Transverse beam resonance in the superconducting linac of the Spallation Neutron Source

Y. Zhang; C. K. Allen; J. D. Galambos; J. Holmes; J. G. Wang

doi:10.1103/PhysRevSTAB.13.044401

Transverse beam resonance in the superconducting linac of the Spallation Neutron Source

Y. Zhang, C. K. Allen, J. D. Galambos, J. Holmes, J. G. Wang

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Abstract

A weak transverse resonance in the Spallation Neutron Source (SNS) superconducting linac is identified in computer simulations, and is believed to be one of the mechanisms behind measured beam losses. This weak resonance is induced by the nonlinear dodecapole component of the linac quadrupole magnets. It occurs when the linac focusing lattice has a transverse phase advance close to 60°. By reducing the phase advance to approximately 50° to avoid the resonance, we observe significant reduction in beam loss in the SNS superconducting linac. We present theory and computer simulation results supporting the notion that a suppression of the 60° resonance may contribute to reduction in the beam loss.

Original language	English
Article number	044401
Journal	Physical Review Special Topics - Accelerators and Beams
Volume	13
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevSTAB.13.044401
State	Published - Apr 19 2010

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abstract = "A weak transverse resonance in the Spallation Neutron Source (SNS) superconducting linac is identified in computer simulations, and is believed to be one of the mechanisms behind measured beam losses. This weak resonance is induced by the nonlinear dodecapole component of the linac quadrupole magnets. It occurs when the linac focusing lattice has a transverse phase advance close to 60°. By reducing the phase advance to approximately 50° to avoid the resonance, we observe significant reduction in beam loss in the SNS superconducting linac. We present theory and computer simulation results supporting the notion that a suppression of the 60° resonance may contribute to reduction in the beam loss.",

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AU - Zhang, Y.

AU - Allen, C. K.

AU - Galambos, J. D.

AU - Holmes, J.

AU - Wang, J. G.

PY - 2010/4/19

Y1 - 2010/4/19

N2 - A weak transverse resonance in the Spallation Neutron Source (SNS) superconducting linac is identified in computer simulations, and is believed to be one of the mechanisms behind measured beam losses. This weak resonance is induced by the nonlinear dodecapole component of the linac quadrupole magnets. It occurs when the linac focusing lattice has a transverse phase advance close to 60°. By reducing the phase advance to approximately 50° to avoid the resonance, we observe significant reduction in beam loss in the SNS superconducting linac. We present theory and computer simulation results supporting the notion that a suppression of the 60° resonance may contribute to reduction in the beam loss.

AB - A weak transverse resonance in the Spallation Neutron Source (SNS) superconducting linac is identified in computer simulations, and is believed to be one of the mechanisms behind measured beam losses. This weak resonance is induced by the nonlinear dodecapole component of the linac quadrupole magnets. It occurs when the linac focusing lattice has a transverse phase advance close to 60°. By reducing the phase advance to approximately 50° to avoid the resonance, we observe significant reduction in beam loss in the SNS superconducting linac. We present theory and computer simulation results supporting the notion that a suppression of the 60° resonance may contribute to reduction in the beam loss.

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JO - Physical Review Special Topics - Accelerators and Beams

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ER -

Transverse beam resonance in the superconducting linac of the Spallation Neutron Source

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