Patent Document ID: 20100001212
Application ID: 12490696
Patent Status: 0

Claim One:
1. A charged particle beam irradiation system, comprising: a synchrotron which accelerates an ion beam, wherein the ion beam is extracted from the synchrotron; an irradiation apparatus for irradiating an object to be irradiated with the ion beam introduced from the synchrotron; detection means for measuring an amount of accumulated charge of ion beams that orbit in the synchrotron immediately before an extraction control period in an operating cycle of the synchrotron; and beam extraction control means for controlling extraction of the ion beams based on the measurement result of the accumulated beam charge amount so that extraction of a total of the ion beams is to be completed in time with expiration of an extraction control time, the extraction control time representing a length of the extraction control period of the synchrotron and being set in advance.