Beam Conditioning for Free Electron Lasers:Consequences and Methods

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The consequences of beam conditioning in four example cases [VISA, a soft x-ray free-electron laser (FEL), LCLS, and a 'Greenfield' FEL] are examined. It is shown that in emittance limited cases, proper conditioning reduces sensitivity to the transverse emittance and, furthermore, allows for stronger focusing in the undulator. Simulations show higher saturation power, with gain lengths reduced by a factor of 2 or more. The beam dynamics in a general conditioning system are studied, with 'matching conditions' derived for achieving conditioning without growth in the effective emittance. Various conditioning lattices are considered, and expressions derived for the amount of conditioning ... continued below

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10 pages

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Wolski, A.; Penn, G.; Sessler, A.; Wurtele, J. & /LBL, Berkeley /UC, Berkeley, Astron. Dept. December 14, 2010.

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The consequences of beam conditioning in four example cases [VISA, a soft x-ray free-electron laser (FEL), LCLS, and a 'Greenfield' FEL] are examined. It is shown that in emittance limited cases, proper conditioning reduces sensitivity to the transverse emittance and, furthermore, allows for stronger focusing in the undulator. Simulations show higher saturation power, with gain lengths reduced by a factor of 2 or more. The beam dynamics in a general conditioning system are studied, with 'matching conditions' derived for achieving conditioning without growth in the effective emittance. Various conditioning lattices are considered, and expressions derived for the amount of conditioning provided in each case when the matching conditions are satisfied. These results show that there is no fundamental obstacle to producing beam conditioning, and that the problem can be reduced to one of proper lattice design. Nevertheless, beam conditioning will not be easy to implement in practice.

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10 pages

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  • Journal Name: Phys.Rev.ST Accel.Beams 7:080701,2004

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  • Report No.: SLAC-PUB-14337
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevSTAB.7.080701 | External Link
  • Office of Scientific & Technical Information Report Number: 1000382
  • Archival Resource Key: ark:/67531/metadc830053

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  • December 14, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 2, 2016, 8:36 p.m.

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Wolski, A.; Penn, G.; Sessler, A.; Wurtele, J. & /LBL, Berkeley /UC, Berkeley, Astron. Dept. Beam Conditioning for Free Electron Lasers:Consequences and Methods, article, December 14, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc830053/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.