Inverse bremsstrahlung absorption in laser-fusion plasma

Inverse bremsstrahlung absorption (IBA) is the most efficient absorption mechanism in laser-fusion plasma. IBA is the process in which an electron absorbs a photon while colliding with an ion or with another electron. IBA of laser energy in homogeneous and unmagnetized plasma has been studied using...

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Bibliographic Details
Published inJournal of theoretical and applied physics Vol. 14; no. 3; pp. 261 - 264
Main Authors Firouzi Farrashbandi, N., Eslami-Kalantari, M.
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2020
Springer Nature B.V
Subjects
Absorption
Applied and Technical Physics
Atomic
Bremsstrahlung
Condensed Matter Physics
Distribution functions
Fokker-Planck equation
Kinetic theory
Lasers
Mathematical analysis
Medical and Radiation Physics
Molecular
Nanoscale Science and Technology
Optical and Plasma Physics
Parameters
Physical properties
Physics
Physics and Astronomy
Pulsed lasers
Spherical coordinates
nonextensive
Invers bremsstrahlung
Absorption
Fusion
Inertial Confinement
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Summary:Inverse bremsstrahlung absorption (IBA) is the most efficient absorption mechanism in laser-fusion plasma. IBA is the process in which an electron absorbs a photon while colliding with an ion or with another electron. IBA of laser energy in homogeneous and unmagnetized plasma has been studied using the Fokker–Planck equation. The isotropic function is considered as a q -nonextensive electrons distribution function. By considering a circular-polarized laser, kinetic theory and spherical coordinates, the first anisotropic function is calculated. A pulsed laser is considered, and the effect of the physical parameters such as temperature and q ( q is a parameter quantifying the degree of nonextensivity) has been studied on the absorption value. Later, the results of continuous laser and pulsed laser have been compared. The calculations of IBA performed for a variety of q . According to our calculations, the IBA value in neighboring of the critical density layer for continuous laser is higher than pulsed laser. The final results show the IBA value increases with increase in q parameter and oppositely it decreases with temperature increasing.
ISSN:2251-7227
2251-7235
DOI:10.1007/s40094-020-00375-4