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As part of the positron source R&D for future $e^+-e^-$ colliders and Comptonbased compact light sources, a high finesse non-planar four-mirror Fabry-Perotcavity has recently been installed at the ATF (KEK, Tsukuba, Japan). The firstmeasurements of the gamma ray flux produced with a such cavity using a pulsedlaser 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) duringthe commissioning.

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