Photon generation by laser-Compton scattering at the KEK-ATF

Abstract

We performed a photon generation experiment by laser-Compton scattering at the KEK-ATF, aiming to develop a Compton based polarized positron source for linear colliders. In the experiment, laser pulses with a 357 MHz repetition rate were accumulated and their power was enhanced by up to 250 times in the Fabry-Perot optical resonant cavity. We succeeded in synchronizing the laser pulses and colliding them with the 1.3 GeV electron beam in the ATF ring while maintaining the laser pulse accumulation in the cavity. As a result, we observed 26.0 +/- 0.1 photons per electron-laser pulse crossing, which corresponds to a yield of 10^8 photons in a second.Comment: 3 pages, 5 figures, Preprint submitted to TIPP09 Proceedings in NIM

Design and optimization of a highly efficient optical multipass system forγ-ray beam production from electron laser beam Compton scattering

“…Fabry-Perot resonators are indeed best suited for high repetition rate lasers (above tens of megahertz) because the laser oscillator has to be locked to the cavity round-trip frequency with a very high accuracy and therefore with a feedback bandwidth between 10 kHz-1 MHz. Two-and four-mirror cavities have been successfully used to produce γ-ray beams in the continuous [12,13] and high repetition rate regime [14,15]. Another technique, namely the amplifier burst mode [16], is also being investigated but very few results have been reported so far.…”

Scientific opportunies for bERLinPro 2020+, report with ideas and conclusions from bERLinProCamp 2019

“…With a 30 MeV top energy we can reach 20 kV photons from an 800 nm laser. In a basic scheme we can follow an approach implemented at the KEK-ATF 4 . Furthermore the idea for a zig-zag geometry to obtain head-on collision was discussed.…”

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

“…The red arrow indicates the direction of propagation of the gamma rays produced. The grey box indicates the gamma ray detector (adapted from [14]).…”