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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/12239733
Record Status
Checked
Record Id
12239733
Title
Enhanced proton beam collimation in the ultra-intense short pulse regime
Contributors
JS Green (STFC Rutherford Appleton Lab.)
,
NP Dover
,
M Borghesi
,
CM Brenner (STFC Rutherford Appleton Lab., and Strathclyde Univ.)
,
FH Cameron (STFC Rutherford Appleton Lab.)
,
DC Carroll (STFC Rutherford Appleton Lab., and Strathclyde Univ.)
,
PS Foster (STFC Rutherford Appleton Lab.)
,
P Gallegos (STFC Rutherford Appleton Lab., and Strathclyde Univ.)
,
G Gregori
,
P McKenna (Strathclyde Univ.)
,
CD Murphy
,
Z Najmudin
,
CAJ Palmer
,
R Prasad
,
L Romagnani
,
KE Quinn
,
J Schreiber
,
MJV Streeter
,
S Ter-Avetisyan
,
O Tresca (Strathclyde Univ.)
,
M Zepf
,
D Neely (STFC Rutherford Appleton Lab., and Strathclyde Univ.)
Abstract
The collimation of proton beams accelerated during ultra-intense laser irradiation of thin aluminum foils was measured experimentally whilst varying laser contrast. Increasing the laser contrast using a double plasma mirror system resulted in a marked decrease in proton beam divergence (20° to <10°), and the enhanced collimation persisted over a wide range of target thicknesses (50 nm–6 µm), with an increased flux towards thinner targets. Supported by numerical simulation, the larger beam divergence at low contrast is attributed to the presence of a significant plasma scale length on the target front surface. This alters the fast electron generation and injection into the target, affecting the resultant sheath distribution and dynamics at the rear target surface. This result demonstrates that careful control of the laser contrast will be important for future laser-driven ion applications in which control of beam divergence is crucial.
Organisation
CLF
,
CLF-HPL
,
CLF-ASTRA
,
CI
,
STFC
Keywords
Funding Information
EU
, Seventh Framework (284464);
EPSRC
(EP/E035728/1, EP/K022415/1 and EP/J003832/1)
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Plasma Phys Contr F
56, no. 8 (2014): 084001.
doi:10.1088/0741-3335/56/8/084001
2014
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