Density-dependent shock Hugoniot of polycrystalline diamond at pressures relevant to ICF  

作　　者：Peng Wang Chen Zhang Shaoen Jiang Xiaoxi Duan Huan Zhang LiLing Li Weiming Yang Yonggang Liu Yulong Li Liang Sun Hao Liu Zhebin Wang 

机构地区：[1]Laser Fusion Research Center,China Academy of Engineering Physics,Mianyang 621900,China [2]Department of Plasma Physics and Fusion Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Matter and Radiation at Extremes》2021年第3期33-41,共9页极端条件下的物质与辐射（英文）

基　　金：supported by the National Key R&D Program of China(Grant No.2017YFA0403201);the Science Challenge Project(Grant No.TZ2016001);the National Natural Science Foundation of China(Grant Nos.11805183,12074351,and 11704351).

摘　　要：In inertial confinement fusion(ICF),polycrystalline diamond-referred to as high density carbon(HDC)-has become a promising ablator candidate.However,with smaller grain size and lower initial density,the equation of state(EOS)for HDC can deviate from that for single-crystal diamond,which could be a concern for ICF designs,but current experimental EOS studies for HDC are far from sufficient to clarify how initial density affects target compressibility.Presented here are measurements of the Hugoniot for HDC with an initial density of 3.23 g/cm^(3) at pressures of 17–26 Mbar.Combined with experimental data reported for nanocrystalline diamond(NCD),a stiffer compressibility of NCD due to lower initial density is confirmed.Two porous models are used for comparison and seem to offer better agreement compared with SESAME databases.Also,the effect of temperature on the Gruneisen parameter,which is usually neglected,might need to be considered for NCD under these conditions.The present data offer important support for EOS studies relevant to ICF and constrain the construction of wide-range EOS.

关 键 词：conditions. POLYCRYSTALLINE NEGLECTED 

分 类 号：O57[理学—粒子物理与原子核物理]