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TY - CONF AU - Inagaki, T. AU - Asaka, T. AU - Dewa, H. AU - Fukui, T. AU - Hara, T. AU - Hashimoto, S. AU - Hiraiwa, T. AU - Hosoda, N. AU - Inoue, S.I. AU - Iwai, E. AU - Kajimoto, K. AU - Kondo, C. AU - Maesaka, H. AU - Magome, T. AU - Minagawa, Y. AU - Nakata, S. AU - Ohshima, T. AU - Sakurai, T. AU - Seno, T. AU - Sumitomo, H. AU - Takesako, R. AU - Tanaka, H. AU - Tanaka, S. AU - Yamamoto, R. AU - Yanagida, K. AU - Yoshioka, M. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Construction of a Compact Electron Injector Using a Gridded RF Thermionic Gun and a C-Band Accelerator J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - A compact and low-cost 1 GeV injector linac was designed and constructed to provide injection beams to the soft X-ray synchrotron radiation facility NewSUBARU instead of the SPring-8 injector system, which will be shutdown. The total length of the injector linac needs to be less than 70 m to fit into the existing tunnel. To this end, an RF electron gun with a gridded thermionic cathode directly attached to a 238 MHz RF cavity was developed and adopted. The 500 keV, 0.6 ns, 1 nC beam emitted from the cavity is compressed to 3 ps by velocity bunching driven by a 476 MHz RF cavity and a S-band RF structure. The short-pulsed beams are accelerated up to 1 GeV with 16 C-band RF structures. In the C-band accelerator section, the klystron output of 50 MW is multiplied 4 times by a pulse compressor and fed to the 4 RF structures to generate a high accelerating field of 31 MV/m. A low-level RF system consisting of a MTCA.4 based high-speed digitizers and RF frontend boards has been constructed. This injector system is used at the 3 GeV SR facility currently under construction in Sendai. In this paper, we report the design outline and the operational performance of the injector system. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2687 EP - 2689 KW - linac KW - electron KW - injection KW - operation KW - emittance DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-WEPAB039 UR - https://jacow.org/ipac2021/papers/wepab039.pdf ER -