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Fusion Science and Technology Volume 58, 2010 - Issue 1: Special Issue on Large Helical Device (LHD)
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Chapter 8. Diagnostics

Charge-Exchange Spectroscopy with Pitch-Controlled Double-Slit Fiber Bundle on LHD

M. YoshinumaNational Institute for Fusion Science, Toki, Gifu 509-5292, Japan
,
K. IdaNational Institute for Fusion Science, Toki, Gifu 509-5292, Japan
,
M. YokoyamaNational Institute for Fusion Science, Toki, Gifu 509-5292, Japan
,
M. OsakabeNational Institute for Fusion Science, Toki, Gifu 509-5292, Japan
&
K. NagaokaNational Institute for Fusion Science, Toki, Gifu 509-5292, Japan
Pages 375-382 | Published online: 07 Apr 2017
 
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Abstract

The systems of charge-exchange spectroscopy (CXS) have been improved on the Large Helical Device (LHD). Pitch-controlled fiber bundles give faster readout time, and double-slit fiber bundles increase the number of channels that can be obtained with a single charge-coupled device detector. The evolutions of ion temperature with a sampling time of 10 ms are obtained, and profiles of ion temperature, toroidal rotation velocity, and density of carbon impurity with data at 51 spatial points are measured with the improved CXS systems.

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