Comparing FEL Codes for Advanced Configurations

Garcia, Bryant W.; Marcus, Garcia; Campbell, Lawrence T.; McNeil, Brian W. J.; Reiche, Sven

doi:10.18429/JACoW-FEL2017-MOP016

Title: Comparing FEL Codes for Advanced Configurations

Abstract

Various FEL codes employ different approximations and strategies to model the FEL radiation generation process. Many codes perform averaging procedures over various length scales in order to simplify the underlying dynamics. As FELs are developed in more advanced configurations beyond simple SASE, the assumptions of some codes may be called into question. Here, we compare the unaveraged code Puffin to averaged FEL codes including a new version of GENESIS in a variety of situations. In particular, we study a harmonic lasing setup, a High-Gain Harmonic Generation (HGHG) configuration modeled after the FERMI setup, and a potential Echo-Enabled Harmonic Generation (EEHG) configuration also at FERMI. Lastly, we find the codes are in good agreement, although small discrepancies do exist.

Authors:

Garcia, Bryant W. ^[1]; Marcus, Garcia ^[1]; Campbell, Lawrence T. ^[2]; McNeil, Brian W. J. ^[3]; Reiche, Sven ^[4]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire (United Kingdom)
USTRAT/SUPA, Glasgow, Scotland (United Kingdom)
PSI, Villigen PSI (Switzerland)

Publication Date:: Thu Feb 01 00:00:00 EST 2018

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1443903

Report Number(s):: SLAC-PUB-17138
Journal ID: ISSN 2673-5474; ISBN 978-3-95450-179-3

Grant/Contract Number:: AC02-76SF00515

Resource Type:: Accepted Manuscript

Journal Name:: Proceedings of the International Free Electron Laser Conference

Additional Journal Information:: Journal Volume: 2017; Conference: 38th International Free-Electron Laser Conference, Santa Fe, New Mexico, USA, Aug. 20-25, 2017; Journal ID: ISSN 2673-5474

Publisher:: JACoW Publishing

Country of Publication:: United States

Language:: English

Subject:: 97 MATHEMATICS AND COMPUTING; 47 OTHER INSTRUMENTATION; ion; FEL; simulation; electron; laser

Citation Formats


                    Garcia, Bryant W., Marcus, Garcia, Campbell, Lawrence T., McNeil, Brian W. J., and Reiche, Sven. Comparing FEL Codes for Advanced Configurations.  United States: N. p., 2018. 
Web.  doi:10.18429/JACoW-FEL2017-MOP016.

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                    Garcia, Bryant W., Marcus, Garcia, Campbell, Lawrence T., McNeil, Brian W. J., & Reiche, Sven. Comparing FEL Codes for Advanced Configurations.  United States.  https://doi.org/10.18429/JACoW-FEL2017-MOP016

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                    Garcia, Bryant W., Marcus, Garcia, Campbell, Lawrence T., McNeil, Brian W. J., and Reiche, Sven. Thu .  
"Comparing FEL Codes for Advanced Configurations".  United States.  https://doi.org/10.18429/JACoW-FEL2017-MOP016.  https://www.osti.gov/servlets/purl/1443903.

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@article{osti_1443903,

  title        = {Comparing FEL Codes for Advanced Configurations},

  author       = {Garcia, Bryant W. and Marcus, Garcia and Campbell, Lawrence T. and McNeil, Brian W. J. and Reiche, Sven},

  abstractNote = {Various FEL codes employ different approximations and strategies to model the FEL radiation generation process. Many codes perform averaging procedures over various length scales in order to simplify the underlying dynamics. As FELs are developed in more advanced configurations beyond simple SASE, the assumptions of some codes may be called into question. Here, we compare the unaveraged code Puffin to averaged FEL codes including a new version of GENESIS in a variety of situations. In particular, we study a harmonic lasing setup, a High-Gain Harmonic Generation (HGHG) configuration modeled after the FERMI setup, and a potential Echo-Enabled Harmonic Generation (EEHG) configuration also at FERMI. Lastly, we find the codes are in good agreement, although small discrepancies do exist.},

  doi          = {10.18429/JACoW-FEL2017-MOP016},

  journal      = {Proceedings of the International Free Electron Laser Conference},

  number       = ,

  volume       = 2017,

  place        = {United States},

  year         = {Thu Feb 01 00:00:00 EST 2018},

  month        = {Thu Feb 01 00:00:00 EST 2018}

}

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Journal Article:

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Figures / Tables:

Figure 1: Growth of the fundamental (6 keV) and third harmonic (18 keV) radiation versus z for the LCLS-I like setup. The dashed curves are a separate simulation in which the fundamental is artificially suppressed.

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