Bright gamma-rays from betatron resonance acceleration in near critical density plasma
Abstract
We show that electron betatron resonance acceleration by an ultra-intense ultra-short laser pulse in a near critical density plasma works as a high-brightness gamma-ray source. Compared with laser plasma X-ray sources in under-dense plasma, near critical density plasma provides three benefits for electron radiation: more radiation electrons, larger transverse amplitude, and higher betatron oscillation frequency. Three-dimensional particle-in-cell simulations show that, by using a 7.4J laser pulse, 8.3mJ radiation with critical photon energy 1MeV is emitted. The critical photon energy increases with the incident laser energy %faster than a linear relation. as , and the corresponding photon number is proportional to . A simple analytical synchrotron-like radiation model is built, which can explain the simulation results.
Keywords
Cite
@article{arxiv.1310.6164,
title = {Bright gamma-rays from betatron resonance acceleration in near critical density plasma},
author = {B. Liu and H. Y. Wang and D. Wu and J. Liu and C. E. Chen and X. Q. Yan and X. T. He},
journal= {arXiv preprint arXiv:1310.6164},
year = {2013}
}