Space charge induced resonance excitation in high intensity rings

S. Cousineau; S. Y. Lee; J. A. Holmes; V. Danilov; A. Fedotov

doi:10.1103/PhysRevSTAB.6.034205

Space charge induced resonance excitation in high intensity rings

S. Cousineau, S. Y. Lee, J. A. Holmes, V. Danilov, A. Fedotov

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29 Scopus citations

Abstract

We present a particle core model study of the space charge effect on high intensity synchrotron beams, with specific emphasis on the Proton Storage Ring (PSR) at Los Alamos National Laboratory. Our particle core model formulation includes realistic lattice focusing and dispersion. We transport both matched and mismatched beams through real lattice structure and compare the results with those of an equivalent uniform-focusing approximation. The effects of lattice structure and finite momentum spread on the resonance behavior are specifically targeted. Stroboscopic maps of the mismatched envelope are constructed and show high-order resonances and stochastic effects that dominate at high mismatch or high intensity. We observe the evolution of the envelope phase-space structure during a high intensity PSR beam accumulation. Finally, we examine the envelope-particle parametric resonance condition and discuss the possibility for halo growth in synchrotron beams due to this mechanism.

Original language	English
Article number	034205
Pages (from-to)	112-125
Number of pages	14
Journal	Physical Review Special Topics - Accelerators and Beams
Volume	6
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevSTAB.6.034205
State	Published - 2003
Externally published	Yes

Funding

The authors would like to thank Robert Macek and the operations team at the LANSCE facility for providing us with experimental data and explanations of all parameters. We would also like to thank John Galambos for his initial motivation of this project. This work is supported by SNS through UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the U.S. DOE, and by Indiana University through grants from DOE, DE-FG02-92ER40747 and NSF, PHY-0140251. The SNS is ?>a partnership of six national laboratories: Argonne, Brookhaven, Jefferson, Lawrence Berkeley, Los Alamos, and Oak Ridge.

Funders	Funder number
National Science Foundation	PHY-0140251
U.S. Department of Energy	DE-FG02-92ER40747
Directorate for Mathematical and Physical Sciences	0140251
Indiana University
UT-Battelle	DE-AC05-00OR22725
SNS Nordic Forest Research

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10.1103/PhysRevSTAB.6.034205

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abstract = "We present a particle core model study of the space charge effect on high intensity synchrotron beams, with specific emphasis on the Proton Storage Ring (PSR) at Los Alamos National Laboratory. Our particle core model formulation includes realistic lattice focusing and dispersion. We transport both matched and mismatched beams through real lattice structure and compare the results with those of an equivalent uniform-focusing approximation. The effects of lattice structure and finite momentum spread on the resonance behavior are specifically targeted. Stroboscopic maps of the mismatched envelope are constructed and show high-order resonances and stochastic effects that dominate at high mismatch or high intensity. We observe the evolution of the envelope phase-space structure during a high intensity PSR beam accumulation. Finally, we examine the envelope-particle parametric resonance condition and discuss the possibility for halo growth in synchrotron beams due to this mechanism.",

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AU - Lee, S. Y.

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AU - Danilov, V.

AU - Fedotov, A.

PY - 2003

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AB - We present a particle core model study of the space charge effect on high intensity synchrotron beams, with specific emphasis on the Proton Storage Ring (PSR) at Los Alamos National Laboratory. Our particle core model formulation includes realistic lattice focusing and dispersion. We transport both matched and mismatched beams through real lattice structure and compare the results with those of an equivalent uniform-focusing approximation. The effects of lattice structure and finite momentum spread on the resonance behavior are specifically targeted. Stroboscopic maps of the mismatched envelope are constructed and show high-order resonances and stochastic effects that dominate at high mismatch or high intensity. We observe the evolution of the envelope phase-space structure during a high intensity PSR beam accumulation. Finally, we examine the envelope-particle parametric resonance condition and discuss the possibility for halo growth in synchrotron beams due to this mechanism.

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Space charge induced resonance excitation in high intensity rings

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