https://doi.org/10.1051/epjconf/20135913008
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
a e-mail: nishimu@ile.osaka-u.ac.jp
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.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
