Accelerator Design for the CHESS-U Upgrade

TL;DR

This paper details the design and implementation of the CHESS-U upgrade to the Cornell Electron Storage Ring, enhancing x-ray flux for users through a novel lattice configuration and specific modifications.

Contribution

It presents a unique CESR lattice design for the CHESS-U upgrade, addressing specific constraints and detailing the implementation process.

Findings

Successful upgrade of CESR for CHESS-U with increased flux

Implementation of six double-bend achromats (DBAs) in the lattice

Adaptation to unique constraints of the CESR modifications

Abstract

During the summer and fall of 2018 the Cornell High Energy Synchrotron Source (CHESS) is undergoing an upgrade to increase high-energy flux for x-ray users. The upgrade requires replacing one-sixth of the Cornell Electron Storage Ring (CESR), inverting the polarity of half of the CHESS beam lines, and switching to single-beam on-axis operation. The new sextant is comprised of six double-bend achromats (DBAs) with combined-function dipole-quadrupoles. Although the DBA design is widely utilized and well understood, the constraints for the CESR modifications make the CHESS-U lattice unique. This paper describes the design objectives, constraints, and implementation for the CESR accelerator upgrade for CHESS-U.