Specific Synchrotron Radiation Facilities Users Community (SpRUC)

At the BL31LEP, provided are polarized GeV-energy photons as a beam called the Laser-Electron Photon beam, which are generated by (deep-)ultraviolet-laser-induced Compton scattering from the circulating 8-GeV electrons. The wavelengths of such high energy-photons are shorter than the typical size of a hadron (~1 fm), and we use the LEP beams to investigate the sub-structure of a hadron with quark degrees of freedom. The LEP beam is unique, and quite different from X-rays used in other beamlines at SPring-8. It is mostly utilized for promoting quark-nuclear physics. The main activities of this research group are;

1. To share advanced technologies and results obtained from hadron physics experiments of photo-nuclear reactions using the LEP beams,
2. To promote usage and application of the LEP beam, such as testing detectors using GeV-energy photons or electrons/positrons produced from the photons,
3. To exchange technologies for photon beam production and radiation detection, and cooperation with other experiments using GeV-energy Bremsstrahlung-photon beams or MeV-energy LEP beams, and
4. To strengthen collaborative research with other researchers promoting hadron physics, such as meson beam users at J-PARC.

We are aiming at sharing information among users, expanding users, and making progress in future usages with the above activities. The GeV-energy LEP beam is now available only at SPring-8. Our goal for holding workshops is to maximize the outputs of promoting hadron physics using LEP beams together with development of new technologies for increasing the beam intensity and new detectors.