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Coherent optical transition radiation and self-amplified spontaneous emission generated by chicane-compressed electron beams
Phys. Rev. ST Accel. Beams 12, 040704 – Published 29 April, 2009Erratum Phys. Rev. ST Accel. Beams 12, 059901 (2009)
DOI: https://doi.org/10.1103/PhysRevSTAB.12.040704
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 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 microbunching instability which leads to coherent OTR 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 regime as reported at FEL02 may be attributed to such beam structure entering the FEL undulators and inducing the SASE startup at those “prebunched” structures. Separate beam structures 120 microns apart in and 2.9 nm apart in wavelength were reported. The details of these observations and operational parameters will be presented.
Corrections
19 May, 2009
Erratum
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References (21)
- S. V. Milton et al., Science 292, 2037 (2001).
- A. H. Lumpkin et al., Phys. Rev. Lett. 86, 79 (2001).
- A. H. Lumpkin et al., Phys. Rev. Lett. 88, 234801 (2002).
- A. H. Lumpkin et al., Nucl. Instrum. Methods Phys. Res., Sect. A 483, 402 (2002).
- A. H. Lumpkin et al., “Evidence for Transverse Dependencies in COTR and Microbunching in a SASE FEL,” in Proceedings of the 23rd FEL Conference, Argonne, IL, 2002; Nucl. Instrum. Methods Phys. Res., Sect. A 507, 200 (2003).
- M. Borland et al., Nucl. Instrum. Methods Phys. Res., Sect. A 483, 268 (2002).
- E. L. Saldin, E. A. Schneidmiller, and M. V. Yurkov, Nucl. Instrum. Methods Phys. Res., Sect. A 490, 1 (2002).
- E. L. Saldin, E. A. Schneidmiller, and M. V. Yurkov, DESY Report No. TESLA-FEL-2003-02, 2003.
- Z. Huang et al., Phys. Rev. ST Accel. Beams 7, 074401 (2004).
- D. H. Dowell et al., in Proceedings of FEL07, Novosibirsk, 2007, WEAAU01.
- A. H. Lumpkin et al., “Observations of Enhanced OTR Signals from a Compressed Electron Beam,” in Proceedings of BIW08, Tahoe, CA, 2008 (to be published).
- A. H. Lumpkin et al., in Proceedings of FEL05 eConf C0508213, 608 (2005).
- B. Yang, E. Rotela, S. Kim, R. Lill, and S. Sharma, AIP Conf. Proc. 648, 393 (2002).
- For example, see the CCD sensitivity charts which include Pulnix cameras on http://www.jai.com.
- A. H. Lumpkin et al., “Spectral and Charge-dependence Aspects of Enhanced OTR Signals from a Compressed Electron Beam,” in Proceedings of Linac08, Victoria, BC, 2008 (to be published).
- A. H. Lumpkin, N. S. Sereno, W. Berg, M. Borland, Y. Li, and S. Pasky (unpublished).
- S. Reiche, Nucl. Instrum. Methods Phys. Res., Sect. A 429, 243 (1999).
- Y.-C. Chae (private communication).
- Z. Huang et al.,in the Mini Workshop on Characterization of High Brightness Beams, Zeuthen, Germany (2008).
- Agenda for Mini Workshop on Characterization of High Brightness Beams, Zeuthen (2008).
- Agenda for Microbunching Instability Workshop II, Chairman W. M. Fawley, LBNL, Berkeley CA, 2008.
