| Autor: |
D. P. Higginson, J. Kim, G. M. Petrov, D. C. Swift, J. A. Cobble, D. L. Bleuel, J. A. Frenje, V. Yu. Glebov, C. Stoeckl, J. M. McNaney, F. N. Beg |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Physical Review Research, Vol 4, Iss 3, p 033113 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.4.033113 |
| Popis: |
A high-intensity laser irradiating a few-μm solid foil will accelerate ions from the bulk of the target as well as protons from a surface contaminant layer. Experimental measurements of ion spectra using the OMEGA EP laser (0.25–1 kJ, 10 ps) show, as suggested previously [Petrov et al., Phys. Plasmas 17, 103111 (2010)1070-664X10.1063/1.3497002], that at a laser fluence exceeding 1 J/μm^{2}, the contaminant layer is accelerated enough that ions from the bulk of the target are more effectively accelerated. When using CD_{2} as a target, the high fluence results in a 100-fold increase in deuteron acceleration efficiency (near 1% of laser energy) compared to subthreshold fluence. This is found to be due to the fact that the deuterons have a higher density at many locations during acceleration, allowing a larger electric field to develop, leading to improved efficiency. Using a pitcher-catcher setup, these deuterons, as well as protons from the contaminant layer, strike a LiF target and generate neutrons via (d,n) and (p,n) nuclear reactions. CR39 plastic and nuclear activation detectors measured broadband neutron yields of 4×10^{9}sr^{−1} and yields of 10^{8}sr^{−1} for neutrons above 11 MeV. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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