Reflectivity Measurements for Copper and Aluminumin the Far Infrared and the Resistive Wall Impedance in the LCLSUndulator

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Reflectivity measurements in the far infrared, performed on aluminum and copper samples, are presented and analyzed. Over a frequency range of interest for the LCLS bunch, the data is fit to the free-electron model, and to one including the anomalous skin effect. The models fit well, yielding parameters dc conductivity and relaxation times that are within 30-40% of expected values. We show that the induced energy in the LCLS undulator region is relatively insensitive to variations on this order, and thus we can have confidence that the wake effect will be close to what is expected.

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4 pages

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Bane, K.L.F.; Stupakov, G.; /SLAC; Tu, J.J. & /City Coll., N.Y. June 27, 2006.

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Reflectivity measurements in the far infrared, performed on aluminum and copper samples, are presented and analyzed. Over a frequency range of interest for the LCLS bunch, the data is fit to the free-electron model, and to one including the anomalous skin effect. The models fit well, yielding parameters dc conductivity and relaxation times that are within 30-40% of expected values. We show that the induced energy in the LCLS undulator region is relatively insensitive to variations on this order, and thus we can have confidence that the wake effect will be close to what is expected.

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4 pages

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  • Presented at European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006

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  • Report No.: SLAC-PUB-11924
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 885277
  • Archival Resource Key: ark:/67531/metadc876471

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  • June 27, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 1:54 p.m.

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Bane, K.L.F.; Stupakov, G.; /SLAC; Tu, J.J. & /City Coll., N.Y. Reflectivity Measurements for Copper and Aluminumin the Far Infrared and the Resistive Wall Impedance in the LCLSUndulator, article, June 27, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc876471/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.