Superbanana transport in the collisional heating of a plasma column forced across a squeeze potential
Superbanana transport in the collisional heating of a plasma column forced across a squeeze potential
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等离子体柱碰撞加热中的超级香蕉传输被迫跨越挤压势
DOI：
10.1063/1.5001062
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发表时间：
2017
影响因子：
2.2
通讯作者：
D. Dubin
中科院分区：
文献类型：
--
作者：
D. Dubin
当弱碰撞等离子体具有局部捕获的粒子群时，对等离子体平衡的扰动（如波或静态场误差）可以诱导粒子分布函数中的相空间不连续，从而通过超级香蕉输运强烈增强熵产生、等离子体损失和波阻尼。本文介绍了这种超级香蕉传输过程的一个简单版本，其中等离子体被加热，因为它被缓慢地强迫在挤压电位上来回移动（频率ω与粒子弹跳频率相比很小）。挤压势将低能粒子困在挤压势的两侧，但高能粒子可以通过。捕获粒子和通过粒子对作用力的响应不同，导致捕获粒子和通过粒子在分离矩阵处的分布函数出现无碰撞不连续。给出了绝热分布函数和非绝热分布函数的表达式。
When weakly collisional plasmas have locally trapped particle populations, perturbations to the plasma equilibrium (such as waves or static field-errors) can induce phase-space discontinuities in the particle distribution function that strongly enhance entropy production, plasma loss, and wave damping via superbanana transport. This paper presents a simple version of this superbanana transport process, wherein a plasma is heated as it is slowly forced back and forth across a squeeze potential (at a frequency ω that is small compared with the particle bounce frequency). The squeeze potential traps low-energy particles on either side of the squeeze, but particles with higher energy can pass through it. Trapped and passing particles have different responses to the forcing, causing a collisionless discontinuity in the distribution function at the separatrix between the trapped and passing particles. Expressions for both the adiabatic and non-adiabatic distribution functions are presented, and the heating rate...