Speakers
Description
In charged particle therapy, high energy layer switching times prolong beam delivery time, limiting treatment efficiency and accuracy. The TURBO (Technology for Ultra-Rapid Beam Operation) project aims to build a low-energy (0.5-3 MeV) demonstrator beamline for proton therapy with a large momentum acceptance (±42%), enabling rapid delivery over the full clinical energy range, alleviating this bottleneck. Novel beam diagnostic instrumentation is required to monitor key parameters of the beamline constructed for the University of Melbourne’s Pelletron accelerator, which operates at low energies and high current densities. We develop a pepper-pot mask-based method to measure beam phase space distribution and quantify the emittance, and a multi-layer Faraday cup (MLFC) to measure energy distribution. We reconstruct the full four-dimensional transverse phase space of the proton beam using a steel Pepper-pot mask with a grid consisting of 21 x 21 holes with 50 μm radius and 500 μm spacing, as well as verify energies from 0.5-3 MeV using an MLFC with alternating conducting (aluminium) and insulating (Kapton) layers with a thickness of 2.0 μm and 2.5 μm respectively. This work now enables the completion of the beam shaping section, and integration of a fixed-field, closed-dispersion beam transport section, key next steps toward assessing TURBO’s potential to shorten beam delivery times.
Funding Agency
The University of Melbourne
National Institutes of Health (NIH) NCI R37CA2883437
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