Author/Authors :
Muramatsu، نويسنده , , N. and Kon، نويسنده , , Y. and Daté، نويسنده , , S. and Ohashi، نويسنده , , Y. and Akimune، نويسنده , , H. and Chen، نويسنده , , J.Y. and Fujiwara، نويسنده , , M. and Hasegawa، نويسنده , , S. and Hotta، نويسنده , , T. and Ishikawa، نويسنده , , T. and Iwata، نويسنده , , T. and Kato، نويسنده , , Y. and Kohri، نويسنده , , H. and Matsumura، نويسنده , , T. and Mibe، نويسنده , , T. and Miyachi، نويسنده , , Y. and Morino، نويسنده , , Y. and Nakano، نويسنده , , T. and Nakatsugawa، نويسنده , , Y. and Ohkuma، نويسنده , , H. and Ohta، نويسنده , , T. and Oka، نويسنده , , M. and Sawada، نويسنده , , T. and Wakai، نويسنده , , A. and Yonehara، نويسنده , , K. and Yoon، نويسنده , , C.J. and Yorita، نويسنده , , T. and Yosoi، نويسنده , , M.، نويسنده ,
Abstract :
A laser-Compton backscattering beam, which we call a ‘Laser-Electron Photon’ beam, was upgraded at the LEPS beamline of SPring-8. We accomplished the gains in backscattered photon beam intensities by factors of 1.5–1.8 with the injection of two adjacent laser beams or a higher power laser beam into the storage ring. The maximum energy of the photon beam was also extended from 2.4 GeV to 2.9 GeV with deep-ultraviolet lasers. The upgraded beams have been utilized for hadron photoproduction experiments at the LEPS beamline. Based on the developed methods, we plan the simultaneous injection of four high power laser beams at the LEPS2 beamline, which has been newly constructed at SPring-8. As a simulation result, we expect an order of magnitude higher intensities close to 107 s−1 and 106 s−1 for tagged photons up to 2.4 GeV and 2.9 GeV, respectively.
