@article{oai:repo.qst.go.jp:00046272,
 author = {Iwata, Yoshiyuki and Uchiyama, Hiroshi and Fujimoto, Tetsuya and Takada, Eiichi and Shirai, Toshiyuki and Furukawa, Takuji and Mizushima, Kota and Takeshita, Eri and Katagiri, Ken and Satou, Shinji and Noda, Kouji and Kadowaki, Tetsuhito and Sano, Yoshinobu and 岩田 佳之 and 内山 宙志 and 高田 栄一 and 白井 敏之 and 古川 卓司 and 水島 康太 and 竹下 英里 and 片桐 健 and 佐藤 眞二 and 野田 耕司 and 門脇 徹人},
 journal = {Nuclear Instruments & Methods in Physics Research Section A},
 month = {Sep},
 note = {Multiple-energy operation with extended flattops for synchrotron accelerators is developed at the HIMAC.
This operation uses synchrotron operation-patterns having a stepwise flattop.
With these patterns, a beam would be initially accelerated to the maximum energy, and then successively decelerated to the lower energies.
Having extended the flattops and extracted beams during these flattops, heavy ions with various energies can be provided in a single synchrotron cycle. 
Since the extraction energy can be quickly changed by the accelerator itself, no energy degrader will be required to control a depth dose-distribution.
By applying this multiple-energy operation to our fast raster-scanning irradiation, we can considerably reduce total irradiation time and concurrently obtain excellent depth dose-distributions.
Beam acceleration and extraction tests using this operation were made.
Successful results of the tests proved the effectiveness of this multiple-energy operation with extended flattops in the heavy-ion therapy.},
 pages = {33--38},
 title = {Multiple-energy operation with extended flattops at HIMAC},
 volume = {624},
 year = {2010}
}