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Stabilization of a low-frequency instability in a dipole plasma

Published online by Cambridge University Press:  01 December 2008

D. T. GARNIER,
A. C. BOXER,
J. L. ELLSWORTH,
A. K. HANSEN,
I. KARIM,
J. KESNER,
M. E. MAUEL,
E. E. ORTIZ and
A. ROACH
D. T. GARNIER
Affiliation:
Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
A. C. BOXER
Affiliation:
Plasma Science and Fusion Center, MIT, Cambridge, MA 02139, USA (kesner@psfc.mit.edu)
J. L. ELLSWORTH
Affiliation:
Plasma Science and Fusion Center, MIT, Cambridge, MA 02139, USA (kesner@psfc.mit.edu)
A. K. HANSEN
Affiliation:
Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
I. KARIM
Affiliation:
Plasma Science and Fusion Center, MIT, Cambridge, MA 02139, USA (kesner@psfc.mit.edu)
J. KESNER
Affiliation:
Plasma Science and Fusion Center, MIT, Cambridge, MA 02139, USA (kesner@psfc.mit.edu)
M. E. MAUEL
Affiliation:
Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
E. E. ORTIZ
Affiliation:
Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
A. ROACH
Affiliation:
Plasma Science and Fusion Center, MIT, Cambridge, MA 02139, USA (kesner@psfc.mit.edu)
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Abstract

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Low-frequency fluctuations are observed in a plasma confined by a strong dipole magnet and containing an energetic high-pressure population of trapped electrons. The quasi-coherent fluctuations have frequencies characteristic of drift frequencies of the lower temperature background plasma and have large toroidal and radial extent. They are excited throughout a wide range of plasma conditions determined by the level of neutral gas pressure. However, for a sufficiently high rate of neutral gas fueling, the plasma density profile flattens and the fluctuations disappear.

Information

Type
Papers
Information
Journal of Plasma Physics , Volume 74 , Issue 6 , December 2008, pp. 733 - 740
Copyright
Copyright © Cambridge University Press 2008

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