Low Space-Charge Intensity Beams in UMER via Collimation and Solenoid Focusing

TL;DR

This paper explores methods to operate the UMER with low space-charge intensity beams using collimation and solenoid focusing, aiming to model space-charge effects in larger accelerators and study nonlinear dynamics.

Contribution

It introduces a simple technique involving collimation and solenoid focusing to vary the space-charge intensity in UMER, enabling new experimental regimes.

Findings

Demonstrated reduction of space-charge effects in UMER

Compared space-charge parameters across different accelerators

Proposed a practical method for low space-charge beam operation

Abstract

The University of Maryland Electron Ring (UMER) has operated traditionally in the regime of strong space-charge dominated beam transport, but small-current beams are desirable to significantly reduce the direct (incoherent) space-charge tune shift as well as the tune depression. This regime is of interest to model space-charge effects in large proton and ion rings similar to those used in nuclear physics and spallation neutron sources, and also for nonlinear dynamics studies of lattices inspired on the Integrable Optics Test Accelerator (IOTA). We review the definition of space-charge intensity, show a comparison of space-charge parameters in UMER and other machines, and discuss a simple method involving double collimation and solenoid focusing for varying the space-charge intensity of the beam injected into UMER.