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Start Over Author "Hron M" Journal plasma physics and controlled fusion
15 results on '"Hron M"'

2. Real-time feedback system for divertor heat flux control at COMPASS tokamak

Author

Khodunov, I, primary, Komm, M, additional, Havranek, A, additional, Adamek, J, additional, Bohm, P, additional, Cavalier, J, additional, Seidl, J, additional, Devitre, A, additional, Dimitrova, M, additional, Elmore, S, additional, Faitsch, M, additional, Hacek, P, additional, Havlicek, J, additional, Hron, M, additional, Imrisek, M, additional, Krbec, J, additional, Peterka, M, additional, Panek, R, additional, Samoylov, O, additional, Tomes, M, additional, Tomova, K, additional, Vondracek, P, additional, and Weinzettl, V, additional

Published
2021
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4. Sheared flows and turbulence in fusion plasmas

Author

Pedrosa, M A, primary, Carreras, B A, additional, Hidalgo, C, additional, Silva, C, additional, Hron, M, additional, García, L, additional, Alonso, J A, additional, Calvo, I, additional, de Pablos, J L, additional, and Stöckel, J, additional

Published
2007
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5. Multi-machine studies of the role of turbulence and electric fields in the establishment of improved confinement in tokamak plasmas

Author

Oost, G Van, primary, Bulanin, V V, additional, Donné, A J H, additional, Gusakov, E Z, additional, Kraemer-Flecken, A, additional, Krupnik, L I, additional, Melnikov, A, additional, Nanobashvili, S, additional, Peleman, P, additional, Razumova, K A, additional, Stöckel, J, additional, Vershkov, V, additional, Adamek, J, additional, Altukov, A B, additional, Andreev, V F, additional, Askinazi, L G, additional, Bondarenko, I S, additional, Brotankova, J, additional, Dnestrovskij, A Yu, additional, Duran, I, additional, Eliseev, L G, additional, Esipov, L A, additional, Grashin, S A, additional, Gurchenko, A D, additional, Hogeweij, G M D, additional, Hron, M, additional, Ionita, C, additional, Jachmich, S, additional, Khrebtov, S M, additional, Kouprienko, D V, additional, Lysenko, S E, additional, Martines, E, additional, Perfilov, S V, additional, Petrov, A V, additional, Popov, A Yu, additional, Reiser, D, additional, Schrittwieser, R, additional, Soldatov, S, additional, Spolaore, M, additional, Stepanov, A Yu, additional, Telesca, G, additional, Urazbaev, A O, additional, Verdoolaege, G, additional, Zacek, F, additional, and Zimmermann, O, additional

Published
2007
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10. Turbulent transport reduction byE Bvelocity shear during edge plasma biasing: recent experimental results

Author

Oost, G Van, primary, Ad mek, J, additional, Antoni, V, additional, Balan, P, additional, Boedo, J A, additional, Devynck, P, additional,  uran, I, additional, Eliseev, L, additional, Gunn, J P, additional, Hron, M, additional, Ionita, C, additional, Jachmich, S, additional, Kirnev, G S, additional, Martines, E, additional, Melnikov, A, additional, Schrittwieser, R, additional, Silva, C, additional, St ckel, J, additional, Tendler, M, additional, Varandas, C, additional, Schoor, M Van, additional, Vershkov, V, additional, and Weynants, R R, additional

Published
2003
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13. Magnetic and electrostatic fluctuations in the CASTOR tokamak

Author

Stöckel, J, primary, Badalec, J, additional, Duran, I, additional, Hron, M, additional, Horácek, J, additional, Jakubka, K, additional, Kryska, L, additional, Petrzílka, J, additional, Zácek, F, additional, Heller, M V P, additional, Brazilio, Z A, additional, and Caldas, I L, additional

Published
1999
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14. Edge localized modes and fluctuations in the JET SOL region

Author

Gonçalves, B BG, Hidalgo, C CH, Pedrosa, M MAP, Silva, C CS, Balbín, R RB, Erents, K KE, Hron, M MH, Loarte, A AL, and Matthews, G GM

Abstract

The statistical properties of the radial propagation of edge localized modes (ELMs) have been investigated in the Scrape-off layer (SOL) region of the JET tokamak. ELM events propagate radially with effective radial velocities in the range of 1000 m s−1. Experimental results show a link between the radial velocity and the size of transport events. This suggests the importance of the competition between both parallel and radial transport to explain particle losses onto the divertor plates. Parallel flows show a transient increase during the appearance of ELMs, providing evidence of a coupling between parallel dynamics and radial transport.

Published
2003

15. Turbulent transport reduction by <iopmath latex="$\hbox{\bit E}\times\hbox{\bit B}$">E×B</iopmath> velocity shear during edge plasma biasing: recent experimental results

Author

Oost, G Van, Adámek, J, Antoni, V, Balan, P, Boedo, J A, Devynck, P, &Dcheck;uran, I, Eliseev, L, Gunn, J P, Hron, M, Ionita, C, Jachmich, S, Kirnev, G S, Martines, E, Melnikov, A, Schrittwieser, R, Silva, C, Stöckel, J, Tendler, M, Varandas, C, Schoor, M Van, Vershkov, V, and Weynants, R R

Abstract

Experiments in the tokamaks TEXTOR, CASTOR, T-10 and ISTTOK, as well as in the reversed field pinch RFX have provided new and complementary evidence on the physics of the universal mechanism of E×B velocity shear stabilization of turbulence, concomitant transport barrier formation and radial conductivity by using various edge biasing techniques. In TEXTOR the causality between transport reduction and induced electric fields in the edge has been for the first time clearly demonstrated. The high electric field gradients have been identified as the cause for the quenching of turbulent cells. A quantitative analysis of the measured transport reduction is in good agreement with theoretical predictions. The scaling of plasma turbulence suppression with velocity shear has been established, revealing the density-potential cross-phase as a key element. Reduction in poloidal electric field, temperature, and density fluctuations across the shear layer lead to a reduction of the anomalous conducted and convected heat fluxes resulting in an energy transport barrier that is measured directly. In CASTOR the biasing electrode is placed at the separatrix in a non-intrusive configuration which has demonstrated strongly sheared electric fields and consequent improvement of the global particle confinement, as predicted by theory. The impact of sheared E×B flow on edge turbulent structures has been measured directly using a comprehensive set of electrostatic probe arrays as well as emissive probes. Measurements with a full poloidal Langmuir probe array have revealed quasi-coherent electrostatic waves in the SOL with a dominant mode number equal to the edge safety factor. In T-10 edge biasing is clearly improving the global performance of ECR heated discharges. Reflectometry and heavy ion beam probe measurements show the existence of a narrow plasma layer with strong suppression of turbulence. On ISTTOK, the influence of alternating positive and negative electrode and (non-intrusive) limiter biasing has been compared. Electrode biasing is found to be more efficient in modifying the radial electric field Er and confinement, limiter biasing acting mainly on the SOL. In the RFX reversed field pinch it has been demonstrated that also in RFPs biasing can increase the local E×B velocity shear in the edge region, and hence substantially reduce the local turbulence driven particle flux mainly due to a change in the relative phase between potential and density fluctuations.

Published
2003

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