| Autor: |
Peebles, J., Arefiev, A. V., Zhang, S., McGuffey, C., Spinks, M., Gordon, J., Gaul, E. W., Dyer, G., Martinez, M., Donovan, M. E., Ditmire, T., Park, J., Chen, H., McLean, H. S., Wei, M. S., Krasheninnikov, S. I., Beg, F. N. |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. E 98, 053202 (2018) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevE.98.053202 |
| Popis: |
The physics governing electron acceleration by a relativistically intense laser are not confined to the critical density surface, they also pervade the sub-critical plasma in front of the target. Here, particles can gain many times the ponderomotive energy from the overlying laser, and strong fields can grow. Experiments using a high contrast laser and a prescribed laser pre-pulse demonstrate that development of the pre-plasma has an unexpectedly strong effect on the most energetic, super-ponderomotive electrons. Presented 2D particle-in-cell simulations reveal how strong, voluminous magnetic structures that evolve in the pre-plasma impact high energy electrons more significantly than low energy ones for longer pulse durations and how the common practice of tilting the target to a modest incidence angle can be enough to initiate strong deflection. The implications are that multiple angular spectral measurements are necessary to prevent misleading conclusions from past and future experiments. |
| Databáze: |
arXiv |
| Externí odkaz: |
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