Potential measurements with heavy ion beam probe system on LHD

A. Shimizu, T. Ido, S. Nakamura, K. Toi, M. Nishiura, S. Kato

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Abstract

The heavy ion beam probe system in the Large Helical Device (LHD) was improved as follows. At first, the additional new sweeper was installed into the diagnostic port to extend the observable region. By using this sweeper, the potential profile was measured in a wider minor radius range than in previous experiments, in the case of outward shifted magnetic configuration of LHD. Next, the real time control system was installed to control the probe beam orbit for measuring the potential in plasma with large plasma current. In this system, a digital signal processor was used to control the probe beam in real time. The system worked well in the fixed position observation mode. In the sweeping mode for profile measurement, this control system became unstable. The details of this system and the experimental results are reported in this article.

Original languageEnglish
Article number10E138
JournalReview of Scientific Instruments
Volume81
Issue number10
DOIs
Publication statusPublished - Oct 1 2010

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All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

Shimizu, A., Ido, T., Nakamura, S., Toi, K., Nishiura, M., & Kato, S. (2010). Potential measurements with heavy ion beam probe system on LHD. Review of Scientific Instruments, 81(10), [10E138]. https://doi.org/10.1063/1.3491317