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 - Článek v odborném periodiku
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]
Grant CEP: GA MŠMT 7G09042; GA MŠMT LA08048
Výzkumný záměr: CEZ:AV0Z20430508
Klíčová slova: tokamaks * ELM control * resonant magnetic perturbations * divertor
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 2.052, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0201635