Patent ID: 6218675
Filing Date: 2001-04-17
Classification: A61N,G21K,H01J

Abstract:
A charged particle beam irradiation apparatus comprising:a plurality of scanning electromagnets, for irradiating a target with a charged particle beam emitted from an accelerator;a quadrupole electromagnet;a power source for feeding current to said quadrupole electromagnet; anda control unit for controlling said current output from said power source;wherein two of said plurality of scanning electromagnets include a first scanning electromagnet, and a second scanning electromagnet located downstream of said first scanning electromagnet, and said quadrupole electromagnet which is located between said first and second scanning electromagnets enables adjustment of a phase of betatron oscillation of said charged particle beam, and wherein said control unit controls said current so that a difference between phases in the betatron oscillation of said charged particle beam in said first and second scanning electromagnets is approximately an integer multiple of 180 deg.