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Development of a Wide Band and Compact X-Ray Crystal Spectrometer for Iron Charge State Distribution Measurement on LHD

Ikuya SAKURAI, Yuzuru TAWARA, Chiho MATSUMOTO, Akihiro FURUZAWA, Shigeru MORITA¹⁾ and Motoshi GOTO¹⁾

EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan

1)

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 4 December 2006 / Accepted 2 April 2007 / Published 20 November 2007)

Abstract

A wide band and compact X-ray spectrometer has been developed using a Johan-type crystal and a back-illuminated CCD detector for charge state distribution measurement of highly ionized iron in LHD. In order to observe all charge states of iron ions a curved crystal of LiF(220) with a curvature of 430 mm was selected for the spectrometer. A wide energy range of 6.4-7.0 keV could be observed with use of CCD detector in a size of 26.6 × 6.7 mm² . An energy resolution of the spectrometer was 10 eV at full width at half maximum (FWHM). Time-developed Fe Kα spectra were thus measured with a time interval of 10 ms in the full binning mode of the CCD. The charge states from Fe ions of FeXXI to FeXXV were clearly observed, but FeXXVI has not been observed. In the next step, then, the charge state distribution measurement is focused on the measurement of FeXXI-XXV and a quartz(2023) curved crystal is selected to measure the energy range of 6.40-6.75 keV. The expected energy resolution is 4 eV at 6.7 keV for the quartz crystal, which is enough for further analysis of the iron charge state distribution.

Copyright (c) 2007 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

X-ray crystal spectrometer, Johan-type crystal spectrometer, iron Kα

DOI: 10.1585/pfr.2.S1068

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References

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This paper may be cited as follows:

Ikuya SAKURAI, Yuzuru TAWARA, Chiho MATSUMOTO, Akihiro FURUZAWA, Shigeru MORITA and Motoshi GOTO, Plasma Fusion Res. 2, S1068 (2007).