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10-15 May 2021
Virtual Event
Europe/Vienna timezone
The Conference will be held virtually from 10-15 May 2021

Electron ion inverse bremsstrahlung absorption in laser fusion magnetized plasma

12 May 2021, 14:00
4h 45m
Virtual Event

Virtual Event

Regular Poster Inertial Fusion Energy P4 Posters 4

Speaker

Prof. Abdelaziz Sid (LRPRIM laboratory, department of physics, faculty of matter sciences, university of Batna 1)

Description

Laser Magneto-Inertial fusion is a recently developed approach for the thermonuclear fusion. It consists in applying to the laser inertial fusion plasma a strong magnetic field whose the role is to limit the diffusion of the formed plasma during the impact of an intense laser pulse with a target containing the thermonuclear fuel, as well as the confinement of produced alpha particles by the fusion reaction. This permits to reduce the energy losses and even improves the compression conditions.
In this paper, the electron-ion (e-i) inverse bremsstrahlung absorption (IBA) of the laser energy in magnetized plasma in the frame of the MIF is analytically studied. We have considered a cylindrical scheme where the laser wave, circularly polarized, propagates in the direction of magnetic field (parallel mode).
The interaction of the laser pulse with the magnetized plasma is described by the Fokker-Planck (FP) equation with a Landau collision term. In order to resolve the FP equation, we have considered two scales of time evolutions for the distribution function: a fast scale time evolution following the laser wave time variation and a slow hydrodynamic scale time. The electron velocities distribution, developed on the spherical harmonics is analytically calculated.
The e-i IBA, <E.j>, is analytically calculated using the found expression of the distribution function. It is explicitly expressed as function the parameters of plasma, laser pulse and the applied magnetic field.
The numerical analysis of model equation shows the variation of the IB absorption with the different physical parameters. We point out in this context that the absorption is affected by the magnetic field and this depends to the polarization of the laser wave, increasing for the left polarization and decreasing for the right polarization.
Practical scaling laws are established for the MIF scheme and for the Magnetic confinement plasma heated by the radio-frequency wave.
The obtained results in this study permit to optimize the laser and plasma parameters in order to obtain good efficiency of the IB absorption in MIF experiments.

Keywords: Laser, Plasma, Magneto-inertial fusion; Inverse bremsstrahlung absorption; Fokker-Planck equation, scaling laws, time scales
References
[1] Thio Y C Francis 2008 Journal of Physics: Conference Series 112 042084
[2] Wurden G A et al. 2016 Journal of Fusion Energy 35 69
[3] Stephen A., Slutz and Roger A. Vesey 2012 Physical Review Letters 108 025003
[4] Pfalzner S 1998 Phyical Revew E 57 (4) 4698
[5] Silin V P and Silin P V 2002 Plasma Physics Reports 28 (11) 936
[6] Langdon A Bruce 1980 Physical Review Letters 44 575
[7] Bendib K, Bendib A and Sid A 1998 Laser Part. Beams 16 423
[8] Bendib A, Bendib K and Sid A 1997 Physical Review E 55 7522
[9] Sid A 2003 Physic of Plasmas 10 214
[10] Abramowitz M and Stegun I A 1965 Handbook of Mathematical Functions (Dover, New York)
[11] Szego G 1975 Orthogonal Polynomials (AMS, Providence, RI, 4th edition)

Affiliation LRPRIM laboratory, faculty of matter sciences, department of physics, university of Batna 1
Country or International Organization Algeria

Primary author

Prof. Abdelaziz Sid (LRPRIM laboratory, department of physics, faculty of matter sciences, university of Batna 1)

Co-authors

Dr Abdenasser Ghezal (Commissariat for atomic energy (COMENA)) Mr Oussama Boultif (LRPRIM laboratory, department of physics, faculty of matter sciences, university of Batna 1)

Presentation Materials

Peer reviewing

Paper