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Title: Spontaneous emission of electromagnetic radiation in turbulent plasmas

Known radiation emission mechanisms in plasmas include bremmstrahlung (or free-free emission), gyro- and synchrotron radiation, cyclotron maser, and plasma emission. For unmagnetized plasmas, only bremmstrahlung and plasma emissions are viable. Of these, bremmstrahlung becomes inoperative in the absence of collisions, and the plasma emission requires the presence of electron beam, followed by various scattering and conversion processes. The present Letter proposes a new type of radiation emission process for plasmas in a state of thermodynamic quasi-equilibrium between particles and enhanced Langmuir turbulence. The radiation emission mechanism proposed in the present Letter is not predicted by the linear theory of thermal plasmas, but it relies on nonlinear wave-particle resonance processes. The electromagnetic particle-in-cell numerical simulation supports the new mechanism.
Authors:
 [1] ;  [2] ; ;  [3] ;  [1] ;  [4]
  1. Instituto de Física, UFRGS, Porto Alegre, Rio Grande do Sul (Brazil)
  2. School of Space Research, Kyung Hee University, Yongin, Gyeonggi 446-701, South Korea and University of Maryland, College Park, Maryland 20742 (United States)
  3. Instituto de Física e Matemática, UFPel, Pelotas, Rio Grande do Sul (Brazil)
  4. (Brazil)
Publication Date:
OSTI Identifier:
22252177
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 1; 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; COLLISIONS; COMPUTERIZED SIMULATION; CYCLOTRONS; ELECTRON BEAMS; EMISSION; EQUILIBRIUM; MASERS; NONLINEAR PROBLEMS; PLASMA; SCATTERING; SYNCHROTRON RADIATION