Direct Laser-Driven Quasi-Isentropic Compression on HEAVEN-I Laser
ZHANG Pin-Liang1, TANG Xiu-Zhang1**, LI Ye-Jun1, WANG Zhao1, TIAN Bao-Xian1, YIN Qian1, LU Ze1, XIANG Yi-Huai1, GAO Zhi-Xing1, LI Jing1, HU Feng-Ming1, GONG Zi-Zheng2
1High Power Excimer Laser Laboratory, China Institute of Atomic Energy, Beijing 102413 2National Key Laboratory of Science and Technology on Reliability and Environment Engineering, Beijing Institute of Spacecraft Environment Engineering, Beijing 100094
Abstract：The HEAVEN-I laser is used for direct drive quasi-isentropic compression up to ～18 GPa in samples of aluminum without being temporal pulse shaped. The monotonically increasing loading is with a rise time over 17 ns. The compression history is well reproduced by the 1D radiation hydrodynamics simulation. We find that a small shock precursor where the backward integration method cannot process is formed at the beginning of illumination. We compare the loading process of HEAVEN-I with the typical profile (concave down, prefect pulse shape), the results show that a typical profile can obtain more slowly rising and higher pressure, and the shock precursor has significant effects on temperature and entropy production. However, it is demonstrated that the HEAVEN-I is an excellent optical source for direct laser-driven quasi-isentropic compression, even if it produces more temperature rise and entropy than the typical profile.
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2015, Vol. 32 
