Development of a three dimensional four mirror optical cavity for laser-Compton scattering

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 724; pp. 63 - 71
• Main Authors: Akagi, T., Araki, S., Funahashi, Y., Honda, Y., Kataoka, H., Kon, T., Miyoshi, S., Okugi, T., Omori, T., Sakaue, K., Shimizu, H., Takahashi, T., Tanaka, R., Terunuma, N., Urakawa, J., Washio, M., Yoshitama, H.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-10-2013
• Subjects: Accelerators; Beams (radiation); Compton; Holes; ILC; Laser beams; Non-planar cavity; Optical cavity; Photons; Polarized positron source; Pulse laser stacking; Scattering; Spectrometers; Three dimensional; Polarized positron source; ILC; Compton; Non-planar cavity; Pulse laser stacking; Optical cavity
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2013.04.066

This paper describes a design and performance of a three-dimensional 4-mirror optical cavity for development of intense photon sources by laser-Compton scattering. We achieved the finesse of 4000 and average power of 2.6kW in the cavity with the vertical laser beam spot size of 13±1μm in σ at the laser–electron interaction point. As a result, we observed 124±1 photons with average energy of 24MeV per beam crossing, which corresponds to the generation of 2.7×108 photons per second.
•We developed a 3D 4-mirror optical cavity for laser-Compton scattering.•Finesse of 4040±110 was achieved in an accelerator environment.•The vertical laser beam spot size was 13±1μm in σ at the laser–electron IP.•We observed 2.7×108 photons per second with average energy of 24MeV.