Kinetic Effects on the Stability Properties of Field-reversed Configurations [electronic resource] : I. Linear Stability
- Washington, D.C. : United States. Dept. of Energy. Office of Science, 2003.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 11.7 Megabytes pages : digital, PDF file
- Additional Creators:
- United States. Department of Energy. Office of Science and United States. Department of Energy. Office of Scientific and Technical Information
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- Free-to-read Unrestricted online access
- New computational results are presented which advance the understanding of the stability properties of the Field-Reversed Configuration (FRC). We present results of hybrid and two-fluid (Hall-MHD) simulations of prolate FRCs. The n = 1 tilt instability mechanism and growth rate reduction mechanisms are investigated in detail including resonant particle effects, finite Larmor radius and Hall stabilization, and profile effects. It is shown that the Hall effect determines the mode rotation and the change in the linear mode structure in the kinetic regime; however, the reduction in the growth rate is mostly due to finite Larmor radius effects. Resonant wave-particle interactions are studied as a function of (a) elongation, (b) the kinetic parameter S*, which is proportional to the ratio of the separatrix radius to the thermal ion Larmor radius, and (c) the separatrix shape. It is demonstrated that, contrary to the usually assumed stochasticity of the ion orbits in the FRC, a large fraction of the orbits are regular in long configurations when S* is small. A stochasticity condition is found, and a scaling with the S* parameter is presented. Resonant particle effects are shown to maintain the instability in the large gyroradius regime regardless of the separatrix shape.
- Report Numbers:
- E 1.99:pppl-3773
- Other Subject(s):
- Published through SciTech Connect.
Masaaki Yamada; Hantao Ji; Ronald C. Davidson; Elena V. Belova.
Princeton Plasma Physics Lab., NJ (US)
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