Quantitative measurement of hard X-ray spectra from laser-driven fast ignition plasma |
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| Affiliation: | 1. Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan;2. National Institute for Fusion Science, LHD, High Temperature Plasma G. 322-6 Oroshi Toki, Gifu 509-5292, Japan;3. The Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima 739-8527, Japan;4. Institute for Laser Technology, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan;5. Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;6. Quantum Beam Science Directorate, Kansai Photon Science Institute, JAEA, Kyoto 619-0215, Japan;7. Laser Research Center for Molecular Science, Institute for Molecular Science, National Institute of Natural Science, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan;1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;2. State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, China;3. Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40513, USA;4. Department of Wind Energy, Risø Campus, Technical University of Denmark, Roskilde, DK 4000, Denmark;1. Program of Physics applied to Medicine and Biology of the Physics Department, Ribeirão Preto School of Philosophy, Science and Literature of the São Paulo University (DF/FFCLRP-USP), Av. Bandeirantes 3900, 14040-901, Ribeirão Preto, São Paulo, Brazil;2. National Institute of Science and Technology Radiation Metrology in Medicine, Brazil |
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| Abstract: | Absolute Kα line spectroscopy is proposed for studying laser–plasma interactions taking place in the Au cone-guided fast ignition targets. X-ray spectra ranging from 20 to 100 keV were quantitatively measured with a Laue spectrometer composed of a cylindrically curved crystal and a filter-absorption method for Bremsstrahlung continuum emission. The absolute sensitivities of the Laue spectrometer systems were calibrated using pre-characterized laser-produced X-ray sources and radioisotopes. The integrated reflectivity for the crystal is in good agreement with predictions by an X-ray diffraction code. The energy transfer efficiency from incident laser beams to hot electrons, as the energy transfer mechanism, is derived from this work. The absolute yield of Au and Ta Kα lines were measured in the fast ignition experimental campaign performed at Institute of Laser Engineering, Osaka University. Applying the hot electron spectrum information from electron spectrometer and scaling laws, the energy transfer efficiency from the incident LFEX, a kJ-class PW laser, to hot electrons was derived for the first time. |
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| Keywords: | X-ray spectroscopy Laser–plasma interaction Hard X-rays Fast ignition |
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