@article{oai:repo.qst.go.jp:00048038,
 author = {Yogo, Akifumi and Mima, Kunioki and Iwata, Natsumi and Tosaki, Shota and Morace, Alessio and Arikawa, Yasunobu and Fujioka, Shinsuke and Johzaki, Tomoyuki and Sentoku, Yasuhiko and Nishimura, Hiroaki and Sagisaka, Akito and Matsuo, Kazuki and Kamitsukasa, Naoyoshi and Kojima, Sadaoki and Nagatomo, Hideo and Nakai, Mitsuo and Shiraga, Hiroyuki and Murakami, Masakatsu and Tokita, Shigeki and Kawanaka, Junji and Miyanaga, Noriaki and Yamanoi, Kohei and Norimatsu, Takayoshi and Sakagami, Hitoshi and Bulanov, Sergey and Kondo, Kiminori and Azechi, Hiroshi and 匂坂 明人 and ブラノフ セルゲイ and 近藤 公伯},
 journal = {Scientific Reports (Online Only URL:http://www.nature.com/srep/index.html)},
 month = {Feb},
 note = {Using one of the world most powerful laser facility, we demonstrate for the  rst time that high-contrast multi-picosecond pulses are advantageous for proton acceleration. By extending the pulse duration from 1.5 to 6 ps with  xed laser intensity of 10^18 W cm^−2, the maximum proton energy is improved more than twice (from 13 to 33 MeV). At the same time, laser-energy conversion e ciency into the MeV protons is enhanced with an order of magnitude, achieving 5% for protons above 6 MeV with the 6 ps pulse duration. The proton energies observed are discussed using a plasma expansion model newly developed that takes the electron temperature evolution beyond the ponderomotive energy in the over picoseconds interaction into account. The present results are quite encouraging for realizing ion-driven fast ignition and novel ion beamlines.},
 pages = {42451-1--42451-10},
 title = {Boosting laser-ion acceleration with multi-picosecond pulses},
 volume = {7},
 year = {2017}
}