Linear Lattice and Trajectory Reconstruction and Correction at FAST Linear Accelerator

TL;DR

This paper discusses the successful commissioning of the low energy section of the FAST linear accelerator, focusing on beam-based methods for lattice and trajectory correction using profile monitors and response analysis.

Contribution

It introduces a beam-based correction algorithm utilizing beam shape and response data for lattice and trajectory optimization in a superconducting RF linac.

Findings

Effective lattice correction achieved

Trajectory alignment improved

Experimental validation of correction methods

Abstract

The low energy part of the FAST linear accelerator based on 1.3 GHz superconducting RF cavities was successfully commissioned. During commissioning, beam based model dependent methods were used to correct linear lattice and trajectory. Lattice correction algorithm is based on analysis of beam shape from profile monitors and trajectory responses to dipole correctors. Trajectory responses to field gradient variations in quadrupoles and phase variations in superconducting RF cavities were used to correct bunch offsets in quadrupoles and accelerating cavities relative to their magnetic axes. Details of used methods and experimental results are presented.