Long-Range Wakefields and Split-Tune Lattice at the SLC

At the SLC, a train consisting of one positron bunch fo l lowed by two electron bunches is accelerated in the linac, each separated by about 60 ns. Long-range transverse wakef ields from the leading bunch were found to cause up to a factor o f three increase in beam jitter for the trailing bunches. Incoming jitter is efficiently damped by BNS damping, but excitations in the middle of the linac from sources such as long-range wakefields can grow in amplitude. To measure the wake function, the time difference between the positron and electron bunches was changed, determining the frequency and strength of the dominant mode contributing to the dipole wakefield. By splitting the horizontal and vertical phase advance, or ‘tune’, of the magnetic lattice, it was possible t o decrease the resonant excitation from these wakefields and thereby reduce the jitter of the electron beam by a factor o f two. Contributed to XVIII International Linac Conference (LINAC96) Geneva, Switzerland 26-30 Aug 1996 * Work supported by Department of Energy contract DE–AC03–76SF00515. # Visiting scientist from KEK. Long-Range Wakefields and Split-Tune Lattice at the SLC F.-J. Decker, C.E. Adolphsen, R. Assmann, K. Bane, K. Kubo, M. Minty, P. Raimondi, T. Raubenheimer , R. Ruth, W.L. Spence SLAC, Stanford CA 94309, USA # Visiting scientist from KEK. * Work supported by DOE, contract DE-AC03-76SF00515. Abstract At the SLC, a train consisting of one positron bunch followed by two electron bunches is accelerated in the linac, each separated by about 60 ns. Long-range transverse wakefields from the leading bunch were found to cause up to a factor of three increase in beam jitter for the trailing bunches. Incoming jitter is efficiently damped by BNS damping, but excitations in the middle of the linac from sources such as long-range wakefields can grow in amplitude. To measure the wake function, the time difference between the positron and electron bunches was changed, determining the frequency and strength of the dominant mode contributing to the dipole wakefield. By splitting the horizontal and vertical phase advance, or ‘tune’, of the magnetic lattice, it was possible to decrease the resonant excitation from these wakefields and thereby reduce the jitter of the electron beam by a factor of two.