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Construction and commissioning of the compact energy-recovery linac at KEK

2017; Elsevier BV; Volume: 877; Linguagem: Inglês

10.1016/j.nima.2017.08.051

1872-9576

M. Akemoto, Dai Arakawa, Seiji Asaoka, Enrico Cenni, Masato Egi, Kazuhiro Enami, K. Endo, Shigeki Fukuda, T. Furuya, K. Haga, Ryoichi Hajima, Kazufumi Hara, Kentaro Harada, Tohru Honda, Y. Honda, T. Honma, K. Hosoyama, E. Kako, Hiroaki Katagiri, Hiroshi Kawata, Yukinori Kobayashi, Yuuji Kojima, Yoshinari Kondou, Olga Tanaka, Tatsuya Kume, M. Kuriki, Hiroshi Matsumura, Hideki Matsushita, Shinichiro Michizono, Takako Miura, Tsukasa Miyajima, Shinya Nagahashi, Ryoji Nagai, H. Nakai, Hiromitsu Nakajima, Norio Nakamura, Kota Nakanishi, Kazuyuki Nigorikawa, N. Nishimori, Takashi Nogami, S. Noguchi, T. Obina, Feng Qiu, Hidenori Sagehashi, Hiroshi Sakai, S. Sakanaka, Shin‐ichi Sasaki, K. Satoh, M. Sawamura, Miho Shimada, Kenji Shinoe, T. Shishido, M. Tadano, Takeshi Takahashi, Ryota Takai, T. Takenaka, Yasunori Tanimoto, Takashi Uchiyama, Akira Ueda, Kensei Umemori, Ken Watanabe, Masahiro Yamamoto,

Gyrotron and Vacuum Electronics Research

Energy-recovery linacs (ERLs) are promising for advanced synchrotron light sources, high-power free electron lasers (FELs), high-brightness gamma-ray sources, and electron–ion colliders. To demonstrate the critical technology of ERL-based light sources, we have designed and constructed a test accelerator, the compact ERL (cERL). Using advanced technology that includes a photocathode direct current (DC) electron gun and two types of 1.3-GHz-frequency superconducting cavities, the cERL was designed to be capable of recirculating low emittance (≤1 mm⋅ mrad) and high average-current (≥10 mA) electron beams while recovering the beam energy. During initial commissioning, the cERL demonstrated successful recirculation of high-quality beams with normalized transverse emittance of ∼0.14 mm⋅ mrad and momentum spread of ∼1.2 × 10−4 (rms) at a beam energy of 20 MeV and bunch charge below 100 fC. Energy recovery in the superconducting main linac was also demonstrated for high-average-current continuous-wave beams. These results constitute an important milestone toward realizing ERL-based light sources.