• T. Miyajima, K. Haga, K. Harada, T. Honda, Y. Honda, Y. Kobayashi, T.M. Mitsuhashi, S. Nagahashi, E. Nakamura, S. Nozawa, T. Ozaki, S. Sakanaka, K. Satoh, M. Shimada, T. Takahashi, R. Takai, M. Tobiyama, T. Uchiyama, A. Ueda, M. Yamamoto
  KEK, Ibaraki
• S. Matsuba
  Hiroshima University, Graduate School of Science, Higashi-Hiroshima
• T. Muto
  Tohoku University, School of Scinece, Sendai

Com­pact ERL (cERL) is a test ac­cel­er­a­tor to es­tab­lish ac­cel­er­a­tor tech­nolo­gies for GeV-class syn­chrotron light source based on ERL (En­er­gy Re­cov­ery Linac), and will be con­struct­ed in KEK. It con­sists of an in­jec­tor with photo cath­ode 500 kV DC gun, a merg­er sec­tion, super con­duct­ing RF cav­i­ties for ac­cel­er­a­tion and en­er­gy re­cov­ery, re­turn loops, and a beam dump. To op­er­ate and test the photo cath­ode gun be­fore in­stalling it in the cERL in­jec­tor, Gun Test Fa­cil­i­ty is con­struct­ing in KEK, AR south ex­per­i­men­tal hall. The Gun Test Fa­cil­i­ty has two photo cath­ode guns, 200 kV gun de­vel­oped by Nagoya Uni­ver­si­ty and new 500 kV gun which is being de­vel­oped, laser sys­tem to be emit­ted elec­trons from photo cath­ode sur­face, beam trans­port lines, and a beam di­ag­nos­tics sys­tem. The di­ag­nos­tics sys­tem con­sists of a dou­ble slit emit­tance mea­sure­ment sys­tem, beam po­si­tion mon­i­tors, trans­verse pro­file mon­i­tors, and a de­flect­ing cav­i­ty to mea­sure the bunch length and the lon­gi­tu­di­nal pro­file. In this pre­sen­ta­tion, the progress in the con­struc­tion of the Gun Test Fa­cil­i­ty and the beam dy­nam­ics sim­u­la­tion will be pre­sent­ed.

• S. Sakanaka, M. Akemoto, T. Aoto, D.A. Arakawa, S. Asaoka, A. Enomoto, S. Fukuda, K. Furukawa, T. Furuya, K. Haga, K. Hara, K. Harada, T. Honda, Y. Honda, H. Honma, T. Honma, K. Hosoyama, M. Isawa, E. Kako, T. Kasuga, H. Katagiri, H. Kawata, Y. Kobayashi, Y. Kojima, T. Matsumoto, H. Matsushita, S. Michizono, T.M. Mitsuhashi, T. Miura, T. Miyajima, H. Miyauchi, S. Nagahashi, H. Nakai, H. Nakajima, E. Nakamura, K. Nakanishi, K. Nakao, T. Nogami, S. Noguchi, S. Nozawa, T. Obina, S. Ohsawa, T. Ozaki, C.O. Pak, H. Sakai, H. Sasaki, Y. Sato, K. Satoh, M. Satoh, T. Shidara, M. Shimada, T. Shioya, T. Shishido, T. Suwada, M. Tadano, T. Takahashi, R. Takai, T. Takenaka, Y. Tanimoto, M. Tobiyama, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, K. Watanabe, M. Yamamoto, S. Yamamoto, Y. Yamamoto, Y. Yano, M. Yoshida
  KEK, Ibaraki
• M. Adachi, M. Katoh, H. Zen
  UVSOR, Okazaki
• R. Hajima, R. Nagai, N. Nishimori, M. Sawamura
  JAEA/ERL, Ibaraki
• H. Hanaki
  JASRI/SPring-8, Hyogo-ken
• H. Iijima, M. Kuriki
  HU/AdSM, Higashi-Hiroshima
• I. Ito, H. Kudoh, N. Nakamura, S. Shibuya, K. Shinoe, H. Takaki
  ISSP/SRL, Chiba
• H. Kurisu
  Yamaguchi University, Ube-Shi
• M. Kuwahara, T. Nakanishi, S. Okumi
  Nagoya University, Nagoya
• S. Matsuba
  Hiroshima University, Graduate School of Science, Higashi-Hiroshima
• T. Muto
  Tohoku University, School of Scinece, Sendai
• K. Torizuka, D. Yoshitomi
  AIST, Tsukuba

Fu­ture syn­chrotron light source using a 5-GeV-class en­er­gy re­cov­ery linac (ERL) is under pro­pos­al by our Japanese col­lab­o­ra­tion team, and we are con­duct­ing ac­tive R&D ef­forts for that. We are de­vel­op­ing su­per-bril­liant DC pho­to­cath­ode guns, two types of cry­omod­ules for both in­jec­tor and main su­per­con­duct­ing linacs, 1.3 GHz high CW-pow­er rf sources, and other im­por­tant com­po­nents. We are also con­struct­ing a com­pact ERL for demon­strat­ing the re­cir­cu­la­tion of low-emit­tance, high-cur­rent beams using those key com­po­nents. We pre­sent our re­cent progress in this pro­ject.