Energy transport and isochoric heating of a low-Z, reduced-mass target irradiated with a high intensity laser pulse

被引:16
|
作者
Nishimura, H. [1 ]
Mishra, R. [2 ]
Ohshima, S. [1 ,3 ]
Nakamura, H. [1 ]
Tanabe, M. [1 ]
Fujiwara, T. [1 ]
Yamamoto, N. [1 ]
Fujioka, S. [1 ]
Batani, D. [4 ]
Veltcheva, M. [4 ]
Desai, T. [4 ]
Jafer, R. [4 ]
Kawamura, T. [5 ]
Sentoku, Y. [2 ]
Mancini, R. [2 ]
Hakel, P. [2 ]
Koike, F. [6 ]
Mima, K. [1 ]
机构
[1] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan
[2] Univ Nevada, Dept Phys, Reno, NV 89577 USA
[3] Kyoto Univ, Pioneering Res Unit Next Generat, Kyoto 6110011, Japan
[4] Univ Milano Bicocca, Dept Phys G Occhialini, I-20126 Milan, Italy
[5] Tokyo Inst Technol, Kanagawa 2268502, Japan
[6] Kitasato Univ, Phys Lab, Sch Med, Kanagawa 2288555, Japan
关键词
FAST-ELECTRON PENETRATION; X-RAYS; SPECTROSCOPY;
D O I
10.1063/1.3551591
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Heat transport in reduced-mass targets irradiated with a high intensity laser pulse was studied. K alpha lines from partially ionized chlorine embedded in the middle of a triple-layered plastic target were measured to evaluate bulk electron temperature in the tracer region inside the target. Two groups of K alpha lines, one from Cl+-Cl6+ (hereby called "cold K alpha"), and the other from Cl9+ and Cl10+ ("shifted K alpha") are observed from different regions within the target. Two-dimensional collisional particle-in-cell simulations show two distinct heating mechanisms occurring concurrently: uniform heating by refluxing electrons and local heating by diffusive electrons in the central region. These two heating processes, which made the target temperature distribution nonuniform, are responsible for producing the two groups of K alpha lines in the experiment. The blue-shift of cold K alpha lines in the experiment is the signature of higher temperatures achieved by the refluxing heating in smaller-mass targets. (C) 2011 American Institute of Physics. [doi:10.1063/1.3551591]
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页数:9
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