Speaker
Description
The injector linac of HIT (Heidelberg Ion Beam Therapy Centre) has delivered sufficient beam for patient treatments over the past years, but the particle transmission of the RFQ has continually remained below expectations. To reduce overall treatment times and to provide higher particle intensities for the upcoming Multi-Energy Operation (MEO) mode of the synchrotron, HIT has developed a new 4-rod RFQ in an innovation partnership with Bevatech GmbH. The design aims at significantly improving the transmission, with a target value of up to 95%, by using realistic particle distributions from the LEBT, implementing full dipole-field compensation, and integrating a newly designed and substantially shortened internal rebuncher for improved longitudinal matching into the subsequent IH-DTL. In addition, the RFQ components were manufactured with a dimensional accuracy of 50 µm or better, ensuring field symmetry and close correspondence with the simulated field distribution. The new RFQ is currently under commissioning on our dedicated test bench, and first results on field flatness, transmission, and RF voltage characteristics have been obtained and will be presented.
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