【摘要】 本文给出了1986年5月在HT-6B上进行的二倍频ECR预电离实验的结果。实验观察到只要回旋共振层落在托卡马克小截面内都可获得正常放电波形;等离子体电流基本上是和环电压同时出现的;等离子体环电压下降30％左右。同时还观察到ECR预电离对减少放电初期的硬X射线和轻杂质(CⅣ)的辐射有比较明显的作用。更多还原

【Abstract】 In this paper, the results of second harmonic electron cyclotron resonance (ECR) preionization experiment on the HT-6B tokamak are reported. In the experiment, the microwave from a gyrotron (frequency 35GHz, power 15-20kW, pulse length 0.5-2ms, circularly polarised TE0.20 mode) is injected from the lower field side into the tqrus at 200μs or 400μs before the applicatipn of Ohmic heating power. Experiment results show, that ordinary discharge waveforms can be obtained as long as the ECR-layef is located inside the torus and no breakdown delay is observed. The reduction of peak loop voltage is more than 30 percent. The radiation intensity of light impurity CⅣ and hard X-ray emission are also reduced noticeably.更多还原