Sawteeth and energy confinement in the Madison Symmetric Torus reversed-field pinch

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871775· OSTI ID:278970

Chapman, B E; Almagri, A F; Cekic, M; Den Hartog, D J; Prager, S C; Sarff, J S ^[1]

---

1. 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, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FLUCTUATIONS
PLASMA CONFINEMENT
PLASMA MACROINSTABILITIES
REVERSE-FIELD PINCH
SAWTOOTH OSCILLATIONS