The effects of microstructure on propagation of laser-driven radiative heat waves in under-dense high-Z plasma
| Autor: | K. C. Brown, Gregory Kemp, Hiraku Matsukuma, Zhe Zhang, Akifumi Yogo, K. B. Fournier, J. F. Davis, Hiroaki Nishimura, J. D. Colvin, K. Koga, Nozomi Tanaka |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 25:032702 |
| ISSN: | 1089-7674 1070-664X |
| DOI: | 10.1063/1.5012523 |
| Popis: | This work was motivated by previous findings that the measured laser-driven heat front propagation velocity in under-dense TiO2/SiO2 foams is slower than the simulated one [Perez et al., Phys. Plasmas 21, 023102 (2014)]. In attempting to test the hypothesis that these differences result from effects of the foam microstructure, we designed and conducted an experiment on the GEKKO laser using an x-ray streak camera to compare the heat front propagation velocity in “equivalent” gas and foam targets, that is, targets that have the same initial density, atomic weight, and average ionization state. We first discuss the design and the results of this comparison experiment. To supplement the x-ray streak camera data, we designed and conducted an experiment on the Trident laser using a new high-resolution, time-integrated, spatially resolved crystal spectrometer to image the Ti K-shell spectrum along the laser-propagation axis in an under-dense TiO2/SiO2 foam cylinder. We discuss the details of the design of this ... |
| Databáze: | OpenAIRE |
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