Preliminary results of 200 MeV bunching experiments

Danby, G.; Gill, E.; Keane, J.; Maschke, A.

doi:10.2172/7107575

Cited by 5 publications

(3 citation statements)

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“…Some pioneering experiments have been performed at the AGS [28] which gave credence to this assertion. Up until these experiments with UMER, however, there has been no systematic experimental study, likely due to cost of modifying an existing high-energy ring for the purpose.…”

Section: Multi-turn Resultsmentioning

confidence: 85%

The University of Maryland Electron Ring (UMER) enters a new regime of high-tune-shift rings

Kishek

Bai

Beaudoin

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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Beams with a high phase space density are useful for many modern applications such as free electron lasers, pulsed neutron sources, high-energy-density physics, and high-luminosity colliders. Production of such beams requires understanding the complex space charge dynamics at the low-energy end of the accelerator. The University of Maryland Electron Ring (UMER) has been designed and built with the purpose of investigating space charge effects using scaled low-energy electron experiments. We have recently circulated the highestspace-charge beam in a ring to date, achieving a breakthrough both in the number of turns and in the amount of current propagated. We have propagated a beam with an integer tune shift for over 100 turns, and other, even higher-current beams, for 5-50 turns albeit with some beam loss. One beam had a tune shift at injection of 5.0, which is several factors higher than anything propagated in the past. We report here as well on other interesting aspects of the UMER work.

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Section: Multi-turn Resultsmentioning

confidence: 85%

The University of Maryland Electron Ring (UMER) enters a new regime of high-tune-shift rings

Kishek

Bai

Beaudoin

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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“…As an example, a tune shift of 1.9, the largest measured in a circular machine, was achieved by Maschke in a special experiment at the AGS at Brookhaven National Laboratory in 1977 [3]. The tune shift described so far is called "incoherent", i.e., related to single-particle motion as opposed to motion of the beam as a whole.…”

Section: New Developments In Space-charge Beam Physics Research At Thmentioning

confidence: 99%

New Developments in Space-Charge Beam Physics Research at the University of Maryland Electron Ring (UMER)

Bernal¹,

Bai²,

Beaudoin³

et al. 2006

AIP Conference Proceedings

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The University of Maryland electron ring (UMER) is a low-energy, high current recirculator for beam physics research with relevance to any applications that rely on intense beams of high quality. We review the space-charge physics issues, both in transverse and longitudinal beam dynamics, which are currently being addressed with UMER: emittance growth and halo formation, strongly asymmetric beams, Montague resonances, equipartitioning, bunch capture and shaping, etc. Furthermore, we report on recent developments in experiments, simulations, and improved diagnostics for space-charge dominated beams.

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“…1. The largest tune shift of ∆ν = 1.9 was achieved in a rapid-bunching experiment at the AGS (where ν 0 = 8.84) by the late A. Maschke and collaborators in 1977 [2]. The corresponding tune depression of ν/ν 0 = 0.79 at χ = 0.376 is also indicated in Fig.…”

Section: Beam Physicsmentioning

confidence: 74%

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

Reiser

O’Shea

Kishek

et al.

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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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.

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Preliminary results of 200 MeV bunching experiments

Cited by 5 publications

References 0 publications

The University of Maryland Electron Ring (UMER) enters a new regime of high-tune-shift rings

The University of Maryland Electron Ring (UMER) enters a new regime of high-tune-shift rings

New Developments in Space-Charge Beam Physics Research at the University of Maryland Electron Ring (UMER)

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

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