The collimation system design for the Booster Ring in the HIAF project

Abstract The dynamic vacuum effect induced by the charge exchange beam loss will seriously limit the ion intensity and beam lifetime in the Booster Ring (BRing) of the High-Intensity Heavy Ion Accelerator Facility (HIAF). A dedicated collimationsystem has been designed to decrease the ion-induced gas desorption to suppress the dynamic vacuum effect. In order to reach 100% collimationefficiency, the optics latticeof BRing has been changed from original FODO to DBA structure. The distance between dipole and quadrupole in each lattice cell of BRing was optimized to maintain the high collimationefficiency. The hardware structure of the collimatorwas designed based on the simulation result and mechanical instrument controlprinciple in the UHV vacuum system. The vacuum chamberand pump installment with collimatorshas been designed. A prototype collimatorwith vacuum chamberhas been installed on the beamline to measure the gas desorption with beam and verify the availability and reliability of mechanical design. This prototype collimatorhas passed factory field tests and used to measure the gas desorption rate with the beam 112 Sn 26 + at the energy 150 MeV/u successfully.