Speaker
Description
SIS18, the main synchrotron of the present GSI accelerator complex, will serve as booster for the FAIR facility. Several major and minor upgrade programs were realized since 2008 to improve SIS18 for this purpose. We will report on new capabilities of the synchrotron for present and future user operation, which were not directly attributed to FAIR injector operation.
Namely, a spill feedback system to control macroscopic spill shape and optimize spill microstructure during slow extraction. The operation of SIS18 with the new FAIR control system in conjunction with the RF upgrades allows beam operation without restrictions at lower injection energies. Acceleration of two beams consisting of ions with different mass to charge ratios at different revolution frequencies during acceleration are now possible and were successfully demonstrated in 2025. Possible users are medical research and plasma physics.
As outlook we describe future plans for beam shaping before fast extraction for medical research.
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