US Patent No. 10,117,320


Patent No. 10,117,320
Issue Date October 30, 2018
Title Accelerator And Particle Beam Irradiation System
Inventorship Takamichi Aoki, Tokyo (JP)
Futaro Ebina, Tokyo (JP)
Hideaki Nishiuchi, Tokyo (JP)
Shigemitsu Hara, Tokyo (JP)
Masumi Umezawa, Tokyo (JP)
Takayoshi Seki, Tokyo (JP)
Assignee Hitachi, Ltd., Tokyo (JP)

Claim of US Patent No. 10,117,320

1. An accelerator comprising:an annular main coil;
a plurality of magnetic poles configured to form isochronous magnetic fields;
an ion injection port configured to inject ions into an ion injection portion disposed at a position that is different from a position of a center of gravity of the main coil in a radial direction;
an acceleration electrode configured to accelerate the ions; and
an extraction port through which an accelerated ion beam is extracted,
wherein the ion injection portion, a tip of an inner circumferential end portion of the acceleration electrode, or a tip of one of the magnetic poles extends closer to the extraction port than the center of gravity of the main coil in the radial direction.