Abstract A Fokker－Planck study is carried out for tokamak electron cyclotron resonance heating by writing the quasi-linear diffusion operator into a form adaptive to the collision operator and considering the wave absorption characteristics of both the O-mode and the X-mode in different magnetic surfaces. Though the Fokker－Planck code is non-relativistic in nature, however, if the relativistic resonance condition for the nearly perpendicularly propagating waves is treated suitably, we can obtain correct results. The energy loss mechanism through anomalous transport is also modelled using a suitable loss term. In the heating phase, the electron distribution deviates from the Maxwellian distribution substantially, which leads to non-linear absorption characteristics. The wave damping rate is non-linear and changes with time. The electron pressure is usually anisotropic under different conditions: pe⊥/pe‖>2 for different D0 and $\tau_e$.
Received: 13 May 2003
Revised: 26 May 2003
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10135020).
Cite this article:
Shi Bing-Ren (石秉仁), Long Yong-Xing (龙永兴), Dong Jia-Qi (董家齐), Li Wen-Zhong (郦文忠), Jiao Yi-Ming (焦一鸣), Wang Ai-Ke (王爱科) Fokker-planck study of tokamak electron cyclotron resonance heating 2003 Chinese Physics 12 1251
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