Particle beam accelerator

• US 7,332,880 B2
• Filed: 03/14/2006
• Issued: 02/19/2008
• Est. Priority Date: 03/15/2005
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Ina, Nobuhiko, Yamamoto, Yuichi, Nagayama, Takahisa
• Primary Examiner(s): TRAN, THUY V
• Application Number:
  US11/374,182
• Publication Number:
  US 20060250097A1
• Time in Patent Office: 707 Days
• Field of Search: 315/500, 315/501, 250/396.R
• US Class Current: 315/501
• CPC Class Codes: H05H 15/00 Methods or devices for acceleration of charged particles not otherwise provided for , e.g. wakefield accelerators

Abstract

The present invention provides a particle beam accelerator for accelerating charged particles along a traveling direction of the charged particles. The invention provides a particle beam accelerator, in which the charged particle beam deflected by spiral-shaped-deflecting electromagnet 3, is accelerated by an accelerating unit 5, the charged particle beam circulating in an annular vacuum passageway of a vacuum duct 1 a plurality of times differing in orbit. And gap 9 is formed in the accelerating unit 5 of the vacuum duct 1, and gap-constituting face of the vacuum duct 1 is formed to be perpendicular to each of the traveling directions of the charged particle beam orbiting on a first orbit and on a second orbit. In the above accelerator, vibrations of the charged particle beam can be brought under control and loss of the charged particle beam can be reduced.

Claims

1. A particle beam accelerator comprising:

an annular vacuum duct having an annular passageway inside for passing a charged particle beam, and including an accelerating unit for accelerating the charged particle beam;

a plurality of spiral-shaped-deflecting electromagnets disposed circumferentially along the vacuum duct; and

an accelerating core, disposed on the accelerating unit, for accelerating the charged particle beam;

wherein

the charged particle beam, whose orbit is deflected by the spiral-shaped-deflecting electromagnet, is accelerated by the accelerating unit, the accelerating charged particle beam circulating in the annular vacuum passageway a plurality of times differing in orbit;

a gap is formed in the accelerating unit of the vacuum duct; and

the gap-constituting face of the vacuum duct is formed to be perpendicular both to the traveling direction of the charged particle beam while circulating in a first orbit, and to the traveling direction of the charged particle beam while circulating in a second orbit.

2. The particle beam accelerator according to claim 1, wherein the gap-constituting face of the vacuum duct is formed in a curve.

3. The particle beam accelerator according to claim 1, further comprising a sealing member for sealing the gap.

4. The particle beam accelerator according to claim 3, wherein the sealing member is provided on a portion of the vacuum duct jutting outwardly with respect to the portion where the gap is formed.

5. The particle beam accelerator according to claim 3, wherein the sealing member includes at least a hard insulating member.

6. The particle beam accelerator according to claim 3, wherein the vacuum duct includes a gap forming portion, inwardly jutting with respect to its main portion, and the gap is formed in the gap forming portion.

7. The particle beam accelerator according to claim 1, wherein the vacuum duct includes flanges sandwiching a resin material, and the gap is formed between the flanges linked together with the resin material intervening.

8. The particle beam accelerator according to claim 7, wherein the resin material is sandwiched between the flanges via O-ring.

9. The particle beam accelerator according to claim 7, wherein protrusions are provided on the resin material or on the flanges, and the resin material is attached to the flanges through the protrusions.

10. The particle beam accelerator according to claim 7, wherein the resin material is composed by laminating a plurality of resin sheets.

11. A particle beam accelerator comprising:

an annular vacuum duct having an annular passageway inside for passing a charged particle beam, and including an accelerating unit for accelerating the charged particle beam;

a plurality of spiral-shaped-deflecting electromagnets disposed circumferentially along the vacuum duct; and

an accelerating core, disposed on the accelerating unit, for accelerating the charged particle beam;

wherein

a gap is formed in the accelerating unit of the vacuum duct; and

the gap-constituting face of the vacuum duct is formed in a curve.

12. The particle beam accelerator according to claim 11, further comprising a sealing member for sealing the gap.

13. The particle beam accelerator according to claim 12, wherein the sealing member is provided on a portion of the vacuum duct jutting outwardly with respect to the portion where the gap is formed.

14. The particle beam accelerator according to claim 12, wherein the sealing member includes at least a hard insulating member.

15. The particle beam accelerator according to claim 12, wherein the vacuum duct includes a gap forming portion, inwardly jutting with respect to its main portion, and the gap is formed in the gap forming portion.

16. The particle beam accelerator according to claim 11, wherein the vacuum duct includes flanges sandwiching a resin material, and the gap is formed between the flanges linked together with the resin material intervening.

17. The particle beam accelerator according to claim 16, wherein the resin material is sandwiched between the flanges via O-ring.

18. The particle beam accelerator according to claim 16, wherein protrusions are provided on the resin material or on the flanges, and the resin material is attached to the flanges through the protrusions.

19. The particle beam accelerator according to claim 16, wherein the resin material is composed by laminating a plurality of resin sheets.