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Plasma Transport Induced by Cyclotron Resonance

回旋共振引起的等离子体传输

基本信息

批准号：
03452280
负责人：
HATAKEYAMA Rikizo
金额：
$ 4.29万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452280/
关键词：
Nonuniform rf Traveling rf Cyclotron resonance Particle drift Plasma transport

项目摘要

We obtained the following results on plasma transports induced by nonuniform or traveling radio-frequency (rf) fields with cyclotron frequencies. 1. It is theoretically found that plasma particles drift in the radially-outward direction under axisymmetric rf fields with radially-increasing amplitude. 2. This is demonstrated in the Q-machine experiment where electromagnetic fields around the ion-cyclotron frequency are inductively excited by a multi-turn loop antenna (m=0). The plasma profile in the vicinity of the antenna is periodically modified to be largely peaked and hollow with the applied rf period. This large-scale expansion and compression of the plasma finally leads to the radially outward ion-drift, resulting in a high-energy ion collision with the antenna. 3. Far from the antenna along the plasma flow, on the other hand, radial profiles of density and ion perpendicular temperature show stationary peaks at the plasma-column center, where antenna near-fields spatially damp but a plasma (ion Berstein) wave still persists. 4. In order to explain this peaking phenomenon observed, a new mechanism is pro-posed on plasma particle drifts due to perpendicularly traveling waves with cyclo-tron frequencies. The theory including physical picture, analytic solution and numerical analysis is successfully developed. 5. According to our theory it is expected that plasma particles drift in the radi-ally-outward or -inward direction, depending on the propagation direction of rf fields. Thus, we continue to demonstrate this transport principle experimentally by setting an antenna array in the Q-machine, where the azimuthal mode of traveling waves is externally controlled.

我们得到了下列关于回旋频率的非均匀或行波射频场诱导的等离子体输运的结果。1.从理论上发现，等离子体粒子在轴对称射频场与径向增加的幅度在径向向外的方向漂移。2.这在Q机实验中得到了证明，其中离子回旋频率周围的电磁场由多匝环形天线（m=0）感应激发。在天线附近的等离子体分布周期性地修改，以在很大程度上与所施加的射频周期的峰值和空心。等离子体的这种大规模膨胀和压缩最终导致径向向外的离子漂移，导致高能离子与天线碰撞。3.远离天线沿着的等离子体流，另一方面，径向分布的密度和离子垂直温度显示固定的峰值在等离子体柱中心，天线近场空间阻尼，但等离子体（离子Berstein）波仍然存在。4.为了解释这种峰化现象，提出了一种新的机制，即等离子体粒子漂移是由具有回旋频率的垂直行波引起的。成功地建立了包括物理图像、解析解和数值分析在内的理论。5.根据我们的理论，预计等离子体粒子的漂移在径向向外或向内的方向，这取决于射频场的传播方向。因此，我们继续通过在Q机中设置天线阵列来实验性地证明这种传输原理，其中行波的方位角模式是外部控制的。