@misc{oai:repo.qst.go.jp:00066606,
 author = {ドーバー, ニコラスピーター and Nishiuchi, Mamiko and Sakaki, Hironao and Kondo, Kotaro and Alkhimova, M.A. and Ya., Faenov A. and Fukuda, Yuuji and Hata, M. and Iwata, N. and Kiriyama, Hiromitsu and Kevin, Koga James and Miyahara, Takumi and Nishitani, Keita and Ogura, Koichi and Pikuz, T.A. and Pirozhkov, Alexander and Sagisaka, Akito and Sentoku, Y. and Watanabe, Y. and Kando, Masaki and Kondo, Kiminori and ドーバー ニコラス ピーター and 西内 満美子 and 榊 泰直 and 近藤 康太郎 and 福田 祐仁 and 桐山 博光 and コーガ ジェームズ and 宮原 巧 and 西谷 勁太 and 小倉 浩一 and ピロジコフ アレキサンダー and 匂坂 明人 and 神門 正城 and 近藤 公伯},
 month = {Sep},
 note = {The behaviour of high power laser driven ion generation at the extreme intensities available at state-of-the-art and next-generation laser facilities is an important topic for realising potential applications.  One of the simplest schemes for proton sources for applications is sheath acceleration, for which different established models predict varying dependence on laser and target parameters, motivating experimental investigation.  
We will present experimental data investigating sheath driven proton acceleration using the ultra-high intensity, high contrast J-KAREN-P laser. A ~10 J, 40 fs pulse was focused to an intensity ~5x1021 Wcm-2, generating protons up to 50 MeV from freestanding ~μm foils, and up to 40 MeV at 0.1 Hz from a 5 μm tape target, with conversion efficiencies >1% into protons above 10 MeV.  Scaling with different methods of laser intensity variation will be discussed.  Simultaneous measurement of the electron distribution and optical probing of plasma formation on the rear target surface provide insights into electron absorption.  In particular, target irradiation at 45º angle of incidence is shown to produce a systematic asymmetry in both rear surface sheath formation and resultant proton distribution due to the initial non-thermal electron distribution, causing the highest energy protons to be steered partly towards the laser axis., EAAC2017参加},
 title = {Experimental investigation of laser-driven proton sheath acceleration in the ultra-short pulse, ultra-high intensity regime},
 year = {2017}
}