Lithium beam probe for edge density profile measurements on the large helical device

A 30 keV lithium beam probe system to measure edge density and its fluctuation has been developed on the large helical device (LHD) and has just started its operation. On a test setup relevant to LHD conditions, the equivalent beam current ∼0.1 mA was obtained without the unfavorable beam divergence...

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Bibliographic Details
Published in:Review of Scientific Instruments 2003-03, Vol.74 (3), p.1865-1868
Main Authors: Morisaki, T., Komori, A., Motojima, O.
Format: Article
Language:English
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Summary:A 30 keV lithium beam probe system to measure edge density and its fluctuation has been developed on the large helical device (LHD) and has just started its operation. On a test setup relevant to LHD conditions, the equivalent beam current ∼0.1 mA was obtained without the unfavorable beam divergence, in spite of a long distance more than 6 m from the injector. In the preliminary experiments in LHD, it was found that the beam penetrates up to ρ∼0.8 (ρ:normalized minor radius). By using the electrostatic deflection plates coupled with an in situ beam position monitor, the probe system operation is available, without the magnetic field shield, under the flexible experimental conditions with various magnetic field configurations.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1538343