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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

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.

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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