Confining continuous manipulations of accelerator beamline optics

TL;DR

This paper introduces an analytic method using homotopy to compute continuous correction functions for local beamline optics manipulations in accelerators, enabling adjustments during operation without disturbing the entire system.

Contribution

It presents a novel homotopy-based analytic approach for calculating continuous correction functions for beamline optics adjustments during operation.

Findings

Successfully applied to an algebraic example.

Implemented at the sFLASH experiment at DESY.

Enables local optics manipulation without affecting the whole accelerator.

Abstract

Altering the optics in one section of a linear accelerator beamline will in general cause an alteration of the optics in all downstream sections. In circular accelerators, changing the optical properties of any beamline element will have an impact on the optical functions throughout the whole machine. In many cases, however, it is desirable to change the optics in a certain beamline section without disturbing any other parts of the machine. Such a local optics manipulation can be achieved by adjusting a number of additional corrector magnets that restore the initial optics after the manipulated section. In that case, the effect of the manipulation is confined in the region between the manipulated and the correcting beamline elements. Introducing a manipulation continuously, while the machine is operating, therefore requires continuous correction functions to be applied to the correcting quadrupole magnets. In this paper we present an analytic approach to calculate such continuous correction functions for six quadrupole magnets by means of a homotopy method. Besides a detailed derivation of the method, we present its application to an algebraic example, as well as its implementation at the seeding experiment sFLASH at the free-electron laser FLASH located at DESY in Hamburg.