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Abstract
Time-resolved spectra are often recorded in optical Thomson scattering experiments of laser-produced plasmas. In this article, the meaning of time-resolved spectrum output from a grating spectrometer is examined. Our results show that the recorded signal is indeed a convolution of the response function of the dispersion element and the product of the instant local dynamic form factor and electron density when the plasma evolves slowly; the plasma varies very little in the time duration of the scattering light passing through the scattering volume.
Highlights
With novel schemes of experimental setup and data analysis,7,11,12 plasma parameters can be inferred with high accuracy, making Thomson scattering a key tool for quantitative study of high-energydensity physics
In a modern experiment of optical Thomson scattering off laser-produced plasmas, scattered light waves are collected with an imaging system and are relayed into a grating spectrometer coupled with a streak camera
We examine the meaning of the so-called timeresolved Thomson scattering spectrum that is usually encountered in experiments of laser-driven high-energy-density physics
Summary
Thomson scattering is a powerful diagnostic for plasma physics because it can provide accurate and reliable information of high temperature plasmas. In the fields of high-energy-density physics in relevance to laser fusion and laboratory astrophysics, Thomson scattering systems have been developed for various laser facilities. With novel schemes of experimental setup and data analysis, plasma parameters can be inferred with high accuracy, making Thomson scattering a key tool for quantitative study of high-energydensity physics. In a modern experiment of optical Thomson scattering off laser-produced plasmas, scattered light waves are collected with an imaging system and are relayed into a grating spectrometer coupled with a streak camera. With such a kind of experimental setup, time-resolved Thomson scattering spectra are obtained, from which physical processes of interest are inferred with the assumption that the recorded spectrum is proportional to the dynamic form factor. Since Thomson scattering has been a very accurate experiment tool for plasma physics, the meaning of the recorded signal should be carefully checked.
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