skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electron beam bunch length characterizations using incoherent and coherent radiation on the APS SASE FEL project.

Abstract

The Advanced Photon Source (APS) injector linac has been reconfigured with a low-emittance rf thermionic gun and a photocathode (PC) rf gun to support self-amplified spontaneous emission (SASE) free-electron laser (FEL) experiments. One of the most critical parameters for optimizing SASE performance (gain length) is the electron beam peak current, which requires a charge measurement and a bunch length measurement capability. We report here initial measurements of the latter using both incoherent optical transition radiation (OTR) and coherent transition radiation (CTR), A visible light Hamarnatsu C5680 synchroscan streak camera was used to measure the thermionic rf gun beam's bunch length ({sigma} {approximately}2 to 3ps) via OTR generated by the beam at 220 MeV and 200 mA macropulse average current. In addition, a CTR monitor (Michelson Interferometer) based on a Golay cell as the far infrared (FIR) detector has been installed at the 40-MeV station in the beamline. Initial observation s of CTR signal strength variation with gun a-magnet current and interferograms have been obtained. Progress in characterizing the beam at these locations and a comparison to other bunch length determinations will be presented.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
11807
Report Number(s):
ANL/ASD/CP-99024
TRN: US0103685
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 21st International Free Electron Laser Conference, Hamburg (DE), 08/23/1999--08/28/1999; Other Information: Supercedes report DE00011807; PBD: 28 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED PHOTON SOURCE; COHERENT RADIATION; ELECTRON BEAMS; FREE ELECTRON LASERS; BEAM MONITORS; PERFORMANCE; PHOTOCATHODES; STREAK CAMERAS; THERMIONICS; TRANSITION RADIATION; LINEAR ACCELERATORS; RF SYSTEMS; BEAM CURRENTS; BEAM BUNCHING

Citation Formats

Berg, W. J., Happek, U., Lewellen, J. W., Lumpkin, A. H., Sereno, N. S., and Yang, B. X. Electron beam bunch length characterizations using incoherent and coherent radiation on the APS SASE FEL project.. United States: N. p., 1999. Web.
Berg, W. J., Happek, U., Lewellen, J. W., Lumpkin, A. H., Sereno, N. S., & Yang, B. X. Electron beam bunch length characterizations using incoherent and coherent radiation on the APS SASE FEL project.. United States.
Berg, W. J., Happek, U., Lewellen, J. W., Lumpkin, A. H., Sereno, N. S., and Yang, B. X. Sat . "Electron beam bunch length characterizations using incoherent and coherent radiation on the APS SASE FEL project.". United States. https://www.osti.gov/servlets/purl/11807.
@article{osti_11807,
title = {Electron beam bunch length characterizations using incoherent and coherent radiation on the APS SASE FEL project.},
author = {Berg, W. J. and Happek, U. and Lewellen, J. W. and Lumpkin, A. H. and Sereno, N. S. and Yang, B. X.},
abstractNote = {The Advanced Photon Source (APS) injector linac has been reconfigured with a low-emittance rf thermionic gun and a photocathode (PC) rf gun to support self-amplified spontaneous emission (SASE) free-electron laser (FEL) experiments. One of the most critical parameters for optimizing SASE performance (gain length) is the electron beam peak current, which requires a charge measurement and a bunch length measurement capability. We report here initial measurements of the latter using both incoherent optical transition radiation (OTR) and coherent transition radiation (CTR), A visible light Hamarnatsu C5680 synchroscan streak camera was used to measure the thermionic rf gun beam's bunch length ({sigma} {approximately}2 to 3ps) via OTR generated by the beam at 220 MeV and 200 mA macropulse average current. In addition, a CTR monitor (Michelson Interferometer) based on a Golay cell as the far infrared (FIR) detector has been installed at the 40-MeV station in the beamline. Initial observation s of CTR signal strength variation with gun a-magnet current and interferograms have been obtained. Progress in characterizing the beam at these locations and a comparison to other bunch length determinations will be presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: