Calibration of the CHS HIBP ion beam trajectory with a gas ionization method

S. Lee, A. Fujisawa, T. P. Crowley, H. Iguchi, M. Kojima, Y. Hamada, K. Nishimura, S. Okamura, K. Matsuoka

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Abstract

A three-dimensional complex trajectory is imposed on the heavy ion beam probe (HIBP) particle orbits in heliotron/torsatron devices. A pair of two-dimensional beam deflectors for primary and secondary beam lines are equipped in the Compact Helical System (CHS) HIBP, which makes it possible to measure the plasma potential at almost all plasma radii. A plasma observation point is determined by a set of four deflector voltages. Experimental verification for these observation points is necessary in such a complex configuration. In this study, a movable detector and a gas ionization method have been used to find these deflector voltages. Calibration procedures for these methods are described in detail. The movable detector is also used to optimize the focusing condition of the primary beam in the plasma region.

Original languageEnglish
Pages (from-to)645-648
Number of pages4
JournalFusion Engineering and Design
Volume34-35
DOIs
Publication statusPublished - Mar 1997

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All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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