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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:
 [1];  [1];  [2];  [3];  [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. STFC/DL/ASTeC, Daresbury, Warrington, Cheshire (United Kingdom)
  3. USTRAT/SUPA, Glasgow, Scotland (United Kingdom)
  4. PSI, Villigen PSI (Switzerland)
Publication Date:
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: ISBN 978-3-95450-179-3
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
FEL2017 Proceedings
Additional Journal Information:
Conference: 38th International Free-Electron Laser Conference, Santa Fe, New Mexico, USA, Aug. 20-25, 2017
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; 47 OTHER INSTRUMENTATION

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. https://doi.org/10.18429/JACoW-FEL2017-MOP016.
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
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.
@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 = {FEL2017 Proceedings},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
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Publisher's Version of Record

Figures / Tables:

Figure 1 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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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.