title: First measurements of highly ionized impurity emission distribution by grazing-incidence flat-field extreme ultraviolet spectrometer in HL-2A.
abstract: A space-resolved grazing-incidence flat-field extreme ultraviolet (EUV) spectrometer has been developed in the HL-2A tokamak to measure vertical impurity emission profiles with simultaneous spectral, temporal, and spatial resolution. The spectrometer working in the wavelength range of 30-500 Å has been equipped with a gold-coated varied-line-spacing holographic grating with curvature of 5606 mm and a back illuminated charge-coupled device with size of 6.6 × 26.6 mm(2) (255 × 1024 pixels). A lower half of the HL-2A plasma with averaged minor radius of 40 cm is observed when the spectrometer with horizontal dispersion is placed at a distance of 7.5 m away from the plasma center. An excellent spatial resolution of 12 mm is achieved when a space-resolved slit with vertical width of 0.5 mm is adopted. The radial profiles of intrinsic impurities in several ionization stages have been measured with high throughput and extremely low stray light.
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Zhengying
authors.initials: Z
authors.lastname: Cui
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Chunfeng
authors.initials: C
authors.lastname: Dong
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Hangyu
authors.initials: H
authors.lastname: Zhou
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Morita
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Sun
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Bingzhong
authors.initials: B
authors.lastname: Fu
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Lu
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Xuantong
authors.initials: X
authors.lastname: Ding
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Qingwei
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China.
authors.forename: Xuru
authors.initials: X
authors.lastname: Duan