Coaxial High Order Mode(HOM) couplers have been fabricated at Peking University and their RF performance has been measured on a test device consisting of a coax
HIRFL-CSR, a new heavy ion cooler-storage-ring system at IMP, had been in commissioning since the beginning of 2006. In the two years of 2006 and 2007 the CSR c
The principle of the method for the BESⅢ TOF calibration using cosmic ray data without magnetic field are reported in this paper. After applying calibration co