Measurement of radial profiles of density ratio of helium to hydrogen ion using charge exchange spectroscopy with two-wavelength spectrometer

K. Ida, M. Yoshinuma, B. Wieland, M. Goto, Y. Nakamura, M. Kobayashi, I. Murakami, C. Moon

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9 Citations (Scopus)

Abstract

Radial profiles of density ratio of helium to hydrogen ions are measured using the charge exchange spectroscopy technique with the two-wavelength spectrometer system in the large helical device. The two-wavelength spectrometer system consists of a dichroic mirror box, a spectrometer with two grating and two camera lenses, and one CCD detector. The dichroic mirror box is used to divide the light of one fiber from the plasma to two fibers, one for HeII (λ = 468.6 nm) and the other for Hα (λ = 656.3 nm), that are connected to the entrance slit of the spectrometer to eliminate the interference between the HeII and the Hα spectra on the CCD. This system provides a simultaneous measurement of helium and hydrogen ion density ratio at 8 exact same locations (8 spatial channels) with a time resolution of >40 ms in the wide range of the density ratio of 0.05-5.

Original languageEnglish
Article number123514
JournalReview of Scientific Instruments
Volume86
Issue number12
DOIs
Publication statusPublished - Dec 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation

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