The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Souda, H. AU - Fujimoto, T. AU - Kanai, T. AU - Kikuchi, K. AU - Kubota, Y. AU - Matsumura, A. AU - Shimada, H. AU - Takeshita, E. AU - Tashiro, M. AU - Torikai, K. AU - Torikoshi, M. AU - Yamada, S. AU - Yusa, K. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Improvement of Scanning Irradiation in Gunma University Heavy Ion Medical Center J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - Gunma University Heavy Ion Medical Center (GHMC) is a compact heavy ion treatment facility* and have experienced 5 years of successful treatment operation. GHMC has 3 treatment room using broad beam (wobbling) irradiation system and 1 experimental irradiation room for the research and development of a spot-scanning irradiation. During the study toward the treatment, several improvements were done in both accelerator and irradiation system. For accelerators, slow extraction from a synchrotron using a transverse rf field is tested**. Compared with conventional extraction system of rf acceleration, ripples of the beam spill (peak to bottom ratio) is reduced from almost 100% to 60%; the deviation of the beam center position and the deviation of the beam size (1σ) are reduced to the order of 0.1 mm. For irradiation system, regularly operation for biological experiments has started form June 2014. In order to shorten the experiment time, 2-dimensional optimization of the irradiation planning was carried out. After the optimization, the irradiation time was reduced by 30% with keeping the dose uniformity within ±2.5%. PB - JACoW CP - Geneva, Switzerland SP - 1914 EP - 1916 KW - extraction KW - ion KW - heavy-ion KW - acceleration KW - experiment DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-TUPOY006 UR - http://jacow.org/ipac2016/papers/tupoy006.pdf ER -