Production of gamma rays by pulsed laser beam Compton scattering off GeV-electrons using a non-planar four-mirror optical cavity

TL;DR

This paper reports the successful production of gamma rays via Compton scattering using a high finesse non-planar four-mirror optical cavity with a pulsed laser at KEK, demonstrating a flux of approximately 3 million gamma rays per second.

Contribution

It presents the first measurements of gamma ray flux produced with a non-planar four-mirror Fabry-Perot cavity using pulsed laser Compton scattering.

Findings

Produced a gamma ray flux of 2.7 ± 0.2 gamma rays per bunch crossing

Achieved approximately 3×10^6 gamma rays per second

Demonstrated the feasibility of using such cavities for gamma ray production

Abstract

As part of the positron source R&D for future $e^+-e^-$ colliders and Compton based compact light sources, a high finesse non-planar four-mirror Fabry-Perot cavity has recently been installed at the ATF (KEK, Tsukuba, Japan). The first measurements of the gamma ray flux produced with a such cavity using a pulsed laser is presented here. We demonstrate the production of a flux of 2.7 $\pm$ 0.2 gamma rays per bunch crossing ($\sim3\times10^6$ gammas per second) during the commissioning.