High-power X-ray sources and methods of operation

• US 10,600,609 B2
• Filed: 01/31/2018
• Issued: 03/24/2020
• Est. Priority Date: 01/31/2017
• Status: Active Grant

• Current Assignee: Rapiscan Systems Incorporated (OSI Systems Incorporated)
• Original Assignee: Rapiscan Systems Incorporated (OSI Systems Incorporated)
• Inventors: Bendahan, Joseph, Wiggers, Robert Thomas
• Primary Examiner(s): Gaworecki, Mark R
• Application Number:
  US15/885,601
• Publication Number:
  US 20190043686A1
• Time in Patent Office: 783 Days
• CPC Class Codes: H01J 2235/1026 Means (motors) for driving the target (anode)
• CPC Class Codes: H01J 2235/1053 Retainers or races
• CPC Class Codes: H01J 2235/127 Control of flow
• CPC Class Codes: H01J 2235/1279 Liquid metals
• CPC Class Codes: H01J 35/1024 Rolling bearings
• CPC Class Codes: H01J 35/106 Active cooling, e.g. fluid flow, heat pipes

Abstract

The present specification discloses a high power continuous X-ray source having a rotating target assembly that is cooled by circulation of a liquid material in contact with the target assembly, whereby the target assembly has a front surface being impinged by electrons and a mechanism for rotating the target assembly. The cooling liquid is always in contact with at least one surface of the target for dissipating the heat generated by the energy deposited by the stream of electrons, thereby lowering the temperature of the target to allow for continuous operation.

Claims

1. A high power radiation production target assembly comprising:

a target sub-assembly having a copper body and a target positioned along a periphery of the copper body, wherein said target is configured to be impinged by a stream of particles to produce radiation;

a plurality of paddles positioned on said copper body;

a stream of liquid adapted to propel said paddles thereby causing a rotation and a cooling of said copper body; and

,

at least one coupling configured to provide vacuum sealing under rotation.

2. The high power radiation production target assembly of claim 1, wherein said stream of particles comprises electrons that impinge upon the rotating target to produce X-rays.

3. The high power radiation production target assembly of claim 2, wherein the electrons have an energy level and wherein the energy level is 6 MV or higher.

4. The high power radiation production target assembly of claim 1, wherein the target is a ring made of tungsten.

5. The high power radiation production target assembly of claim 1, wherein the target sub-assembly further comprises one or more flow directors configured to direct the stream of liquid in a predefined direction and to propel the plurality of paddles.

6. The high power radiation production target assembly of claim 1, wherein said liquid is water.

7. The high power radiation production target assembly of claim 1, wherein the at least one coupling is a ferro-fluidic coupling configured to provide the vacuum sealing.

8. A high power radiation production target assembly comprising:

a target sub-assembly having a copper body and a target along a periphery of the copper body, wherein said target is configured to be impinged by a stream of particles to produce radiation;

a stream of liquid adapted to cool said copper body;

a chain drive motor configured to cause a rotation of the copper body; and

,

a coupling configured to provide vacuum sealing.

9. The high power radiation production target assembly of claim 8, wherein said stream of particles comprises an electron beam configured to impinge upon the rotating copper body to produce X-rays.

10. The high power radiation production target assembly of claim 9, wherein the electrons have an energy level and wherein the energy level is 6 MV or higher.

11. The high power radiation production target assembly of claim 8, wherein the target is a ring made of tungsten.

12. The high power radiation production target assembly of claim 8, wherein the chain drive motor is configured to operate with at least one of a chain, a timing belt, a continuous cable, or a direct spur-gear coupling.

13. The high power radiation production target assembly of claim 8, wherein said liquid is water.

14. The high power radiation production target assembly of claim 8, wherein the coupling is a ferro-fluidic coupling configured to provide the vacuum sealing.

15. A method of continuously operating a radiation production target assembly comprising:

rotating a target, wherein said target is formed on a periphery of a copper body, and wherein said target is rotated using at least one of a plurality of paddles attached to the copper body, wherein the paddles are adapted to be propelled by a stream of cooling liquid, thereby causing a rotation of the target or a chain drive motor attached to the target;

impinging a stream of particles onto the rotating target to produce radiation; and

circulating the cooling liquid around the target, such that the cooling liquid is in contact with at least one surface of the target for dissipating heat generated by the impinging stream of particles, thereby cooling the target and allowing for continuous operation, wherein the target assembly further comprises a coupling adapted to provide a vacuum seal.

16. The method of claim 15, wherein the chain drive motor is operated with at least one of a chain, a timing belt, a continuous cable, or a direct spur-gear coupling.

17. The method of claim 15, wherein said stream of particles comprises an electron beam that impinges upon the rotating target to produce X-rays.

18. The method of claim 17, wherein the electrons have an energy level and wherein the energy level is 6 MV or higher.

19. The method of claim 15, wherein the target is a ring made of tungsten.

20. The method of claim 15, wherein said cooling liquid is water.

21. The method of claim 15, wherein the coupling is a ferro-fluidic coupling.