Spectroscopic Diagnostics of Tokamak Plasma Heating by High Power Microwave

高功率微波托卡马克等离子体加热的光谱诊断

基本信息

批准号：
02044103
负责人：
ODA Toshiatsu
金额：
$ 6.21万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

1. We have developed a diagnostic system using laser-aided particle-probe spectroscopy (LAPPS) to measure the high power microwave (>1 GW) generated by a free electron laser (FEL) beam for the ECH study in the Microwave Tokamak Experiment (MTX) at the Lawrence Livermore National Laboratory. In this diagnostics we observe flourescences induced by the forbidden transitions due to the Stark effect from the helium metastable atoms to determine the electric field strength in the plasma.2. We designed the diagnostic apparatus after detailed discussions about the specifications of the apparatus. It consists of a neutral helium beam (50keV, 0.2A), a excimer-laser excited dye laser exciting the neutral beam, and a spectroscopic system with two channels of light detector.3. In the assembled apparatus, we have measured the triplet metastable atom density in the LAPPS helium beam. To avoid stray light due to the laser (389 nm, 2^3S*3^3P), we also observed a cascade flourescence (706 nm, 3^3S*2^3S) … More to measure the matastable atom density.4. We measured the vxB field by raising the forbidden transition (2^3S*3^3D) due to the motional Stark effect when the 45-keV helium beam crossed the MTX magnetic field (the calculated field was 96 kV/cm) to calibrate the FEL electric field measurements.5. We measured the FEL electric-field in vacuum by a similar way as for the vxB field measurement except that we had to extract large background light produced by a wide-wavelength-band light burst that occurred when the FEL pulse reached the MTX tokamak. This is the first time to measure the high power FEL electric-field in the center of tokamak chamber, and the measured result (200 kV/cm) is helpful as a standard to measure the FEL absorption in the plasma.6. Because of time constraints caused by long elapse for the development of FEL, the measurement of the FEL electric-field in the MTX plasma was not made. In conclusion, our Joint Research was fruitful in that we developed the diagnostic system as the first time to measure the electric field in the tokamak plasma and observed the high power microwave of an order of 1 GW. Less

1。我们已经使用激光探针光谱（LAPS）开发了一个诊断系统，以通过自由电子激光器（FEL）束测量高功率微波（> 1 gW）D，以在微波炉tokamak实验（MTX）进行ECH研究Livermore国家实验室在这种诊断中，我们观察到由禁止的液化剂，以确定血浆中的电场。 50kev，0.2a）M和一个具有两个光通道的光谱系统。3在组装的设备中，我们测量了在Lapps的氦束上的亚稳态。 3s*3p）提供了级联粉（706 nm，3^3s*2^3s）…更多用于测量肥大的原子密度。 Al Stark效应当45击氦束穿越MTX磁场（计算出的场是96 kV/cm）以校准FEL电场测量值。5。提取宽波长的光线爆发产生的大型背景光。血浆中的FEL吸收6。 1 GW