The tri-band high spectral resolution spectrometer with gratings in tandem for the charge-exchange recombination spectroscopy diagnostic system on HL-2A tokamak

• DOI: 10.1088/2058-6272/ad24f5
• Publication Date: 2024-02-01T22:20:50Z
• Authors: Liang 亮 LIU 刘; Deliang 德良 YU 余; Qian 倩 MA 马; Xiaofei 小斐 HE 何; Maarten DE BOCK; Manfred von HELLE...; Michael WALSH; Wenjin 文锦 CHEN 陈; Xiaoxue 小雪 HE 何; Yanling 彦玲 WEI 魏; Neng 能 ZHANG 张; Dong 栋 LI 李; Huiling 会领 WEI 魏; the HL-2A Team
• Keywords: Charge exchange; Tandem; Spectral resolution

Abstract Charge-exchange (CX) recombination spectroscopy is a powerful tool monitoring ion temperature and plasma rotation with good temporal spatial resolutions. A compact, new design for high-throughput, tri-band high spectral resolution spectrometer has been developed the charge-exchange measurement on HL-2A tokamak. The simultaneous measurements of He II (468.57 nm), C VI (529.1 D α (656.1 nm accompanied by beam emission spectra) an acquisition frequency up to 400 Hz are achieved vertically binning spectrum from each fiber in experiments. Initial results indicate that system can provide radial profiles not only velocity, but also concentration carbon. For case helium, velocity straightforward apparent associated observed CX intensity obviously too high. Modeling active feature including plume contributions needs be carried out extract true helium concentration. could become prototype ITER diagnostic pilot experiments, as presented here, demonstrate possibility impurity concentrations based combined local spectra.