The design of a simulated in‐line side‐coupled 6 MV linear accelerator waveguide

Abstract

A full 3D design for an in-line side-coupled 6 MV linear accelerator that emulates a common commercial waveguide has been given. The effect of the side coupling on the dose distribution has been shown to create a slight asymmetry, but overall does not affect the clinical applicability of the linac. The 3D in-line side-coupled linac model further provides a tool for the investigation of linac performance within an external magnetic field, which exists in an integrated linac-MR system.

Magnetic shielding investigation for a 6 MV in-line linac within the parallel configuration of a linac-MR system

“…The linac simulation, which was validated for 0 T 20 and used previously for the longitudinal magnetic field studies, 6 was divided into two parts: the electron gun simulation 20 and the waveguide simulation. 24 The electron gun simulation was accomplished through OPERA-3d/SCALA from Cobham Technical Services (Kidlington, UK), which will be referred to as SCALA in this document. SCALA uses FEM to solve for the electrostatic fields within the gun and uses these fields to calculate particle space-charge forces and particle trajectories in 3D based on the Child's law thermionic emission model.…”

Design and optimization of a 2 MeV X-band side-coupled accelerating structure

“…A race-track-shaped coupler has been designed for the structure to input RF power [15]. The middle of the structure is chosen for the fields along the axis being flat.…”

FEM design and simulation of a short, 10 MV, S‐band Linac with Monte Carlo dose simulations

“…In our previous work 16,18 to emulate the Varian 600C, we had accomplished this by adjusting the nose cone length (L NC in Fig. 1) to increase or decrease the cavity capacitance in order to adjust the frequency.…”

“…2) 18 and therefore need to be precisely optimized to improve the electron (and photon) beam properties. These fields were controlled by offsetting the first coupling cavity (CC1 in Fig.…”