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First measurement of hard x-ray spectrum emitted from high-energy electrons in electron cyclotron heated plasma of LHD

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6 Author(s)
Muto, S. ; National Institute for Fusion Science, Toki, Gifu. 509-5292, Japan ; Morita, S. ; Kubo, S. ; Shimozuma, T.
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.1538329 

Hard x-ray spectrum up to 200 keV has been successfully observed for the first time from electron cyclotron heated plasmas with an x-ray pulse-height analyzer installed on a horizontal port of Large Helical Device. A solid-state germanium detector viewing the plasma center is used as a detector. The data-acquisition system is basically operated with a high counting rate (∼64 kHz). The apparatus is equipped with a collimator and filters. The detector is supported by vibration dumpers and covered by an electrically isolated shield to avoid mechanical vibration and electromagnetic noise. The obtained hard x-ray spectrum indicates a non-Maxwellian distribution. The density of the high-energy electrons is estimated to be two orders less than the bulk electrons. © 2003 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:74 ,  Issue: 3 )

Date of Publication:

Mar 2003

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