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

Research output: Contribution to journalArticle

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 - Jan 1 2008

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electron energy
gases
electrons
transient response
pellets
cyclotrons
heat flux
injection
heat
gradients

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Core electron temperature rise due to Ar gas-puff in EC-heated LHD plasmas. / Tamura, N.; Inagaki, S.; Ida, K.; Tanaka, K.; Michael, C.; Tokuzawa, T.; Yamada, I.; Narihara, K.; Shimozuma, T.; Kubo, S.; Igami, H.; Fukuda, T.; Itoh, K.; Nagayama, Y.; Kawahata, K.; Sudo, S.; Komori, A.

In: Journal of Physics: Conference Series, Vol. 123, 012023, 01.01.2008.

Research output: Contribution to journalArticle

Tamura, N, Inagaki, S, Ida, K, Tanaka, K, Michael, C, Tokuzawa, T, Yamada, I, Narihara, K, Shimozuma, T, Kubo, S, Igami, H, Fukuda, T, Itoh, K, Nagayama, Y, Kawahata, K, Sudo, S & Komori, A 2008, 'Core electron temperature rise due to Ar gas-puff in EC-heated LHD plasmas', Journal of Physics: Conference Series, vol. 123, 012023. https://doi.org/10.1088/1742-6596/123/1/012023
Tamura, N. ; Inagaki, S. ; Ida, K. ; Tanaka, K. ; Michael, C. ; Tokuzawa, T. ; Yamada, I. ; Narihara, K. ; Shimozuma, T. ; Kubo, S. ; Igami, H. ; Fukuda, T. ; Itoh, K. ; Nagayama, Y. ; Kawahata, K. ; Sudo, S. ; Komori, A. / Core electron temperature rise due to Ar gas-puff in EC-heated LHD plasmas. In: Journal of Physics: Conference Series. 2008 ; Vol. 123.
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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.",
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T1 - Core electron temperature rise due to Ar gas-puff in EC-heated LHD plasmas

AU - Tamura, N.

AU - Inagaki, S.

AU - Ida, K.

AU - Tanaka, K.

AU - Michael, C.

AU - Tokuzawa, T.

AU - Yamada, I.

AU - Narihara, K.

AU - Shimozuma, T.

AU - Kubo, S.

AU - Igami, H.

AU - Fukuda, T.

AU - Itoh, K.

AU - Nagayama, Y.

AU - Kawahata, K.

AU - Sudo, S.

AU - Komori, A.

PY - 2008/1/1

Y1 - 2008/1/1

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AB - 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.

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