Effects of Beamtube Roughness on X-Ray FEL Performance

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In an X-Ray FEL like the Linear Coherent Light Source (LCLS) being designed at SLAC, electron bunches about 70 {micro}m FWHM long are sent into a beam tube only 5 mm in internal diameter and more than 100 m in length. Due to the surface roughness of the beam tube, wakefields can be generated that catch up to the bunch and interact with it, causing energy spread and emittance growth. The strength of this effect depends on the details of the roughness of the surface. We present here a study in which the roughness of the beam tube was measured, ... continued below

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Stupakov, Gennady April 5, 1999.

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Description

In an X-Ray FEL like the Linear Coherent Light Source (LCLS) being designed at SLAC, electron bunches about 70 {micro}m FWHM long are sent into a beam tube only 5 mm in internal diameter and more than 100 m in length. Due to the surface roughness of the beam tube, wakefields can be generated that catch up to the bunch and interact with it, causing energy spread and emittance growth. The strength of this effect depends on the details of the roughness of the surface. We present here a study in which the roughness of the beam tube was measured, and the longitudinal impedance of the tube was calculated. Our result shows that commercially available beam tube can be made smooth enough so the resulting wakefield effects are within the tolerance determined by the requirement that the induced relative energy spread of the beam be less then 5 x 10{sup {minus}4}.

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  • Other Information: PBD: 5 Apr 1999

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  • Report No.: SLAC-PUB-8108
  • Grant Number: AC03-76SF00515
  • DOI: 10.2172/10047 | External Link
  • Office of Scientific & Technical Information Report Number: 10047
  • Archival Resource Key: ark:/67531/metadc627644

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  • April 5, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 5, 2016, 6:58 p.m.

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Stupakov, Gennady. Effects of Beamtube Roughness on X-Ray FEL Performance, report, April 5, 1999; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc627644/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.