Towards the Optimisation of Direct Laser Acceleration
| Autor: | Hussein, A. E., Arefiev, A. V., Batson, T., Chen, H., Craxton, R. S., Davies, A. S., Froula, D. H., Gong, Z., Haberberger, D., Ma, Y., Nilson, P. M., Theobald, W., Wang, T., Weichman, K., Williams, G. J., Willingale, L. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Experimental measurements using the OMEGA EP laser facility demonstrated direct laser acceleration (DLA) of electron beams to (505 $\pm$ 75) MeV with (140 $\pm$ 30)~nC of charge from a low-density plasma target using a 400 J, picosecond duration pulse. Similar trends of electron energy with target density are also observed in self-consistent two-dimensional particle-in-cell simulations. The intensity of the laser pulse is sufficiently large that the electrons are rapidly expelled from along the laser pulse propagation axis to form a channel. The dominant acceleration mechanism is confirmed to be DLA and the effect of quasi-static channel fields on energetic electron dynamics is examined. A strong channel magnetic field, self-generated by the accelerated electrons, is found to play a comparable role to the transverse electric channel field in defining the boundary of electron motion. Comment: 21 pages, 7 figures |
| Databáze: | arXiv |
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