Abstract
By using three-dimensional particle-in-cell simulations, externally injected electron beam acceleration and radiation in donut-like wake fields driven by a LaguerreGaussian pulse are investigated. Studies show that in the acceleration process the total charge and azimuthal momenta of electrons can be stably maintained at a distance of a few hundreds of micrometers. Electrons experience low-frequency spiral rotation and high-frequency betatron oscillation, which leads to a synchrotron-like radiation. The radiation spectrum is mainly determined by the betatron motion of electrons. The far field distribution of radiation intensity shows axial symmetry due to the uniform transverse injection and spiral rotation of electrons. Our studies suggest a new way to simultaneously generate hollow electron beam and radiation source from a compact laser plasma accelerator.
Original language | English |
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Article number | 115204 |
Number of pages | 5 |
Journal | Chinese Physics B |
Volume | 26 |
Issue number | 11 |
Early online date | 29 Sept 2017 |
DOIs | |
Publication status | Published - 30 Nov 2017 |
Keywords
- Laguerre-Gaussian pulse
- laser plasma accelerator
- particle-in-cell simulations