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Article overview
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Energy gain by laser-accelerated electrons in a strong magnetic field | | A. Arefiev
; Z. Gong
; A. P. L. Robinson
; | | Date: |
5 Oct 2019 | | Abstract: | The manuscript deals with electron acceleration by a laser pulse in a plasma
with a static uniform magnetic field $B_*$. The laser pulse propagates
perpendicular to the magnetic field lines with the polarization chosen such
that $({f{E}}_{laser} cdot {f{B}}_*) = 0$. The focus of the work is on the
electrons with an appreciable initial transverse momentum that are unable to
gain significant energy from the laser in the absence of the magnetic field due
to strong dephasing. It is shown that the magnetic field can initiate an energy
increase by rotating such an electron, so that its momentum becomes directed
forward. The energy gain continues well beyond this turning point where the
dephasing drops to a very small value. In contrast to the case of purely vacuum
acceleration, the electron experiences a rapid energy increases with the
analytically derived maximum energy gain dependent on the strength of the
magnetic field and the phase velocity of the wave. The energy enhancement by
the magnetic field can be useful at high laser amplitudes, $a_0 gg 1$, where
the acceleration similar to that in the vacuum is unable to produce energetic
electrons over just tens of microns. A strong magnetic field helps leverage an
increase in $a_0$ without a significant increase in the interaction length. | | Source: | arXiv, 1910.2196 | | Services: | Forum | Review | PDF | Favorites | |
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