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TY - CONF AU - Psoroulas, S. AU - Fernandez Carmona, P. AU - Meer, D. AU - Weber, D.C. ED - Conradie, Lowry ED - De Villiers, John Garrett ED - Schaa, Volker RW TI - On-Line Dynamic Beam Intensity Control in a Proton Therapy Cyclotron J2 - Proc. of Cyclotrons2019, Cape Town, South Africa, 23-27 September 2019 CY - Cape Town, South Africa T2 - International Conference on Cyclotrons and their Applications T3 - 22 LA - english AB - Modern proton therapy facilities use the pencil beam scanning (PBS) technique for the treatment of tumours: the beam is scanned through the tumour volume sequentially, i.e. stopping the beam at each position in the tumour for the amount of time necessary to deliver the prescribed dose for that position, and then moving to the next position (dose-driven delivery). This technique is robust against fluctuations in the beam current. Modern cyclotrons however offer very stable beam currents, and allow regulating the beam intensity online to match the requested beam intensity profile as a function of time (’time-driven’ delivery). To realise time-driven delivery at the COMET cyclotron at PSI*, we have designed a beam intensity controller** which is able to partially compensate for the non-linearity and the delay introduced by the physical limitations of the beam line elements and its drivers; this is particularly important when trying to achieve a very fast modulation of the beam, as required by the clinical plans. Experimental results have shown good performance for most current clinical scenarios, though we are investigating more advanced solutions for higher dose rates scenarios. PB - JACoW Publishing CP - Geneva, Switzerland SP - 148 EP - 151 KW - controls KW - cyclotron KW - proton KW - power-supply KW - operation DA - 2020/06 PY - 2020 SN - 978-3-95450-205-9 DO - doi:10.18429/JACoW-Cyclotrons2019-TUB04 UR - http://jacow.org/cyclotrons2019/papers/tub04.pdf ER -