Deceleration-stage Rayleigh–Taylor growth in a background magnetic field studied in cylindrical and Cartesian geometries  

作　　者：C.Samulski B.Srinivasan M.J.-E.Manuel R.Masti J.P.Sauppe J.Kline 

机构地区：[1]Virginia Polytechnic Institute and State University,Blacksburg,Virginia 24060,USA [2]General Atomics,P.O.Box 85608,San Diego,California 92186,USA [3]Los Alamos National Laboratory,P.O.Box 1663,Los Alamos,New Mexico 87545,USA

出　　处：《Matter and Radiation at Extremes》2022年第2期41-52,共12页极端条件下的物质与辐射（英文）

基　　金：This work was supported by the Office of Science of the U.S.Department of Energy under Award Nos.DE-SC0018993,DE-SC0016515,and DE-SC0022319;the High Energy Density Laboratory Plasmas subprogram of the Fusion Energy Sciences program and under Award No.DE-SC0020055 by the Financial Assistance Program;This work was also supported through a Los Alamos National Laboratory subcontract to Virginia Tech under Contract No.463281.

摘　　要：Experiments have identified the Rayleigh–Taylor(RT)instability as one of the greatest obstacles to achieving inertial confinement fusion.Consequently,mitigation strategies to reduce RT growth and fuel–ablator mixing in the hotspot during the deceleration phase of the implosion are of great interest.In this work,the effect of seed magnetic fields on deceleration-phase RT growth are studied in planar and cylindrical geometries under conditions relevant to the National Ignition Facility(NIF)and Omega experiments.The magnetohydrodynamic(MHD)and resistive-MHD capabilities of the FLASH code are used to model imploding cylinders and planar blast-wave-driven targets.Realistic target and laser parameters are presented that suggest the occurrence of morphological differences in late-time RT evolution in the cylindrical NIF case and a measurable difference in spike height of single-mode growth in the planar NIF case.The results of this study indicate the need for target designs to utilize an RT-unstable foam–foam interface in order to achieve sufficient magnetic field amplification to alter RT evolution.Benchmarked FLASH simulations are used to study these magnetic field effects in both resistive and ideal MHD.

关 键 词：FLASH CYLINDRICAL magnetic 

分 类 号：O18[理学—数学]