US 12,101,869 B2
Particle accelerator and particle beam therapy apparatus
Kota Mizushima, Chiba (JP); and Toshiyuki Shirai, Chiba (JP)
Assigned to National Institutes for Quantum Science and Technology, Chiba (JP)
Appl. No. 17/999,995
Filed by National Institutes for Quantum Science and Technology, Chiba (JP)
PCT Filed Jan. 29, 2021, PCT No. PCT/JP2021/003180
§ 371(c)(1), (2) Date Nov. 28, 2022,
PCT Pub. No. WO2021/260988, PCT Pub. Date Dec. 30, 2021.
Claims priority of application No. 2020-108088 (JP), filed on Jun. 23, 2020.
Prior Publication US 2023/0209696 A1, Jun. 29, 2023
Int. Cl. H05H 7/04 (2006.01); A61N 5/10 (2006.01); H05H 7/00 (2006.01); H05H 13/04 (2006.01)
CPC H05H 7/04 (2013.01) [A61N 5/1078 (2013.01); H05H 7/001 (2013.01); H05H 13/04 (2013.01); A61N 2005/1087 (2013.01); H05H 2007/046 (2013.01); H05H 2277/11 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A particle accelerator that accelerates a charged particle beam while circulating the charged particle beam as a circulating beam and outputs some of the circulating beam as an output beam, the particle accelerator comprising:
a plurality of deflection sections each having a deflection electromagnet;
a plurality of straight sections each not having the deflection electromagnet; and
a control unit,
wherein the plurality of straight sections include
a first straight section having a preceding output deflector,
a second straight section that is disposed on a downstream side of the first straight section in a traveling direction of the circulating beam and has a quadrupole electromagnet, and
a third straight section that is disposed on a downstream side of the second straight section in the traveling direction of the circulating beam and has a succeeding output deflector,
wherein the plurality of deflection sections include
a first deflection section connecting the first straight section and the second straight section to each other, and
a second deflection section connecting the second straight section and the third straight section to each other,
wherein the preceding output deflector deflects some of the circulating beam toward one of an inner side and an outer side of a circulating trajectory of the circulating beam to separate the some of the circulating beam as an output beam,
wherein the succeeding output deflector deflects the output beam separated from the circulating beam by the preceding output deflector toward the other of the inner side and the outer side of the circulating trajectory of the circulating beam, and
wherein the control unit controls at least the quadrupole electromagnet such that a phase advance of a betatron oscillation of the output beam is 270±45 degrees in a section from the preceding output deflector to the succeeding output deflector.