Effects of Tapered Betafunction in the LCLS Undulators

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The Linac Coherent Light Source (LCLS) is an X-ray free-electron laser (FEL) project based on the SLAC linac [1]. With its nominal set of electron beam, focusing and undulator parameters, it is designed to achieve SASE saturation at an undulator length of about 100 m with an average power of 10 GW. In order to keep the electron beam focused in the undulators, a FODO lattice is integrated along the entire length of the undulators. Nominally, the quadrupole strengths are chosen to produce nearly constant betafunction and beam size along the undulator, optimized for the FEL interaction in the exponential ... continued below

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3 pages

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Goldammer, K.; Emma, P. & Huang, Z. September 30, 2005.

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The Linac Coherent Light Source (LCLS) is an X-ray free-electron laser (FEL) project based on the SLAC linac [1]. With its nominal set of electron beam, focusing and undulator parameters, it is designed to achieve SASE saturation at an undulator length of about 100 m with an average power of 10 GW. In order to keep the electron beam focused in the undulators, a FODO lattice is integrated along the entire length of the undulators. Nominally, the quadrupole strengths are chosen to produce nearly constant betafunction and beam size along the undulator, optimized for the FEL interaction in the exponential growth regime. Since these quadrupoles are electromagnetic, it is possible to adjust the individual quadrupole strength to vary the betafunction and the beam size along the undulator, tailoring the FEL interaction in the start-up and the saturation regimes. In this paper, we present simulation studies of the tapered betafunction in the LCLS undulator and discuss the generated X-ray properties.

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3 pages

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  • Contributed to 27th International Free Electron Laser Conference (FEL 2005), Stanford, California, 21-26 Aug 2005

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  • Report No.: SLAC-PUB-11457
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878374
  • Archival Resource Key: ark:/67531/metadc877982

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Office of Scientific & Technical Information Technical Reports

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

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  • September 30, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 5, 2016, 2:46 p.m.

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Goldammer, K.; Emma, P. & Huang, Z. Effects of Tapered Betafunction in the LCLS Undulators, article, September 30, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc877982/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.