Higher order beam jitter in the SLC linac

Conference · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:621784

Decker, F -J; Adolphsen, C E; Podobedov, B; Raimondi, P

The pulse-to-pulse behavior of the beams in the SLC linac is dominated by wakefields which can amplify any other sources of jitter. A strong focusing lattice combined with BNS damping controls the amplitude of oscillations which otherwise would grow exponentially. Measurements of oscillation amplitude along the linac show beam motion that is up to six times larger than that expected from injection jitter. A search for possible sources of jitter within the linac uncovered some problems such as structure jitter at 8 to 12 Hz, pump vibrations at 59 Hz and 1 Hz aliasing by the feedback systems. These account for only a small fraction of the observed jitter which is dominantly white noise. No source has yet been fully identified but possible candidates are dark current in the linac structures (not confirmed by experiment) or subtle correlations in injection jitter. An example would be a correlated x-z jitter with no net offset visible on the beam position monitors at injection. Such a correlation would cause jitter growth along the linac as wakefields from the head of the bunch deflect the core and tail of the bunch. Estimates of the magnitude of this effect and some possible sources are discussed in this paper.

• Research Organization: Stanford Linear Accelerator Center, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 621784
• Report Number(s): SLAC-PUB--7260; CONF-9608123--; ON: DE97009018
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
AMPLITUDES
BEAM DYNAMICS
DAMPING
INSTABILITY
MECHANICAL VIBRATIONS
NOISE
OSCILLATIONS
STANFORD LINEAR COLLIDER