A Modular Path Length Corrector for Recirculating Linacs

TL;DR

This paper introduces a modular magnetic system for recirculating linacs that allows large, adjustable path length differences without affecting longitudinal dispersion, using combined magnetic and focusing chicanes.

Contribution

It presents a novel, modular magnetic system capable of large, continuously-variable path length adjustments with minimal nonlinear effects, adaptable to different dispersion conditions.

Findings

System can introduce large, adjustable path length differences.

Nonlinear effects in the system are relatively small.

System can be configured to be isochronous or have specified dispersion.

Abstract

We present a novel modular magnetic system that can introduce a large and continuously-variable path length difference without simultaneous variation of the longitudinal dispersion. This is achieved by using a combination of an electrically-adjustable magnetic chicane and a mechanically-adjustable focus- ing chicane. We describe how such a system may be made either isochronous or with a given longitudinal dispersion, and show that the nonlinear terms in such a system are relatively small.