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Title: Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams

Abstract

Observations of strongly enhanced optical transition radiation (OTR) following significant bunch compression of photoinjector beams by a chicane have been reported during the commissioning of the Linac Coherent Light Source (LCLS) accelerator and recently at the Advanced Photon Source (APS) linac. These localized transverse spatial features involve signal enhancements of nearly a factor of 10 and 100 in the APS case at the 150-MeV and 375-MeV OTR stations, respectively. They are consistent with a coherent process seeded by noise and may be evidence of a longitudinal space charge (LSC) microbunching instability which leads to coherent OTR (COTR) emissions. Additionally, we suggest that localized transverse structure in the previous self-amplified spontaneous emission (SASE) free-electron laser (FEL) data at APS in the visible-UV regime as reported at FEL02 may be attributed to such beam structure entering the FEL undulators and inducing the SASE startup at those structures. Separate beam structures 120 microns apart in x and 2.9 nm apart in wavelength were reported. The details of these observations and operational parameters will be presented.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
949781
Report Number(s):
FERMILAB-PUB-08-612-AD
TRN: US0901791
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.ST Accel.Beams 12:040704,2009
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; ADVANCED PHOTON SOURCE; COMMISSIONING; COMPRESSION; ELECTRON BEAMS; FREE ELECTRON LASERS; INSTABILITY; LIGHT SOURCES; LINEAR ACCELERATORS; SPACE CHARGE; TRANSITION RADIATION; WAVELENGTHS; WIGGLER MAGNETS; Accelerators

Citation Formats

Lumpkin, A.H., /Fermilab, Dejus, R.J., Sereno, N.S., and /Argonne. Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams. United States: N. p., 2009. Web. doi:10.1103/PhysRevSTAB.12.040704.
Lumpkin, A.H., /Fermilab, Dejus, R.J., Sereno, N.S., & /Argonne. Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams. United States. doi:10.1103/PhysRevSTAB.12.040704.
Lumpkin, A.H., /Fermilab, Dejus, R.J., Sereno, N.S., and /Argonne. Sun . "Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams". United States. doi:10.1103/PhysRevSTAB.12.040704. https://www.osti.gov/servlets/purl/949781.
@article{osti_949781,
title = {Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams},
author = {Lumpkin, A.H. and /Fermilab and Dejus, R.J. and Sereno, N.S. and /Argonne},
abstractNote = {Observations of strongly enhanced optical transition radiation (OTR) following significant bunch compression of photoinjector beams by a chicane have been reported during the commissioning of the Linac Coherent Light Source (LCLS) accelerator and recently at the Advanced Photon Source (APS) linac. These localized transverse spatial features involve signal enhancements of nearly a factor of 10 and 100 in the APS case at the 150-MeV and 375-MeV OTR stations, respectively. They are consistent with a coherent process seeded by noise and may be evidence of a longitudinal space charge (LSC) microbunching instability which leads to coherent OTR (COTR) emissions. Additionally, we suggest that localized transverse structure in the previous self-amplified spontaneous emission (SASE) free-electron laser (FEL) data at APS in the visible-UV regime as reported at FEL02 may be attributed to such beam structure entering the FEL undulators and inducing the SASE startup at those structures. Separate beam structures 120 microns apart in x and 2.9 nm apart in wavelength were reported. The details of these observations and operational parameters will be presented.},
doi = {10.1103/PhysRevSTAB.12.040704},
journal = {Phys.Rev.ST Accel.Beams 12:040704,2009},
number = ,
volume = ,
place = {United States},
year = {Sun Feb 01 00:00:00 EST 2009},
month = {Sun Feb 01 00:00:00 EST 2009}
}