Trapped particles and asymmetry-induced transport
Trapped particles and asymmetry-induced transport
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DOI：
10.1063/1.1564089
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发表时间：
2003-05-01
影响因子：
2.2
通讯作者：
Driscoll, CF
中科院分区：
文献类型：
--
作者：
Kabantsev, AA;Yu, JH;Driscoll, CF
实验表征了柱状电子等离子体中捕获的粒子模和相关的非对称诱导输运。电场或磁场的轴向变化导致粒子捕获，并使ExB漂移捕获粒子模。当禁闭场也具有theta不对称性时，跨囚禁分界线的碰撞扩散会导致模的衰减，并导致体径向输运。测量的非对称诱导输运率与测量的模式阻尼率成正比，对所有其他等离子体参数进行简单的定标。即使是很弱的俘获场(DeltaB/B类似于10(-3))也能观察到显著的输运，这可能解释了在单组分等离子体中如此普遍地观察到的“反常”背景输运。(C)2003年美国物理研究所。
Trapped particle modes and the associated asymmetry-induced transport are characterized experimentally in cylindrical electron plasmas. Axial variations in the electric or magnetic confinement fields cause the particle trapping, and enable the ExB drift trapped-particle modes. Collisional diffusion across the trapping separatrix causes the modes to damp, and causes bulk radial transport when the confinement fields also have theta asymmetries. The measured asymmetry-induced transport rates are directly proportional to the measured mode damping rates, with simple scalings for all other plasma parameters. Significant transport is observed for even weak trapping fields (deltaB/Bsimilar to10(-3)), possibly explaining the "anomalous" background transport observed so ubiquitously in single species plasmas. (C) 2003 American Institute of Physics.