Measurement of preheat in aluminium target in indirect drive using the SGIII prototype facilities

8th International Conference on Inertial Fusion Sciences and Applications

Zhang, C.^1,2 ; Wang, Z.B.^3 ; Liu, H.^3 ; Peng, X.S.^3 ; Wang, F.^3 ; Ding, Y.K.^3 ; Zheng, J.^1,2

CAS Key Lab of Basic Plasma Physics, Hefei, Anhui

230026, China^1

Department of Modem Physics, University of Science and Technology of China, Hefei, Anhui 230026, China^2

Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang Sichuan

621900, China^3

关键词: Gas-filled hohlraum;    Indirect-drive;    Multi-group;    Preheated temperature;    Radiation source;    Shock fronts;    Surface motions;    Velocity interferometer system for any reflectors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012131/pdf
DOI  :  10.1088/1742-6596/688/1/012131

来源: IOP

【 摘 要 】

The velocity interferometer system for any reflector (VISAR) is used to demonstrate preheat effect in aluminium in indirect drive. The rear surface motion prior to shock front was observed and compared with a multi-group calculation. By properly adjusting the hard x-ray portion of the radiation source, the calculated rear surface motion fits well with the experimental results, which gives us confidence to predict the preheated temperature of the sample by hard x-rays. Further, the effect of hohlraum geometry is compared and discussed experimentally. The result suggests gas-filled hohlraum or hohlraum with low Z substrates should be considered to further reduce preheating.