JAEA photocathode DC-gun for an ERL injector

T. Nishitani, R. Hajima, H. Iijima, R. Nagai, M. Sawamura, N. Kikuzawa, N. Nishimori, E. Minehara, M. Tabuchi, Y. Noritake, H. Hayashitani, Y. Takeda

Research output: Contribution to conferencePaperpeer-review

6 Citations (Scopus)


An ERL-based next-generation synchrotron light source and free electron laser require an electron beam of large current and small emittance. In order to realize an electron gun satisfying such requirements, we are developing an NEA-GaAs photocathode DC-gun. The gun is based on an existing DC-gun of Japan Atomic Energy Agency (JAEA) ERL-FEL and designed to provide a beam with energy of 250 keV and average current of 50 mA. Conditioning of a high voltage power supply has been completed up to design the target voltage of 250 kV. We have also decided to use superlattice semiconductor as a new type of photocathode with higher performance than an existing technology. We fabricated bulk-AlGaAs photocathode samples by molecular beam epitaxy in order to optimize the superlattice structure. We measured quantum efficiency and lifetime of the samples and achieved twice QE of a bulk-GaAs photocathode and longer NEA surface life than that of the bulk-GaAs photocathode.

Original languageEnglish
Number of pages4
Publication statusPublished - 2006
Externally publishedYes
Event28th International Free Electron Laser Conference, FEL 2006 - Berlin, Germany
Duration: 2006 Aug 272006 Sep 1


Other28th International Free Electron Laser Conference, FEL 2006

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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