1. Enhancing positron production using front surface target structures.
- Author
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Jiang, S., Link, A., Canning, D., Fooks, J. A., Kempler, P. A., Kerr, S., Kim, J., Krieger, M., Lewis, N. S., Wallace, R., Williams, G. J., Yalamanchili, S., and Chen, Hui
- Subjects
ELECTRON kinetic energy ,SURFACE structure ,POSITRONIUM ,POSITRONS ,PAIR production - Abstract
We report a target design which produced a substantial gain in relativistic electron-positron pair production using high-intensity lasers and targets with large-scale micro-structures on their surface. Comparing to an unstructured target, a selected Si microwire array target yielded a near 100% increase in the laser-to-positron conversion efficiency and produced a 10 MeV increase in the average emitted positron energy under nominally the same experimental conditions. We had established a multi-scale particle-in-cell simulation scheme to simulate both the laser absorption and the subsequent pair productions in a thick metal target. The experimental results are supported by the simulations demonstrating the performance increase is due to a higher conversion efficiency of laser energy into electrons with kinetic energies greater than 10 MeV due to enhanced direct laser acceleration of electrons enabled by the microwire array. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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