The Free Electron Maser in Pulsar Magnetospheres

Rüdiger Schopper, Christoph Nodes, Hartmut Ruhl, Thomas A. Kunzl and Harald Lesch
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Rüdiger Schopper: Max-Planck- Institiut für extraterrestrische Physik Giessenbachstraβe
Christoph Nodes: Centre for Interdisciplinary Plasma Science Scheinerstraβe 1, Universtäts-Sternewarte München
Hartmut Ruhl: General Atomics
Thomas A. Kunzl: Max Planck Institut für Quantenoptik
Harald Lesch: Centre for Interdisciplinary Plasma Science Scheinerstraβe 1, Universtäts-Sternewarte München

A chapter in High Performance Computing in Science and Engineering, Munich 2002, 2003, pp 411-422 from Springer

Abstract: Abstract We present the numerical simulations of coherent inverse Compton scattering (CICS) in a highly magnetized plasma process by means of a full three dimensional particle in cell code (PIC), which is mass and energy conservative. We used the parameters of a pusar magnetosphere where CICS is one of the most promising models for the generation of the observed highly coherent radio emission. First we show details of the onset and time evolution of strong Langmuir turbulence driven by a relativistic electron beam penetrating a strongly magnetized background plasma. The Langmuir turbulence acts as self-generated wiggler fields which bunch the beam electrons thereby inducing strong coherent emission of the bunches at frequency γ2 times the plasma frequency. The emitted power is about 10 GW in a few nanoseconds. This radiation is interpreted in terms of inverse Compton scattering on nonlinear density fluctuations. CICS is the longitudinal version of a laboratory free electron laser and is applicable in strongly magnetized plasmas like pulsars.

Keywords: beam plasma interaction; langmuir turbulence; coherent radio emission; particle in cell simulation; free electron maser (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1007/978-3-642-55526-8_33

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