Plasma Transport Induced by Cyclotron Resonance

我们得到了以下关于非均匀或行射频场（rf）诱导等离子体输运的结果。1. 理论上发现，在径向递增的轴对称射频场作用下，等离子体粒子沿径向向外漂移。2. 这在q机实验中得到了证明，在离子回旋加速器频率周围的电磁场由多圈环形天线（m=0）感应激发。天线附近的等离子体轮廓随着施加的射频周期周期性地改变为大部分的尖峰和空心。等离子体的大规模膨胀和压缩最终导致了向外辐射的离子漂移，导致了高能离子与天线的碰撞。3. 另一方面，在远离天线的等离子体流方向上，密度和离子垂直温度的径向分布在等离子体柱中心显示出稳定的峰值，天线近场在空间上受到阻尼，但等离子体（离子伯斯坦波）仍然存在。4. 为了解释这种峰化现象，提出了一种由垂直行波引起的等离子体粒子漂移的新机制。成功地发展了包括物理图像、解析解和数值分析在内的理论。5. 根据我们的理论，预计等离子体粒子沿径向向外或向内漂移，这取决于射频场的传播方向。因此，我们继续通过在Q-machine中设置天线阵列来实验证明这种传输原理，其中行波的方位角模式是外部控制的。

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.