Bunch Length Measurements using Coherent Radiation

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The accelerating field that can be obtained in a beam-driven plasma wakefield accelerator depends on the current of the electron beam that excites the wake. In the E-167 experiment, a peak current above 10 kA will be delivered at a particle energy of 28 GeV. The bunch has a length of a few ten micrometers and several methods are used to measure its longitudinal profile. Among these, autocorrelation of coherent transition radiation (CTR) is employed. The beam passes a thin metallic foil, where it emits transition radiation. For wavelengths greater than the bunch length, this transition radiation is emitted coherently. ... continued below

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3 pages

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Ischebeck, Rasmus; Barnes, Christopher; Blumenfeld, Ian; Decker, Franz-Josef; Hogan, Mark; Iverson, Richard H. et al. June 24, 2005.

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The accelerating field that can be obtained in a beam-driven plasma wakefield accelerator depends on the current of the electron beam that excites the wake. In the E-167 experiment, a peak current above 10 kA will be delivered at a particle energy of 28 GeV. The bunch has a length of a few ten micrometers and several methods are used to measure its longitudinal profile. Among these, autocorrelation of coherent transition radiation (CTR) is employed. The beam passes a thin metallic foil, where it emits transition radiation. For wavelengths greater than the bunch length, this transition radiation is emitted coherently. This amplifies the long-wavelength part of the spectrum. A scanning Michelson interferometer is used to autocorrelate the CTR. However, this method requires the contribution of many bunches to build an autocorrelation trace. The measurement is influenced by the transmission characteristics of the vacuum window and beam splitter. We present here an analysis of materials, as well as possible layouts for a single shot CTR autocorrelator.

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3 pages

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  • Presented at Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005

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  • Report No.: SLAC-PUB-11249
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 890253
  • Archival Resource Key: ark:/67531/metadc876594

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  • June 24, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 8:45 p.m.

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Ischebeck, Rasmus; Barnes, Christopher; Blumenfeld, Ian; Decker, Franz-Josef; Hogan, Mark; Iverson, Richard H. et al. Bunch Length Measurements using Coherent Radiation, article, June 24, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc876594/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.