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Title: Backward Raman amplification in the Langmuir wavebreaking regime

In plasma-based backward Raman amplifiers, the output pulse intensity increases with the input pump pulse intensity, as long as the Langmuir wave mediating energy transfer from the pump to the seed pulse remains intact. However, at high pump intensity, the Langmuir wave breaks, at which point the amplification efficiency may no longer increase with the pump intensity. Numerical simulations presented here, employing a one-dimensional Vlasov-Maxwell code, show that, although the amplification efficiency remains high when the pump only mildly exceeds the wavebreaking threshold, the efficiency drops precipitously at larger pump intensities.
Authors:
 [1] ; ;  [2]
  1. Department of Electrical Engineering, Technion Israel Institute of Technology, Haifa 32000 (Israel)
  2. Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540 (United States)
Publication Date:
OSTI Identifier:
22403291
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFICATION; AMPLIFIERS; COMPUTERIZED SIMULATION; EFFICIENCY; ENERGY TRANSFER; ONE-DIMENSIONAL CALCULATIONS; PLASMA; PULSES; PUMPS