Using Higher Order Modes in Superconducting Accelerating Cavities for Beam Monitoring

Conference · Fri Mar 07 00:00:00 EST 2008

OSTI ID:924753

Molloy, S; Baboi, N; Eddy, N; Frisch, J; Hendrickson, L; Hensler, O; McCormick, D; May, J; Nagaitsev, S; Napoly, O; Paparella, R C; Petrosyan, L; Piccolli, L; Rechenmacher, R; Ross, M; Simon, C; Smith, T; Watanabe, K; Wendt, M

Dipole modes have been shown to be successful diagnostics for the beam position in superconducting accelerating cavities at the Free Electron Laser in Hamburg (FLASH) facility at DESY. By help of downmixing electronics the signals from the two higher order mode (HOM) couplers mounted on each cavity are monitored. The calibration, based on singular value decomposition, is more complicated than in standard position monitors. Position like signals based on this calibration are currently being in the process of being included in the control system. A second setup based on digitizing the spectrum from the HOM couplers has been used for monitoring monopole modes. The beam phase with respect to the RF has been thus monitored. The position calibration measurements and phase monitoring made at the FLASH are presented.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 924753
• Report Number(s): SLAC-PUB-13153; TRN: US0802931
• Resource Relation: Conference: Presented at 2006 Linear Accelerator Conference (LINAC 06), Knoxville, Tennessee, 21-25 Aug 2006
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM MONITORING
BEAM POSITION
CALIBRATION
CAVITIES
CONTROL SYSTEMS
DIPOLES
FREE ELECTRON LASERS
LINEAR ACCELERATORS
MONITORING
MONITORS
MONOPOLES
Accelerators
ACCPHY