Physics of the density limit in the W7-AS stellarator

L. Giannone, J. Baldzuhn, R. Burhenn, P. Grigull, U. Stroth, F. Wagner, R. Brakel, C. Fuchs, H. J. Hartfuss, K. McCormick, A. Weller, C. Wendland, K. Itoh, S. I. Itoh

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Density-limit discharges in the W7-AS stellarator, with constant line-integrated density and a duration of up to 2 s, were studied at three values of the toroidal magnetic field (B = 0.8, 1.25 and 2.5 T). The central factor governing the physics of the density limit in stellarators was shown to be the decreasing net power to the plasma when the centrally-peaked radiated power density profile exceeds that of the deposited power density. The process was further accelerated by the peaking of electron density under these conditions. In discharges with B = 2.5 T, simulations of the centrally-peaked radiation power density profiles could be shown to be due to peaked impurity density profiles.

元の言語英語
ページ(範囲)603-627
ページ数25
ジャーナルPlasma Physics and Controlled Fusion
42
発行部数6
DOI
出版物ステータス出版済み - 6 2000

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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    Giannone, L., Baldzuhn, J., Burhenn, R., Grigull, P., Stroth, U., Wagner, F., Brakel, R., Fuchs, C., Hartfuss, H. J., McCormick, K., Weller, A., Wendland, C., Itoh, K., & Itoh, S. I. (2000). Physics of the density limit in the W7-AS stellarator. Plasma Physics and Controlled Fusion, 42(6), 603-627. https://doi.org/10.1088/0741-3335/42/6/301