Model for screening of resonant magnetic perturbations by plasma in a realistic tokamak geometry and its impact on divertor strike points

0366763 - ÚFP 2012 RIV NL eng J - Journal Article
Cahyna, Pavel - Nardon, E.
Model for screening of resonant magnetic perturbations by plasma in a realistic tokamak geometry and its impact on divertor strike points.
Journal of Nuclear Materials. Roč. 415, č. 1 (2011), S927-S931. ISSN 0022-3115. E-ISSN 1873-4820.
[International Conference on Plasma-Surface Interactions in Controlled Fusion Device/19th./. San Diego, 24.05.2010-28.05.2010]
R&D Projects: GA MŠMT 7G09042; GA MŠMT LA08048
Institutional research plan: CEZ:AV0Z20430508
Keywords : tokamaks * ELM control * resonant magnetic perturbations * divertor
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 2.052, year: 2011
http://dx.doi.org/10.1016/j.jnucmat.2011.01.117

This work addresses the question of the relation between strike-point splitting and magnetic stochasticity at the edge of a poloidally diverted tokamak in the presence of externally imposed magnetic perturbations. More specifically, ad-hoc helical current sheets are introduced in order to mimic a hypothetical screening of the external resonant magnetic perturbations by the plasma. These current sheets, which suppress magnetic islands, are found to reduce the amount of splitting expected at the target, which suggests that screening effects should be observable experimentally. Multiple screening current sheets reinforce each other, i.e. less current relative to the case of only one current sheet is required to screen the perturbation.
Permanent Link: http://hdl.handle.net/11104/0201635