Author/Authors :
Montag، نويسنده , , C. and Bonati، نويسنده , , R. and Brennan، نويسنده , , J.M. and Butler، نويسنده , , J. and Cameron، نويسنده , , P. and Ganetis، نويسنده , , G. and He، نويسنده , , P. and Hirzel، نويسنده , , W. and Jia، نويسنده , , L.X. and Koello، نويسنده , , P. and Louie، نويسنده , , Marc W. and McIntyre، نويسنده , , G. and Nicoletti، نويسنده , , A. and Rank، نويسنده , , J. and Roser، نويسنده , , T. and Satogata، نويسنده , , T. and Schmalzle، نويسنده , , J، نويسنده ,
Abstract :
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.
