Experimental exploration of profile control in the Princeton Beta Experiment-Modified (PBX-M) tokamak

S. Bernabei, R. Bell, M. Chance, T.K. Chu, M. Corneliussen, W. Davis, G. Gettlefinger, T. Gibney, N. Greenough, R. Hatcher, H. Hermann, D. Ignat, S. Jardin, R. Kaita, S. Kaye, C. Kessel, T. Kozub, H. Kugel, L. Lagin, B. LeBlancJ. Manickam, M. Okabayashi, H. Oliver, M. Ono, S. Paul, S. Preische, P. Roney, N. Sauthoff, S. Schweitzer, S. Sesnic, Y. Sun, H. Takahashi, W. Tighe, E. Valeo, S. Von Goeler, K. Voss, M. Mauel, G. Navratil, R. Cesario, S. Batha, F. Levinton, F. Rimini, N. Asakura, S. Jones, J. Kesner, S. Luckhardt, F. Paoletti, P. Woskow, A. Zolfaghari, T. Seki, J. Bell, J. Dunlap, A. England, D. Greenwood, J. Harris, G. Henkel, S. Hirschman, R. Isler, D. Lee, L. Blush, R. Conn, R. Doerner, Y. Hirooka, R. Lehmer, L. Schmitz, G. Tynan

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Abstract

The experimental program of the Princeton Beta Experiment-Modified (PBX-M) tokamak [Phys. Fluids B2, 1271 (1990)] is directed toward tailoring plasma profiles to achieve greater stability and confinement and to gain access to the second stability region. Modification of the current density profile has been achieved with lower-hybrid current drive (LHCD), leading to a regime free of global magnetohydrodynamic modes, while raising the value of q(0) above unity. The diffusion of the fast electrons produced by LHCD has been examined using two-dimensional hard x-ray imaging. Ion Bernstein waves (IBW) have been used for ion heating: a preliminary analysis shows that ion heating was spatially localized and in agreement with theoretical calculations. Divertor biasing has modified the electric field inside the last closed surface, resulting in the formation of a transport barrier, which in turn has reduced the threshold power of neutral beam injection (NBI) for H-mode transition by 25%. © 1993 American Institute of Physics.
Original languageEnglish
Pages (from-to)2562 - 2570
Number of pages9
JournalPhysics of Fluids B
Volume5
Issue number7
DOIs
Publication statusPublished - 1993
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Bernabei, S., Bell, R., Chance, M., Chu, T. K., Corneliussen, M., Davis, W., ... Tynan, G. (1993). Experimental exploration of profile control in the Princeton Beta Experiment-Modified (PBX-M) tokamak. Physics of Fluids B, 5(7), 2562 - 2570. https://doi.org/10.1063/1.860744