Collective fast ion instability-induced losses in National Spherical Tokamak Experiment
Collective fast ion instability-induced losses in National Spherical Tokamak Experiment
复制标题
国家球形托卡马克实验中集体快离子不稳定引起的损失
DOI：
10.1063/1.2178788
复制
发表时间：
2006
影响因子：
2.2
通讯作者：
F. Levinton
中科院分区：
文献类型：
--
作者：
E. Fredrickson;R. Bell;D. Darrow;G. Fu;N. Gorelenkov;B. LeBlanc;S. Medley;J. Menard;H. Park;A. Roquemore;W. Heidbrink;S. Sabbagh;D. Stutman;K. Tritz;N. Crocker;S. Kubota;W. Peebles;K. Lee;F. Levinton
在国家球环实验(NSTX)中，在中性束注入(NBI)过程中激发了各种各样的快离子驱动不稳定性。Fusion 40,557(2000)]由于快离子速度与阿尔芬速度、VFast/VAlfven和高快离子β之比很大。热核实验堆中VFast/VAlfven的比率[nucl.Fusion 39,2137(1999)]和NSTX具有可比性。这些模式可分为三类：频率范围为0~120 kHz的啁啾高能粒子模式(EPM)，频率范围为50 kHz~200 kHz的环形Alfven本征模(TAE)，以及300 kHz至离子回旋频率之间的压缩Alfven本征模(CAE)和整体Alfven本征模(GAE)。快速离子驱动模式特别令人感兴趣，因为它们有可能导致大量的快速离子损失。在NBI加热运行的所有区域中，我们都可以看到瞬时中子率下降，这与TAE或鱼骨状EPM的爆发有关。快离子损失事件主要与EPM相关，尽管...
A wide variety of fast ion driven instabilities are excited during neutral beam injection (NBI) in the National Spherical Torus Experiment (NSTX) [Nucl. Fusion 40, 557 (2000)] due to the large ratio of fast ion velocity to Alfven velocity, Vfast∕VAlfven, and high fast ion beta. The ratio Vfast∕VAlfven in ITER [Nucl. Fusion 39, 2137 (1999)] and NSTX is comparable. The modes can be divided into three categories: chirping energetic particle modes (EPM) in the frequency range 0 to 120kHz, the toroidal Alfven eigenmodes (TAE) with a frequency range of 50kHz to 200kHz, and the compressional and global Alfven eigenmodes (CAE and GAE, respectively) between 300kHz and the ion cyclotron frequency. Fast ion driven modes are of particular interest because of their potential to cause substantial fast ion losses. In all regimes of NBI heated operation we see transient neutron rate drops, correlated with bursts of TAE or fishbone-like EPMs. The fast ion loss events are predominantly correlated with the EPMs, although ...