【摘要】 在HT - 7托卡马克放电实验中 ,使用N∥ 谱实时可调、频率在等离子体低混杂波频率范围、功率达 15 0— 2 0 0kW的大功率微波 ,辅助托卡马克装置的加热场进行等离子体放电。在低环电压下实现了托卡马克的成功启动。使用这种方法使HT - 7装置的启动环电压由通常的 2 0V左右下降到 5V以下。这相当于实现了放电启动的最大加热场副边场强由 2 .5— 3V/m降低到 0 .6V/m左右。实验还观察到 ,在这种微波辅助低环电压启动条件下 ,气体电离过程和等离子体电流建立过程中的伏秒数的消耗、初始等离子体的辐射等一系列不同于单纯欧姆放电过程的物理现象。更多还原

【Abstract】 In HT-7 tokamak discharge experiments, the low loop voltage start-up was realized by using the changeable N ∥ spectrum LH (lower hybrid) waves to assist much low loop voltage OH (Ohmic) heating. In assistance of 200kW LH waves, the breakdown loop voltage reduced from about 20V to the value less than 5V. That is, the field strength of OH heating was reduced dramatically from 2.5-3V/m to 0.6V/m. At the same time, some phenomena related to gas ionization, plasma radiation and the consumption of OH heating volt-second number for gas ionization and current set-up were observed.更多还原