| Summary: | Spot scanning irradiation is a novel and powerful scheme for particle therapy. The pulsed beam structure of FFAG (Fixed Field Alternating Gradient) accelerator is suitable for the scheme. In order to form an uniform dose distribution in a target volume, Beam intensity must be modulated in sync with beam energy modulation. The intensity modulation requires precise intensity control and constrain the bunch intensity of accelerator of pulsed beam structure. In the paper, injection related issue, that is the intensity modulation of FFAG accelerator, is discussed from the view point of spot scanning.
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