Studies of beam induced dipole-mode signals in accelerating structures at the SLC

Conference · Sun Jun 01 04:00:00 EDT 1997

OSTI ID:335185

Seidel, M

Beam emittance dilution by self induced transverse fields (wakefields) in accelerating structures is a key problem in linear accelerators. To minimize the wakefield effects the beam trajectory must be precisely centered within the structures. An efficient way to achieve this is to detect beam induced microwave signals in the lowest dipole mode band and to steer the beam by minimizing these signals. This paper briefly covers some experiences from SLC S-band structures, but mainly concentrates on results of a wakefield instrumentation scheme applied to a NLC prototype X-band structure and tested with beam in the SLC linac. A beam based in-situ structure straightness measurement is shown as well as results of beam steering experiments based on phase and amplitude detection of two separated modes in the structure. After centering the beam the reduction of the wakefield was demonstrated independently by probing it with a test bunch that is deflected by the residual wakefield at a short distance behind the drive bunch.

• Research Organization: Stanford Univ., 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: 335185
• Report Number(s): SLAC-PUB--7557; CONF-970503--; ON: DE99002441
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM DYNAMICS
BEAM EMITTANCE
BEAM MONITORS
BEAM POSITION
ELECTROMAGNETIC FIELDS
STANFORD LINEAR COLLIDER