Femtosecond laser driven high-flux highly collimated MeV-proton beam
- Advanced Photon Research Center, Kansai Research Establishment, Japan Atomic Energy Agency, 8-1 Umemi-dai, Kizu, Kyoto 619-0215 (Japan)
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology (Korea, Republic of)
- nstitute of Laser Engeneering, Osaka University, Osaka 565-0871 (Japan)
Highlly collimated energetic protons whose energies are up to 4 MeV are generated by an intense femtosecond Titanium Sappheire laser pulse interacting with a 7.5, 12.5, and 25 {mu}m-thick Polyimide tape target and 5 {mu}m-thick copper target. We find no clear difference on the proton spectra from 7.5, 12.5, and 25 {mu}m Polyimide tape target. The highest conversion efficiency from laser energy into protons of {approx}3% is observed with a 7.5 {mu}m thick Polyimide target. The quality of the proton beam is good enough to obtain a clear projection image of a mesh having 10 {mu}m line and space structure, installed into the passage of the beam. We obtain clear vertical lines on the proton intensity profiles from the copper target, which are considered to be transferred from the surface of the copper target. From it, we can restrict the size of the proton emitting region to be {approx}20 {mu}m.
- OSTI ID:
- 21148842
- Journal Information:
- AIP Conference Proceedings, Vol. 1024, Issue 1; Conference: 1. international symposium on laser-driven relativistic plasmas applied for science, industry and medicine, Kyoto (Japan), 17-20 Sep 2007; Other Information: DOI: 10.1063/1.2958186; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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