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2016 ; 6
(ä): 24283
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Theory of Thomson scattering in inhomogeneous media
#MMPMID27068215
Kozlowski PM
; Crowley BJ
; Gericke DO
; Regan SP
; Gregori G
Sci Rep
2016[Apr]; 6
(ä): 24283
PMID27068215
show ga
Thomson scattering of laser light is one of the most fundamental diagnostics of
plasma density, temperature and magnetic fields. It relies on the assumption that
the properties in the probed volume are homogeneous and constant during the
probing time. On the other hand, laboratory plasmas are seldom uniform and
homogeneous on the temporal and spatial dimensions over which data is collected.
This is particularly true for laser-produced high-energy-density matter, which
often exhibits steep gradients in temperature, density and pressure, on a scale
determined by the laser focus. Here, we discuss the modification of the cross
section for Thomson scattering in fully-ionized media exhibiting steep spatial
inhomogeneities and/or fast temporal fluctuations. We show that the predicted
Thomson scattering spectra are greatly altered compared to the uniform case, and
may lead to violations of detailed balance. Therefore, careful interpretation of
the spectra is necessary for spatially or temporally inhomogeneous systems.