40 MeV proton beam generation with ultra-high intensity high-contrast Ti:Sap laser system

超高強度高コントラストチタンサファイアレーザーによる40MeV陽子線加速

西内 満美子; Pirozhkov, A. S.; 小倉 浩一; 谷本 壮*; 榊 泰直; Esirkepov, T. Z.; 余語 覚文; 福田 祐仁; 金崎 真聡; 匂坂 明人; Bulanov, S. V.; Bolton, P.; 近藤 公伯

Nishiuchi, Mamiko; Pirozhkov, A. S.; Ogura, Koichi; Tanimoto, Tsuyoshi*; Sakaki, Hironao; Esirkepov, T. Z.; Yogo, Akifumi; Fukuda, Yuji; Kanasaki, Masato; Sagisaka, Akito; Bulanov, S. V.; Bolton, P.; Kondo, Kiminori

初めての薄膜と超高強度レーザー相互作用によるイオン加速実験から10年以上が経とうとしているが、67.5MeV(大型レーザー)及び25MeV(コンパクトレーザー)の記録はそれほど更新されていない。われわれは、40fs of pulse width, 8J of energy, 10 contrastのチタンサファイアレーザーを、SUS2.5m厚みのターゲット上に10Wcmの強度に集光し、40MeVの陽子線加速に成功した。その結果について報告する。

Since the first observation of the energetic ion beam from the interaction between the Ultra-high intensity short pulse and solid density target, many experimental efforts have been extensively made in all over the world in order to extend the maximum energy of ions. In the past decade, the highest ion energy recorded is 67.5 MeV for the ps laser pulse from the building size single shot operation system and 25 MeV for the compact Ti:Sapphire laser system which can deliver repetitive sub-ps laser pulses. Here in this paper we present the extension of the maximum energy of protons from the interaction between the short-pulse compact laser system and soild thin-foil target. The laser parameters are 800 nm in wavelength, 40 fs of pulse width, 8 J of energy, 10 contrast and 3m 4m (FWHM) of focal spot. The achieved peak intensity is increased up to 10Wcm, which is also well confirmed by the measured electron temperature of 16 MeV.