Sawteeth and energy confinement in the Madison Symmetric Torus reversed-field pinch
- University of Wisconsin, Department of Physics, 1150 University Avenue, Madison, Wisconsin 53706 (United States)
Most Madison Symmetric Torus (MST) [Fusion Technol. {bold 19}, 131 (1991)] reversed-field pinch discharges exhibit sawtooth oscillations with a period of 2{endash}5 ms, corresponding to magnetohydrodynamic (MHD) instability and increased transport. However, in discharges where the plasma-facing wall has been boronized, the plasma resistivity is reduced, and sawteeth are often suppressed for periods up to 20 ms. The energy confinement time during these sawtooth-free periods is triple the normal value, corresponding to a higher plasma temperature and lower Ohmic input power. In addition, the steady growth of the dominant magnetic fluctuations normally observed between sawtooth crashes is absent. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 278970
- Journal Information:
- Physics of Plasmas, Vol. 3, Issue 3; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
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