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

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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 ... continued below

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23 p.

Creation Information

Berezhiani, V.I.; Shatashvili, N.L. & Mahajan, S.M. July 1, 1996.

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Description

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.

Physical Description

23 p.

Notes

INIS; OSTI as DE96014770

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  • Other Information: PBD: Jul 1996

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  • Other: DE96014770
  • Report No.: DOE/ER/54346--752
  • Report No.: IFSR--752
  • Grant Number: FG03-96ER54346
  • DOI: 10.2172/373897 | External Link
  • Office of Scientific & Technical Information Report Number: 373897
  • Archival Resource Key: ark:/67531/metadc680819

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  • July 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 10, 2016, 2:14 p.m.

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Berezhiani, V.I.; Shatashvili, N.L. & Mahajan, S.M. On the theory of magnetic field generation by relativistically strong laser radiation, report, July 1, 1996; Austin, Texas. (digital.library.unt.edu/ark:/67531/metadc680819/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.