Energy transport and isochoric heating of a low-Z, reduced-mass target irradiated with a high intensity laser pulse
- Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871 (Japan)
- Department of Physics, University of Nevada, Reno, Nevada 89577 (United States)
- Department of Physics 'G. Occhialini', University of Milano Bicocca, Milan I-20126 (Italy)
- Tokyo Institute of Technology, Yokohama, Kanagawa 226-8502 (Japan)
- Physics Laboratory, School of Medicine, Kitasato University, Sagamihara, Kanagawa 228-8555 (Japan)
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{sup +}-Cl{sup 6+} (hereby called ''cold K{alpha}''), and the other from Cl{sup 9+} and Cl{sup 10+} (''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.
- OSTI ID:
- 21535172
- Journal Information:
- Physics of Plasmas, Vol. 18, Issue 2; Other Information: DOI: 10.1063/1.3551591; (c) 2011 American Institute of Physics; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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