Observation of heat flux and plasma flow in scrape off layer in QUEST

T. Onchi, Y. Mahira, K. Nagaoka, S. Tashima, S. Banerjee, K. Mishra, H. Idei, K. Hanada, K. Nakamura, A. Fujisawa, Y. Nagashima, M. Hasegawa, K. Matsuoka, A. Kuzmin, O. Watanabe, S. Kawasaki, H. Nakashima, A. Higashijima

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Abstract

Abstract Thermal probe with double function of thermocouples and Langmuir probe has been developed, and the initial data observed in far-SOL in QUEST is obtained. Heat flux of megawatt per square meters related to energetic electrons and sonic plasma flow in far-SOL have been observed in the current rump-up phase although no high power inductive force like ohmic winding is applied. The heat flux and the flow are suppressed after the current is built up. In the quasi-steady state, plasma current starts and keeps sawtooth-like oscillation with 20 Hz frequency. The heat flux and the flow in far-SOL have clear responses to the oscillation.

Original languageEnglish
Article number48807
Pages (from-to)428-431
Number of pages4
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - Jul 22 2015

All Science Journal Classification (ASJC) codes

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

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    Onchi, T., Mahira, Y., Nagaoka, K., Tashima, S., Banerjee, S., Mishra, K., Idei, H., Hanada, K., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Kuzmin, A., Watanabe, O., Kawasaki, S., Nakashima, H., & Higashijima, A. (2015). Observation of heat flux and plasma flow in scrape off layer in QUEST. Journal of Nuclear Materials, 463, 428-431. [48807]. https://doi.org/10.1016/j.jnucmat.2014.11.136