcs were measured over 20 000 electromagnetic cycles, including four thermal cycles between 4.2 K and room temperature. The Tcs of the former conductor increased and became almost constant through the cycling. In contrast, Tcs of the latter conductor not only increased but also decreased slightly against cycling. The Tcs decline rate after 10002 cycles was -4.50 × 10-6 K/cycle. If this rate is assumed to continue after 20000 cycles, Tcs would decrease by -0.27 K over 60000 cycles. Even so, Tcs is higher than an acceptance criterion of 6.5 K at 60 000 cycles. The ac losses Q of both conductors at a current of 0 kA were almost the same as or slightly lower than Q of a short sample conductor whose fifth-stage twist pitch was not lengthen. On each conductor, Q at 40 kA was approximately 10% higher than that at 0 kA; thus, the effect of the transport current on Q was not large.

Published
2016
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3. Thermal-hydraulic analysis of the improved LTS conductor design concepts for the DEMO TF coil

Author

K. Sedlak and Monika Lewandowska

Subjects
Engineering, Maximum temperature, business.industry, Mechanical engineering, 01 natural sciences, 010305 fluids & plasmas, Conductor, Thermal hydraulics, Electromagnetic coil, 0103 physical sciences, Electrical and Electronic Engineering, 010306 general physics, business, Maximum pressure
Abstract

The improved design concepts for the LTS TF coil system of DEMO have been proposed in 2013 by EPFL-CRPP PSI Villigen and ENEA Frascati. The present study is focused on the thermal-hydraulic analysis of the conductor designs, which includes: hydraulic analysis, heat removal analysis and assessment of the maximum temperature and the maximum pressure in each conductor during quench. Streszczenie. W 2013 r. zespoly z EPFL-CRPP i ENEA Frascati opracowaly udoskonalone koncepcje projektowe kabli dla poszczegolnych warstw cewki TF tokamaka DEMO. W pracy przedstawiono analize cieplno - przeplywową projektow kabli obejmującą: analize hydrauliczną, oszacowanie zdolności usuwania ciepla oraz oszacowanie maksymalnej temperatury oraz maksymalnego ciśnienia podczas utraty stanu nadprzewodzenia.. (Analiza cieplno-przeplywowa udoskonalonego projektu kabli nadprzewodnikowych dla cewki TF tokamaka DEMO).

Published
2016
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4. Performance of ITER Correction Busbar Conductor Samples CBCN2 and CBCN3

Author

Bo Liu, Yu Wu, Arnaud Devred, Pierluigi Bruzzone, Min Yu, Jinggang Qin, Boris Stepanov, Huajun Liu, Fang Liu, Feng Long, and K. Sedlak

Subjects
maximum operating field, Materials science, Field (physics), busbar, NbTi, Busbar, Ac field, Phase (waves), Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Electronic, Optical and Magnetic Materials, Conductor, electromagnetic, ITER, Current sharing, 0103 physical sciences, conductor samples, Production (computer science), Electrical and Electronic Engineering, Atomic physics, 010306 general physics, Electrical conductor
Abstract

The correction busbar (CB) conductors for the ITER project are being produced in China. The second China CB conductor sample (CBCN2, Phase II of conductor testing) and the third CB conductor sample (CBCN3, Phase III testing) were made of the WST NbTi strands, cabled by Changtong, jacketed at ASIPP, and tested in the SULTAN facility. The current sharing $(T_\mathrm{cs})$ test results show that the conductor sections of CBCN2 and CBCN3 have high $T_\mathrm{cs}$ performance. Using the electrical method, the $T_\mathrm{cs}$ of both CBCN2 and CBCN3 samples was 7.50 K at 10 kA/2.9 T (maximum operating field) before and after electromagnetic loading. AC loss measurement was performed before any electromagnetic loading of the sample, and the measurements were repeated after 1000 or 2000 cyclic loads. The AC loss measurements were performed at 2-T background field, without transport current. The ac loss of the CBCN2 and CBCN3 conductors slightly differs at ±0.2T ac field and various frequencies. According to the SULTAN test result, $T_\mathrm{cs}$ of CBCN2 and CBCN3 conductor samples meet the ITER acceptance criteria of 7.0 K at Bpeak field is 2.9 T and 10 kA.

Published
2016
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5. Overview of Progress on the EU DEMO Reactor Magnet System Design

Author

Elena Gaio, Monika Lewandowska, M. Vojenciak, P.V. Gade, Anna Kario, Francois Nunio, Fedor Gömöry, M. Coleman, Christoph M. Bayer, K. Sedlak, Ion Tiseanu, Arend Nijhuis, Louis Zani, Reinhard Heller, I. Duran, Anatoly Panin, R. Vallcorba, Wilfried Goldacker, J.-M. Poncet, K A Yagotintsev, Xavier Granados, M. Sanmarti Cardona, C. Hoa, Rainer Wesche, Marco Evangelos Biancolini, F. Giorgetti, B. Lacroix, Traian Petrisor, Pierluigi Bruzzone, Daniel Ciazynski, R. Prokopec, K.P. Weiss, Simonetta Turtu, Roberto Bonifetto, A. Maistrello, C. Brutti, Michael Eisterer, Sonja I. Schlachter, Laura Savoldi, Luigi Muzzi, Boris Stepanov, Roberto Zanino, Walter H. Fietz, Alexandre Torre, P. Hertout, Faculty of Science and Technology, Energy, Materials and Systems, Turtù, S., and Muzzi, L.

Subjects
Engineering, Tokamak, LTS, Superconducting magnet, 01 natural sciences, 010305 fluids & plasmas, law.invention, Conceptual design, law, 0103 physical sciences, superconducting magnet, Nb3Sn, Electrical and Electronic Engineering, 010306 general physics, Fusion, DEMO, METIS-320406, business.industry, Toroidal field, Condensed Matter Physics, Project team, Electronic, Optical and Magnetic Materials, Settore ING-IND/14 - Progettazione Meccanica e Costruzione di Macchine, Electricity generation, IR-103872, Magnet, superconducting magnets, HTS, fusion, 2023 OA procedure, Systems engineering, Systems design, business
Abstract

The DEMO reactor is expected to be the first application of fusion for electricity generation in the near future. To this aim, conceptual design activities are progressing in Europe (EU) under the lead of the EUROfusion Consortium in order to drive on the development of the major tokamak systems. In 2014, the activities carried out by the magnet system project team were focused on the toroidal field (TF) magnet system design and demonstrated major achievements in terms of concept proposals and of consolidated evaluations against design criteria. Several magnet system RD activities were conducted in parallel, together with broad investigations on high temperature superconductor (HTS) technologies. In this paper, we present the outcomes of the work conducted in two areas in the 2014 magnet work program: 1) the EU inductive reactor (called DEMO1) 2014 configuration (power plant operating under inductive regime) was the basis of conceptual design activities, including further optimizations; and 2) the HTS RD activities building upon the consolidated knowledge acquired over the past years. © 2016 IEEE.

Published
2016
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6. Measurement of $F_2^{c\bar{c}}$ and $F_2^{b\bar{b}}$ at high Q 2 using the H1 vertex detector at HERA

Author

G. G. Winter, G. Thompson, A. Nikiforov, Denis Johnson, K. H. Hiller, R. C. W. Henderson, S. Levonian, Jochen Dingfelder, Y.R. Coppens, T. Frisson, I. Strauch, Philipp Fleischmann, A. Baghdasaryan, A. Rostovtsev, Leif J. Jönsson, Carl Gwilliam, Yves Sirois, O. Behrendt, S. Vinokurova, R. Lemrani, P. Kostka, A. Specka, T. Klimkovich, Dirk L. Hoffmann, David South, J-P. Meyer, G. Franke, B. Vujicic, R. Oganezov, D. Utkin, J. Bähr, A. Makankine, G. Buschhorn, Matthias Ulrich Mozer, J. Turnau, Michael Schneider, A. Fedotov, Günter Flügge, J. Zalesak, R. Roosen, Wolfgang Lange, C. Niebuhr, Grzegorz Nowak, D. Ozerov, R. Weber, S. Ginzburgskaya, J. Gayler, R. Koutouev, A. Petrukhin, V. Andreev, M. Hildebrandt, Johannes Haller, Y. Soloviev, L. Lindfeld, J. E. Olsson, W. Bartel, A. D.R. Vargas Trevino, H. U. Martyn, Matthias Klein, C. Kiesling, E. E. Elsen, Ahmed Tarek Abouelfadl Mohamed, V. Lubimov, A. De Roeck, E. Tzamariudaki, A. J. Campbell, C. Wigmore, F. P. Schilling, M.-O. Boenig, John A Coughlan, B. Portheault, F. W. Büsser, K. Sedlak, Magnus Hansson, V. Jemanov, Peter Robmann, S. Mangano, Christoph Grab, E. Malinovski, Emmanuel Sauvan, K. Nankov, Roland Horisberger, V. Lendermann, A. Valkárová, V. Schröder, G. Grindhammer, Nicolas Berger, L. N. Shtarkov, I. R. Kenyon, T. Berndt, E. Perez, N. Werner, Michael R. Wessels, Natasa Raicevic, L. Goerlich, P. D. Thompson, V. Brisson, B. Leissner, S. Backovic, Vincent Boudry, D. P. C. Sankey, J. Zimmermann, R. Gerhards, A. Zhelezov, S. Baudrand, B. Stella, Adrian Perieanu, N. Keller, Martin Karlsson, Paul Newman, Zuzana Rurikova, Stefan Schmitt, A. N. Morozov, V. Yeganov, Paul Laycock, H. Lueders, D. Perez-Astudillo, M. Gregori, A. Dubak, R. Eichler, Georgios Tsipolitis, M. Fleischer, Ewelina Lobodzinska, Gerhard Brandt, Matthew Beckingham, M. Goettlich, T. Laštovička, F. Moreau, S. J. Aplin, V. Volchinski, H. Meyer, Y. Vazdik, R. Demirchyan, D. Lüke, Anna Kropivnitskaya, A. Aktas, E. Barrelet, B. Olivier, V. Chekelian, R. Felst, Xavier Janssen, J. Formánek, L. Bystritskaya, M. Peez, Stefania Xella, David Milstead, Zhen Zhang, D. Meer, E. A. De Wolf, Ch. Berger, Karlheinz Meier, H. Zohrabyan, D.P. Brown, S. Essenov, Ricardo Lopez-Fernandez, S. Baumgartner, Bogdan Povh, F. Sefkow, P. Höting, M. Jacquet, Th. Naumann, K. Gabathuler, D. Wegener, A. Usik, G. Frising, A. Rimmer, I. Herynek, D. Kant, Benno List, Katerina Lipka, E. Gabathuler, A. Knutsson, J. Garvey, Katja Krüger, Amanda R. Vest, Laurent Schoeffel, Judith Katzy, V. Tchoulakov, A. M. Fomenko, V. Efremenko, Y.H. Fleming, S. Mikocki, Sebastian M. Schmidt, C. Gerlich, C. Goyon, H-C. Schultz-Coulon, R. Pöschl, M. Urban, R. Marshall, T. Kluge, Pavel Murin, H. Grässler, Guenter Eckerlin, André Schöning, I. Milcewicz-Mika, M. Ibbotson, C. Duprel, Laurent Favart, W. Yan, J. Cvach, Ringaile Placakyte, N. Loktionova, A. Hovhannisyan, D. Traynor, C. Risler, G. Weber, U. Straumann, Anton Babaev, J. G. Contreras, I. Tsurin, P. Prideaux, P. Baranov, T. J. Sloan, P.J.W. Faulkner, A.S. Belousov, Sergey Rusakov, M. Ismail, P. Truöl, P. A. Smirnov, J. Wagner, B. Wessling, Juraj Bracinik, D.K. Nikitin, O. Henshaw, C. Wissing, J. Böhme, Murrough Landon, Karel Cerny, Thorsten Lux, L. Janauschek, N. Van Remortel, A. Uraev, S. Gorbounov, J. Zacek, A. Glazov, J. Scheins, K. Müller, Christian Schwanenberger, V. Korbel, Stephen Maxfield, J. Stiewe, Wolfram Erdmann, Andrew Mehta, P. Van Mechelen, N. Gogitidze, W.D. Dau, J. B. Dainton, R. D. Heuer, L. Finke, M. Ellerbrock, G. Herrera, Alexandre Lebedev, Bradley Cox, C. Werner, K. Daum, F. Tomasz, C. Pascaud, G. Knies, S. Egli, S. Ghazaryan, F. Salvaire, D. Haidt, Eram Rizvi, G. Heinzelmann, V. Dodonov, Sascha Caron, E. Wünsch, G. D. Patel, K. Wacker, N. Malden, J. V. Morris, A. Bunyatyan, Dusan Bruncko, B. Naroska, Klaus Kurt Desch, H. Henschel, J.C. Bizot, T. Greenshaw, Erika Garutti, Fabian Zomer, I. Foresti, G. Cozzika, Stefan Valkar, C. Schmitz, H.-B. Bröker, Hannes Jung, Alexander Zhokin, J. Becker, C. Vallée, J. Ferencei, M. Martisikova, J. Naumann, Gero Flucke, M. Kapichine, M. Nozicka, J. Marks, B. Delcourt, Roger Wolf, T. Anthonis, Claus Kleinwort, S. Schätzel, I. Sheviakov, V. Spaskov, J. Kückens, A. B. Meyer, B. Roland, V. Nagovizin, E. E. Woehrling, Pierre Marage, I. Glushkov, Christian Veelken, O. Behnke, F. Eisele, Daniel Pitzl, A. Asmone, F. Cassol-Brunner, L. Hajduk, L. Lytkin, Cristinel Diaconu, and P. E. Reimer

Subjects
Quantum chromodynamics, Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Structure function, HERA, 01 natural sciences, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Vertex detector, Impact parameter, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous)
Abstract

Measurements are presented of inclusive charm and beauty cross sections in e$^+$p collisions at HERA for values of photon virtuality Q$^2$ > 150 GeV$^2$ and of inelasticity 0.1 < y < 0.7. The charm and beauty fractions are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. The data are divided into four regions in Q$^2$ and Bjorken x, and values for the structure functions $F_2^{c\overline{c}}$ and $F_2^{b\overline{b}}$ are obtained. The results are found to be compatible with the predictions of perturbative quantum chromodynamics.

Published
2005
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7. Forward $\pi^\circ$ production and associated transverse energy flow in deep-inelastic scattering at HERA

Author

V. Nagovizin, Leif J. Jönsson, A. Makankine, G. Buschhorn, D. Ozerov, E. E. Woehrling, V. Panassik, Murrough Landon, Grzegorz Nowak, Pierre Marage, R. Koutouev, A. Petrukhin, M. Davidsson, R. Eichler, H. U. Martyn, Christian Veelken, P. Höting, Matthias Klein, S. Gorbounov, J. Rauschenberger, Michael R. Wessels, V. Lubimov, Paul Laycock, V. Brisson, Amanda R. Vest, E. Malinovski, Emmanuel Sauvan, G. Grindhammer, F. Eisele, S. Vassiliev, Jan Hladky, V. Andreev, A. D.R. Vargas Trevino, Dusan Bruncko, P. Van Mechelen, Laurent Schoeffel, Sascha Caron, N. Werner, E. Wünsch, I. Strauch, B. Leiner, Roland Horisberger, A. Valkárová, V. Jemanov, B. Naroska, Martin Karlsson, Dave Sankey, A. Beglarian, P. Dixon, J. Wagner, T. Kuhr, Philipp Fleischmann, Daniel Pitzl, D.P. Brown, E. Perez, Jean-Arcady Meyer, T. Greenshaw, Yves Sirois, J. Böhme, T. Laštovička, J. Formánek, A. Asmone, N. Delerue, M. zur Nedden, F. Cassol-Brunner, J.P. Phillips, L. Hajduk, Juergen Kroseberg, R. Gerhards, Dirk L. Hoffmann, G. Franke, E. Barrelet, G. D. Patel, K. Wacker, O. Behnke, K. Daum, Wolfgang Lange, A. Uraev, E. A. De Wolf, Ch. Berger, L. N. Shtarkov, J. Cvach, Anton Babaev, D. Traynor, J. Gayler, M. Hildebrandt, Georgios Tsipolitis, M. Urban, J. Ferencei, J. G. Contreras, J. Naumann, J.C. Bizot, P. E. Reimer, M. Fleischer, Karlheinz Meier, N. Malden, F. Tomasz, C. Risler, Angela Mehta, G. Knies, J. Marks, K. Gabathuler, Sebastian M. Schmidt, L. Bystritskaya, Claus Kleinwort, Zhen Zhang, G. G. Winter, I. Herynek, Fabian Zomer, Ricardo Lopez-Fernandez, David Schmidt, A. Aktas, P. A. Smirnov, Pavel Murin, Paul Newman, D. Wegener, Matthew Jones, Caroline Collard, B. Wessling, B. Olivier, H. Grässler, P. D. Thompson, L. Goerlich, M. Ibbotson, I. Sheviakov, S. Baumgartner, I. Foresti, G. Cozzika, C. Niebuhr, Bogdan Povh, F. Sefkow, S. Luders, Christian Johnson, Peter Robmann, Stefan Valkar, F. Keil, Denis Johnson, H.-B. Bröker, Hannes Jung, J. V. Morris, Alexander Zhokin, Laurent Favart, J. Zacek, T. Anthonis, A. Usik, M. Jacquet, B. Reisert, Graham Thompson, V. Efremenko, G. Weber, Martin Erdmann, T. Kluge, F. Niebergall, B. Koblitz, Ewelina Lobodzinska, Matthew Beckingham, U. Straumann, G. Frising, A. Bunyatyan, J. Becker, C. Vallée, H. Spitzer, V. Grabski, Benno List, S. Mikocki, Hans-Christian Schultz-Coulon, Beate Heinemann, Peter Truoel, S. Levonian, L. Lytkin, Anna Kropivnitskaya, S. Michine, V. Chekelian, R. Felst, J. Kueckens, D. Kant, I. Milcewicz-Mika, V. Spaskov, Guenter Eckerlin, Gero Flucke, A. Vichnevski, M. Kapichine, M. Nozicka, Cristinel Diaconu, J. Kennedy, V. Korbel, S. Backovic, Juraj Bracinik, André Schöning, Rainer Stamen, Y.R. Coppens, J. E. Olsson, A. Koutov, B. Delcourt, Johannes Haller, F. Moreau, K. Müller, Christian Schwanenberger, H. Lueders, A. B. Meyer, Judith Katzy, W. Erdmann, C. Pascaud, S. Egli, Stephen Maxfield, W. Bartel, J. Stiewe, S. Schätzel, J. Scheins, Alexandre Lebedev, M. Hilgers, C. Werner, Y.H. Fleming, J. Garvey, D. Haidt, A. M. Fomenko, W.D. Dau, J. B. Dainton, David South, J. D. Dowell, C. Gerlich, N. Gogitidze, T. J. Sloan, Eram Rizvi, G. Heinzelmann, V. Lendermann, V. Schröder, Y. Soloviev, V. Dodonov, C. Duprel, F. W. Büsser, W. Braunschweig, M. Ellerbrock, G. Herrera, Bradley Cox, I. R. Kenyon, T. Berndt, S. Ghazaryan, A. Burrage, Natasa Raicevic, F. P. Schilling, Vincent Boudry, S. D. Kolya, A. N. Morozov, R. Pöschl, V. Volchinski, R. Marshall, H. Henschel, K. Rybicki, J. Gassner, H. Meyer, R. Demirchyan, M. Winde, Christoph Grab, Xavier Janssen, B. M. Waugh, D.K. Nikitin, K. H. Hiller, R. C. W. Henderson, O. Henshaw, Jochen Dingfelder, R. Weber, A. Specka, C. Wissing, M.-O. Boenig, S. Mangano, S. Ferron, L. Janauschek, A. Rostovtsev, J. Bähr, A. Fedotov, Günter Flügge, C. Kiesling, A. De Roeck, E. Tzamariudaki, A. J. Campbell, K. Sedlak, Th. Naumann, E. Gabathuler, D. Meer, O. Behrendt, R. Lemrani, P. Kostka, J. Turnau, Michael Schneider, A. Dubak, Y. Vazdik, D. Lüke, M. Peez, David Milstead, A. Astvatsatourov, D. Clarke, John A Coughlan, B. Stella, N. Keller, Stefan Schmitt, J. Zalesak, R. Roosen, E. E. Elsen, R. Heremans, J. Martyniak, N. Loktionova, A. Hovhannisyan, I. Tsurin, M. C. Cousinou, J.E. Turney, P. Baranov, Peter Schleper, P.J.W. Faulkner, A.S. Belousov, and Sergey Rusakov

Subjects
Physics, Quantum chromodynamics, Particle physics, Physics and Astronomy (miscellaneous), Proton, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Parton, HERA, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Transverse plane, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010303 astronomy & astrophysics, Engineering (miscellaneous)
Abstract

Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x \approx 4.10^-5 which give rise to high transverse momentum pi^0 mesons are studied with the H1 experiment at HERA. The inclusive cross section for pi^0 mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the pi^0 and of the four-momentum transfer Q^2 and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward pi^0 meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data.

Published
2004
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8. EDIPO: The Test Facility for High-Current High-Field HTS Superconductors

Author

Pierluigi Bruzzone, Rainer Wesche, K. Sedlak, Boris Stepanov, and D. Uglietti

Subjects
Superconductivity, Materials science, High-temperature superconductivity, high magnetic field, high-temperature superconductors (HTSs), Nuclear engineering, test facility, Condensed Matter Physics, 01 natural sciences, High-current superconducting cables, 010305 fluids & plasmas, Electronic, Optical and Magnetic Materials, law.invention, Magnetic field, Nuclear magnetic resonance, Operating temperature, user interfaces, Electromagnetic coil, law, 0103 physical sciences, Mass flow rate, Electrical and Electronic Engineering, 010306 general physics, Transformer, Electrical conductor
Abstract

The commissioning of the European DIPOle (EDIPO) test facility at the Center for Research in Plasma Physics in Villigen was completed in Spring 2015, and the first test of a 60-kA/12-T high-temperature superconductor (HTS) was carried out in June 2015. User specifications are issued to allow external users to prepare their own sample matching the interface of the test facility. EDIPO offers a background magnetic field up to 12.35 T in a rectangular test well with a cross section of 89 mm $\times$ 138 mm (sample dimension). The homogeneous high field length is 910 mm (±1%) or 680 mm (±0.5%) at full current. A set of small copper coils provides a superimposed ac field with amplitude up to ±0.3 T and frequency up to 1 Hz. A superconducting transformer provides steady-state operating current for the sample up to 100 kA. The cooling circuit of the sample supplies supercritical helium at 10-bar inlet pressure. The mass flow rate, which is adjustable by cryogenic valves, is up to 8 g/s in each branch of the sample at 4.5 K. The operating temperature ranges from 4.5 to 60 K (at high temperature, the range of mass flow rate is reduced). To test samples at temperature higher than 10 K, an HTS “adapter” connects the sample to the NbTi transformer plates, which must remain cold. In such case, the length of the sample is reduced from 3600 mm (typical low-temperature superconductor sample) to 2900 mm (HTS sample with adapter).

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