Thumbnail
Access Restriction
Open

Author Pecover, J. D. ♦ Chittenden, J. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ AMPLITUDES ♦ CURRENTS ♦ INERTIAL CONFINEMENT ♦ INERTIAL FUSION DRIVERS ♦ JOULE HEATING ♦ MAGNETOHYDRODYNAMICS ♦ RAYLEIGH-TAYLOR INSTABILITY ♦ ROUGHNESS ♦ SOLIDS ♦ SURFACES ♦ TEMPERATURE DEPENDENCE ♦ THREE-DIMENSIONAL CALCULATIONS ♦ WAVELENGTHS
Abstract A critical limitation of magnetically imploded systems such as magnetized liner inertial fusion (MagLIF) [Slutz et al., Phys. Plasmas 17, 056303 (2010)] is the magneto-Rayleigh-Taylor (MRT) instability which primarily disrupts the outer surface of the liner. MagLIF-relevant experiments have showed large amplitude multi-mode MRT instability growth growing from surface roughness [McBride et al., Phys. Rev. Lett. 109, 135004 (2012)], which is only reproduced by 3D simulations using our MHD code Gorgon when an artificially azimuthally correlated initialisation is added. We have shown that the missing azimuthal correlation could be provided by a combination of the electro-thermal instability (ETI) and an “electro-choric” instability (ECI); describing, respectively, the tendency of current to correlate azimuthally early in time due to temperature dependent Ohmic heating; and an amplification of the ETI driven by density dependent resistivity around vapourisation. We developed and implemented a material strength model in Gorgon to improve simulation of the solid phase of liner implosions which, when applied to simulations exhibiting the ETI and ECI, gave a significant increase in wavelength and amplitude. Full circumference simulations of the MRT instability provided a significant improvement on previous randomly initialised results and approached agreement with experiment.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-10-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 22
Issue Number 10


Open content in new tab

   Open content in new tab