Electronics and Algorithms for HOM Based Beam Diagnostics

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The signals from the Higher Order Mode (HOM) ports on superconducting cavities can be used as beam position monitors and to do survey structure alignment. A HOM-based diagnostic system has been installed to instrument both couplers on each of the 40 cryogenic accelerating structures in the DESY TTF2 Linac. The electronics uses a single stage down conversion form the 1.7 GHz HOM spectral line to a 20MHz IF which has been digitized. The electronics is based on low cost surface mount components suitable for large scale production. The analysis of the HOM data is based on Singular Value Decomposition. The ... continued below

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12 pages

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Frisch, Josef; Baboi, Nicoleta; Eddy, Nathan; Nagaitsev, Sergei; Hensler, Olaf; McCormick, Douglas et al. October 16, 2006.

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Description

The signals from the Higher Order Mode (HOM) ports on superconducting cavities can be used as beam position monitors and to do survey structure alignment. A HOM-based diagnostic system has been installed to instrument both couplers on each of the 40 cryogenic accelerating structures in the DESY TTF2 Linac. The electronics uses a single stage down conversion form the 1.7 GHz HOM spectral line to a 20MHz IF which has been digitized. The electronics is based on low cost surface mount components suitable for large scale production. The analysis of the HOM data is based on Singular Value Decomposition. The response of the OM modes is calibrated using conventional BPMs.

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12 pages

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  • Presented at 12th Beam Instrumentation Workshop (BIW06), Fermilab, Batavia, Illinois, 1-4 May 2006

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  • Report No.: SLAC-PUB-12161
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 893771
  • Archival Resource Key: ark:/67531/metadc886556

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  • October 16, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 5, 2016, 2:56 p.m.

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Frisch, Josef; Baboi, Nicoleta; Eddy, Nathan; Nagaitsev, Sergei; Hensler, Olaf; McCormick, Douglas et al. Electronics and Algorithms for HOM Based Beam Diagnostics, article, October 16, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc886556/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.