Study of the Ionization Dynamics and Equation of State of a Strongly Coupled Plasma

Shepherd, R ; Audebert, P ; Geindre, J P ; Iglesias, C ; Foord, M ; Rogers, F ; Gauthier, J C ; Springer, P

Lawrence Livermore National Laboratory

关键词: Comets;    Lawrence Livermore National Laboratory;    71;    Transients;    Absorption;   

DOI  :  10.2172/15003859
RP-ID  :  UCRL-ID-152601
RP-ID  :  W-7405-ENG-48
RP-ID  :  15003859

美国|英语

来源: UNT Digital Library

【 摘 要 】

Preliminary experiments to study the ionization dynamics and equation of state of a strongly coupled plasma have been performed at the LLNL COMET laser facility. In these experiment, a 1.0 J, 500 fs, 532 nm laser was used to create a uniform, warm dense plasma.The primary diagnostic, Fourier Domain Interferometry (FDI), was used to provide information about the position of the critical density of the target and thus the expansion hydrodynamics, laying the ground work for the plasma characterization. The plasmas were determined to be strongly coupled. In addition work was performed characterizing the back-lighter. A von Hamos spectrograph coupled to a 500 fs X-ray streak camera (TREX-VHS) developed at LLNL was used for these measurements. This diagnostic combines high collection efficiency ({approx} 10{sup -4} steradians) with fast temporal response ({approx} 500 fs), allowing resolution of extremely transient spectral variations. The TREX-VHS will be used to determine the time history, intensity, and spectral content of the back-lighter resulting in absorption measurements that provide insight into bound states in strongly coupled conditions.