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Quasiperiodic behavior in beam-driven strong Langmuir turbulenceThe evolution of unmagnetized beam-driven strong Langmuir turbulence is studied in two dimensions by numerically integrating the Zakharov equations for systems pumped by monochromatic and broadband negative-damping drivers with nonzero central wavenumber. Long-time statistically steady states are reached for which the dependence of the evolution on the driver wavenumber, growth rate, and bandwidth is examined in detail. For monochromatic drivers, a quasiperiodic cycle is found to develop if the driver wavenumber is sufficiently large. The characteristic frequency of the quasiperiodic cycle and the average system energy are both approximately proportional to the growth rate. Broadening of the driver in wavenumber tends to degrade the system-wide coherence of the cycle, but its main features appear to survive on the scale of the coherence length of the driver.
Document ID
19900030413
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Robinson, P. A.
(Colorado Univ. Boulder, CO, United States)
Newman, D. L.
(Colorado, University Boulder, United States)
Date Acquired
August 14, 2013
Publication Date
December 1, 1989
Publication Information
Publication: Physics of Fluids B
Volume: 1
ISSN: 0899-8221
Subject Category
Plasma Physics
Accession Number
90A17468
Funding Number(s)
CONTRACT_GRANT: NSF ATM-85-11906
CONTRACT_GRANT: NAGW-91
CONTRACT_GRANT: NSF ATM-88-13255
CONTRACT_GRANT: NSG-7287
Distribution Limits
Public
Copyright
Other

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