Generation of a 500-keV electron beam from a high voltage photoemission gun

Nobuyuki Nishimori, Ryoji Nagai, Shunya Matsuba, Ryoichi Hajima, Masahiro Yamamoto, Tsukasa Miyajima, Yosuke Honda, Hokuto Iijima, Masao Kuriki, Makoto Kuwahara

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)


    High-brightness, high-current electron guns for energy recovery linac light sources and high repetition rate X-ray free-electron lasers require an exit beam energy of ≥ 500 keV to reduce space-charge induced emittance growth in the drift space from the gun exit to the following superconducting accelerator entrance. At the Japan Atomic Energy Agency, we have developed a DC photoemission gun employing a segmented insulator to mitigate the field emission problem, which is a major obstacle for operation of DC guns at ≥ 500 kV. The first demonstration of generating a 500-keV electron beam with currents up to 1.8 mA is presented.

    Original languageEnglish
    Article number234103
    JournalApplied Physics Letters
    Issue number23
    Publication statusPublished - 2013 Jun 10

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)


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