| 摘要 |
PROBLEM TO BE SOLVED: To provide a particle beam irradiation system which maintains an extracted dose of charged particle beams constant.SOLUTION: In the particle beam irradiation system 1A, an accelerator control section 71 and an RF-KO (Radio Frequency-Knock Out) electrode driving device 80A for driving and controlling a synchrotron 40 drive the synchrotron 40 while stopping driving of an RF-KO electrode 45. The accelerator control section and the RF-KO electrode driving device then apply a first RF-KO signal to the RF-KO electrode 45 as RF-KO voltage, and apply the first RF-KO signal and a second RF-KO to the RF-KO electrode 45 signal as RF-KO voltage. The accelerator control section and the RF-KO electrode driving device then start feedback control of the RF-KO voltage on the basis of the dose of charged particle beams extracted from the synchrotron 40. Gain of the feedback control is continuously raised from zero to a predetermined value, and a feedback control of the RF-KO voltage is carried out while keeping the gain of the feedback control at the predetermined value. |
