Evaluation of local magnetic field fluctuation in a toroidal plasma with heavy ion beam probe

A. Fujisawa, A. Shimizu, H. Nakano, S. Ohshima

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A method to measure magnetic field fluctuation using a heavy ion beam probe for a toroidal magnetically confined plasma is proposed by providing a mathematical formula to connect the probing beam movement with the change in the magnetic field. The first challenge of the method has been faced in an electron-cyclotron resonance heated plasma in the compact helical system (CHS). The results reveal the existence of three characteristic frequency regimes of the magnetic field fluctuations: a low frequency regime showing a long-distance correlation, an intermediate frequency regime obeying a power law and the turbulence regime. Discussion is held on the degree of the contaminations in the local magnetic field fluctuation that are caused by the magnetic field fluctuations integrated along the beam orbit and the local electric field fluctuations.

Original languageEnglish
Article number011
Pages (from-to)845-855
Number of pages11
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number6
DOIs
Publication statusPublished - Jun 1 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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