Plasma Potential Formation Due to Local ECR

局部 ECR 导致的血浆电势形成

基本信息

批准号：
07458089
负责人：
HATAKEYAMA Rikizo
金额：
$ 4.99万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07458089/
关键词：
Local ECR Plasma Potential Formation Barrier Potential フラズマ電位形成

项目摘要

Plasma potential formation is investigated in a fully-ionized collisionless plasma flow in the presence of an electron cyclotron resonance (ECR) point under simple mirror configurations of magnetic field. The magnetic-well, converging-field and diverging-field configurations are generated in the single-ended Q machine.When ECR takes place at the magnetic-well bottom, a potential strucature is observed to consist of a negative potential depression around the ECR point and a subsequent positive potential peak. This potential structure gradually collapses in the time scale determined by the ion-flow speed, during which low-frequency drift and flute instabilities are observed to grow intensively. In the case of a converging magnetic field such a potential structure is observed to persist in the steady state when the ECR point is located in the region of good magnetic-field curvature. But, this structure is formed only transiently when the ECR point is located in the region of bad magnetic-field curvature. Thus, the formation of an ion plug and electron thermal-barrier potential is demonstrated in the presence of the ECR point under simple configurations of magnetic mirror field, being different from the original scenario for the tandem-mirror plasma confinement. When ECR takes place in a diverging magnetic field, on the other hand, there appears a strong potential drop along the field lines, which results from a field-aligned electron acceleration, being accompanied by an effective ion acceleration.The potential formations described above are explained by the selective electron-deceleration/acceleration parallel to the field lines due to ECR and electrostatic ion-deceleration/acceleration self-consistently organized due to the condition of quasineutrality.

在磁场的简单镜像配置下，在存在电子回旋共振（ECR）点的情况下，在完全离子的无碰撞血浆流中研究了血浆电位的形成。单端Q机中产生了磁性孔，融合场和发散场构型。当ECR发生在磁性孔底部时，观察到潜在的诱形，由ECR点周围的负电势抑制作用。以及随后的正势峰。这种潜在的结构逐渐在由离子流速度确定的时间尺度上崩溃，在此期间，观察到低频漂移和长笛不稳定性会强烈增长。在收敛的磁场的情况下，当ECR点位于良好的磁场曲率区域时，观察到潜在的结构在稳定状态下持续。但是，仅当ECR点位于不良磁场曲率区域时，这种结构才会瞬时形成。因此，在ECR点的存在下，在磁性镜场的简单配置下，在ECR点的存在下证明了离子塞和电子热屏障电势的形成，与串联液等离子体限制的原始场景不同。另一方面，当ECR发生在发散的磁场中时，沿场线的电势下降，这是由现场对准的电子加速度造成的，并伴有有效的离子加速度。由于ECR和静电离子 - 定位/加速度，由于准静电而与现场线平行的选择性电子 - 偏置/加速度，由于准化的条件而自愿组织。