Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device

H. Yamada, K. Y. Watanabe, S. Sakakibara, S. Murakami, M. Osakabe, O. Kaneko, K. Narihara, K. Tanaka, K. Ida, T. Minami, M. Goto, H. Idei, S. Inagaki, S. Kado, K. Kawahata, A. Komori, S. Kubo, J. Miyazawa, T. Morisaki, S. MoritaH. Nakanishi, S. Ohdachi, N. Ohyabu, Y. Oka, B. J. Peterson, R. Sakamoto, M. Shoji, H. Suzuki, Y. Takeiri, K. Toi, T. Tokuzawa, T. Tsumori, I. Yamada, K. Ohkubo, S. Sudo, K. Yamazaki, O. Motojima, M. Fujiwara

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59 Citations (Scopus)

Abstract

The confinement characteristics of large net-current-free plasmas heated by neutral-beam injection have been investigated in the Large Helical Device (LHD). A systematic enhancement in energy-confinement times from the scaling derived from the medium-sized heliotron/torsatron experiments have been observed, which is attributed to the edge pedestal. The core confinement is scaled with the Bohm term divided by the square root of the gyro radii. The comparative analysis using a dimensionally similar discharge in the Compact Helical System indicates gyro-Bohm dependence in the core and transport improvement in the edge region of LHD plasmas.

Original languageEnglish
Pages (from-to)1216-1219
Number of pages4
JournalPhysical review letters
Volume84
Issue number6
DOIs
Publication statusPublished - 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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