Fast code CASCIE (Code for Accelerating Structures -Coupled Integral Equations). Test Results

TL;DR

This paper presents test results of the fast CASCIE code, an analytical-numerical tool for studying inhomogeneous waveguides, revealing a constant phase shift issue affecting resonator dimension determination in accelerating structures.

Contribution

The paper introduces the application of the fast CASCIE code to optimize resonator chains and identifies a previously overlooked phase shift problem in structure design.

Findings

Discovered a constant phase shift issue in resonator dimension calculations.

Validated the fast CASCIE code for inhomogeneous waveguide analysis.

Highlighted implications for short accelerating structure development.

Abstract

Results of testing the fast CASCIE (Code for Accelerating Structures - Coupled Integral Equations) code developed as an analytical-numerical tool for studying the properties of inhomogeneous structured waveguides are presented. We have used this code to numerically tune the resonator chain, which is very similar to the classic 3m SLAC accelerating structure. During testing, we discovered a problem that, in our opinion, was overlooked in the development of the accelerating sections, namely the appearance of a constant phase shift when determining the dimensions of the resonator radii from the characteristics of homogeneous structures. This issue is particularly relevant in the development of short accelerating structures.