| Autor: |
N P Dover, C A J Palmer, M J V Streeter, H Ahmed, B Albertazzi, M Borghesi, D C Carroll, J Fuchs, R Heathcote, P Hilz, K F Kakolee, S Kar, R Kodama, A Kon, D A MacLellan, P McKenna, S R Nagel, D Neely, M M Notley, M Nakatsutsumi, R Prasad, G Scott, M Tampo, M Zepf, J Schreiber, Z Najmudin |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 18, Iss 1, p 013038 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/18/1/013038 |
| Popis: |
Spectrally-peaked proton beams of high charge ( ${E}_{{\rm{p}}}\approx 8\;{\rm{MeV}}$ , ${\rm{\Delta }}E\approx 4\;{\rm{MeV}}$ , $N\approx 50$ nC ) have been observed from the interaction of an intense laser ( $\gt {10}^{19}$ W cm ^−2 ) with ultrathin CH foils, as measured by spectrally-resolved full beam profiles. These beams are reproducibly generated for foil thicknesses 5–100 nm, and exhibit narrowing divergence with decreasing target thickness down to $\approx 8^\circ $ for 5 nm. Simulations demonstrate that the narrow energy spread feature is a result of buffered acceleration of protons. The radiation pressure at the front of the target results in asymmetric sheath fields which permeate throughout the target, causing preferential forward acceleration. Due to their higher charge-to-mass ratio, the protons outrun a carbon plasma driven in the relativistic transparency regime. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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