Temperature-controlled graphite limiter experiments in CHS plasma

A. Sagara, T. Shoji, N. Noda, M. Fujiwara, M. Hosokawa, K. Ida, Hiroshi Idei, H. Iguchi, O. Kaneko, A. Karita, S. Kubo, K. Matsuoka, O. Motojima, S. Morita, K. Nishimura, S. Okamura, K. Okazaki, T. Ozaki, K. Sato, H. SanukiC. Takahasi, Y. Takeiri, Y. Takita, K. Tsuzuki, H. Yamada

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)


A movable graphite limiter with an internal heater has been installed in the heliotron/torsatron type compact helical system (CHS). Comparing discharges with and without the limiter the origin of major impurities and the role of the limiter are discussed. Infrared TV measurements reveal that there are two hot spots on the limiter due to heat loading and their temperatures depend on the electron density and/or the magnetic field direction. Limiter temperature dependence of measured CH/Hγ, CI, CII, OII, CH+3, OV and total radiation loss is compared. From these experiments it is concluded that CH4 molecules produced chemically on the limiter are presumed to recycle rapidly near the limiter and both carbon and oxygen impurities result probably from CO produced chemically on the limiter with oxygen which is predominant in CHS and originates mostly from the first wall. At surface temperatures above 900 ° C the limiter effect on impurities is observable in the main plasma.

ジャーナルJournal of Nuclear Materials
出版ステータス出版済み - 12 3 1990

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 材料科学(全般)
  • 原子力エネルギーおよび原子力工学


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