Spectral Analysis in EUV Range for Study of Core Impurity Behavior in HL-2A

ZHOU Hangyu(周航宇); CUI Zhengying(崔正英); MORITA Shigeru(森田繁); FU Bingzhong(傅炳忠); GOTO Motoshi(後藤基志); SUN Ping(孙平); FENG Beibin(冯北滨); CUI Xuewu(崔学武); LU Ping(卢平); YANG Qingwei(杨青巍); DUAN Xuru(段旭如)

doi:10.1088/1009-0630/16/2/01

Plasma Science and Technology > 2014 > 16(2): 89-92. > DOI: 10.1088/1009-0630/16/2/01

ZHOU Hangyu(周航宇), CUI Zhengying(崔正英), MORITA Shigeru(森田繁), FU Bingzhong(傅炳忠), GOTO Motoshi(後藤基志), SUN Ping(孙平), FENG Beibin(冯北滨), CUI Xuewu(崔学武), LU Ping(卢平), YANG Qingwei(杨青巍), DUAN Xuru(段旭如). Spectral Analysis in EUV Range for Study of Core Impurity Behavior in HL-2A[J]. Plasma Science and Technology, 2014, 16(2): 89-92. DOI: 10.1088/1009-0630/16/2/01

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Spectral Analysis in EUV Range for Study of Core Impurity Behavior in HL-2A

1 Southwestern Institute of Physics, Chengdu 610041, China 2 National Institute for Fusion Science, Toki 509-5292, Gifu, Japan

Funds: supported partially by National Natural Science Foundation of China (Nos.11175061 and 11375057), and the JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC: No.11261140328)

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Received Date: August 20, 2013

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Extreme ultraviolet (EUV) spectroscopy has been developed for impurity diagnostics in HL-2A tokamak. The EUV spectrometer consists of an entrance slit, a holographic varied-line- space (VLS) grating, a back-illuminated charge-coupled device (CCD) and a laser light source for optical alignment. Spectral lines in wavelength region of 20-500 ? A observed from HL-2A plasmas were analyzed to study the impurity behavior. Spectral and temporal resolutions used for the analysis were 0.19 Å at CV (2×33.73 Å) and 6 ms, respectively. It was found that carbon, oxygen and iron impurities were usually dominant in the HL-2A plasma. They almost disappeared when the siliconization was carried out. Although the EUV spectra were entirely replaced by the silicon emissions just after the siliconization, the emissions were considerably decreased with accumulation of discharges. Aluminum and neon were externally introduced into the HL-2A plasma based on laser blow-off (LBO) and supersonic molecular beam injection (SMBI) techniques for a trial of the impurity transport study, respectively. The preliminary result is presented for time behavior of EUV spectral lines.
- EUV spectroscopy,
- EUV spectra,
- LBO,
- SMBI

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