A Simple, Low Cost Longitudinal Phase Space Diagnostic

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For proper operation of the LCLS [1] x-ray free-electron laser (FEL), and other similar machines, measurement and control of the electron bunch longitudinal phase space is critical. The LCLS accelerator includes two bunch compressor chicanes to magnify the peak current. These magnetic chicanes can generate significant coherent synchrotron radiation (CSR), which can distort the phase space distribution. We propose a diagnostic scheme by exciting a weak skew quadrupole at an energy-chirped, high dispersion point in the first LCLS bunch compressor (BC1) to reconstruct longitudinal phase space on an OTR screen after BC1, allowing a time-resolved characterization of CSR effects.

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3 pages

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Bertsche, Kirk; Emma, Paul; /SLAC; Shevchenko, Oleg & /Novosibirsk, IYF May 15, 2009.

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For proper operation of the LCLS [1] x-ray free-electron laser (FEL), and other similar machines, measurement and control of the electron bunch longitudinal phase space is critical. The LCLS accelerator includes two bunch compressor chicanes to magnify the peak current. These magnetic chicanes can generate significant coherent synchrotron radiation (CSR), which can distort the phase space distribution. We propose a diagnostic scheme by exciting a weak skew quadrupole at an energy-chirped, high dispersion point in the first LCLS bunch compressor (BC1) to reconstruct longitudinal phase space on an OTR screen after BC1, allowing a time-resolved characterization of CSR effects.

Physical Description

3 pages

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  • Presented at Particle Accelerator Conference (PAC 09), Vancouver, BC, Canada, 4-8 May 2009

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  • Report No.: SLAC-PUB-13614
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 952982
  • Archival Resource Key: ark:/67531/metadc933035

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Office of Scientific & Technical Information Technical Reports

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  • May 15, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:32 p.m.

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Bertsche, Kirk; Emma, Paul; /SLAC; Shevchenko, Oleg & /Novosibirsk, IYF. A Simple, Low Cost Longitudinal Phase Space Diagnostic, article, May 15, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc933035/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.