A parasitic effect in neutral particle diagnostic using a helium probing beam

Kenji Tobita, Yoshinori Kusama, Takao Itoh, Masahiro Nemoto, Hiroshi Takeuchi, Yoshimitsu Tsukahara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper describes the characteristic and the physical picture of a parasitic disturbance, which can occur because of the drift motion of probing beam ions trapped at the plasma edge, in active neutral particle measurements for magnetically confined fusion devices. In the JT-60 experiments, the disturbance is observed under the condition in which a neutral particle analyzer views the high recycling region, i.e., the divertor, and the occurrence of the parasitic effect is substantially dependent on the safety factor at the plasma boundary. Also discussed are the validity of our interpretation and some measures for avoiding the disturbance.

Original languageEnglish
Pages (from-to)760-764
Number of pages5
JournalJapanese journal of applied physics
Issue number4 R
Publication statusPublished - 1990 Apr
Externally publishedYes


  • Active beam scattering
  • Banana orbit
  • Beam probe
  • JT-60
  • Neutral particle diagnostic
  • Tokamak
  • Trapped particle

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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