SITH: a 16-channel ASIC for SiPMs Readout in Hadrontherapy Applications

In hadrontherapy treatments, charged particles deposit a high and localized dose in the tumor volume. Detection of secondary radiations like Prompt Gammas (PG) can be used to monitor the dose profile falloff position, increasing the precision of this technique. In this work we present the design of SITH: an ASIC developed for the readout of Silicon Photomultipliers (SiPMs) coupled with scintillators used in this application. PG characteristics set specific requirements for the front-end electronics such as the capability to process up to 5nC input charge (energy up to 8MeV), timing resolution better than 1ns (e.g. for scattering correction), multiple triggering logic and potential for neutron/photon discrimination. We report an overview of the principal electronic stages and simulation results.