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

Journal Article · · Physical Review Special Topics. Accelerators and Beams
; ; ; ;

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.

Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-76SF00515; SC0012493
OSTI ID:
1212224
Alternate ID(s):
OSTI ID: 1454553
Journal Information:
Physical Review Special Topics. Accelerators and Beams, Journal Name: Physical Review Special Topics. Accelerators and Beams Vol. 18 Journal Issue: 8; ISSN 1098-4402
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

References (7)

Demonstration of cathode emittance dominated high bunch charge beams in a DC gun-based photoinjector journal March 2015
Record high-average current from a high-brightness photoinjector journal January 2013
High-power fiber lasers for photocathode electron injectors journal May 2014
Demonstration of low emittance in the Cornell energy recovery linac injector prototype journal July 2013
Benchmarking of 3D space charge codes using direct phase space measurements from photoemission high voltage dc gun journal October 2008
Growth and characterization of rugged sodium potassium antimonide photocathodes for high brilliance photoinjector journal September 2013
Generation of 150  W average and 1  MW peak power picosecond pulses from a rod-type fiber master oscillator power amplifier journal December 2013

Figures / Tables (13)

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

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