Absolute Kα line spectroscopy for cone-guided fast-ignition targets
1 Institute of Laser Engineering, Osaka U., Suita, Osaka 565-0871, Japan
2 Institute for Fusion Science, Toki, Gifu 509-5292, Japan
3 Graduate School of Engineering, Osaka U., Suita, Osaka 565-0871, Japan
4 Kansai Photon Science Institute, JAEA, Kyoto 619-0215, Japan
5 Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
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Published online: 15 November 2013
Absolute Kα line spectroscopy is proposed to study laser-plasma interactions taking place in cone-guided fast ignition targets. A transmission-type spectrometer was developed, and its absolute sensitivity was measured with laser-generated x-rays and radioisotopes, showing good agreement with theoretical predictions. The absolute yield of Au Kα line was mesured in the fast ignition experimental campaign perfomed at ILE, Osaka University. Assuming a single Maxwellian electron spectrum and one-way travel of hot electrons through the cone, energy transfer efficiency of incident LFEX laser to hot electrons was derived.
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