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Report No.

Ion acceleration in the interaction of a short pulse laser with a cluster-gas target

Fukuda, Yuji; Faenov, A. Y.; Tampo, Motonobu; Pikuz, T. A.*; Nakamura, Tatsufumi; Kando, Masaki; Hayashi, Yukio; Homma, Takayuki; Kawase, Keigo; Kotaki, Hideyuki; Yogo, Akifumi; Sakaki, Hironao; Pirozhkov, A. S.; Ogura, Koichi; Mori, Michiaki; Esirkepov, T. Z.; Koga, J. K.; Boldarev, A. S.*; Gasilov, V. A.*; Magunov, A. I.*; Kodama, Ryosuke*; Yamauchi, Tomoya*; Bolton, P.; Kato, Yoshiaki ; Tajima, Toshiki; Daido, Hiroyuki; Bulanov, S. V.

An approach for accelerating ions, with the use of a cluster-gas target and an ultrashort pulse laser of 150-mJ energy and 40-fs duration, is presented. Ions with energy 10-20 MeV per nucleon having a small divergence (full angle) of 3.4$$^{circ}$$ are generated in the forward direction, corresponding to approximately tenfold increase in the ion energies compared to previous experiments using solid targets. It is inferred from a particle-in-cell simulation that the high energy ions are generated at the rear side of the target due to the formation of a strong dipole vortex structure in subcritical density plasmas.



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