2D spatial profile measurements of potential fluctuation with heavy ion beam probe on the Large Helical Device

A. Shimizu, T. Ido, M. Nishiura, S. Kato, K. Ogawa, H. Takahashi, H. Igami, Y. Yoshimura, S. Kubo, T. Shimozuma

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Two-dimensional spatial profiles of potential fluctuation were measured with the heavy ion beam probe (HIBP) in the Large Helical Device (LHD). For 2D spatial profile measurements, the probe beam energy has to be changed, which requires the adjustment of many deflectors in the beam transport line to optimize the beam trajectory, since the transport line of LHD-HIBP system is long. The automatic beam adjustment system was developed, which allows us to adjust the beam trajectory easily. By analyzing coherence between potential fluctuation and magnetic probe signal, the noise level of the mode power spectrum of the potential fluctuation can be reduced. By using this method, the 2D spatial profile of potential fluctuation profile was successfully obtained.

Original languageEnglish
Article number11E731
JournalReview of Scientific Instruments
Volume87
Issue number11
DOIs
Publication statusPublished - Nov 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation

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