Construction of an <inline-formula> <tex-math><?CDATA ${{\rm{H}}}_{\alpha }$?></tex-math> <mml:math> <mml:msub> <mml:mrow> <mml:mi mathvariant="normal">H</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>α</mml:mi> </mml:mrow> </mml:msub> </mml:math> <inline-graphic xmlns:xlink="https://www.w3.org/1999/xlink" xlink:href="cpb_28_10_105201_ieqn1.gif"/> </inline-formula> diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment

Construction of an

H α

diagnostic system and its application to determine neutral hydrogen densities on the Keda Torus eXperiment

Zhu Junfeng¹, Lan Tao^{1, †}, 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 Chijin^{1, 2}, Ding Weixing¹, Liu Wandong¹

The ultra-low q discharge on KTX at 3.8 ms: (a) the brightness for 10-channel H α signals; (b) profile of H α emissivity γ α ( r ) ; (c) profile of neutral density n N ( r ) .