Polarized positron source for the linear collider, JLC

A comprehensive description of a polarized positron project is presented in terms of physics motivations for utilizing a polarized positron in electro n-positron collider experiments, a proof-of-principle experiment and a conc eptual design of a polarized positron source for the future linear collider JLC, In order to verify a proposed method of creating highly polarized pos itron beams via successive two fundamental processes, i.e, Compton scatteri ng and pair creation, we have been performing basic experiments both at KEE ; and BNL. First observation of positrons was made at KEK using an electron beam of 1.26 GeV and a laser of 2.33 eV. High-intensity picosecond X-rays were also generated at BNL using a specially designed Compton chamber. In o rder to realize polarized positron beams of the JLC which have considerably high intensity, i.e, 0.7 x 10(10) e(+)/pulse and a complicated multi-bunch structure, we have achieved a possible scheme for the Compton scattering s ystem and a positron capture section into an L-band linac. (C) 2000 Elsevie r Science B.V. All rights reserved.