Premium
Deuterium atomic density estimation in recombining plasmas using self‐absorption spectroscopy
Author(s) -
Kajita Shin,
Nishiwaki Toshihiro,
Ohno Noriyasu,
Sawada Keiji,
Takagi Makoto
Publication year - 2013
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.21784
Subject(s) - divertor , atomic physics , balmer series , deuterium , plasma , wavelength , absorption (acoustics) , spectrometer , extreme ultraviolet , plasma diagnostics , spectroscopy , radiation trapping , absorption spectroscopy , radiation , chemistry , laser , emission spectrum , optics , physics , tokamak , spectral line , nuclear physics , quantum mechanics , astronomy
Deuterium atomic density in the divertor region of fusion reactors is an important parameter. In this study, atomic density is estimated in the divertor simulator NAGDIS‐T by use of an absorption effect of Lyman‐ β , of which the wavelength is in the vacuum ultraviolet (VUV). The calibration of the spectrometer in the VUV wavelength was performed by using a branching ratio method. The intensity ratio of Lyman‐ β to Balmer‐ α significantly decreased in detached plasmas because of radiation trapping. The atomic density was estimated by use of self‐absorption effect. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.