Speaker
Description
In radiotherapy, treatment beams warrant fine margins due to the goal of sparing the patient’s healthy tissue. Studies have found that to counteract Bragg peak range deviations, safety margins of approximately less than 5% around the target volume are normally used in clinical settings. Hence, diagnostics would be improved if they cause as close to zero beam perturbation as possible. A minimally-invasive gas jet beam profile monitor for medical treatment facilities is being developed at the Cockcroft Institute (UK) to provide online monitoring. The monitor operates a thin, low-density, gas jet curtain, transecting with the beam. A proof-of-concept experimental study was carried out to quantify the degree of perturbation the gas jet has on a beam, using a 10 keV electron gun. Any changes in beam profile and current were measured via a scintillator screen and Faraday cup respectively in path of the beam. In the future, a simulation study will be carried out using BDSIM, a Beam Delivery Simulation program built on GEANT4, with the experimental beam parameters. This contribution examines experimental study into the perturbation experienced by a particle beam from a gas jet monitor.
Funding Agency
Supported by the STFC Grant ST/W000687/1, the HL-LHC-UK project funded by STFC and CERN, the STFC Cockcroft core grant No. ST/G008248/1 and EuPRAXIA grant No. 101073480 and the UKRI Guarantee Funds.
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