BEAM LOSS MONITORING AND CONTROL FOR HIGH INTENSITY BEAMS AT THE AGOR-FACILITY

The experiments at the AGOR facility require intense heavy ion beams. Typical examples are 1013 pps of 20Ne6+ at 23.3 MeV/A and ≥1012 pps 206Pb27+ at 8.5 MeV/A. To prevent damage to components by the beam (power density up to 1 kW/mm3 in unfavourable cases) a modular beam loss monitoring and control system has been developed for the cyclotron and high energy beam lines. The architecture of the system is described and the considerations for the major design choices discussed. The system uses the CAN-bus for communication and verification of system integrity. The injected beam is chopped at 1 kHz with a variable duty factor between 5 and 90 %. The beam intensity at injection and a number of locations in the high energy beam line is measured by inductive pick-ups. Furthermore, localized beam losses on slits and diaphragms are directly measured. When beam loss in any section exceeds the predefined maximum value, the duty factor of the beam is automatically reduced.IMP;Chinese Academy of Science