Transfer Matrix for combined RF and Solenoid Fields

TL;DR

This paper introduces a novel transfer matrix method for combined RF and solenoid fields that enables accurate and efficient particle transport simulations without complex derivatives or eigenfunction calculations.

Contribution

The method constructs the transfer matrix directly from 1D field maps, accurately modeling low energy particle dynamics in RF and electrostatic gun environments.

Findings

Excellent agreement with direct integration methods

Efficient computation without derivatives or eigenfunction expansions

Applicable to low energy particle transport simulations

Abstract

We present a new method for computing the transverse transfer matrix through superimposed axisymmetric RF and solenoid field maps. The algorithm constructs the transfer matrix directly from one dimensional RF and solenoid field maps without computing numerical derivatives or eigenfunction expansions of the field map data. In addition, this method accurately describes the dynamics of low energy particles starting from a solenoid immersed cathode, allowing the method to be used to simulate transport through both RF and electrostatic guns. Comparison of particle tracking with the transfer matrix and direct integration of the equations of motion through several field set-ups shows excellent agreement between the two methods.