Emittance and Phase Space Tomography for the Fermilab Linac

TL;DR

This paper presents a method for measuring the beam emittance and phase space distribution in the Fermilab Linac using tomography techniques, involving phase space rotation and de-convolution of profile data.

Contribution

It introduces a novel tomography-based diagnostic approach for non-elliptical phase space characterization in a linear accelerator.

Findings

Successful preliminary measurements of beam properties

Effective phase space reconstruction using tomography

Enhanced understanding of beam dynamics in the Fermilab Linac

Abstract

The Fermilab Linac delivers a variable intensity, 400-MeV beam to the The MuCool Test Area experimental hall via a beam line specifically designed to facilitate measurements of the Linac beam emittance and properties. A 10 m, dispersion-free and magnet-free straight utilizes an upstream quadrupole focusing triplet in combination with the necessary in-straight beam diagnostics to fully characterize the transverse beam properties. Since the Linac does not produce a strictly elliptical phase space, tomography must be performed on the profile data to retrieve the actual particle distribution in phase space. This is achieved by rotating the phase space distribution using different waist focusing conditions of the upstream triplet and performing a de-convolution of the profile data. Preliminary measurements using this diagnostic section are reported here.