The open archive for STFC research publications

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
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 , CI , STFC
Funding Information EC, Seventh Framework (284464); EPSRC (EP/E035728/1, EP/K022415/1 and EP/J003832/1)
Related Research Object(s):
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
Showing record 1 of 1
Science and Technology Facilities Council Switchboard: 01793 442000