Autoranging readout electronics for the monitoring system of the TOP-IMPLART proton therapy beam

A new proton beam monitoring system and its dedicated electronics is under development for the TOP-IMPLART proton therapy facility, based on 10 to 100 Hz pulsed proton LINAC, with maximum kinetic energy of 230 MeV. The system consists of segmented ionization chambers that will measure the beam intensity profile, position and direction to monitor the fully active 3+1D beam. The chamber readout electronics, based on multiplexed multichannel sample and hold, dynamically adapts the integration capacitance on each of its input trans-impedance amplifier to the incoming charge, reaching a rather challenging dynamic range larger than 10 4 and relative sensitivity better than 3%.