Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy

K Ida; M Yoshinuma; K Yamasaki; T Kobayashi; Y Fujiwara; J Chen; I Murakami; S Satake; Y Yamamoto; S Murakami; M Kobayashi

doi:10.1063/1.5097030

Measurements of radial profile of hydrogen and deuterium density in isotope mixture plasmas using bulk charge exchange spectroscopy

Rev Sci Instrum. 2019 Sep;90(9):093503. doi: 10.1063/1.5097030.

Authors

K Ida¹, M Yoshinuma¹, K Yamasaki², T Kobayashi¹, Y Fujiwara¹, J Chen³, I Murakami¹, S Satake¹, Y Yamamoto⁴, S Murakami⁴, M Kobayashi¹

Affiliations

¹ National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu 509-5292, Japan.
² Research Institute for Applied Mechanics Kyushu University, Kasuga, Fukuoka, Japan.
³ School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China.
⁴ Department of Nuclear Engineering, Kyoto University, Kyoto 615-8450, Japan.

PMID: 31575284
DOI: 10.1063/1.5097030

Abstract

A bulk charge exchange spectroscopy system has been applied to measure the radial profiles of the hydrogen (H) and deuterium (D) density ratio in the isotope mixture plasma in a large helical device. Charge exchange lines of H_α and D_α are fitted by 4 Gaussian of H and D cold components and H and D hot components with 5 parameters by combining the measurement of plasma toroidal rotation velocity with carbon charge exchange spectroscopy. The radial profiles of the relative density of hydrogen and deuterium ions are derived from H and D hot components measured and the beam density calculated from beam attenuation calculation. A proof-of-principle experiment is performed by the H pellet and the D pellet injections into the H-D mixture plasma.