Comparison between measurements, simulations, and theoretical predictions of the extraction kicker transverse dipole instability in the Spallation Neutron Source

J. A. Holmes, S. Cousineau, V. Danilov, L. Jain

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Abstract

Occasionally, it is possible to bring together experiment, theory, and simulation in detail. Such an occasion occurred during a high intensity beam physics study in the Spallation Neutron Source (SNS). A transverse dipole instability in the vertical direction has been observed in the accumulator ring for a coasting beam that was stored for 10000 turns. This instability was observed at a beam intensity of about 12 μC and was characterized by a frequency spectrum peaking at about 6 MHz. The probable cause of the instability is the impedance of the ring extraction kickers. We carry out here a detailed benchmark of the observed instability, uniting an analysis of the experimental data, a precise ORBIT code tracking simulation, and a theoretical estimate of the observed beam instability.

Original languageEnglish
Article number074401
JournalPhysical Review Special Topics - Accelerators and Beams
Volume14
Issue number7
DOIs
StatePublished - Jul 27 2011

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