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Experimental investigations on the Stimulated Raman Scattering (SRS) in a magnetized environment

ORAL

Abstract

SRS plays a detrimental role in inertial confinement fusion (ICF) caused by a loss of energy and preheat of the fuel by suprathermal electrons generated through the decay of electron plasma waves (EPW). However, recent numerical work [1] has shown that SRS can be mitigated by a moderate external magnetic field. Such behavior of SRS in a pre-magnetized plasma has not been experimentally confirmed. With the development of applied magnetic fields for use in laser-plasma experiments, investigation on the effect of a magnetic field on SRS is now possible. We have introduced a new platform designed to investigate the mitigation of SRS at OMEGA-EP, which takes advantage of the MIFEDS pulse-power coil to pre-magnetize the plasma. The Sub-Aperture Backward Scatter (SABS) diagnostic was fielded to time resolve reflected light from Backward-SRS (BSRS). The first results of SABS show clear evidence of the reflected light resulting from the BSRS in the kinetic regime, kλD ~ 0.3 where k is the EPW wavenumber and λD is the Debye length.

In addition, the aspect of the generation of hot electrons by SRS and how it is affected by an external magnetic field will be addressed in a series of experiments at JLF, which will be also discussed. 

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Publication: [1] B. J. Winjum, et al. Phys. Rev. E 98, 043208 (2018)

Presenters

  • Simon Bolanos

    University of California, San Diego

Authors

  • Simon Bolanos

    University of California, San Diego

  • Mathieu Bailly-Grandvaux

    University of California San Diego, University of California, San Diego

  • Roman Lee

    University of California, Los Angeles

  • Mario J Manuel

    General Atomics - San Diego

  • Warren B Mori

    University of California, Los Angeles

  • SJ Spencer

    University of Warwick, University of Warwick, Coventry

  • Frank S Tsung

    University of California, Los Angeles

  • Benjamin J Winjum

    University of California, Los Angeles, University of California, Los Angeles <br />University of California, San Diego

  • Farhat N Beg

    University of California San Diego, University of California, San Diego, Center for Energy Research,University of California, San Diego, USA.