Beam Characterization and Coherent Optical Transition Radiation Studies at the Advanced Photon Source Linac
Abstract
The Advanced Photon Source facility includes a 450-MeV S-band linac with the option for injection from a photocathode (PC) rf gun. A diode-pumped, twice-frequency doubled Nd:glass regen laser (263 nm) is used with the Cu PC to generate the ele ctron beams. Characterization of these beams and studies of the microbunching instability following beam compression in the four-dipole magnetic chicane are described. A suite of diagnostics is employed including a three-screen emittance section, a FIR co herent transition radiation autocorrelator, electron spectrometers, and an optical diagnostics end station. An energy chirp impressed on the beam is used to compress the 1-2 ps, rms bunch as it passes through the chicane. With compression, bunch lengths o f 170-200 fs, rms at 450 pC are measured, and coherent optical transition radiation (COTR) due to the microbunching instability is observed. Mitigation techniques of the COTR in the beam profile diagnostics are demonstrated both spectrally and temporally. At 100 pC without compression normalized transverse emittances of 1.8 and 2.7 microns are observed in the x and y planes, in reasonable agreement with initial ASTRA simulations.
- Authors:
-
- Argonne
- Fermilab
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1406547
- Report Number(s):
- FERMILAB-CONF-12-521-AD; IPAC-2012-WEPPP072
1126904
- DOE Contract Number:
- AC02-07CH11359
- Resource Type:
- Conference
- Journal Name:
- Conf.Proc.
- Additional Journal Information:
- Journal Volume: C1205201; Conference: 3rd International Particle Accelerator Conference, New Orleans, Louisiana, 05/20-05/25/2012
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Dooling, J. C., Lindberg, R. R., Wang, C.-X., Sereno, N., and Lumpkin, A. H. Beam Characterization and Coherent Optical Transition Radiation Studies at the Advanced Photon Source Linac. United States: N. p., 2012.
Web.
Dooling, J. C., Lindberg, R. R., Wang, C.-X., Sereno, N., & Lumpkin, A. H. Beam Characterization and Coherent Optical Transition Radiation Studies at the Advanced Photon Source Linac. United States.
Dooling, J. C., Lindberg, R. R., Wang, C.-X., Sereno, N., and Lumpkin, A. H. 2012.
"Beam Characterization and Coherent Optical Transition Radiation Studies at the Advanced Photon Source Linac". United States. https://www.osti.gov/servlets/purl/1406547.
@article{osti_1406547,
title = {Beam Characterization and Coherent Optical Transition Radiation Studies at the Advanced Photon Source Linac},
author = {Dooling, J. C. and Lindberg, R. R. and Wang, C.-X. and Sereno, N. and Lumpkin, A. H.},
abstractNote = {The Advanced Photon Source facility includes a 450-MeV S-band linac with the option for injection from a photocathode (PC) rf gun. A diode-pumped, twice-frequency doubled Nd:glass regen laser (263 nm) is used with the Cu PC to generate the ele ctron beams. Characterization of these beams and studies of the microbunching instability following beam compression in the four-dipole magnetic chicane are described. A suite of diagnostics is employed including a three-screen emittance section, a FIR co herent transition radiation autocorrelator, electron spectrometers, and an optical diagnostics end station. An energy chirp impressed on the beam is used to compress the 1-2 ps, rms bunch as it passes through the chicane. With compression, bunch lengths o f 170-200 fs, rms at 450 pC are measured, and coherent optical transition radiation (COTR) due to the microbunching instability is observed. Mitigation techniques of the COTR in the beam profile diagnostics are demonstrated both spectrally and temporally. At 100 pC without compression normalized transverse emittances of 1.8 and 2.7 microns are observed in the x and y planes, in reasonable agreement with initial ASTRA simulations.},
doi = {},
url = {https://www.osti.gov/biblio/1406547},
journal = {Conf.Proc.},
number = ,
volume = C1205201,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2012},
month = {Tue May 01 00:00:00 EDT 2012}
}