Speaker
Description
The recent availability of mixed 4He2+ and 12C6+ beams for research on online monitoring in carbon ion therapy is introducing new challenges for slow extraction. Firstly, the two ion species feature a small but non-negligible rigidity difference that depends on the proximity of the extraction energy to the transition energy (0.065–0.14% in a PIMMS-like synchrotron). In addition, in the current experiments at MedAustron the two ion species are generated in separate sources and merged in the synchrotron via a sequential multiturn injection scheme, which places them in distinct regions in horizontal phase space. Both effects cause species-dependent dynamics during transverse RF knockout (RFKO) slow extraction. To still ensure a stable He:C ratio stable over the spill, the RFKO excitation and optics need to be tailored accordingly.
This contribution summarises ongoing mixed species RFKO studies at MedAustron. Measurements and Xsuite simulations are presented to discuss how tailored RFKO excitation can help stabilise the He:C ratio throughout the spill. Experimentally, the time-resolved He:C ratio of the extracted beam is measured using multiple range-separated ionization chambers in the experimental room.
Funding Agency
Austrian Ministry of Education, Science, and Research; RTI-Strategy Lower Austria 2027
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