Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-30
Astronomy and Astrophysics
Astrophysics
7 pages, 9 figures. To appear in the Proceedings of the 270. WE-Heraeus Seminar on Neutron Stars, Pulsars and Supernova Remnan
Scientific paper
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 pulsar 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 gamma^2 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.
Kunzl Thomas A.
Lesch Harald
Ruhl Hartmut
Schopper Rüdiger
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