Beam test of a new radio frequency quadrupole linac for the Japan Proton Accelerator Research Complex

• Main Authors: Yasuhiro Kondo, Takatoshi Morishita, Saisyun Yamazaki, Toshihiko Hori, Yuki Sawabe, Etsuji Chishiro, Shinpei Fukuta, Kazuo Hasegawa, Koichiro Hirano, Nobuhiro Kikuzawa, Isao Koizumi, Akihiko Miura, Hidetomo Oguri, Kiyonori Ohkoshi, Fumiaki Sato, Shinichi Shinozaki, Akira Ueno, Hiroshi Kawamata, Takashi Sugimura, Akira Takagi, Zhigao Fang, Yuji Fukui, Kenta Futatsukawa, Kiyoshi Ikegami, Tomofumi Maruta, Tomoaki Miyao, Kesao Nanmo
• Format: Article
• Language: English
• Published: American Physical Society 2014-12-01
• Series: Physical Review Special Topics. Accelerators and Beams
• Online Access: http://doi.org/10.1103/PhysRevSTAB.17.120101

We performed a beam test of a new radio frequency quadrupole linac (RFQ III) for the beam current upgrade of the Japan Proton Accelerator Research Complex. First, the conditioning of RFQ III was conducted, and after 20 h of conditioning, RFQ III became very stable with a nominal peak power and duty factor of 400 kW and 1.5%, respectively. An off-line beam test was subsequently conducted before installation in the accelerator tunnel. The transmission, transverse emittance, and energy spread of the 50-mA negative hydrogen beam from RFQ III were measured and compared with simulation results. The experiment and simulation results showed good agreement; therefore, we conclude that the performance of RFQ III conforms to its design.