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The experimental program at the University of Maryland Electron Ring (UMER) will explore the performance of a strong octupole lattice at a range of operating points. This reduces intensity-driven beam loss while quasi-integrability ensures contained orbits. Large amplitude-dependent tune spreads, driven by strong nonlinear magnet inserts, lead to decoherence from incoherent tune resonances. Nonlinear quasi-integrable optics is a promising development on the horizon of high-intensity ring design.

K.J. Ruisard, H. Baumgartner, B. Beaudoin, I. Haber, T.W. Koeth, D.B. Matthewįunding: Work and travel supported by NSF GRFP, NSF Accelerator Science Program, DOE-HEP and UMD Graduate School ICSSA award.

Finally, efforts towards possible measurements with the CERN Super Proton Synchrotron (SPS) are discussed aiming at studying the underlying stabilising mechanisms experimentally.Įarly Tests and Simulation of Quasi-Integrable Octupole Lattices at the University of Maryland Electron Ring Furthermore, potential performance limitations such as the excitation of synchro-betatron resonances are pointed out. As a specific example, the performance of an rf quadrupole system in presence of magnetic octupoles is demonstrated for HL-LHC.

By means of the PyHEADTAIL macroparticle tracking code, the stabilising mechanism introduced by an rf quadrupole is studied and discussed. In addition to octupole magnets installed for the purpose of Landau damping, we propose to use radio frequency (rf) quadrupole structures to considerably enhance the aforementioned stabilising effect.

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The beams required for the high luminosity upgrade of the Large Hadron Collider (HL-LHC) at CERN call for efficient mechanisms to suppress transverse collective instabilities. M. Schenk, A. Grudiev, K.S.B. Li, K. Papke.Use of RF Quadrupole Structures to Enhance Stability in Accelerator Rings The method developed in this study is mainly applicable to systems with slowly varying parameters, i.e slow acceleration. Using several classes of particle distribution functions, we investigate the effects of space charge forces on the non-linear beam dynamics of FFAG and provide stability diagrams for an FFAG-like lattice. This paper shows that, to carry out parametric studies of these effects in FFAG, the average field index of the focusing and defocusing magnets are the natural parametrization. Understanding space charge effects in FFAG is crucial in order to assess their potential for high power applications. Furthermore, we estimate the lifetime of partially stripped heavy-ions due to charge exchange process in the lens.įunding: Work supported by Brookhaven Science Associates, LLC under Contract No. We also study the effect of electron lenses on the coherent (collective) and incoherent (single-particle) stopbands. We anticipate beta beating may arise due to the singular localized focusing error, and explore the possibility of adding additional lenses to reduce this error. In this paper, we study the effect of using the existing electron cooler at the SIS18 as a space charge compensation device.

A co-propagating, low energy electron lens can compensate for this tune shift by applying opposing space-charge fields in the ion beam.

Intensity is limited in part by the space-charge-induced incoherent tune shift in bunched beams. Using an Electron Cooler for Space Charge Compensation in the GSI Synchrotron SIS18įunding: Work is supported by BMBF contract FKZ:05P15RDRBAįor the future operation of the SIS18 as a booster synchrotron for the FAIR SIS100, space charge and beam lifetime are expected to be the main intensity limitations. HB2016 - Table of Session: THA7 (Working Group A - Session 7) THA7 - Working Group A - Session 7 (07-Jul-16 16:00-18:00)Ĭhair: W. Fischer, BNL, Upton, Long Island, New York, USA Paper

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