Absolute Kα line spectroscopy for cone-guided fast-ignition targets

H. Nishimura; Z. Zhang; T. Namimoto; S. Fujioka; M. Koga; H. Shiraga; T. Ozaki; T. Iwawaki; T. Morioka; K. Morita; H. Habara; K.A. Tanaka; M. Nishikino; T. Kawachi; A. Sagisaka; S. Orimo; A.S. Pirozhkov; K. Ogura; A. Yogo; H. Kiriyama; K. Kondo; T. Shimomura; S. Kanazawa; Y. Okano; H. Azechi

doi:10.1051/epjconf/20135913008

Proceedings

Open Access

EPJ Web of Conferences 59, 13008 (2013)
https://doi.org/10.1051/epjconf/20135913008

Absolute Kα line spectroscopy for cone-guided fast-ignition targets

H. Nishimura¹^a, Z. Zhang¹, T. Namimoto¹, S. Fujioka¹, M. Koga¹, H. Shiraga¹, T. Ozaki², T. Iwawaki³, T. Morioka³, K. Morita³, H. Habara¹^,3, K.A. Tanaka³, M. Nishikino⁴, T. Kawachi⁴, A. Sagisaka⁴, S. Orimo⁴, A.S. Pirozhkov⁴, K. Ogura⁴, A. Yogo⁴, H. Kiriyama⁴, K. Kondo⁴, T. Shimomura⁴, S. Kanazawa⁴, Y. Okano⁵, Team FG-02 Experimental Campaign and H. Azechi¹

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

Abstract

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

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