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Experiments on current-driven three-dimensional ion sound turbulence. I - Return-current limited electron beam injection. II - Wave dynamicsPulsed electron beam injection into a weakly collisional magnetized background plasma is investigated experimentally; properties of the electron beam and background plasma, as well as the low-frequency instabilities and wave dynamics, are discussed. The current of the injected beam closes via a field-aligned return current of background electrons. Through study of the frequency and wavenumber distribution, together with the electron distribution function, the low-frequency instabilities associated with the pulsed injection are identified as ion acoustic waves driven unstable by the return current. The frequency cut-off of the instabilities predicted from renormalized plasma turbulence theory, has been verified experimentally.
Document ID
19780038851
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stenzel, R. L.
(TRW Systems Redondo Beach, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1978
Publication Information
Publication: Physics of Fluids
Volume: 21
Subject Category
Plasma Physics
Accession Number
78A22760
Funding Number(s)
CONTRACT_GRANT: NASW-2953
Distribution Limits
Public
Copyright
Other

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