Correlation between laser accelerated MeV proton and electron beams using simple fluid model for target normal sheath acceleration

流体モデルを使った、ターゲット法線シース加速におけるレーザー駆動イオンと電子との実験的相関関係の解釈

反保 元伸; 粟野 信哉*; Bolton, P.; 近藤 公伯; 三間 圀興*; 森 芳孝*; 中村 浩隆*; 中堤 基彰*; Stephens, R. B.*; 田中 和夫*; 谷本 壮*; 薮内 俊毅*; 兒玉 了祐*

Tampo, Motonobu; Awano, Shinya*; Bolton, P.; Kondo, Kiminori; Mima, Kunioki*; Mori, Yoshitaka*; Nakamura, Hirotaka*; Nakatsutsumi, Motoaki*; Stephens, R. B.*; Tanaka, Kazuo*; Tanimoto, Tsuyoshi*; Yabuuchi, Toshinori*; Kodama, Ryosuke*

High density energetic electrons that are created by intense laser plasma interactions drive MeV proton acceleration. Correlations between accelerated MeV protons and electrons are experimentally investigated at laser intensities in the range, 10 - 10 W/cm with -polarization. Observed proton maximum energies are linearly proportional to the electron slope temperatures with a scaling coefficient of about 10. Experimental results also indicate that, in the context of the simple analytical fluid model for transverse normal sheath acceleration, the ion (proton) density is comparable to density of the hot electron cloud near the target rear surface if an empirical acceleration time is assumed.