Using Higher Order Modes in Superconducting Accelerating Cavities for Beam Monitoring

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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 ... continued below

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3 pages

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Molloy, S.; Baboi, N.; Eddy, N.; Frisch, J.; Hendrickson, L.; Hensler, O. et al. March 7, 2008.

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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.

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3 pages

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  • Presented at 2006 Linear Accelerator Conference (LINAC 06), Knoxville, Tennessee, 21-25 Aug 2006

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  • Report No.: SLAC-PUB-13153
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 924753
  • Archival Resource Key: ark:/67531/metadc900457

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  • March 7, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 2, 2016, 5:59 p.m.

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Molloy, S.; Baboi, N.; Eddy, N.; Frisch, J.; Hendrickson, L.; Hensler, O. et al. Using Higher Order Modes in Superconducting Accelerating Cavities for Beam Monitoring, article, March 7, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc900457/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.