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由于真空室的屏蔽作用 ,当极向磁场变化时等离子体区域的磁场不能随极向磁场同时变化 ,环电压的建立存在一增长过程。研究结果表明 ,环电压延迟的时间常数与真空室的等效时间常数一致。在真空室等效时间常数确定的情况下 ,可以确定环电压上升过程。HT- 7U装置环电压建立过程大约需要 2 0 ms
Due to the shielding effect of the vacuum chamber, the magnetic field in the plasma region can not change at the same time with the polar magnetic field when the poloidal magnetic field changes. There is an increasing process of the ring voltage. The results show that the time constant of the ring voltage delay is consistent with the equivalent time constant of the vacuum chamber. With the equivalent time constant of the vacuum chamber determined, the ring voltage rise can be determined. The HT-7U device’s ring voltage build-up process takes about 20 ms