High heat flux damage of the guard limiter in Heliotron E

M. Fujitsuka, T. Shikama, N. Noda, H. Shinno, T. Tanabe, T. Mutoh, A. Iiyoshi

Research output: Contribution to journalArticlepeer-review


We examined the limiter-plates of the side protectors of the ICRF antennae in Heliotron E at Kyoto University, which were damaged by high-heat-flux loading. The limiter plates were exposed to about 5000 discharges during one year of operation. The metallurgical examinations revealed that the heat flux had been more than 100 kW/cm2 and about 2.5-8% of total plasma energy. The damaged area had been loaded with 100-160 kJ. It is estimated that 1021 manganese atoms were released into the plasma by this high-heat-flux damage of the limiter plates. The high-heat-flux damage generated cracks in the plates. Some of the cracks propagated into the unmelted parts. The damaged parts were found to contain a ferromagnetic phase.

Original languageEnglish
Pages (from-to)976-981
Number of pages6
JournalJournal of Nuclear Materials
Issue numberC
Publication statusPublished - 1989 Apr 1


  • Heliotron E
  • guard limiter
  • high-heat-flux
  • melt
  • re-solidify

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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