GINGER simulations of short-pulse effects in the LEUTL FEL

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While the long-pulse, coasting beam model is often used in analysis and simulation of self-amplified spontaneous emission (SASE) free-electron lasers (FELs), many current SASE demonstration experiments employ relatively short electron bunches whose pulse length is on the order of the radiation slippage length. In particular, the low-energy undulator test line (LEUTL) FEL at the Advanced Photon Source has recently lased and nominally saturated in both visible and near-ultraviolet wavelength regions with a sub-ps pulse length that is somewhat shorter than the total slippage length in the 22-m undulator system. In this paper we explore several characteristics of the short pulse ... continued below

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3 pages

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Huang, Z. & Fawley, W.M. July 1, 2001.

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Description

While the long-pulse, coasting beam model is often used in analysis and simulation of self-amplified spontaneous emission (SASE) free-electron lasers (FELs), many current SASE demonstration experiments employ relatively short electron bunches whose pulse length is on the order of the radiation slippage length. In particular, the low-energy undulator test line (LEUTL) FEL at the Advanced Photon Source has recently lased and nominally saturated in both visible and near-ultraviolet wavelength regions with a sub-ps pulse length that is somewhat shorter than the total slippage length in the 22-m undulator system. In this paper we explore several characteristics of the short pulse regime for SASE FELs with the multidimensional, time-dependent simulation code GINGER, concentrating on making a direct comparison with the experimental results from LEUTL. Items of interest include the radiation gain length, pulse energy, saturation position, and spectral bandwidth. We address the importance of short-pulse effects when scaling the LEUTL results to proposed x-ray FELs and also briefly discuss the possible importance of coherent spontaneous emission at startup.

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3 pages

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INIS; OSTI as DE00788028

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  • 2001 Particle Accelerator Conference, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: LBNL--47262
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 788028
  • Archival Resource Key: ark:/67531/metadc724814

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  • July 1, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 4, 2016, 3:18 p.m.

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Huang, Z. & Fawley, W.M. GINGER simulations of short-pulse effects in the LEUTL FEL, article, July 1, 2001; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc724814/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.