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Low-frequency electrostatic waves in a magnetized, current-free, heavy negative ion plasma

Published online by Cambridge University Press:  14 November 2013

S. H. KIM,
R. L. MERLINO,
J. K. MEYER and
M. ROSENBERG
S. H. KIM
Affiliation:
Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA (robert-merlino@uiowa.edu)
R. L. MERLINO
Affiliation:
Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA (robert-merlino@uiowa.edu)
J. K. MEYER
Affiliation:
Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA (robert-merlino@uiowa.edu)
M. ROSENBERG
Affiliation:
Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093, USA
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Abstract

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We report experimental observations of a low-frequency (≪ ion gyrofrequency) electrostatic wave mode in a magnetized cylindrical (Q machine) plasma containing positive ions, very few electrons and a relatively large fraction (n−/ne > 103) of heavy negative ions (m−/m+ ≈ 10), and no magnetic field-aligned current. The waves propagate nearly perpendicular to B with a multiharmonic spectrum. The maximum wave amplitude coincided spatially with the region of largest density gradient suggesting that the waves were excited by a drift instability in a nearly electron-free positive ion–negative ion plasma

References

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