Fluctuations and transport in the reversed field pinch: Characterization and reduction

Conference · Thu Sep 01 04:00:00 EDT 1994

OSTI ID:10185264

Sarff, J. S. ^[1]; Almagri, A. F. ^[1]; Callen, J. D. ^[1]; Cekic, M. ^[1]; Chapman, B. E. ^[1]; Crocker, N. ^[1]; Den Hartog, D. J. ^[1]; Fernandez, E. ^[1]; Fiksel, G. ^[1]; Harvey, R. W. ^[2]

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1. Univ. of Wisconsin, Madison, WI (United States)
2. General Atomics, San Diego, CA (United States). and others

Reduction via current profile control of the low frequency, resonant, tearing mode fluctuations responsible for the stochastic magnetic field in the core of the RFP has been demonstrated in MST using auxiliary inductive current drive. In making this reduction, sawteeth are stabilized, and the energy confinement time doubles. To enhance and maintain current profile control and improved confinement, non-inductive current drive is required. Analytical and numerical studies indicate that electrostatic and RF current drive can stabilize the tearing fluctuations. Experiments to test such methods are in preparation on MST. In a second key area relating to RFP confinement, recent theoretical initiatives have found that, in the presence of tearing fluctuations, the growth rates and mode widths of short wavelength turbulence increases. If such turbulence governs transport at the edge of the RFP, then reduction of tearing modes may improve edge confinement as well.

• Research Organization: Wisconsin Univ., Madison, WI (United States). Plasma Physics Research
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-85ER53198
• OSTI ID: 10185264
• Report Number(s): DOE/ER/53198--249; IAEA-CN--60/C-1-I-5; CONF-940933--4; ON: DE95000590; BR: AT051011A/AT0530020
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330
700340
700350
CHARGED-PARTICLE TRANSPORT
CONFINEMENT TIME
CURRENT-DRIVE HEATING
INSTABILITY GROWTH RATES
PARTICLE LOSSES
PLASMA KINETICS, TRANSPORT, AND IMPURITIES
PLASMA PRODUCTION, HEATING, CURRENT DRIVE, AND INTERACTIONS
PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES
REVERSED-FIELD PINCH DEVICES
SAWTOOTH OSCILLATIONS
STABILIZATION
TEARING INSTABILITY