title: Absolute sensitivity calibration of vacuum and extreme ultraviolet spectrometer systems and Z(eff) measurement based on bremsstrahlung continuum in HL-2A tokamak.
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.
authors.affiliation: Southwestern Institute of Physics, PO Box 432, Chengdu 610041, China. zhouhy@swip.ac.cn
authors.forename: Hangyu
authors.initials: H
authors.lastname: Zhou
authors.forename: Zhengying
authors.initials: Z
authors.lastname: Cui
authors.forename: Shigeru
authors.initials: S
authors.lastname: Morita
authors.forename: Bingzhong
authors.initials: B
authors.lastname: Fu
authors.forename: Motoshi
authors.initials: M
authors.lastname: Goto
authors.forename: Ping
authors.initials: P
authors.lastname: Sun
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Dong
authors.forename: Yadong
authors.initials: Y
authors.lastname: Gao
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.forename: Qingwei
authors.initials: Q
authors.lastname: Yang
authors.forename: Xuru
authors.initials: X
authors.lastname: Duan