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Title: Operational experience with nanocoulomb bunch charges in the Cornell photoinjector

Abstract

Characterization of 9–9.5 MeV electron beams produced in the dc-gun based Cornell photoinjector is given for bunch charges ranging from 20 pC to 2 nC. Comparison of the measured emittances and longitudinal current profiles to optimized 3D space charge simulations yields excellent agreement for bunch charges up to 1 nC when the measured laser distribution is used to generate initial particle distributions in simulation. Analysis of the scaling of the measured emittance with bunch charge shows that the emittance scales roughly as the square root of the bunch charge up to 300 pC, above which the trend becomes linear. Furthermore, these measurements demonstrate that the Cornell photoinjector can produce cathode emittance dominated beams meeting the emittance and peak current specifications for next generation free electron lasers operating at high repetition rate. In addition, the 1 and 2 nC results are relevant to the electron ion collider community.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1212224
Alternate Identifier(s):
OSTI ID: 1454553
Grant/Contract Number:  
AC02-76SF00515; SC0012493
Resource Type:
Published Article
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Special Topics. Accelerators and Beams Journal Volume: 18 Journal Issue: 8; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Bartnik, Adam, Gulliford, Colwyn, Bazarov, Ivan, Cultera, Luca, and Dunham, Bruce. Operational experience with nanocoulomb bunch charges in the Cornell photoinjector. United States: N. p., 2015. Web. doi:10.1103/PhysRevSTAB.18.083401.
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Bartnik, Adam, Gulliford, Colwyn, Bazarov, Ivan, Cultera, Luca, & Dunham, Bruce. Operational experience with nanocoulomb bunch charges in the Cornell photoinjector. United States. https://doi.org/10.1103/PhysRevSTAB.18.083401
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Bartnik, Adam, Gulliford, Colwyn, Bazarov, Ivan, Cultera, Luca, and Dunham, Bruce. Wed . "Operational experience with nanocoulomb bunch charges in the Cornell photoinjector". United States. https://doi.org/10.1103/PhysRevSTAB.18.083401.
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@article{osti_1212224,
title = {Operational experience with nanocoulomb bunch charges in the Cornell photoinjector},
author = {Bartnik, Adam and Gulliford, Colwyn and Bazarov, Ivan and Cultera, Luca and Dunham, Bruce},
abstractNote = {Characterization of 9–9.5 MeV electron beams produced in the dc-gun based Cornell photoinjector is given for bunch charges ranging from 20 pC to 2 nC. Comparison of the measured emittances and longitudinal current profiles to optimized 3D space charge simulations yields excellent agreement for bunch charges up to 1 nC when the measured laser distribution is used to generate initial particle distributions in simulation. Analysis of the scaling of the measured emittance with bunch charge shows that the emittance scales roughly as the square root of the bunch charge up to 300 pC, above which the trend becomes linear. Furthermore, these measurements demonstrate that the Cornell photoinjector can produce cathode emittance dominated beams meeting the emittance and peak current specifications for next generation free electron lasers operating at high repetition rate. In addition, the 1 and 2 nC results are relevant to the electron ion collider community.},
doi = {10.1103/PhysRevSTAB.18.083401},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 8,
volume = 18,
place = {United States},
year = {Wed Aug 19 00:00:00 EDT 2015},
month = {Wed Aug 19 00:00:00 EDT 2015}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevSTAB.18.083401
Copyright Statement
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Citation Metrics:
Cited by: 38 works
Citation information provided by
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Figures / Tables:

FIG. 1 FIG. 1: Top view of the Cornell injector. The deflecting cavity (not shown) is located between the second EMS slit pair and the A4 Faraday cup.
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Works referenced in this record:

Demonstration of cathode emittance dominated high bunch charge beams in a DC gun-based photoinjector
journal, March 2015

  • Gulliford, Colwyn; Bartnik, Adam; Bazarov, Ivan
  • Applied Physics Letters, Vol. 106, Issue 9
  • DOI: 10.1063/1.4913678

Record high-average current from a high-brightness photoinjector
journal, January 2013

  • Dunham, Bruce; Barley, John; Bartnik, Adam
  • Applied Physics Letters, Vol. 102, Issue 3
  • DOI: 10.1063/1.4789395

High-power fiber lasers for photocathode electron injectors
journal, May 2014

  • Zhao, Zhi; Bartnik, Adam; Wise, Frank W.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 17, Issue 5
  • DOI: 10.1103/PhysRevSTAB.17.053501

Demonstration of low emittance in the Cornell energy recovery linac injector prototype
journal, July 2013

  • Gulliford, Colwyn; Bartnik, Adam; Bazarov, Ivan
  • Physical Review Special Topics - Accelerators and Beams, Vol. 16, Issue 7
  • DOI: 10.1103/PhysRevSTAB.16.073401

Benchmarking of 3D space charge codes using direct phase space measurements from photoemission high voltage dc gun
journal, October 2008

  • Bazarov, Ivan V.; Dunham, Bruce M.; Gulliford, Colwyn
  • Physical Review Special Topics - Accelerators and Beams, Vol. 11, Issue 10
  • DOI: 10.1103/PhysRevSTAB.11.100703

Growth and characterization of rugged sodium potassium antimonide photocathodes for high brilliance photoinjector
journal, September 2013

  • Cultrera, L.; Karkare, S.; Lillard, B.
  • Applied Physics Letters, Vol. 103, Issue 10
  • DOI: 10.1063/1.4820132

Generation of 150  W average and 1  MW peak power picosecond pulses from a rod-type fiber master oscillator power amplifier
journal, December 2013

  • Zhao, Zhi; Dunham, Bruce M.; Wise, Frank W.
  • Journal of the Optical Society of America B, Vol. 31, Issue 1
  • DOI: 10.1364/JOSAB.31.000033
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    Figures / Tables found in this record:

    FIG. 1 (p. 2)figure
    FIG. 2 (p. 3)figure
    TABLE I (p. 3)table
    FIG. 3 (p. 4)figure
    FIG. 4 (p. 4)figure
    FIG. 5 (p. 5)figure
    FIG. 6 (p. 5)figure
    FIG. 7 (p. 6)figure
    TABLE II (p. 6)table
    TABLE III (p. 6)table
    FIG. 10 (p. 7)figure
    FIG. 8 (p. 7)figure
    FIG. 9 (p. 7)figure
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