Abstract
We detail a method to produce a GeV-photon source with polarisation degree exceeding 91% and 78% (corresponding to a 96% and 89% fraction of the photons) for linear and circular polarised photons respectively and with a brilliance of the order of 1021photons/(smm2mrad20.1%BW). Using currently available multi-GeV electron bunches and laser pulses of moderately relativistic intensities, we show how the weakly nonlinear regime can produce photons polarised mainly parallel to the laser field. We demonstrate the robustness of this scheme by considering electron bunches of various emissivities colliding with linearly and circularly-polarised laser pulses at a range of angles.
Highlights
When an accelerated electron bunch scatters off a laser pulse of sufficient intensity, photons are produced in a series of harmonics corresponding to the number of absorbed laser photons
Using currently available multi-GeV electron bunches and laser pulses of moderately relativistic intensities, we show how the weakly nonlinear regime can produce photons polarised mainly parallel to the laser field
We demonstrate the robustness of this scheme by considering electron bunches of various emissivities colliding with linearly and circularly-polarised laser pulses at a range of angles
Summary
1 and 2, and the harmonic structure realised (see Supplementary Material in the appendix) In this way, the brilliance of the high-energy photons s > 0.11 can be improved to above 1022 photons/(s mm mrad2 0.1% BW), and the corresponding polarisation purity can be improved to about 97% (93%) for a linearly (circularly) polarised background as shown in Fig. 3 (d). Our scheme exploits the fact that, starting around the Compton edge, photons are mainly scattered along the electron’s propagation axis in one polarisation state To maximise this effect, a laser pulse with an intermediate intensity should be collided almost head-on with high-energy electrons (∼ 10 GeV). The brilliance and polarisation purity of the photon source can be further improved by employing electron beams of higher energy and smaller divergence angle and by increasing the spatio-temporal overlap with the colliding laser pulse.
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