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Nonlinear wave scattering and electron beam relaxationThe role played by nonlinear scattering during the relaxation of a warm electron beam is investigated through a numerical code based on kinetic equations. The code encompasses the quasi-linear wave-electron interaction and wave-wave scattering off ion clouds. Ions with velocities 2 nu sub i (nu sub i being the ion thermal velocity) are found to be the most efficient for scattering the Langmuir waves off their polarization clouds. The transfer rate of the spectrum out of resonance with the beam is larger by a factor 3 compared to usual estimates. The changes produced in the dispersion relation by the presence of the beam electrons dramatically alter the characteristics of the secondary spectrum. In a late phase the classic condensate K of about 0 is depleted, with the formation of a new condensate in resonance with the flat-topped beam distribution, which follows from the fact that the mere presence of the beam electrons creates a minimum in the frequency-wave-number relation. For strong and slow beams, the predictions of the code are found to be in excellent agreement with the results of the particle simulation if a dispersion relation that includes the beam is used.
Document ID
19910061954
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Muschietti, L.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Dum, C. T.
(Max-Planck-Institut fuer Physik und Astrophysik Garching, Federal Republic of Germany, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Physics of Fluids B
Volume: 3
Issue: 8 pt
ISSN: 0899-8221
Subject Category
Plasma Physics
Accession Number
91A46577
Funding Number(s)
CONTRACT_GRANT: AF-AFOSR-90-0095
CONTRACT_GRANT: NAGW-1532
Distribution Limits
Public
Copyright
Other

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