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

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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 ... continued below

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3 pages

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Burt, G.; Ambattu, P.K.; Dexter, A.C.; U., /Lancaster; Bellantoni, L.; /Fermilab et al. November 4, 2011.

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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.

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3 pages

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  • Journal Name: Conf.Proc.C0806233:mopp009,2008; Conference: EPAC'08, 11th European Particle Accelerator Conference, 23-27 June 2008, Genoa, Italy

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  • Report No.: SLAC-PUB-14683
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1028689
  • Archival Resource Key: ark:/67531/metadc840098

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  • November 4, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 8, 2016, 3:09 p.m.

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Burt, G.; Ambattu, P.K.; Dexter, A.C.; U., /Lancaster; Bellantoni, L.; /Fermilab et al. Copper Prototype Measurements of the HOM, LOM And SOM Couplers for the ILC Crab Cavity, article, November 4, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc840098/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.