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.

我们在具有回旋频率的非均匀或行进射频（RF）磁场引起的血浆传输方面获得了以下结果。 1。从理论上讲，血浆颗粒在轴对称的RF场下方散发出辐射幅度的幅度呈径向振幅。 2。这在Q机器实验中证明了这一点，其中在离子 - 循环频率周围的电磁场通过多转环天线（M = 0）受到感应激发。天线附近的等离子体谱在施加的RF时期被定期修改为在很大程度上达到峰值和空心。血浆的这种大规模膨胀和压缩最终导致径向向外离子 - 导致与天线的高能离子碰撞。 3。另一方面，远离血浆流动的天线，密度和离子垂直温度的径向曲线显示在等离子体 - 柱中心的固定峰，在该中心，近场的天线在空间上潮湿，但血浆（ION BERSTAIN）仍然存在坚持。 4。为了解释观察到的这种峰值现象，由于垂直于带有Cyclo-Tron频率的垂直行进波，在血浆颗粒漂移上提出了一种新的机制。成功开发了包括物理图，分析解决方案和数值分析的理论。 5。根据我们的理论，预计血浆颗粒会根据RF场的传播方向向外或 - 向外方向漂移。因此，我们继续通过在Q机器中设置天线阵列来实验证明该传输原理，在Q机器中，在该Q机器中，在该Q机器上进行了方位角模式。