Monte Carlo modelling of positron transport in real world applications

18th International Summer School on Vacuum, Electron and Ion Technologies

Marjanovic´, S.^1 ; Bankovic´, A.^1 ; Uvakov, M.^1 ; Petrovic´, Z Lj^1

Institute of Physics, University of Belgrade, 118 Pregrevica, 11080 Belgrade, Serbia^1

关键词: Energy particles;    Human tissues;    Measurements of;    Monte Carlo modelling;    Monte carlo simulation technique;    Monte Carlo techniques;    Particle densities;    Rotating walls;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/514/1/012046/pdf
DOI  :  10.1088/1742-6596/514/1/012046

来源: IOP

【 摘 要 】

Due to the unstable nature of positrons and their short lifetime, it is difficult to obtain high positron particle densities. This is why the Monte Carlo simulation technique, as a swarm method, is very suitable for modelling most of the current positron applications involving gaseous and liquid media. The ongoing work on the measurements of cross-sections for positron interactions with atoms and molecules and swarm calculations for positrons in gasses led to the establishment of good cross-section sets for positron interaction with gasses commonly used in real-world applications. Using the standard Monte Carlo technique and codes that can follow both low- (down to thermal energy) and high- (up to keV) energy particles, we are able to model different systems directly applicable to existing experimental setups and techniques. This paper reviews the results on modelling Surko-type positron buffer gas traps, application of the rotating wall technique and simulation of positron tracks in water vapor as a substitute for human tissue, and pinpoints the challenges in and advantages of applying Monte Carlo simulations to these systems.