Enhancing FEL Power with Phase Shifters

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Tapering the undulator parameter is a well-known method for maintaining the resonant condition past saturation, and increasing Free Electron Laser (FEL) efficiency. In this paper, we demonstrate that shifting the electron bunch phase relative to the radiation is equivalent to tapering the undulator parameter. Using discrete phase changes derived from optimized undulator tapers for the Linac Coherent Light Source (LCLS) x-ray FEL, we show that appropriate phase shifts between undulator sections can reproduce the power enhancement of undulator tapers. Phase shifters are relatively easy to implement and operate, and could be used to aid or replace undulator tapers in optimizing ... continued below

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4 pages

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Ratner, Daniel; U., /Stanford; Chao, Alex; Huang, Zhirong; /SLAC & , July 30, 2010.

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Description

Tapering the undulator parameter is a well-known method for maintaining the resonant condition past saturation, and increasing Free Electron Laser (FEL) efficiency. In this paper, we demonstrate that shifting the electron bunch phase relative to the radiation is equivalent to tapering the undulator parameter. Using discrete phase changes derived from optimized undulator tapers for the Linac Coherent Light Source (LCLS) x-ray FEL, we show that appropriate phase shifts between undulator sections can reproduce the power enhancement of undulator tapers. Phase shifters are relatively easy to implement and operate, and could be used to aid or replace undulator tapers in optimizing FEL performance.

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4 pages

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  • Contributed to 29th International Free Electron Laser Conference (FEL 07), Novosibirsk, Russia, 26-31 Aug 2007

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  • Report No.: SLAC-PUB-14192
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 984332
  • Archival Resource Key: ark:/67531/metadc1014078

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  • July 30, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 2, 2017, 8:11 p.m.

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Ratner, Daniel; U., /Stanford; Chao, Alex; Huang, Zhirong; /SLAC & ,. Enhancing FEL Power with Phase Shifters, article, July 30, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1014078/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.