Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Charge Fraction Measurements for Heavy Particle Beams Generated by the Tandem Accelerator with MCP System
Akira TANIIKETomoaki SHINOBUSho MOCHIZUKITakeshi IDOAkihiro SHIMIZUMasaki NISHIURAYuichi FURUYAMA
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2013 Volume 8 Pages 2401087

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Abstract

In order to expand the applied range of the heavy ion beam probe measurement on LHD, it is important to increase the probing beam current. A method of increasing the current is the improvement of charge exchange efficiency of a gas cell. The experiments were carried out on a tandem accelerator at Kobe University, 5SDH-2, because various conditions of experiments can be selected for gas species, gas pressure, and ion energy. Charge fractions of negative ion, neutral atom and the positive ions were measured by a micro channel plate or Faraday cup. Dependence of the fractions of Au, Au0, Au+ and Au2+ on gas thickness was measured. Results were compared with prior calculations, and a solution of rate equations. The cross sections for ionizing and electron capture were calculated, and some cross sections were obtained from experiments. The dependence of charge fractions for Au0, Au+ and Au2+ on the gas thickness was well presented.

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© 2013 by The Japan Society of Plasma Science and Nuclear Fusion Research
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