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Title: On the theory of magnetic field generation by relativistically strong laser radiation

The authors consider the interaction of subpicosecond relativistically strong short laser pulses with an underdense cold unmagnetized electron plasma. It is shown that the strong plasma inhomogeneity caused by laser pulses results in the generation of a low frequency (quasistatic) magnetic field. Since the electron density distribution is determined completely by the pump wave intensity, the generated magnetic field is negligibly small for nonrelativistic laser pulses but increases rapidly in the ultrarelativistic case. Due to the possibility of electron cavitation (complete expulsion of electrons from the central region) for narrow and intense beams, the increase in the generated magnetic field slows down as the beam intensity is increased. The structure of the magnetic field closely resembles that of the field produced by a solenoid; the field is maximum and uniform in the cavitation region, then it falls, changes polarity and vanishes. In extremely dense plasmas, highly intense laser pulses in the self-channeling regime can generate magnetic fields {approximately} 100 Mg and greater.
Authors:
;  [1] ;  [2]
  1. International Centre for Theoretical Physics, Trieste (Italy)
  2. Texas Univ., Austin, TX (United States). Inst. for Fusion Studies|[International Centre for Theoretical Physics, Trieste (Italy)
Publication Date:
OSTI Identifier:
373897
Report Number(s):
DOE/ER/54346--752; IFSR--752
ON: DE96014770; TRN: 96:025585
DOE Contract Number:
FG03-96ER54346
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1996
Research Org:
Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
Sponsoring Org:
USDOE Office of Energy Research, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; 70 PLASMA PHYSICS AND FUSION; LASER RADIATION; INTERACTIONS; COLD PLASMA; BEAM-PLASMA SYSTEMS; MAGNETIC FIELDS; PLASMA DENSITY; RELATIVISTIC RANGE; FARADAY EFFECT; PLASMA FLUID EQUATIONS; WAVE PROPAGATION