ACCELERATOR AND PARTICLE BEAM RADIATION DEVICE

• Main Authors: UMEZAWA Masumi, HARA Shigemitsu, SEKI Takayoshi, EBINA Fuutarou, NISHIUCHI Hideaki, AOKI, Takamichi
• Format: Patent
• Language: English; French; German
• Published: 18.11.2020
• Subjects: ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; ELECTROTHERAPY; HUMAN NECESSITIES; HYGIENE; MAGNETOTHERAPY; MEDICAL OR VETERINARY SCIENCE; PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OFNEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMICBEAMS; RADIATION THERAPY; ULTRASOUND THERAPY

To provide an accelerator which is capable of efficiently extracting ion beams of different energies. The accelerator includes a circular vacuum container including a pair of circular return yokes facing each other. An injection electrode 18 is disposed closer to an inlet of a beam extraction path in the return yoke than a central axis of the vacuum container. Six magnetic poles are radially disposed from the injection electrode 18 at the periphery of the injection electrode 18 in the return yoke. Six recessions are disposed alternately with the respective magnetic poles in the circumferential direction of the return yoke. In the vacuum container, a concentric trajectory region, in which multiple beam turning trajectories 78 centered around the injection electrode 18 are present, is formed, and an eccentric trajectory region, in which multiple beam turning trajectories eccentric from the injection electrode 18 are present, is formed around the region. In the eccentric trajectory region, the beam turning trajectories 78 are dense between the injection electrode 18 and the inlet of the beam extraction path. Gaps between the beam turning trajectories 78 are wide in a direction 180° opposite to the inlet of the beam extraction path relative to the injection electrode 18.