Observation of helium flow induced beam orbit oscillations at RHIC

C. Montag,R. Bonati,J.M. Brennan,J. Butler,P. Cameron,G. Ganetis,P. He,W. Hirzel,L.X. Jia,P. Koello,W. Louie, G. McIntyre,A. Nicoletti,J. Rank,T. Roser,T. Satogata,J. Schmalzle,A. Sidi-Yekhlef,J. Sondericker,T. Tallerico

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2006）

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摘要

Horizontal beam orbit jitter at frequencies around 10 Hz has been observed at RHIC for several years. The distinct frequencies of this jitter have been found at superconducting low-beta quadrupole triplet magnets around the ring, where they coincide with mechanical vibration modes of the cold masses. Recently, we have identified liquid helium flow as the driving force of these oscillations.

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