Optimization of the LCLS X-Ray FEL Output Performance in the Presence of Strong Undulator Wakefields

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The Linac Coherent Light Source (LCLS) Free-Electron Laser will operate in the wavelength range of 1.5 to 15 Angstroms. Energy loss due to wakefields within the long undulator can degrade the FEL process by detuning the resonant FEL frequency. The wakefields arise from the vacuum chamber wall resistivity, its surface roughness, and abrupt changes in its aperture. For LCLS parameters, the resistive component is the most critical and depends upon the chamber material (e.g. Cu) and its radius. To study the expected performance in the presence of these wakefields, we make a series of start-to-end simulations with tracking codes PARMELA … continued below

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Reiche, S.; Bane, K. L. F.; Emma, P.; Huang, Z.; Nuhn, H. D.; Stupakov, G. V. et al. March 17, 2006.

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  • Reiche, S. University of California, Los Angeles, CA, 90095, USA
  • Bane, K. L. F. Stanford Linear Accelerator Center, Menlo park, CA 94025, USA
  • Emma, P. Stanford Linear Accelerator Center, Menlo park, CA 94025, USA
  • Huang, Z. Stanford Linear Accelerator Center, Menlo park, CA 94025, USA
  • Nuhn, H. D. Stanford Linear Accelerator Center, Menlo park, CA 94025, USA
  • Stupakov, G. V. Stanford Linear Accelerator Center, Menlo park, CA 94025, USA
  • Fawley, W. M. Lawrence Berkeley National Laboratory, Berkeley, CA, USA

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The Linac Coherent Light Source (LCLS) Free-Electron Laser will operate in the wavelength range of 1.5 to 15 Angstroms. Energy loss due to wakefields within the long undulator can degrade the FEL process by detuning the resonant FEL frequency. The wakefields arise from the vacuum chamber wall resistivity, its surface roughness, and abrupt changes in its aperture. For LCLS parameters, the resistive component is the most critical and depends upon the chamber material (e.g. Cu) and its radius. To study the expected performance in the presence of these wakefields, we make a series of start-to-end simulations with tracking codes PARMELA and ELEGANT and time-dependent FEL simulation codes Genesis 1.3 and Ginger. We discuss the impact of the wakefield on output energy, spectral bandwidth, and temporal envelope of the output FEL pulse, as well as the benefits of a partial compensation obtained with a slight z dependent taper in the undulator field. We compare these results to those obtained by decreasing the bunch charge or increasing the vacuum chamber radius. We also compare our results to those predicted in concurrent analytical work.

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3 pages

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http://www.slac.stanford.edu/cgi-wrap/pubpage?slac-pub-11773.html

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

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  • Report No.: SLAC-PUB-11773
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 877454
  • Archival Resource Key: ark:/67531/metadc873490

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 17, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • May 26, 2020, 2:05 p.m.

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Reiche, S.; Bane, K. L. F.; Emma, P.; Huang, Z.; Nuhn, H. D.; Stupakov, G. V. et al. Optimization of the LCLS X-Ray FEL Output Performance in the Presence of Strong Undulator Wakefields, article, March 17, 2006; [Menlo Park, California]. (https://digital.library.unt.edu/ark:/67531/metadc873490/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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