Picosecond Thermodynamics in Underdense Plasmas Measured with Thomson Scattering.
Phys Rev Lett
; 122(15): 155001, 2019 Apr 19.
Article
em En
| MEDLINE
| ID: mdl-31050505
ABSTRACT
The rapid evolutions of the electron density and temperature in a laser-produced plasma were measured using collective Thomson scattering. Unprecedented picosecond time resolution, enabled by a pulse-front-tilt compensated spectrometer, revealed a transition in the plasma-wave dynamics from an initially cold, collisional state to a quasistationary, collisionless state. The Thomson-scattering spectra were compared with theoretical calculations of the fluctuation spectrum using either a conventional Bhatnagar-Gross-Krook (BGK) collision operator or the rigorous Landau collision terms the BGK model overestimates the electron temperature by 50% in the most-collisional conditions.
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MEDLINE
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En
Ano de publicação:
2019
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Article