The Maryland electron ring for investigating space-charge dominated beams in a circular fodo system

Abstract

The University of Maryland Electron Ring (UMER), currently under construction, has been designed to study the physics of space-charge dominated beams at extremely large values of the betatron tune shift which exceed those of existing strong-focusing synchrotrons and rings by more than an order of magnitude. In this paper, the unique design features of this research facility, the new beam physics to be investigated, and recent experimental results in the injector prototype as well as simulation studies will be reviewed.

Investigations of the Dynamics of Space Charged Dominated Beams

“…1. We propose to explore the efficacy of the of the template model to address simulation problems such as beam dynamics simulations over many turns in rings by first testing its agreement with the predictions of other, more general codes.…”

The problem of dispersion matching in space charge dominated beams

“…In this section we report the simulations done with the PIC code WARP to test various matching schemes worked out using the generalized rms envelope equations (2). The calculations presented here refer to a hard edge model of the Maryland E-Ring [7]. The E-Ring is designed for circulation of a 10 KeV electron beam with a current in the proximity of 100 mA.…”

“…Understanding the combined effect of space charge and an energy spread in a circular lattice and more specifically, inclusion of space charge forces in the calculation of the dispersion function has been the subject of a number of papers over the last few years [1 − 6] The surge of interest has been motivated by the need of high intensity and quality beams in applications like the Spallation Neutron Source, the drivers for Heavy Ion Fusion or in studies of beam physics as in the Maryland Electron Ring [7]. In all these cases meeting optimal matching conditions (including the dispersion function) will be critical for a proper machine operation.…”

Design, simulation and test of pulsed Panofsky quadrupoles

“…An electron ring, UMER, is under development at the University of Maryland for the purpose of studying space charge dominated beams in a circular FODO lattice [1,2]. Two pulsed Panofsky quadrupoles shown in Figure 1 with rectangular aperture and fast rise time are proposed in the injection area [3].…”

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AbstractTwo Panofsky quadrupoles with rectangular aperture and fast rise time are proposed for the injection area in the University of Maryland electron ring project (UMER) [1,2,3]. The theoretical current distribution needed on the surface of a rectangular aperture to produce a quadrupole field is derived [4].

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