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

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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 ... continued below

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20 pages

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Lumpkin, A.H.; /Fermilab; Dejus, R.J.; Sereno, N.S. & /Argonne February 1, 2009.

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Description

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.

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20 pages

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  • Journal Name: Phys.Rev.ST Accel.Beams 12:040704,2009

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  • Report No.: FERMILAB-PUB-08-612-AD
  • Grant Number: AC02-07CH11359
  • DOI: 10.1103/PhysRevSTAB.12.040704 | External Link
  • Office of Scientific & Technical Information Report Number: 949781
  • Archival Resource Key: ark:/67531/metadc933600

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 1, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 22, 2016, 10:42 p.m.

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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, article, February 1, 2009; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc933600/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.