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Experimental results with a Compton telescope prototype: MACACO II

AuthorsBorja-LLoret, P.; Barrientos, L.; Barrio Toala, J. ; Bernabéu, José ; Dendooven, P.; García López, J. ; Jiménez-Ramos, M. C. ; Lacasta Llácer, Carlos ; Muñoz, Enrique; Oliver Guillén, José Francisco ; Ozoemelan, I.; Ros García, Ana ; Roser, J.; Senra, C.; Solaz, Carles; Llosa, G.
Issue Date1-Jul-2019
Citation17th Annual Meeting and Training (2019)
AbstractPurpose Real-time monitoring is still a challenge in hadrontherapy. With this aim, a Compton telescope prototype (MACACO) has been developed by the IRIS group at IFIC-Valencia within the European project ENVISION. The second prototype MACACO II is an upgrade developed with the purpose of enhancing its performance. Material and Methods MACACO II consists of three layers of LaBr3 monolithic crystals coupled to silicon photomultiplier (SiPM) arrays. New crystals have been coupled to 8x8 pixel SiPM arrays from Hamamatsu Photonics (S13361-3050AE-08). Moreover, an improved image reconstruction code including an accurate model for the sensitivity matrix has been implemented. The telescope has been characterized in the laboratory with 22Na and 152Eu sources and tested in two accelerator centres. The first test took place at CNA (Sevilla) with a 18 MeV proton beam impinging on a graphite target in order to produce 4.4 MeV gamma rays. A second test was held in KVI-CART (Groningen) with a 150 MeV proton beam hitting a PMMA target. Monte Carlo simulations have been carried out with GATE V 7.0. Results In the laboratory, the energy resolution has been improved and an angular resolution of 4.6° has been achieved, which together with the improved reconstruction code, have led to a better image quality. The efficiency measured with two planes in coincidence at 1275 keV is 1.0x10-3. Monte Carlo simulations result in a good correlation with the experimental parameters. Regarding the In-beam experiments, two target positions separated by 5 mm have been reconstructed from the CNA test-beam. Furthermore, KVI-CART test-beam results show that Bragg distribution correlates to the PMMA position. Conclusions MACACO II has shown a better performance than the previous prototype. The testbeam results have demonstrated the ability to reconstruct different positions. Further improvements are ongoing in order to achieve the required performance for the application.
DescriptionTrabajo presentado en el 17th Annual Meeting and Training, celebrado en Caen (Francia) del 1 al 3 de julio de 2019
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