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

doi:10.1063/1.4939032

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 journal › Article › peer-review

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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 H_α (λ = 656.3 nm), that are connected to the entrance slit of the spectrometer to eliminate the interference between the HeII and the H_α 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 language	English
Article number	123514
Journal	Review of Scientific Instruments
Volume	86
Issue number	12
DOIs	https://doi.org/10.1063/1.4939032
Publication status	Published - Dec 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.4939032

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

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.",

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

note = "Funding Information: We would like to thank LHD Experiment Group and the technical staff of LHD for their effort to support the experiment in LHD. This work is partly supported by a Grant-in-Aid for Specially Promoted Research (No. 21224014) and a Grant-in-Aid for Scientific Research (No. 23246164) of JSPS Japan. This work is also partly supported by the National Institute for Fusion Science grant administrative budget, No. NIFS10ULHH021. Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = dec,

doi = "10.1063/1.4939032",

language = "English",

volume = "86",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics Publising LLC",

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T1 - Measurement of radial profiles of density ratio of helium to hydrogen ion using charge exchange spectroscopy with two-wavelength spectrometer

AU - Ida, K.

AU - Yoshinuma, M.

AU - Wieland, B.

AU - Goto, M.

AU - Nakamura, Y.

AU - Kobayashi, M.

AU - Murakami, I.

AU - Moon, C.

N1 - Funding Information: We would like to thank LHD Experiment Group and the technical staff of LHD for their effort to support the experiment in LHD. This work is partly supported by a Grant-in-Aid for Specially Promoted Research (No. 21224014) and a Grant-in-Aid for Scientific Research (No. 23246164) of JSPS Japan. This work is also partly supported by the National Institute for Fusion Science grant administrative budget, No. NIFS10ULHH021. Publisher Copyright: © 2015 AIP Publishing LLC.

PY - 2015/12

Y1 - 2015/12

N2 - 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.

AB - 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.

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

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