Studies of Global Stability of Fluid-reversed Configuration Plasmas using a Rigid Body Model

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Global stability of field-reversed configuration (FRC) plasmas has been studied using a simple rigid body model in the parameter space ofs (ratio of separatrix radius to average ion gyroradius) and plasma elongation E (ratio of separatrix length to separatrix diameter). Tilt stability is predicted, independent of s, for FRC`s with low E(oblate), while the tilt stability of FRC`s with large E (prolate)depends on s/E. It is found that plasma rotation due to ion diamagnetic drift can stabilize the tilt mode when s/E is less than or equal to1.7. The so-called collisionless ion gyroviscosity also is identified to stabilize tilt when ... continued below

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32 pages; Other: FDE: PDF

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Ji, H. April 1998.

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  • Ji, H. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ 08543 (US)

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Description

Global stability of field-reversed configuration (FRC) plasmas has been studied using a simple rigid body model in the parameter space ofs (ratio of separatrix radius to average ion gyroradius) and plasma elongation E (ratio of separatrix length to separatrix diameter). Tilt stability is predicted, independent of s, for FRC`s with low E(oblate), while the tilt stability of FRC`s with large E (prolate)depends on s/E. It is found that plasma rotation due to ion diamagnetic drift can stabilize the tilt mode when s/E is less than or equal to1.7. The so-called collisionless ion gyroviscosity also is identified to stabilize tilt when s/E is less than or equal to 2.2. Combining these two effects, the stability regime broadens to s/E is less than or equal to 2.8, consistent with previously developed theories. A small additional rotation (e.g., a Mach number of 0.2) can improve tilt stability significantly at large E. A similar approach is taken to study the physics of the shift stability. It is found that radial shift is unstable when E is < 1 WHILE AXIAL SHIFT IS UNSTABLE WHEN E is> 1. However, unlike tilt stability, gyroviscosity has little effect onshift stability.

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32 pages; Other: FDE: PDF

Notes

OSTI as DE00016753

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  • Other Information: Supercedes report DE98058043; PBD: April 1998

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  • Other: DE98058043
  • Report No.: PPPL--3296
  • Grant Number: AC02-CHO-3073
  • DOI: 10.2172/16753 | External Link
  • Office of Scientific & Technical Information Report Number: 16753
  • Archival Resource Key: ark:/67531/metadc624729

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • April 1998

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  • June 16, 2015, 7:43 a.m.

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  • April 15, 2016, 8:05 p.m.

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Ji, H. Studies of Global Stability of Fluid-reversed Configuration Plasmas using a Rigid Body Model, report, April 1998; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc624729/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.