Monte Carlo simulation of ICRF discharge initiation in ITER

M. Tripský, T. Wauters, A. Lyssoivan, A. Krivská, F. Louche, M. Van Schoor, J. M. Noterdaeme

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Résumé

Discharges produced and sustained by ion cyclotron range of frequency (ICRF) waves in absence of plasma current will be used on ITER for (ion cyclotron-) wall conditioning (ICWC). The here presented simulations aim at ensuring that the ITER ICRH&CD system can be safely employed for ICWC and at finding optimal parameters to initiate the plasma. The 1D Monte Carlo code RFdinity1D3V was developed to simulate ICRF discharge initiation. The code traces the electron motion along one toroidal magnetic field line, accelerated by the RF field in front of the ICRF antenna. Electron collisions in the calculations are handled by a Monte Carlo procedure taking into account their energies and the related electron collision cross sections for collisions with H2, H2+ and H+. The code also includes Coulomb collisions between electrons and ions (e - e,e - H2+,e - H+). We study the electron multiplication rate as a function of the RF discharge parameters (i) antenna input power (0.1-5MW), and (ii) the neutral pressure (H2) for two antenna phasing (monopole [0000]-phasing and small dipole [0ππ]-phasing). Furthermore, we investigate the electron multiplication rate dependency on the distance from the antenna straps. This radial dependency results from the decreasing electric amplitude and field smoothening with increasing distance from the antenna straps. The numerical plasma breakdown definition used in the code corresponds to the moment when a critical electron density nec for the low hybrid resonance (ς) = ςLHR) is reached. This numerical definition was previously found in qualitative agreement with experimental breakdown times obtained from the literature and from experiments on the ASDEX Upgrade and TEXTOR.

langue originaleAnglais
titreRadio Frequency Power in Plasmas
Sous-titreProceedings of the 21St Topical Conference
rédacteurs en chefRobert I. Pinsker
EditeurAmerican Institute of Physics Inc.
ISBN (Electronique)9780735413368
Les DOIs
étatPublié - 10 déc. 2015
Evénement21st Topical Conference on Radiofrequency Power in Plasmas - Lake Arrowhead, États-Unis
Durée: 27 avr. 201529 avr. 2015

Série de publications

NomAIP Conference Proceedings
Volume1689
ISSN (imprimé)0094-243X
ISSN (Electronique)1551-7616

Une conférence

Une conférence21st Topical Conference on Radiofrequency Power in Plasmas
Pays/TerritoireÉtats-Unis
La villeLake Arrowhead
période27/04/1529/04/15

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