CYCLOTRON

• US 20140042934A1
• Filed: 08/08/2013
• Published: 02/13/2014
• Est. Priority Date: 08/13/2012
• Status: Active Grant

• Current Assignee: Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Heavy Industries Limited
• Inventors: Tsutsui, Hiroshi
• Granted Patent: US 9,451,689 B2
• Time in Patent Office: Days
• US Class Current: 315/502
• CPC Class Codes: H05H 13/005 Cyclotrons
• CPC Class Codes: H05H 13/02 Synchrocyclotrons, i.e. frequency modulated cyclotrons
• CPC Class Codes: H05H 7/04 Magnet systems , e.g. undulators, wigglers free-electron laser H01S3/0903; Energisation thereof

Abstract

A cyclotron includes: a regenerator configured to move a beam of a charged particle on an orbit radially outward; and a magnetic channel configured to put the beam on an extraction orbit. The regenerator includes a pair of magnetic members for a regenerator. The magnetic member for a regenerator includes a first portion including a portion becoming closer to the median plane radially outward and an apex closest to the median plane. When viewed from the circumferential direction, assuming that a distance between the centerline of the apex in the radial direction and a first reference position set on a radially inner end side of the first portion is a first distance and a distance between the centerline and a second reference position set on a radially outer end side of the first portion is a second distance, the first distance is greater than the second distance.

Claims

1. A cyclotron, comprising:

a regenerator configured to move a beam of a charged particle on an orbit radially outward; and

a magnetic channel configured to put the beam on an extraction orbit,

wherein the regenerator includes a pair of magnetic members for a regenerator facing each other with a median plane of the beam interposed therebetween,

each of the magnetic members for a regenerator includes a first portion that includes a portion, which becomes closer to the median plane radially outward, and an apex closest to the median plane, and

when viewed from a circumferential direction, assuming that a distance between a centerline of the apex in a radial direction and a first reference position set on a radially inner end side of the first portion is a first distance and a distance between the centerline and a second reference position set on a radially outer end side of the first portion is a second distance, the first distance is greater than the second distance.

2. The cyclotron according to claim 1,

wherein the second reference position is set at a radially outer end of the first portion.

3. The cyclotron according to claim 1,

wherein the first reference position is set at a position where a magnetic field, which is larger than a magnetic field generated by the apex by ¼

of the magnetic field, is generated.

4. The cyclotron according to claim 1,

wherein the magnetic channel includes a magnetic member for a magnetic channel disposed on an outer side of the magnetic member for a regenerator in the radial direction, and

when viewed from the circumferential direction, assuming that a distance between the centerline and a radially inner end of the magnetic member for a magnetic channel is a third distance, the first distance is equal to or greater than the third distance.

5. The cyclotron according to claim 1,

wherein a radially outer end of the first portion of the magnetic member for a regenerator is adjacent to the apex radially outward, and is perpendicular to the median plane and extends to an opposite side of the median plane, and

the second reference position is set at a radially outer end of the first portion.

6. The cyclotron according to claim 1,

wherein the magnetic member for a regenerator includes a second portion, which protrudes to the median plane side, on an inner side in the radial direction than the first portion, and

the second portion protrudes to the median plane side more than a portion adjacent to the second portion radially outward.

7. The cyclotron according to claim 1,

wherein, in the radial direction, the magnetic member for a magnetic channel is in contact with the magnetic member for a regenerator.

8. The cyclotron according to claim 1, further comprising:

another magnetic channel that is provided on an upstream side of the magnetic channel in a direction of the beam and on a downstream side of the regenerator in the direction of the beam,

wherein the another magnetic channel is formed of a coil.

9. The cyclotron according to claim 1,

wherein the cyclotron is a synchrocyclotron.