Damping of Geodesic Acoustic Mode by Trapped Electrons

ZHANG Shuangxi(张双喜); GAO Zhe(高喆); WU Wentao(武文韬); QIU Zhiyong(仇志勇)

doi:10.1088/1009-0630/16/7/04

Plasma Science and Technology > 2014 > 16(7): 650-656. > DOI: 10.1088/1009-0630/16/7/04

ZHANG Shuangxi(张双喜), GAO Zhe(高喆), WU Wentao(武文韬), QIU Zhiyong(仇志勇). Damping of Geodesic Acoustic Mode by Trapped Electrons[J]. Plasma Science and Technology, 2014, 16(7): 650-656. DOI: 10.1088/1009-0630/16/7/04

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Damping of Geodesic Acoustic Mode by Trapped Electrons

1 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China 2 Key Laboratory of Pulsed Power, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China 3 Department of Engineering Physics, Tsinghua University, Beijing 100084, China 4 Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China

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Received Date: April 18, 2013

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Abstract

Abstract

We study the Landau resonance between geodesic acoustic mode (GAM) and trapped electrons as a GAM’s collisionless damping. The assumption of ¯ ω _de « ω_be is adopted. The damping rate induced by trapped electrons is found to be an increasing function of _^q. In low q range, circulating-ion-induced damping rate is larger than that induced by trapped electrons. As q increases, the latter becomes larger than the former. The reason is that trapped electrons’ resonant velocity is close to v_te from the lower side, whiles circulating ions’ resonant velocity gets bigger further from v_ti . So the number of resonant trapped electrons increases, whiles the number of resonant circulating ions decreases. The amplitude of damping rate induced by trapped electrons in the edge plasma can be comparable to that induced by circulating ions in the low q range. Another phenomenon we found is that in the chosen range of ε, the damping caused by trapped electrons has a maximum value at point ε_q for different q. The reason is that as ε is close to ε_q, trapped electorns’ resonant velocity is close to v _te .
- geodesic acoustic mode,
- landau resonance,
- trapped electrons,
- bounce frequency

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References (19)

References

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