• S. Kashiwagi, K. Furuhashi, G. Isoyama, R. Kato, M. Morio, N. Sugimoto, Y. Terasawa
  ISIR, Osaka
• H. Hayano, H. Sugiyama, J. Urakawa, K. Watanabe
  KEK, Ibaraki
• D. Kubo, M. Kuriki, C. Shonaka
  HU/AdSM, Higashi-Hiroshima

We have begun the development of L-band photocathode RF gun for the 40 MeV L-band linac at ISIR, Osaka University to advance studies such as FEL and pulse radiolysis experiments in the future with the high-intensity and low emittance electron beam. Before it installs the RF gun into Osaka University, we plan to develop and commission the L-band RF electron gun for the Superconducting RF Test Facility (STF) at High Energy Accelerator Research Organization (KEK). While waiting for delivery of an RF cavity and an input coupler from the Fermi National Accelerator Laboratory, we have fabricated a test RF gun cavity and a coaxial input coupler made from Aluminium and investigated the rf properties of them. The resonant frequency and field balance of the real RF gun cavity have been adjusted using a tuning apparatus at KEK-STF. Some results of the development are reported, including the tuning of RF characteristics of the cavity, design of an input coupler and solenoid magnet for emittance compensation, and computer simulation for characteristics of the accelerated electron beam.