期刊
PHYSICAL REVIEW ACCELERATORS AND BEAMS
卷 22, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevAccelBeams.22.041601
关键词
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资金
- DOE-HEP [DESC0010301]
- NSF [PHY1414681]
- NSF GRFP [DGE1322106]
- U.S. Department of Energy [DE-AC0500OR22725]
This paper describes the design and simulation of a proof-of-concept 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 amplitude-dependent tune spreads, created by nonlinear focusing elements, are proposed to damp beam response to resonant driving perturbations while maintaining large dynamic aperture. 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 (similar to 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 similar to 0.13. Stable transport is observed in PIC simulation for many turns at space charge tune spread 0.008. A maximum spread of Delta nu = 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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