Multiple-energy operation with extended flattops at HIMAC

作者：Iwata Y^*; Kadowaki T; Uchiyama H; Fujimoto T; Takada E; Shirai T; Furukawa T; Mizushima K; Takeshita E; Katagiri K; Sato S; Sano Y; Noda K

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2010, 624(1): 33-38.

DOI：10.1016/j.nima.2010.09.016

• Heavy ion cancer therapy
• Medical accelerators
• Synchrotron operation
• Scanning irradiation

Multiple-energy operation with extended flattops for synchrotron accelerators is being developed at 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 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 the depth dose-distribution By applying this multiple-energy operation to our fast raster-scanning irradiation we can considerably reduce the total irradiation time and concurrently obtain excellent depth dose-distributions Beam acceleration and extraction tests using

• 出版日期2010-12-1