Plasma and Fusion Research

Volume 14, 1402079 (2019)

Regular Articles

Verification of Carbon Density Profile Measurements with Charge Exchange Spectroscopy Using Hydrogen and Deuterium Neutral Beams
Katsumi IDA1,2), Mikirou YOSHINUMA1,2), Tatsuya KOBAYASHI1,2), Yutaka FUJIWARA1), Jun CHEN3), Izumi MURAKAMI1,2), Masashi KISAKI1,2), Masaki OSAKABE1,2) and LHD Experiment Group1)
1)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki, Gifu 509-5292, Japan
2)
SOKENDAI (The Graduate University for Advanced Studies), Toki, Gifu 509-5292, Japan
3)
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
(Received 6 February 2019 / Accepted 23 March 2019 / Published 25 April 2019)

Abstract

Verification of carbon density profile measurements with charge exchange spectroscopy of CVI (Δn = 8 - 7, λ = 529.2 nm) using hydrogen and deuterium neutral beams is described. This is a key issue in the study of the comparison of the carbon density profile between hydrogen and deuterium plasma, because the hydrogen neutral beams are injected in the hydrogen plasma and the deuterium neutral beams are injected in the deuterium plasma. By applying the precise beam attenuation calculation using precise atomic data, identical carbon density profile is obtained for the plasma with hydrogen beam and deuterium beam. A Verification of the measurement is performed by comparison of carbon density profile measured with charge exchange spectroscopy and increment of electron density profile just after the carbon pellet injection.

Keywords

charge exchange spectroscopy, carbon density profile, helical plasma

DOI: 10.1585/pfr.14.1402079

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