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

Hangyu Zhou; Zhengying Cui; Shigeru Morita; Bingzhong Fu; Motoshi Goto; Ping Sun; Chunfeng Dong; Yadong Gao; Yuan Xu; Ping Lu; Qingwei Yang; Xuru Duan

doi:10.1063/1.4729671

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

Rev Sci Instrum. 2012 Oct;83(10):10D507. doi: 10.1063/1.4729671.

Authors

Hangyu Zhou¹, Zhengying Cui, Shigeru Morita, Bingzhong Fu, Motoshi Goto, Ping Sun, Chunfeng Dong, Yadong Gao, Yuan Xu, Ping Lu, Qingwei Yang, Xuru Duan

Affiliation

¹ Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China. zhouhy@swip.ac.cn

PMID: 23126850
DOI: 10.1063/1.4729671

Abstract

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 Å-500 Å. 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, Z(eff). The sensitivity of a vacuum ultraviolet (VUV) spectrometer system is also absolutely calibrated in overlapped wavelength range of 300 Å-500 Å by comparing the intensity between VUV and EUV line emissions.