Electron Heating and Potential Formation due to Mode Conversion of ICRF Fast Waves

ICRF 快波模式转换导致的电子加热和电势形成

基本信息

批准号：
04452312
负责人：
YASAKA Yasuyoshi
金额：
$ 2.75万
依托单位：
KYOTO 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：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452312/
关键词：
tandem mirror ICRF wave axial potential formation axial confinement velocity space diffusion radial confinement high beta 電子加熱静電波リミタバイアス

项目摘要

Effects of an ICRF wave injected into the central cell for formation of the ion confining potential were investigated in the HIEI tandem mirror. Measurements on wave propagation revealed that the fast magnetosonic wave propagating into the plug cell converts into an electrostatic wave with resonance phenomenon when it encounters the ion-ion hybrid resonance layr from the high-field side. In this case, rise of electron temperature in the plug cell was observed in the measurement on intensities of atomic emission lines. Simultaneously, measurements by the end loss energy analyzer showed that the ion confining potential (- 70 V) is formed. The axial particle confinement time was found to increase by a factor of 3-4, which leads to reduction of the end ion loss and density increase in the central cell. The mechanism of potential formation would be the velocity space diffusion of electrons by ICRF waves.In the combination of such an improved axial confinement and the improved radial confinement by the limiter biasing (Physical Review Letters, Vol.70(1993)pp.4071-4074), a plasma with high temperature (ion temperature : 0.1 keV) and high density (10^<13>cm^<-3>) was realized, where the beta valuereaches - 14%. The global energy confinement time increases by a factor of -4, where the axial and radial energy confinement times increase by a factor of 3.8 and 4.0, respectively. The production of such a high-beta plasma results from the enhancement on the global confinement. This high-beta plasma is sustained within the stability criteria by ponderomotive force of propagating ICRF electric fields.We have concluded that electron heating and potential formation due to mode conversion of the ICRF fast wave is effective on the enhancement on confinement of a tandem mirror.

在HIEI串联镜中研究了注入中央细胞形成离子限制电势的ICRF波的影响。波传播的测量结果表明，当从高场面遇到离子 - 离子混合谐振路线时，快速磁波传播到插头电池中，带有共振现象转化为静电波。在这种情况下，在原子发射线的强度测量中观察到了塞细胞中电子温度的升高。同时，通过最终损耗能量分析仪的测量表明，形成了离子限制电势（-70 V）。发现轴向颗粒的限制时间增加了3-4倍，从而导致端离子损耗降低和中心细胞的密度增加。潜在形成的机制将是ICRF波的速度空间扩散。在这种改进的轴向限制和限制器偏置的改进的径向限制的结合中（物理审查Letters，第70卷（1993年），PP.4071- pp.4071--pp.4071-- 4074），具有高温（离子温度：0.1 keV）和高密度（10^<13> cm^<-3>）的等离子体，其中Beta valuereaches -14％。全球能量限制时间增加了-4倍，其中轴向和径向能量限制时间分别增加了3.8和4.0。这种高β等离子体的产生是由于全球限制的增强而产生的。这种高β等离子体在传播ICRF电场的蓬勃发展力量中持续在稳定性标准中。我们得出的结论是，由于ICRF快速波的模式转换而引起的电子加热和电势形成对于增强了串联镜子的限制是有效的。