Commissioning of JAERI energy recovery linac

Nishimori, Nobuyuki; Hajima, Ryoichi; Nagai, Ryoji; Sawamura, Masaru; Kikuzawa, Nobuhiro ; Shizuma, Toshiyuki; Minehara, Eisuke

The energy recovery linac with superconducting accelerator was constructed in JAERI (Japan Atomic Energy Research Institute) FEL, and the commissioning started in December 2001. The electron beam is injected into the energy recovery system at 2 MeV, accelerated up to 17 MeV and damped after deceleration down to 2 MeV by the same accelerator. The bunch charge of the electron beam is 0.5 nC with micro-pulse repetition rate of 10 MHz. The energy recovery rate was estimated to be more than 95 % from an RF input power with and without energy recovery. In this paper, we show the present results of energy-recovery experiments.