High Precision SC Cavity alignment Measurements with Higher Order Modes

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Description

Experiments at the FLASH linac at DESY have demonstrated that the higher order modes (HOMs) induced in superconducting cavities can be used to provide a variety of beam and cavity diagnostics. The centers of the cavities can be determined from the beam orbit which produces minimum power in the dipole HOM modes. The phase and amplitude of the dipole modes can be used as a high resolution beam position monitor. For most superconducting accelerators, the existing HOM couplers provide the necessary signals, and the downmix and digitizing electronics are straightforward, similar to those for a conventional BPM.

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5 pages

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Molloy, Stephen; Frisch, Josef; Hendrickson, Linda; McCormick, Douglas; May, Justin; Ross, Marc et al. June 14, 2007.

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Experiments at the FLASH linac at DESY have demonstrated that the higher order modes (HOMs) induced in superconducting cavities can be used to provide a variety of beam and cavity diagnostics. The centers of the cavities can be determined from the beam orbit which produces minimum power in the dipole HOM modes. The phase and amplitude of the dipole modes can be used as a high resolution beam position monitor. For most superconducting accelerators, the existing HOM couplers provide the necessary signals, and the downmix and digitizing electronics are straightforward, similar to those for a conventional BPM.

Physical Description

5 pages

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  • Journal Name: IOP: Measurement Science and Technology

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  • Report No.: SLAC-PUB-12349
  • Grant Number: AC02-76SF00515
  • DOI: 10.1088/0957-0233/18/8/004 | External Link
  • Office of Scientific & Technical Information Report Number: 908756
  • Archival Resource Key: ark:/67531/metadc884805

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  • June 14, 2007

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Aug. 1, 2017, 12:31 p.m.

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Molloy, Stephen; Frisch, Josef; Hendrickson, Linda; McCormick, Douglas; May, Justin; Ross, Marc et al. High Precision SC Cavity alignment Measurements with Higher Order Modes, article, June 14, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc884805/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.