Numerical study of tilt stability of prolate field-reversed configurations Page: 3 of 34
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NUMERICAL STUDY OF TILT STABILITY OF
PROLATE FIELD-REVERSED CONFIGURATIONS
E. V. Belova, S. C. Jardin, H. Ji, M. Yamada, R. Kulsrud
Princeton Plasma Physics Laboratory, Princeton, NJ 08543, USA
Global stability of the Field-Reversed Configuration (FRC) has been investigated nu-
merically using both 3D MHD and hybrid (fluid electron and 6f particle ion) simulations.
The stabilizing effects of velocity shear and large ion orbits on the n = 1 internal tilt mode
in the prolate FRCs have been studied. Sheared rotation is found to reduce the growth
rate, however a large rotation rate with Mach number of M > 1 is required in order for
significant reduction in the instability growth rate to occur. Kinetic effects associated with
large thermal ion orbits have been studied for different kinetic equilibria. Our simulations
show that there is a reduction in the tilt mode growth rate due to finite ion Larmor radius
(FLR) effects, but complete linear stability has not been found, even when the thermal ion
gyroradius is comparable to the distance between the field null and the separatrix. The in-
stability existing beyond the FLR theory threshold could be due to the resonant interaction
of the wave with ions whose Doppler shifted frequency matches the betatron frequency.
PACS numbers: 52.35.Py, 52.55.Hc, 52.65.Rr, 52.65.Kj
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Belova, E. V.; Jardin, S. C.; H. Ji, M. Yamada & Kulsrud, R. Numerical study of tilt stability of prolate field-reversed configurations, report, June 21, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc712508/m1/3/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.