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Title: GINGER simulations of short-pulse effects in the LEUTL FEL

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director, Office of Science (US)
OSTI Identifier:
788028
Report Number(s):
LBNL-47262
R&D Project: 455301; TRN: US0110641
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: 2001 Particle Accelerator Conference, Chicago, IL (US), 06/18/2001--06/22/2001; Other Information: PBD: 1 Jul 2001
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; FREE ELECTRON LASERS; ADVANCED PHOTON SOURCE; SATURATION; COMPUTERIZED SIMULATION; WAVELENGTHS; WIGGLER MAGNETS; G CODES

Citation Formats

Huang, Z., and Fawley, W.M. GINGER simulations of short-pulse effects in the LEUTL FEL. United States: N. p., 2001. Web.
Huang, Z., & Fawley, W.M. GINGER simulations of short-pulse effects in the LEUTL FEL. United States.
Huang, Z., and Fawley, W.M. Sun . "GINGER simulations of short-pulse effects in the LEUTL FEL". United States. https://www.osti.gov/servlets/purl/788028.
@article{osti_788028,
title = {GINGER simulations of short-pulse effects in the LEUTL FEL},
author = {Huang, Z. and Fawley, W.M.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jul 01 00:00:00 EDT 2001},
month = {Sun Jul 01 00:00:00 EDT 2001}
}

Conference:
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