Single-invariant nonlinear optics for a small electron recirculator
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 ( ) 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 . Stable transport is observed in PIC simulation for many turns at space charge tune spread 0.008. A maximum spread of (rms 0.015) is observed for modest octupole strength (peak ). A simplified model of the system explores beam sensitivity to steering and focusing errors. Results suggest that control of orbit distortion to within the insert region is essential. However, we see only weak dependence on deviations of lattice phase advance ( .) from the invariant-conserving condition.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Grant/Contract Number:
- SC0010301; AC05-00OR22725
- OSTI ID:
- 1504812
- Alternate ID(s):
- OSTI ID: 1649041
- Journal Information:
- Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Vol. 22 Journal Issue: 4; ISSN 2469-9888
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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