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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Abstract

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.

Original languageEnglish
Pages (from-to)603-627
Number of pages25
JournalPlasma Physics and Controlled Fusion
Volume42
Issue number6
DOIs
Publication statusPublished - Jun 1 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