Image blur in high energy proton radiography

Abstract：

Proton radiography has provided a potential development direction for advanced hydrotesting, and its image blur is a crucial point that needs to be deeply studied. In this article, numerical simulation by using the Monte Carlo code Geant4 has been implemented to investigate the entire physics mechanism of high energy proton beam travelling through the object and beamline and arriving at the image plane. This article will mainly discuss the various factors which cause the image blur, including the chromatic aberration of the imaging beamline, the insufficient modulation of an incident particle's transverse displacement and angle deviation, the longitudinal length of an object, the influence of containment vessel and otherwise.