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Study on RF Tandem Mirror

射频串联镜研究

基本信息

批准号：
62420051
负责人：
ITATANI Ryohei
金额：
$ 11.78万
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 (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62420051/
关键词：
Tandem Mirror Ion Cyclotron Heating Helicon Wave Ion Hybrid Resonance MHD Stability Potential Confinement Thermal Barrier タンデムミラー MHD安定化 RF安定化

项目摘要

The main purpose of the RF tandem mirror project is to demonstrate plasma confinement in purely axisymmetric magnetic field configuration by using ICRF power only. We have revealed that the plasma production, MHD-stabilization, ion heating, and plug and thermal barrier potential formation can all be achieved by a combination of the central RF and the plug RF.The highest peak density produced by the helicon/fast wave excited by the central RF is 1.8X10^<13>cm^<-3> with the beta value of - 10 % for helium plasma. In a two-ion-species plasma, ion temperatures of Ti_1 - 220 eV have been achieved at densities of 0.4x10^<13>cm^<-3>. This heating is due to the mode conversion of the helicon/fast wave into the slow Alfven wave at the hybrid resonance. The plasma is MHD-stable due to the RF ponderomotive effect. The central RF produces the potential dip at the plug midplane. This dip is formed by the sloshing ion distribution created by the minority ion heating in the plug cell. The plug potential phi c of 60- 80V is observed resulting in reduced end loss flux. The axial confinement time is improved by a factor of 2-3. By the additional application of the plug RF, the thermal barrier potential of phi B - 90 V is created with phi c - 100 V. The value of phi B increases with the plug RF power. it is likely that the barrier pumping is provided by the non-ambipolar ion convection driven by the azimuthal ponderomotive force of the plug cell RF.

RF串联镜项目的主要目的是演示仅使用ICRF功率的纯轴对称磁场配置中的等离子体约束。中心射频和塞射频的结合可以实现等离子体的产生、MHD稳定、离子加热、塞势和热垒势的形成，中心射频激发的螺旋波/快波产生的最高峰密度为1.8 × 10 ~（13）<13>cm ~ 2<-3>，β值为-10%。在双离子种类等离子体中，在0.4 × 10 - 4 cm-3的密度下已经实现了Ti-1 - 220 eV的离子温度<13><-3>。这种加热是由于在混合谐振下螺旋波/快波到慢阿尔芬波的模式转换。由于RF有质动力效应，等离子体是MHD稳定的。中心RF在插头中平面处产生电位骤降。这种下降是由插入式单元中的少数离子加热产生的晃动离子分布形成的。观察到60- 80 V的插塞电位，导致减少的端部损失通量。轴向约束时间提高了2-3倍。通过附加施加插头RF，用phi c - 100 V产生了phi B - 90 V的热障电势。phi B的值随着插头RF功率而增加。可能的是，势垒泵送由插塞单元RF的方位角有质动力驱动的非双极离子对流提供。