Phase-space dependent critical gradient behavior of fast-ion transport due to Alfvén eigenmodes
作者: C.S. CollinsW.W. HeidbrinkM. PodestàR.B. WhiteG.J. KramerD.C. PaceC.C. PettyL. StagnerM.A. Van ZeelandY.B. ZhuThe DIII-D Team
作者单位: 1General Atomics, PO Box 85608, San Diego, CA 92186-5608, United States of America
2University of California at Irvine, Irvine, CA 92697, United States of America
3Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ 08543-0451, United States of America
刊名: Nuclear Fusion, 2017, Vol.57 (8)
来源数据库: Institute of Physics Journal
DOI: 10.1088/1741-4326/aa720c
原始语种摘要: Experiments in the DIII-D tokamak show that many overlapping small-amplitude Alfvén eigenmodes (AEs) cause fast-ion transport to sharply increase above a critical threshold in beam power, leading to fast-ion density profile resilience and reduced fusion performance. The threshold is above the AE linear stability limit and varies between diagnostics that are sensitive to different parts of fast-ion phase-space. Comparison with theoretical analysis using the nova and orbit codes shows that, for the neutral particle diagnostic, the threshold corresponds to the onset of stochastic particle orbits due to wave-particle resonances with AEs in the measured region of phase space. The bulk fast-ion distribution and instability behavior was manipulated through variations in beam deposition geometry,...
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  • gradient 倾斜度
  • threshold 阈值
  • transport 输运
  • critical 临界的
  • agreement 协议
  • dependent 从属的
  • tokamak 托卡马克
  • particle 颗粒
  • resilience 弹性
  • avoid 取消