[Table of Contents]

Plasma and Fusion Research

Volume 8, 2401087 (2013)

Regular Articles

Charge Fraction Measurements for Heavy Particle Beams Generated by the Tandem Accelerator with MCP System
Akira TANIIKE, Tomoaki SHINOBU, Sho MOCHIZUKI, Takeshi IDO1), Akihiro SHIMIZU1), Masaki NISHIURA1) and Yuichi FURUYAMA
Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe 658-0022, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 21 November 2012 / Accepted 8 May 2013 / Published 15 August 2013)

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.

Keywords

Au− ion beam, gas cell, ionization, tandem accelerator, HIBP, LHD, MCP

DOI: 10.1585/pfr.8.2401087

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References

  • [1] T. Ido et al., Rev. Sci. Instrum. 77, 10F523 (2006).
  • [2] T. Ido et al., J. Plasma Fusion Res. 86, 507 (2010).
  • [3] M. Nishiura et al., Rev. Sci. Instrum. 79, 02C713 (2008).
  • [4] A. Taniike et al., Fusion Eng. Des. 34-45, 675 (1997).
  • [5] A. Taniike et al., Plasma Fusion Res. 5, S2087 (2010).
  • [6] A. Taniike et al., Rev. of the Faculty of Mar. Sci., Kobe Univ. 8 (2011).
  • [7] M.M. Sant' Anna et al., Plasma Phys. Control. Fusion 51, 045007 (2009).
  • [8] A. Taniike et al., NIFS Report, NIFS-352 (1995).
  • [9] M. Nishiura et al., NIFS Report, NIFS-884 (2008).

This paper may be cited as follows:

Akira TANIIKE, Tomoaki SHINOBU, Sho MOCHIZUKI, Takeshi IDO, Akihiro SHIMIZU, Masaki NISHIURA and Yuichi FURUYAMA, Plasma Fusion Res. 8, 2401087 (2013).