Beam Position Monitoring using the HOM-Signals from a Damped and Detuned Accelerating Structure

Conference · Tue May 17 04:00:00 EDT 2005

OSTI ID:890821

Dobert, S; Adolphsen, C; Jones, R; Lewandowski, J; Li, Z; Pivi, M; Wang, J; Higo, T

The Next and Global Linear Collider (NLC/GLC) designs require precision alignment of the beam in the accelerator structures to reduce short range wakefields. The moderately damped and detuned structures themselves provide suitable higher order mode (HOM) signals to measure this alignment. The modes in the lowest dipole band, whose frequencies range from 14-16 GHz, provide the strongest signals. To determine the position resolution they provide, an NLC/GLC prototype structure that was installed in the ASSET facility of the SLAC Linac was instrumented to downmix and digitize these signals. The beam position within the structure was determined by simultaneously measuring the signals at three frequencies (14.3, 15, 15.7 GHz) corresponding to modes localized at the beginning, the middle and the end of the 60 cm long structure. A resolution of 1 micron was achieved even with 28 dB signal attenuation, which is better than the 5 micron resolution required for the NLC/GLC.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 890821
• Report Number(s): SLAC-PUB-11206
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ACCURACY
ALIGNMENT
ATTENUATION
Accelerators
ACCPHY
BEAM POSITION
DIPOLES
LINEAR ACCELERATORS
LINEAR COLLIDERS
MONITORING
RESOLUTION
STANFORD LINEAR ACCELERATOR CENTER