US 12,267,941 B2
Particle beam accelerator, particle beam blocking method for particle beam accelerator, and particle beam therapy apparatus
Shigeki Takayama, Yokohama (JP); Shinya Matsuda, Kamakura (JP); Takayuki Sako, Yamato (JP); and Tomofumi Orikasa, Yokohama (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ENERGY SYSTEMS & SOLUTIONS CORPORATION, Kawasaki (JP)
Filed on Apr. 6, 2023, as Appl. No. 18/296,466.
Application 18/296,466 is a continuation of application No. PCT/JP2021/038452, filed on Oct. 18, 2021.
Claims priority of application No. 2020-203781 (JP), filed on Dec. 8, 2020.
Prior Publication US 2023/0247753 A1, Aug. 3, 2023
Int. Cl. H05H 13/04 (2006.01); H05H 7/18 (2006.01); H05H 7/08 (2006.01)
CPC H05H 13/04 (2013.01) [H05H 7/18 (2013.01); H05H 2007/087 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A particle beam accelerator comprising:
a guiding unit configured to guide a particle beam to a trajectory;
an acceleration unit configured to accelerate the particle beam circulating on the trajectory;
a particle beam blocking unit configured to block the particle beam on the trajectory; and
a control unit configured to control the guiding unit, the acceleration unit, and the particle beam blocking unit, wherein:
the guiding unit includes a superconducting electromagnet and a superconducting electromagnet interrupter configured to interrupt the superconducting electromagnet,
the superconducting electromagnet interrupter includes a circuit breaker and a protective resistance and interrupts the superconducting electromagnet by opening the circuit breaker to form a closed circuit between the superconducting electromagnet and the protective resistance; and
a resistance value of the protective resistance is set in such a manner that an interruption time constant of the superconducting electromagnet interrupter is longer than a blocking time constant of the particle beam blocking unit, and
the control unit is configured to interrupt the superconducting electromagnet by activating the superconducting electromagnet interrupter after completion of blocking the particle beam by activating the particle beam blocking unit, when an abnormality occurs in the superconducting electromagnet.