Core electron temperature rise due to Ar gas-puff in EC-heated LHD plasmas

N. Tamura, S. Inagaki, K. Ida, K. Tanaka, C. Michael, T. Tokuzawa, I. Yamada, K. Narihara, T. Shimozuma, S. Kubo, H. Igami, T. Fukuda, K. Itoh, Y. Nagayama, K. Kawahata, S. Sudo, A. Komori

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2 Citations (Scopus)

Abstract

A rise of the core electron temperature Te in response to a controlled Ar gas-puff is observed in electron cyclotron heated plasmas of the Large Helical Device. The increase in core Te is about 1 keV after the Ar gas-puff. Since density peaking does not take place after the Ar gas-puff, this phenomenon is different from radiatively improved mode. Transient response analysis shows that a close similarity in the relationship between the electron heat flux and the Te gradient appears between the core Te rise after the Ar gas-puff and that due to the nonlocal effect induced by a pellet injection. Thus non-locality in the electron heat transport is essential for the core Te rise after the Ar gas-puff.

Original languageEnglish
Article number012023
JournalJournal of Physics: Conference Series
Volume123
DOIs
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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