Edge plasma control by rf electric field in the compact helical system (CHS)

T. Shoji, A. Sagara, N. Noda, M. Hosokawa, K. Ida, H. Idei, H. Iguchi, O. Kaneko, S. Kubo, K. Matsuoka, S. Morita, K. Nishimura, S. Okamura, C. Takahashi, Y. Takeiri, H. Yamada

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Abstract

The reduction of the plasma heat flux on the material limiter and the stabilization of the fluctuations at the plasma boundary by the use of an rf ponderomotive potential barrier on the limiter (rf limiter) have been demonstrated in the compact helical system (CHS) for the ECH heated plasma. The rf current on a graphite limiter surface along magnetic field lines produces a ponderomotive potential barrier, which is large at the limiter edges. The high heat load on the limiter edges, which is measured using an infrared TV camera, has been shown to be reduced by an rf power of 1.4 kW at a frequency of 10 MHz (ωci<ωωce). Another remarkable effect of the ponderomotive potential barrier on the limiter that has been observed is the suppression of density fluctuations (<100 kHz) at the plasma boundary.

Original languageEnglish
Pages (from-to)824-828
Number of pages5
JournalJournal of Nuclear Materials
Volume196-198
Issue numberC
DOIs
Publication statusPublished - Dec 1 1992
Externally publishedYes

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All Science Journal Classification (ASJC) codes

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

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