Presentation Performance of the HIMAC beam control system using multiple-energy synchrotron operation

Mizushima, Kota  ,  Furukawa, Takuji  ,  Iwata, Yoshiyuki  ,  Hara, Yousuke  ,  Saotome, Naoya  ,  Saraya, Yuichi  ,  Tansho, Ryohei  ,  Sato, Shinji  ,  Shirai, Toshiyuki  ,  Noda, Koji

The National Institute of Radiological Sciences (NIRS) has performed carbon-ion radiotherapy on more than 9000 patients since 1994 and began the treatment with pencil beam scanning from 2011. Multiple-energy synchrotron operation was developed to realize fast 3D scanning irradiation at the Heavy Ion Medical Accelerator in Chia (HIMAC) in NIRS. It can provide carbon-ion beams with various energies ranging from 48 to 430 MeV/n in a single synchrotron cycle. To make use of its advantage, a fast beam chopper system has been installed in the high-energy beam transport (HEBT). This system is used to prevent uncontrollable spilled beams, which is caused by varying the beam energy, being delivered to the irradiation port. The changes of the beam energy can be performed quickly and reliably by using the HEBT chopper system. In addition, the intensity control system of the extracted beam has been equipped to save the irradiation time. It can lead a fast scanning sequence by keeping the beam intensity high within the limits determined by the performance of the magnet power supplies and so on. The irradiation tests were carried out to verify the performance of the beam control system using multiple-energy operation. The system could output the beams of more than 140 different energies in 60 seconds. The output beam intensity could be controlled for their energies without large ripple and overshoot. Experimental irradiation for prostate cancer treatment was also successfully performed, and its result proved that our system can greatly reduce the irradiation time.
The 12th European Conference on Accelerators in Applied Research and Technology (ECAART12)

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