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Journal of the Korean Physical Society

, Volume 74, Issue 1, pp 24–29 | Cite as

Performance of an Indium-sealed S-band RF Photoelectron Gun for Time-resolved Electron Diffraction Experiments

  • Hyun Woo Kim
  • Kyu-Ha Jang
  • In Hyung Baek
  • Kitae Lee
  • Young Uk Jeong
  • Jinhee Nam
  • Moonsik Chae
  • Mi Hye Kim
  • Young Chan Kim
  • Key Young Oang
  • Sunjeong Park
  • Jang-Hui Han
  • Nikolay A. Vinokurov
Article
  • 1 Downloads

Abstract

We have developed a one-and-half -cell S-band radio-frequency (RF) photoelectron gun (photogun) fed by a coaxial coupler. The RF photogun is dedicated to ultrafast-electron-diffraction experiments by generating electron bunches of 3-MeV energy and a-few-pC charge, which is not strict condition compared to those for X-ray free-electron lasers. Brazing of RF cavities is welldeveloped process for making RF guns or RF accelerators. Sometimes, however, a failure occurs in the brazing process, causing the entire electron gun or accelerating cavity to spoil. Axial-symmetric design of the RF photogun permits indium sealing for cavity cells, a photocathode plate, and a coupling RF part. We firstly report that the indium-sealed RF photogun successfully meets the required performance and long-term stability for ultrafast electron diffraction experiments. We have stably operated the RF photogun for more than three years with the electron beam conditions of ~ 3-MeV energy, up-to-10-pC charge, and a repetition rate of 50 Hz. The quantum efficiency of the copper photocathode had improved from 10−6 to 10−5 depending on vacuum condition from 10−8 to 5 × 10−10 Torr, respectively. Measured emittance and energy spread of the generated electron beam showed 0.3 mm-mrad and less than 0.25%, respectively, for a bunch charge of ~ 2 pC, which agree well with those obtained by ASTRA simulation.

Keywords

Radio-frequency gun Photoelectron gun Time-resolved electron diffraction Ultrafast electron diffraction Ultrafast science 

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Copyright information

© The Korean Physical Society 2019

Authors and Affiliations

  • Hyun Woo Kim
    • 1
    • 2
  • Kyu-Ha Jang
    • 1
    • 2
  • In Hyung Baek
    • 1
    • 2
  • Kitae Lee
    • 1
    • 2
  • Young Uk Jeong
    • 1
    • 2
  • Jinhee Nam
    • 1
  • Moonsik Chae
    • 2
  • Mi Hye Kim
    • 2
  • Young Chan Kim
    • 2
  • Key Young Oang
    • 2
  • Sunjeong Park
    • 3
  • Jang-Hui Han
    • 4
  • Nikolay A. Vinokurov
    • 5
  1. 1.University of Science and TechnologyDaejeonKorea
  2. 2.Radiation Center for Ultrafast Science, Korea Atomic Energy Research InstituteDaejeonKorea
  3. 3.Korea UniversitySejongKorea
  4. 4.Pohang Accelerator Laboratory, POSTECHPohangKorea
  5. 5.Budker Institute of Nuclear PhysicsNovosibirskRussia

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