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Single shot cathode transverse momentum imaging in high brightness photoinjectors

Journal Article · · Physical Review Accelerators and Beams
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  1. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany); Tsinghua Univ., Beijing (China)
  2. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Tsinghua Univ., Beijing (China)
  5. Shanghai Tech Univ., Shanghai (China)
+ Show Author Affiliations
In state of the art photoinjector electron sources, thermal emittance from photoemission dominates the final injector emittance. Therefore, low thermal emittance cathode developments and diagnostics are very important. Conventional thermal emittance measurements for the high gradient gun are time-consuming and thus thermal emittance is not measured as frequently as quantum efficiency during the lifetime of photocathodes, although both are important properties for the photoinjector optimizations. In this paper, a single shot measurement of photoemission transverse momentum, i.e., thermal emittance per rms laser spot size, is proposed for photocathode rf guns. By tuning the gun solenoid focusing, the electrons’ transverse momenta at the cathode are imaged to a downstream screen, which enables a single shot measurement of both the rms value and the detailed spectra of the photoelectrons’ transverse momenta. Both simulations and proof of principle experiments are reported.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1604741
Journal Information:
Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Journal Issue: 4 Vol. 23; ISSN 2469-9888
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (22)

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journal November 2018
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