Enhanced inverse bremsstrahlung heating rates in a strong laser field

Details Enhanced inverse bremsstrahlung heating rates in a strong laser field Enhanced inverse bremsstrahlung heating rates in a strong laser field

2002-03-11

arxiv.org/abs/physics/0203030v2

Physics

Plasma Physics

12 pages, 12 figures

Scientific paper

10.1063/1.1586917

Test particle studies of electron scattering on ions, in an oscillatory electromagnetic field have shown that standard theoretical assumptions of small angle collisions and phase independent orbits are incorrect for electron trajectories with drift velocities smaller than quiver velocity amplitude. This leads to significant enhancement of the electron energy gain and the inverse bremsstrahlung heating rate in strong laser fields. Nonlinear processes such as Coulomb focusing and correlated collisions of electrons being brought back to the same ion by the oscillatory field are responsible for large angle, head-on scattering processes. The statistical importance of these trajectories has been examined for mono-energetic beam-like, Maxwellian and highly anisotropic electron distribution functions. A new scaling of the inverse bremsstrahlung heating rate with drift velocity and laser intensity is discussed.

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