Acceleration of Quasi-Monoenergetic Electrons to 15 MeV at 1 kHz with <2.7 mJ, 5 fs Pulses
Abstract
We demonstrate acceleration of quasi-monoenergetic electron bunches with a narrow angular divergence up to 15 MeV by focusing 2.7 mJ, 5 fs pulses at a kHz repetition rate onto a near-critical hydrogen gas jet. In previous experiments, we showed that the use of near-critical gas densities enabled acceleration of electrons to MeV energies using mJ-scale pulses from a kHz system by lowering the critical power for self-focusing. These bunches, generated in the self-modulated (SM-LWFA) regime, had broad angular divergences and exponential energy distributions. Our recent experiments operating in the bubble regime with 7 fs, 2.5 mJ pulses generated in a hollow-core fiber (HCF) saw the acceleration of quasi-monoenergetic electrons to 5 MeV with an improved angular spread. In this work, we employ 5 fs, 2.7 mJ pulses generated in an HCF from elliptically polarized pulses to accelerate quasi-monoenegetic electron bunches to 15 MeV with 7 mrad divergence and 4 mrad shot-to-shot jitter.
This work is funded by the US Dept. of Energy (DESC0015516) and the National Science Foundation (PHY1619582).- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2020
- Bibcode:
- 2020APS..DPPG20011L