Performance of a low gain avalanche detector in a medical linac and characterisation of the beam profile
T. Isidori, P. McCavana, Brendan McClean, R. McNulty, N. Minafra, N. V. Raab, L. Rock, C. Royon
Abstract
Low gain avalanche detectors can measure charged particle fluences with high speed and spatial precision, and are a promising technology for radiation monitoring and dosimetry. A detector has been tested in a medical linac where single particles were observed with a time resolution of 50 ps. The integrated response is similar to a standard ionising chamber but with a spatial precision twenty times finer, and a temporal precision over 100 million times better, with the capability to measure the charge deposited by a single linac pulse. The unprecedented resolving power allows the structure of the ∼3 μs linac pulses to be viewed and the 350 ps sub-pulses in the train to be observed.