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Article overview
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Effect of laser polarization on QED cascading | V.F. Bashmakov
; E.N. Nerush
; I.Yu. Kostyukov
; A.M. Fedotov
; N.B. Narozhny
; | Date: |
15 Oct 2013 | Abstract: | Development of QED cascades in a standing electromagnetic wave for circular
and linear polarizations is simulated numerically with a 3D PIC-MC code. It is
demonstrated that for the same laser energy the number of particles produced in
a circularly polarized field is greater than in a linearly polarized field,
though the acquiring mean energy per particle is larger in the latter case. The
qualitative model of laser-assisted QED cascades is extended by including the
effect of polarization of the field. It turns out that cascade dynamics is
notably more complicated in the case of linearly polarized field, where
separation into the qualitatively different "electric" and "magnetic" regions
(where the electric field is stronger than the magnetic field and vice versa)
becomes essential. In the "electric" regions acceleration is suppressed and
moreover the high-energy electrons are even getting cooled by photon emission.
The volumes of the "electric" and "magnetic" regions evolve periodically in
time, and so does the cascade growth rate. In contrast to the linear
polarization the charged particles can be accelerated by circularly polarized
wave even in "magnetic" region. The "electric" and "magnetic" regions do not
evolve in time and cascade growth rate almost does not depend on time for
circular polarization. | Source: | arXiv, 1310.4077 | Services: | Forum | Review | PDF | Favorites |
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