Observation of MHD induced fast ion losses on the CHS heliotron/torsatron
Observation of MHD induced fast ion losses on the CHS heliotron/torsatron
复制标题
CHS 日光管/托萨管上 MHD 引起的快离子损失的观察
DOI：
10.1088/0029-5515/40/9/302
复制
发表时间：
2000
期刊：
影响因子：
3.3
通讯作者：
K. Matsuoka
中科院分区：
文献类型：
--
作者：
T. Kondo;M. Isobe;M. Sasao;D. Darrow;K. Toi;M. Takechi;G. Matsunaga;M. Osakabe;Y. Yoshimura;C. Takahashi;S. Nishimura;S. Okamura;K. Matsuoka
在CHS Heliotron/Torsatron上用能量和俯仰角分辨的闪烁探测器观测了MHD引起的束流离子损失。逃逸到探测器的束离子的特点是使用轨道计算代码。有人发现，两种类型的离子，即“通过边界离子”和“被困离子”，定期丢失在m/n = 3/2鱼骨状不稳定性。快离子的射出在模振幅上存在阈值。在该阈值以上，损耗随着模式振幅的增加而增强。鱼骨状不稳定性的激发和MHD引起的损失的增强在很大程度上取决于等离子体中束离子的积累程度。轨道计算表明，在q = 3/2表面附近，具有大俯仰角且v接近于零（或接近于磁波动的传播速度）的边界离子，会被不稳定性所喷射。
MHD induced beam ion losses were observed on the CHS heliotron/torsatron with an energy and pitch angle resolved scintillator detector. Beam ions escaping into the probe were characterized using orbit calculation codes. It was found that two types of ions, namely `passing boundary ions' and `trapped ions', were lost periodically during an m/n = 3/2 fishbone-like instability. There are thresholds in the mode amplitude for the ejection of fast ions. Above this threshold, losses are enhanced together with an increase of the mode amplitude. The excitation of the fishbone-like instability and the enhancement of MHD induced losses strongly depend on the degree of accumulation of beam ions in the plasma. Orbit calculations show that passing boundary ions, which have large pitch angle and v close to zero (or close to the propagating velocity of the magnetic fluctuation) near the q = 3/2 surface, are ejected by the instability.
影响因子：
3.3
作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox
通讯作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox