TITLE

Femtosecond laser driven high-flux highly collimated MeV-proton beam

AUTHOR(S)
Nishiuchi, M.; Daido, H.; Yogo, A.; Orimo, S.; Ogura, K.; Ma, J.; Sagisaka, A.; Mori, M.; Pirozhkov, A. S.; Kiriyama, H.; Bulanov, S. V.; Esirkepov, T. Zh.; Choi, Il Woo; Yu, Tae Jun; Shung, Jae Hee; Jeong, Tae Moon; Kim, Hyung Taek; Hong, Kyung-Ham; Noh, Young-Chul; Ko, Do-Kyeong
PUB. DATE
July 2008
SOURCE
AIP Conference Proceedings;7/15/2008, Vol. 1024 Issue 1, p137
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 μm-thick Polyimide tape target and 5 μm-thick copper target. We find no clear difference on the proton spectra from 7.5, 12.5, and 25 μm Polyimide tape target. The highest conversion efficiency from laser energy into protons of ∼3% is observed with a 7.5 μm thick Polyimide target. The quality of the proton beam is good enough to obtain a clear projection image of a mesh having 10 μm 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 ∼20 μm.
ACCESSION #
32841996

 

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