Boosting laser-ion acceleration with multi-picosecond pulses
| Autor: | N. Iwata, Takayoshi Norimatsu, H. Shiraga, Kazuki Matsuo, N. Kamitsukasa, N. Miyanaga, Kohei Yamanoi, Akito Sagisaka, Yasunobu Arikawa, Akifumi Yogo, Shigeki Tokita, Sergei V. Bulanov, Sadaoki Kojima, Kunioki Mima, Shinsuke Fujioka, Mitsuo Nakai, Hitoshi Sakagami, Tomoyuki Johzaki, J. Kawanaka, Yasuhiko Sentoku, Hiroshi Azechi, Alessio Morace, Kiminori Kondo, Hideo Nagatomo, Hiroaki Nishimura, S. Tosaki, Masakatsu Murakami |
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| Rok vydání: | 2017 |
| Předmět: |
Multidisciplinary
Materials science Proton Nuclear Theory Energy conversion efficiency Pulse duration Laser 01 natural sciences Article Ponderomotive energy 010305 fluids & plasmas Ion law.invention Physics::Plasma Physics law Picosecond 0103 physical sciences Physics::Accelerator Physics Electron temperature Atomic physics Nuclear Experiment 010306 general physics |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/srep42451 |
| Popis: | Using one of the world most powerful laser facility, we demonstrate for the first time that high-contrast multi-picosecond pulses are advantageous for proton acceleration. By extending the pulse duration from 1.5 to 6 ps with fixed laser intensity of 1018 W cm−2, the maximum proton energy is improved more than twice (from 13 to 33 MeV). At the same time, laser-energy conversion efficiency 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. |
| Databáze: | OpenAIRE |
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