@article{oai:repo.qst.go.jp:00047635,
 author = {岩田, 佳之 and 藤本哲也 and 松葉, 俊哉 and 藤田, 敬 and 佐藤, 眞二 and 古川, 卓司 and 原, 洋介 and 水島, 康太 and 皿谷, 有一 and 丹正, 亮平 and 早乙女, 直也 and 白井, 敏之 and 野田, 耕司 and 岩田 佳之 and 松葉 俊哉 and 藤田 敬 and 佐藤 眞二 and 古川 卓司 and 原 洋介 and 水島 康太 and 皿谷 有一 and 丹正 亮平 and 早乙女 直也 and 白井 敏之 and 野田 耕司},
 journal = {Nuclear Instruments and Methods in Physics Research A},
 month = {Oct},
 note = {A superconducting rotating-gantry for carbon-ion radiotherapy was developed. This isocentric gantry can transport carbon ions having kinetic energies of between E=430-48 MeV/u to an isocenter over an angle of ±180 degrees, and is further capable of performing three-dimensional raster-scanning irradiation. Construction of the entire rotating-gantry system was completed by the end of September 2015. Prior to beam commissioning, phase-space distributions of extracted carbon beams from the synchrotron were deduced by using an empirical method. In this method, phase-space distributions at the extraction channel of the synchrotron were modeled with 8 parameters, and the best parameters were determined so as to minimize a difference between the calculated and measured beam profiles by using a simplex method. Based on the phase-space distributions, beam optics through the beam-transport lines as well as the rotating gantry were designed. Since horizontal and vertical beam emittances, as extracted slowly from the synchrotron, generally differ with each other, a horizontal-vertical beam coupling would occur when the gantry rotates. Thus, the size and shape of beam spots at the isocenter should vary depending on the gantry angle. To compensate for the difference in the emittances, we employed a method to utilize multiple Coulomb scattering of the beam particles by a thin scatterer. Having compensated for the emittances and designed beam optics through the rotating gantry, beam commissioning over various combinations of gantry angles and beam energies was performed. By finely tuning the superconducting quadrupoles of the rotating gantry, we could successfully obtain the designed beam quality, which satisfies the requirements of scanning irradiation.},
 pages = {71--80},
 title = {Beam commissioning of a superconducting rotating-gantry for carbon-ion radiotherapy},
 volume = {834},
 year = {2016}
}