Speaker
Description
To monitor the beam energy and transverse distribution of the 50 MeV proton cyclotron facility in Huairou, a fixed-spacing strip ionization chamber is planned for development. Based on factors affecting the measurement accuracy of flat-panel ionization chambers, Monte Carlo simulation software such as Geant4 and Srim was employed to calculate parameters including energy deposition and particle transmission efficiency within the flat-panel ionization chamber under various influencing factors. Through analysis, the final ionization chamber structure, material composition, and working gas selection were determined. Simulation calculations confirmed the final strip ionization chamber design: a 50μm-thick Mylar film with double-sided aluminum coating serves as the high-voltage electrode, while a 150μm-thick flexible PCB functions as the collecting electrode. The spacing between the high-voltage electrode and collecting electrode is 3mm, with air as the working gas. Simulations demonstrated the strip ionization chamber exhibits excellent energy response, achieving beam loss ≤0.0258% and an average energy loss of 1.08 MeV. This provides a reliable design basis for subsequent hardware fabrication and beam diagnostics algorithms.
