摘要
In this paper we present a high repetition rate experimental platform for examining the spatial structure and evolution of Biermann-generated magnetic fields in laser-produced plasmas.We have extended the work of prior experiments,which spanned over millimeter scales,by spatially measuring magnetic fields in multiple planes on centimeter scales over thousands of laser shots.Measurements with magnetic fiux probes show azimuthally symmetric magnetic fields that range from 60 G at 0.7 cm from the target to 7 G at 4.2 cm from the target.The expansion rate of the magnetic fields and evolution of current density structures are also mapped and examined.Electron temperature and density of the laser-produced plasma are measured with optical Thomson scattering and used to directly calculate a magnetic Reynolds number of 1.4×10^(4),confirming that magnetic advection is dominant at≥1.5 cm from the target surface.The results are compared to FLASH simulations,which show qualitative agreement with the data.
基金
the Department of Energy(DOE)under award number DE-SC0019011
the National Nuclear Security Administration(NNSA)Center for Matter under Extreme Conditions under award number DE-NA0003842
the National Science Foundation Graduate Fellowship Research Program under award number DGE-1650604
support by the U.S.DOE NNSA under Subcontracts 536203 and 630138 with Los Alamos National Laboratory,Subcontract B632670 with LLNL and support from the Cooperative Agreement DE-NA0003856 to the Laboratory for Laser Energetics University of Rochester。
