Multi-phase simulation of fast ion profile flattening due to Alfv$'e$n eigenmodes in a DIII-D experiment
藤堂 泰*; Van Zeeland, M. A.*; Bierwage, A.; Heidbrink, W. W.*
Todo, Yasushi*; Van Zeeland, M. A.*; Bierwage, A.; Heidbrink, W. W.*
The hybrid code MEGA, which simulates the interaction between fast ions and an MHD fluid, is extended with realistic beam deposition profile and collisions. It is used for multi-phase simulations, where classical simulations (fast ion source + collisions) and hybrid simulations (source + collisions + MHD) are run alternatingly. In a multi-phase simulation of DIII-D discharge 142111, it is found that the stored beam ion energy is saturated due to toroidal Alfv$'e$n eigenmodes (TAE) at a level lower than in the purely classical simulation. This is consistent with the experimental observation. After the stored fast ion energy is saturated, it is demonstrated by hybrid simulations that the fast ion spatial profile is significantly flattened due to the interaction with the multiple TAEs with amplitude $$v$$/$$v$$$$_{rm A}$$ and $$delta$$$$B$$/$$B$$ of order 10e-4. The temperature fluctuations caused by TAEs are of the order of 1% of the equilibrium temperature. This is also comparable with ECE measurements in the experiment.
使用言語 : English
掲載資料名 : Nuclear Fusion
: 54
: 10
ページ数 : p.104012_1 - 104012_13
発行年月 : 2014/10
出版社名 : IOP Publishing
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登録番号 : AA20130892
抄録集掲載番号 : 42001434
論文投稿番号 : 15060
Accesses  (From Jun. 2, 2014)
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