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- L. Badano, L. Badano
ELETTRA, Basovizza, Trieste
- K. Abbas, P. N. Gibson, U. Holzwarth
JRC, Ispra
- M. Caccia, C. Cappellini, V. Chmill, M. Jastrzab
Univ. Insubria and INFN Milano, Como
- O. Ferrando
Ente Ospedaliero Ospedali Galliera, Genova
- G. Molinari
CERN, Geneva
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A novel, non-disruptive beam profile monitor for low intensity light-ion beams has been constructed and tested. The system is designed for use in medical hadrontherapy centers where real-time monitoring of the beam intensity profile is of great importance for optimization of the accelerator operation, patient safety and dose delivery. The beam monitor is based on the detection of secondary electrons emitted from a submicron thick Al2O3/Al foil placed in the beam at an angle of 45 degrees. The present paper reports the latest results achieved with a customized monolithic active pixel array, which provides the beam intensity and position with a precision of better than 1 mm at a 10 kHz frame rate. The sensor chip is back-thinned to achieve the required sensitivity to short-range secondary electrons focused onto the sensor surface. The monitor performance has been tested with a patterned beam, produced with a multi-hole collimator, with the results indicating that the system performs according to its design specifications.
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