Absolute sensitivity calibration of vacuum and extreme ultraviolet spectrometer systems and Zeff measurement based on bremsstrahlung continuum in HL-2A tokamak

Zhou, Hangyu; Cui, Zhengying; Morita, Shigeru; Fu, Bingzhong; Goto, Motoshi; Sun, Ping; Dong, Chunfeng; Gao, Yadong; Xu, Yuan; Lu, Ping; Yang, Qingwei; Duan, Xuru
October 2012
Review of Scientific Instruments;Oct2012, Vol. 83 Issue 10, p10D507
Academic Journal
A grazing-incidence flat-field extreme ultraviolet (EUV) spectrometer has been newly developed in HL-2A tokamak. Typical spectral lines are observed from intrinsic impurities of carbon, oxygen, iron, and extrinsic impurity of helium in the wavelength range of 20 Ã…-500 Ã…. Bremsstrahlung continuum is measured at different electron densities of HL-2A discharges to calibrate absolute sensitivity of the EUV spectrometer system and to measure effective ionic charge, Zeff. The sensitivity of a vacuum ultraviolet (VUV) spectrometer system is also absolutely calibrated in overlapped wavelength range of 300 Ã…-500 Ã… by comparing the intensity between VUV and EUV line emissions.


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