Copper Prototype Measurements of the HOM, LOM and SOM Couplers for the ILC Crab Cavity

Conference · Mon Jun 23 04:00:00 EDT 2008 · Conf.Proc.C0806233:mopp009,2008

OSTI ID:938467

Burt, G; Ambattu, P K; Dexter, A C; Bellantoni, L; Goudket, P; McIntosh, P A; Li, Z; Xiao, L

The ILC Crab Cavity is positioned close to the IP and delivered luminosity is very sensitive to the wakefields induced in it by the beam. A set of couplers were designed to couple to and damp the spurious modes of the crab cavity. As the crab cavity operates using a dipole mode, it has different damping requirements from an accelerating cavity. A separate coupler is required for the monopole modes below the operating frequency of 3.9 GHz (known as the LOMs), the opposite polarization of the operating mode (the SOM), and the modes above the operating frequency (the HOMs). Prototypes of each of these couplers have been manufactured out of copper and measured attached to an aluminum nine cell prototype of the cavity and their external Q factors were measured. The results were found to agree well with numerical simulations.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 938467
• Report Number(s): FERMILAB-CONF-08-379-AD-TD
• Conference Information: Journal Name: Conf.Proc.C0806233:mopp009,2008
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ALUMINIUM
Accelerators
COPPER
CRABS
DAMPING
DIPOLES
LUMINOSITY
MONOPOLES
POLARIZATION