Long path-length experimental studies of longitudinal phenomena in intense beams

Beaudoin, B.; Haber, I.; Kishek, R. A.; Bernal, S.; Koeth, T.

doi:10.1063/1.4943522

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…The low beam rigidity allows for the use of low-cost, aircore printed circuit board (PCB) magnets; we apply the same approach to create our nonlinear focusing elements. The lattice also includes induction cells for longitudinal focusing, which supports multiple confinement conditions such as RF sine (recently added) and RF barrier bucket in addition to unconfined/coasting bunches [12,13].…”

Section: Umer Programmentioning

confidence: 99%

Single-invariant nonlinear optics for a small electron recirculator

Ruisard

Komkov

Beaudoin

et al. 2019

Phys. Rev. Accel. Beams

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This paper describes the design and simulation of a proof-of-concept quasi-integrable octupole lattice at the University of Maryland Electron Ring (UMER). This experiment tests the feasibility of nonlinear integrable optics, a novel technique that is expected to mitigate resonant beam loss and enable low-loss high-intensity beam transport in rings. Integrable lattices with large amplitudedependent tune spreads, created by nonlinear focusing elements, are proposed to damp beam response to resonant driving perturbations while maintaining large dynamic aperture [Danilov and Nagaitsev, PRSTAB, 2010]. At UMER, a lattice with a single octupole insert is designed to test the predictions of this theory. The planned experiment employs a low-current high-emittance beam with low space charge tune shift (∼ 0.005) to probe the dynamics of a lattice with large externally-induced tune spread. Design studies show that a lattice composed of a 25-cm octupole insert and existing UMER optics can induce a tune spread of ∼ 0.13. Stable transport is observed in PIC simulation for many turns at space charge tune spread 0.008. A maximum spread of ∆ν = 0.11 (RMS 0.015) is observed for modest octupole strength (peak 50 T /m 3 ). A simplified model of the system explores beam sensitivity to steering and focusing errors. Results suggest that control of orbit distortion to < 0.2 mm within the insert region is essential. However, we see only weak dependence on deviations of lattice phase advance (≤ 0.1 rad.) from the invariant-conserving condition.

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Section: Umer Programmentioning

confidence: 99%