Output characteristics of SASE-driven short wavelength FEL`s

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This paper investigates various properties of the ``microspikes`` associated with self-amplified spontaneous emission (SASE) in a short wavelength free-electron laser (FEL). Using results from the 2-D numerical simulation code GINGER, we confirm theoretical predictions such as the convective group velocity in the exponential gain regime. In the saturated gain regime beyond the initial saturation, we find that the average radiation power continues to grow with an approximately linearly dependence upon undulator length. Moreover, the spectrum significantly broadens and shifts in wavelength to the redward direction, with{ital P(w)} approaching a constant, asymptotic value. This is in marked contrast to the exponential ... continued below

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9 p.

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Fawley, W.M. February 1, 1997.

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Description

This paper investigates various properties of the ``microspikes`` associated with self-amplified spontaneous emission (SASE) in a short wavelength free-electron laser (FEL). Using results from the 2-D numerical simulation code GINGER, we confirm theoretical predictions such as the convective group velocity in the exponential gain regime. In the saturated gain regime beyond the initial saturation, we find that the average radiation power continues to grow with an approximately linearly dependence upon undulator length. Moreover, the spectrum significantly broadens and shifts in wavelength to the redward direction, with{ital P(w)} approaching a constant, asymptotic value. This is in marked contrast to the exponential gain regime where the spectrum steadily narrows, {ital P(w)} grows, and the central wavelength remains constant with {ital z}. Via use of a spectrogram diagnostic {ital S(w,t)}, it appears that the radiation pattern in the saturated gain regime is composed of an ensemble of distinct ``sinews`` whose widths AA remain approximately constant but whose central wavelengths can ``chirp`` by varying a small extent with {ital t}.

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9 p.

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OSTI as DE97004169

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  • SPIE international symposium, San Jose, CA (United States), 8-14 Feb 1997

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  • Other: DE97004169
  • Report No.: LBNL--39944
  • Report No.: CONF-970231--22
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 465806
  • Archival Resource Key: ark:/67531/metadc675082

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  • February 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • April 5, 2016, 5:04 p.m.

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Fawley, W.M. Output characteristics of SASE-driven short wavelength FEL`s, article, February 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc675082/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.