Construction of an H α diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment
Zhu Junfeng1, Lan Tao1, †, Zhuang Ge1, Deng Tijian1, Wu Jie1, Xu Hangqi1, Chen Chen1, Zhang Sen1, Wu Jiaren1, Zu Yiming1, Li Hong1, Xie Jinlin1, Liu Ahdi1, Liu Zixi1, Wu Zhengwei1, Wang Hai1, Wen Xiaohui1, Zhou Haiyang1, Xiao Chijin1, 2, Ding Weixing1, Liu Wandong1
       

Waveforms for an ultra-low q discharge on KTX: (a) plasma current Ip; (b) loop voltage Vloop; (c) ten-channel H α signals.