NUCLEAR FRAGMENTATION CROSS SECTIONS MEASUREMENTS FOR HADRONTHERAPY: IMPLEMENTATION AND OPTIMIZATION OF A BEAM MONITORING SYSTEM

YUNSHENG DONG
2021
The FOOT project is a nuclear physics experiment that aims to measure the differential cross sections (d2σ/dΩ·dE) of the nuclear interactions involved in particle therapy and space radioprotection. The final experimental data will be adopted as benchmark for the MC simulation tools, to improve the current particle therapy treatment planning systems and to develop a new shielding design suitable for the future space missions. The FOOT project consists of two different experimental setups and in
more » ... oth of them a drift chamber is adopted as Beam Monitor to measure the projectile direction and position, to count the total number of delivered particles and to reject the pre-target fragmentation events. In this Ph. D. project, which has contributed to the construction and start of the FOOT experiment, the drift chamber has been finalized, tested, calibrated and operated in the experiment. A multi-track reconstruction algorithm has been developed taking advantages of the Legendre transformation properties combined with a χ2 minimization algorithm. The software has been tested and optimized both on experimental and on MC simulated data and it has been included within the FOOT global reconstruction code. The detector has been used in different tests and data takings. In particular, an extensive calibration and performance assessment has been conducted with protons at 228 and 80 MeV. In this occasion, the overall Beam Monitor efficiency, spatial resolution and active area have been measured. In addition, the space-time relations of the drift chamber have been measured and the results have been adopted as benchmark for a self calibration method developed to estimate the space-time relations using only the Beam Monitor hits and tracks. The detector has been successfully operated in the FOOT data takings performed with both the experimental setups. In particular, in the framework of the emulsion spectrometer measurements, the Beam Monitor has been employed to measure the profile of the irradiation pattern and to count the total [...]
doi:10.13130/dong-yunsheng_phd2021-03-08 fatcat:d5mmsr7hnfderljtokpvkg6ycu