How to (better) model beam transport

Accurate calculations of the complex electrostatic fields surrounding a charged mesh are pivotal to understand their effects on particle motion. Analytical solutions have been found utilising several assumptions; however, they limit the ability to be fully confident in the fields generated around a physical wire mesh and with a multi-mesh system it becomes even more complicated. To this end finite element solvers were used to accurately model a mesh and calculate highly precise potentials around the structure using the exact geometry of a physical mesh.

Simulation tools often used for these systems are black boxes as the user has little access or understanding into what codes are doing. For this reason an easy-to-use Matlab-Simulink code was developed which uses field values calculated by the finite element method to be able to fully simulate particles travelling through mesh based systems. This new code allows any initial distribution of particles to be simulated and as such gives the user greater freedom to understand particle dynamics using a mesh of any dimensions and with any potential applied. The Simulink framework also allows changes to be made to the model to fit specific requirements with the option to use traditional script based algorithms. This code has been made freely available so that it may be used by anyone who wishes to use it to understand their mesh systems in greater detail.