Stochastic diffusion of energetic ions in optimized stellarators
Stochastic diffusion of energetic ions in optimized stellarators
复制标题
优化仿星器中高能离子的随机扩散
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
H. Wobig
中科院分区：
文献类型：
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作者：
C. Beidler;Y. Kolesnichenko;V. Marchenko;I. Sidorenko;H. Wobig
结果表明，在优化的温德尔斯坦线仿星器中，局部俘获和通过粒子轨道的无碰撞变换导致高能离子的随机扩散。该扩散可导致从特征扩散时间与减慢时间相比小的区域损失大部分高能离子群体。可以通过成形等离子体温度和密度分布来最小化损失区域和损失，使得它们满足某些要求。本文所发展的理论的预测与Helias反应堆中α粒子约束的数值模拟结果是一致的，后者是用轨道跟踪程序进行的。
It is shown that the collisionless transformation of locally trapped and passing particle orbits in the optimized stellarators of the Wendelstein line results in stochastic diffusion of energetic ions. This diffusion can lead to the loss of a significant fraction of the energetic ion population from the region where the characteristic diffusion time is small compared to the slowing down time. The loss region and losses can be minimized by shaping the plasma temperature and density profiles so that they satisfy certain requirements. The predictions of the theory developed here are in agreement with the results of numerical modeling of α-particle confinement in a Helias reactor, which has been carried out with the use of an orbit following code.