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Title: Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets

Abstract

We report initial observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched electrons from laser-driven plasma accelerators (LPAs). These are revealed in the angular distribution patterns obtained by a CCD camera with the optics focused at infinity, or the far-field, viewing a Wartski two-foil interferometer. The beam divergences deduced by comparison to results from an analytical model are sub-mrad, and they are smaller than the ensemble vertical beam divergences measured at the downstream screen of the electron spectrometer. The transverse sizes of the beamlet images were obtained with focus at the object, or near field, and were in the few-micron regime as reported by LaBerge et al. [8]. The enhancements in intensity are significant relative to incoherent optical transition radiation (OTR) enabling multiple cameras to view each shot. We present two-foil interferometry effects coherently enhanced in both the 100-TW LPA at 215 MeV energy at Helmholtz-Zentrum Dresden-Rossendorf and the PW LPA at 1.0-GeV energy at the University of Texas-Austin. A transverse emittance estimate is reported for a microbunched beamlet example generated within the plasma bubble.

Authors:
 [1];  [2];  [3];  [2];  [2];  [4];  [2];  [4];  [4];  [4];  [4];  [4]
  1. Fermilab
  2. Texas U.
  3. Silver Spring
  4. HZDR, Dresden
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1487396
Report Number(s):
FERMILAB-CONF-18-511-AD
1709257
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 18th Advanced Accelerator Concepts Workshop, Breckenridge, CO, US, 08/12-08/17/2018
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Lumpkin, A. H., LaBerge, Maxwell, Rule, Donald, Hannasch, Andrea, Downer, Michael, Zarini, Omid, Bowers, Brant, Irman, Arie, Couperus, Jurgen, Debus, Alexander, Kohler, Alexander, and Schramm, Ulrich. Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets. United States: N. p., 2018. Web.
Lumpkin, A. H., LaBerge, Maxwell, Rule, Donald, Hannasch, Andrea, Downer, Michael, Zarini, Omid, Bowers, Brant, Irman, Arie, Couperus, Jurgen, Debus, Alexander, Kohler, Alexander, & Schramm, Ulrich. Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets. United States.
Lumpkin, A. H., LaBerge, Maxwell, Rule, Donald, Hannasch, Andrea, Downer, Michael, Zarini, Omid, Bowers, Brant, Irman, Arie, Couperus, Jurgen, Debus, Alexander, Kohler, Alexander, and Schramm, Ulrich. Thu . "Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets". United States. https://www.osti.gov/servlets/purl/1487396.
@article{osti_1487396,
title = {Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets},
author = {Lumpkin, A. H. and LaBerge, Maxwell and Rule, Donald and Hannasch, Andrea and Downer, Michael and Zarini, Omid and Bowers, Brant and Irman, Arie and Couperus, Jurgen and Debus, Alexander and Kohler, Alexander and Schramm, Ulrich},
abstractNote = {We report initial observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched electrons from laser-driven plasma accelerators (LPAs). These are revealed in the angular distribution patterns obtained by a CCD camera with the optics focused at infinity, or the far-field, viewing a Wartski two-foil interferometer. The beam divergences deduced by comparison to results from an analytical model are sub-mrad, and they are smaller than the ensemble vertical beam divergences measured at the downstream screen of the electron spectrometer. The transverse sizes of the beamlet images were obtained with focus at the object, or near field, and were in the few-micron regime as reported by LaBerge et al. [8]. The enhancements in intensity are significant relative to incoherent optical transition radiation (OTR) enabling multiple cameras to view each shot. We present two-foil interferometry effects coherently enhanced in both the 100-TW LPA at 215 MeV energy at Helmholtz-Zentrum Dresden-Rossendorf and the PW LPA at 1.0-GeV energy at the University of Texas-Austin. A transverse emittance estimate is reported for a microbunched beamlet example generated within the plasma bubble.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {9}
}

Conference:
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