@misc{oai:repo.qst.go.jp:00071761,
 author = {Mizushima, Kota and Furukawa, Takuji and Hara, Yousuke and Katagiri, Ken and Iwata, Yoshiyuki and Satou, Shinji and Shirai, Toshiyuki and Noda, Koji and 水島 康太 and 古川 卓司 and 原 洋介 and 片桐 健 and 岩田 佳之 and 佐藤 眞二 and 白井 敏之 and 野田 耕司},
 month = {Jun},
 note = {Purpose: 
For conducting the treatments by scanning irradiation without the use of the energy absorbers, the accelerator system is required to output therapy beams of many different energies. In addition, it is also demanded that the properties, such as spill, position and size, of the beams are reliable for irradiation accuracy.
Methods: 
We have developed a multiple-energy operation method to produce the carbon-ion beams with various energies of more than 200 steps between 56 and 430 MeV/u in a single cycle of the synchrotron. By using this method, the accelerator system can perform a quick change of the output beam energy. To verify that the output beams would meet therapy requirements, we carried out the irradiation experiments at Heavy Ion Medical Accelerator in Chiba (HIMAC).
Results: 
The beam intensity was controlled as required from the irradiation control system, and the beam spill ripple was low in the wide intensity range between 107 and 109 particles per second (pps). The position and size of the beam spot were stable, and their fluctuations were small for all beam energies.
Conclusions: 
The experimental results proved that our system can provide the beams meeting the therapy requirements for all available energies. We will report the performance of our system in our presentation., 53rd Annual Conference of the Particle Therapy Co-Operative Group (PTCOG53)},
 title = {Performance of multiple-energy operation for scanned carbon-ion therapy at HIMAC},
 year = {2014}
}