Ripple enhanced banana drift loss at the outboard wall during ICRF/NBI heating in JT-60U

Y. Ikeda, K. Tobita, K. Hamamatsu, K. Ushigusa, O. Naito, H. Kimura

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Ripple enhanced banana drift loss of fast ions is studied on the basis of heat load measurements at the first wall near the outer equatorial plane in JT-60U. Hot spots in the ion cyclotron range of frequency (ICRF) and neutral beam injection (NBI) heating are observed at the outboard wall by using an infrared camera. In ICRF heating, the total heat load to the wail is around 5% of the injected ICRF power when the plasma-wall clearance gap is less than 0.1 m. The heat flux on the wall increases with the ICRF power and decreases strongly with the plasma density, which is consistent with Fokker-Planck calculations. In NBI heating, hot spots are observed at almost the same positions, and the heat flux and position agree with the banana drift loss as predicted by an orbit following Monte Carlo code.

Original languageEnglish
Pages (from-to)759-767
Number of pages9
JournalNuclear Fusion
Volume36
Issue number6
DOIs
Publication statusPublished - 1996 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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