Preliminary tests of innovative thin silicon detectors for beam monitoring in particle therapy.

Hammad A.O., Cartiglia N., Attili A., Donetti M., Mazinani M., Fausti F., Ferrero M., Giordanengo S., Mandurrino M., Manganaro L., Mazza G., Monaco V., Sacchi R., Sola V., Staiano A., Vignati A., Cirio R.
  Venerdì 15/09   09:00 - 12:00   Aula A204   V - Biofisica e fisica medica
$Purpose$. For beam monitoring in particle-therapy, silicon detectors could overcome limitations of ionization chambers. In particular, silicon sensors with internal gain (Ultra Fast Silicon Detectors, UFSDs) provide high signal-to-noise ratio and fast collection times (1 ns in 50 $\mu$m thickness) allowing single particle counting. Beam energy can be measured with time-of-flight techniques. $Methods$. Two UFSD pads (1 mm$^2$) aligned along a proton beam are used to test UFSD counting and timing properties at therapeutic fluxes. $Results$. Measurements showed well separated signals with low pile-up. Number of particles, beam flux, and crossing time were determined obtaining a 50 ps time resolution for single crossing.