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

Research output: Contribution to journalArticle

8 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 1 2015
Externally publishedYes

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ion charge
hydrogen ions
charge exchange
Helium
Spectrometers
Ion exchange
helium
Spectroscopy
spectrometers
Wavelength
Hydrogen
Ions
profiles
Charge coupled devices
wavelengths
spectroscopy
boxes
charge coupled devices
Mirrors
mirrors

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Measurement of radial profiles of density ratio of helium to hydrogen ion using charge exchange spectroscopy with two-wavelength spectrometer. / Ida, K.; Yoshinuma, M.; Wieland, B.; Goto, M.; Nakamura, Y.; Kobayashi, M.; Murakami, I.; Moon, C.

In: Review of Scientific Instruments, Vol. 86, No. 12, 123514, 01.12.2015.

Research output: Contribution to journalArticle

Ida, K. ; Yoshinuma, M. ; Wieland, B. ; Goto, M. ; Nakamura, Y. ; Kobayashi, M. ; Murakami, I. ; Moon, C. / Measurement of radial profiles of density ratio of helium to hydrogen ion using charge exchange spectroscopy with two-wavelength spectrometer. In: Review of Scientific Instruments. 2015 ; Vol. 86, No. 12.
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AU - Kobayashi, M.

AU - Murakami, I.

AU - Moon, C.

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