Piezoelectric particle accelerator

• US 9,750,124 B2
• Filed: 03/28/2016
• Issued: 08/29/2017
• Est. Priority Date: 04/03/2015
• Status: Active Grant

• Current Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford Management Co.)
• Original Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford Management Co.)
• Inventors: Kemp, Mark A., Jongewaard, Erik N., Haase, Andrew A., Franzi, Matthew
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): Sathiraju, Srinivas
• Application Number:
  US15/082,347
• Publication Number:
  US 20160338186A1
• Time in Patent Office: 519 Days
• Field of Search: None
• CPC Class Codes: H05H 15/00 Methods or devices for acceleration of charged particles not otherwise provided for , e.g. wakefield accelerators

Abstract

A particle accelerator is provided that includes a piezoelectric accelerator element, where the piezoelectric accelerator element includes a hollow cylindrical shape, and an input transducer, where the input transducer is disposed to provide an input signal to the piezoelectric accelerator element, where the input signal induces a mechanical excitation of the piezoelectric accelerator element, where the mechanical excitation is capable of generating a piezoelectric electric field proximal to an axis of the cylindrical shape, where the piezoelectric accelerator is configured to accelerate a charged particle longitudinally along the axis of the cylindrical shape according to the piezoelectric electric field.

Claims

1. A particle accelerator comprising:

a) a piezoelectric accelerator element, wherein said piezoelectric accelerator element comprises a hollow cylindrical shape; and

b) an input piezoelectric transducer, wherein said input piezoelectric transducer is disposed concentric to a first end of said hollow cylindrical piezoelectric accelerator element and is configured to provide an input signal to said hollow cylindrical piezoelectric accelerator element first end, wherein said input signal at said hollow cylindrical piezoelectric accelerator element first end induces a mechanical excitation along said hollow cylindrical piezoelectric accelerator element, wherein said mechanical excitation is capable of generating a piezoelectric electric field proximal to an axis of said cylindrical shape, wherein said piezoelectric accelerator is configured to accelerate a charged particle that is input to said first end of said hollow cylindrical piezoelectric accelerator element longitudinally along said axis of said cylindrical shape according to said piezoelectric electric field.

2. The particle accelerator according to claim 1, wherein said piezoelectric accelerator element comprises a material selected from the group consisting of Lithium Niobate, Lithium Tantalate, Quartz, and Lead Zirconate Titanate.

3. The particle accelerator according to claim 1, wherein said piezoelectric accelerator element comprises a plurality of said hollow tubes, wherein said plurality of hollow tubes are configured in an arrangement selected from the group consisting of a monolithic, single hollow tube, a series connection of hollow tubes, a concentric arrangement of nested hollow tubes, and a concentric arrangement of solid rods.

4. The particle accelerator according to claim 3, wherein said crystal-rotated series configuration is capable of establishing a tilted electric field, wherein an injected beam does not travel in a straight line down said center axis of said hollow tubes, wherein said hollow tubes are joined end to end having successively different rotations, wherein said injected beam is induced to spiral along said center of said hollow tube to provide said tilted electric field.

5. The particle accelerator according to claim 3, wherein a center hollow tube of said concentric hollow tubes is in a vacuum state, wherein said center hollow tube forms the vacuum envelope, wherein outer said hollow tubes are capable of being cooled by air or a liquid dielectric.

6. The particle accelerator according to claim 1, wherein said input piezoelectric transducer comprises a piezoelectric transducer disk disposed on one end of said piezoelectric accelerator element, wherein said piezoelectric transducer disk is disposed to impart a displacement onto said piezoelectric tube, wherein said displacement is capable of exciting a first extensional vibration mode of said piezoelectric accelerator element, wherein a stress in the material of said piezoelectric accelerator element induces an electric field that is disposed to electrostatically accelerated a charged particle.

7. The particle accelerator according to claim 6, wherein said displacement comprises a CW sinusoidal displacement.

8. The particle accelerator according to claim 7, wherein said CW sinusoidal displacement is in a range of 1-20 μ

m.

9. The particle accelerator according to claim 6, wherein said induced electric field has a field strength in a range of 0 to 4 MV/m.

10. The particle accelerator according to claim 6 further comprises a target mounted at the end of said piezoelectric accelerator element, wherein said charged particle is electrostatically accelerated by said electric field until impacting said target mounted at the end of said piezoelectric accelerator element.

11. The particle accelerator according to claim 1, wherein said charged particle is selected from the group consisting of protons, deuterium ions, tritium ions, electrons, and charged particles that are heavier than said electrons.

12. The particle accelerator according to claim 1, wherein electric field lines are proximally parallel with said axis of said hollow tube, wherein an injected beam is accelerated down said hollow tube.

13. The particle accelerator according to claim 1, wherein said piezoelectric accelerating element is disposed to operate in a bipolar mode or a single polarity mode.

14. The particle accelerator according to claim 1, wherein an end of said piezoelectric accelerator is mass loaded, wherein said mass loading is disposed to equalize the stress in said hallow tube to increase an effective gradient.

15. The particle accelerator according to claim 1, wherein a target or an ion source is at ground or high voltage.