Status of center for accelerator and beam applied science of Kyushu University

A new accelerator facility of Center for Accelerator and Beam Applied Science is under construction on Ito Campus to promote research and education activities at Kyushu University. The facility consists mainly of a 10 MeV proton cyclotron as an injector and a 150 MeV Fixed Field Alternating Gradient (FFAG) accelerator, which was developed at KEK as a prototype of proton FFAG for various applications. In this paper, the status of the development of devices and the facility is described. INTRODUCTION Center for Accelerator and Beam Applied Science has been established in April 2007 to promote activities in all the related scientific, medical, engineering and educational fields at Kyushu University. To realize the purpose of the center, Kyushu University has decided to construct a new facility merging three institutes that are Cockcroft-Walton Accelerator Laboratory of Faculty of Engineering, Institute for Irradiation and Analysis of Quantum Radiations and Kyushu University Tandem Accelerator Laboratory of Faculty of Sciences, on its new campus (Ito Campus). The facility mainly consists of a 10 MeV injector cyclotron and a 150 MeV Fixed Field Alternating Gradient (FFAG) accelerator [1-7] as a replacement of the Cockcroft-Walton accelerator. The 150 MeV FFAG, a prototype machine to prove its usefulness for various applications such as proton beam therapy, was developed at KEK. The construction of the 150 MeV FFAG was started in September 2002 at the east counter hall in KEK, and the beam extraction with 100 Hz operation was successfully demonstrated in November 2005. The 150 MeV FFAG, disassembled in June 2006, was transported by land from KEK to Ito Campus in March 2008. The construction of the first stage building of the facility has already been completed. The development of the 150 MeV FFAG, the beam commissioning, the pilot researches on nuclear, medical and life science will be carried out from 2009 to 2013. In this stage, we are also planning to introduce a high intensity proton injector for the FFAG. In the second stage, from 2014 to 2016, experimental halls will be extended, and a new tandem accelerator for AMS and heavy-ion beam injection to the FFAG will be installed into the facility. OVER VIEW OF 150 MEV FFAG Details of devices of the 150 MeV FFAG are described in this section. The main parameters of the 150 MeV FFAG are summarized in Table 1. Figure 1 shows the schematic layout of the accelerator. Table 1: Designed parameters of 150 MeV FFAG Energy 10 125 MeV(proton) Type of magnet Triplet radial ( DFD)