Slot-Coupled CW Standing Wave Accelerating Cavity

• US 20150366046A1
• Filed: 06/05/2015
• Published: 12/17/2015
• Est. Priority Date: 06/13/2014
• Status: Active Grant

• Current Assignee: Jefferson Science Associates, Llc
• Original Assignee: Jefferson Science Associates, Llc
• Inventors: Rimmer, Robert, Wang, Shaoheng, Wang, Haipeng
• Granted Patent: US 9,655,227 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H05H 2007/225 coupled cavities arrangements
• CPC Class Codes: H05H 7/18 Cavities; Resonators travelling-wave tubes H01J23/18; hyperfrequency cavities in general H01P7/04, H01P7/06
• CPC Class Codes: H05H 7/22 Details of linear accelerators, e.g. drift tubes H05H7/02 - H05H7/20 take precedence
• CPC Class Codes: H05H 9/044 Coupling cavity LINACS, e.g. side coupled

Abstract

A slot-coupled CW standing wave multi-cell accelerating cavity. To achieve high efficiency graded beta acceleration, each cell in the multi-cell cavity may include different cell lengths. Alternatively, to achieve high efficiency with acceleration for particles with beta equal to 1, each cell in the multi-cell cavity may include the same cell design. Coupling between the cells is achieved with a plurality of axially aligned kidney-shaped slots on the wall between cells. The slot-coupling method makes the design very compact. The shape of the cell, including the slots and the cone, are optimized to maximize the power efficiency and minimize the peak power density on the surface. The slots are non-resonant, thereby enabling shorter slots and less power loss.

Claims

1. A slot-coupled CW standing wave accelerating cavity, comprising:

a plurality of interconnected cells;

a wall between each of said interconnected cells;

a plurality of coupling slots on the walls between said interconnected cells; and

said coupling slots in said walls are in axial alignment with a corresponding slot in the plurality of interconnected cells.

2. The slot-coupled CW standing wave accelerating cavity of claim 1, further comprising

an equator on each of said cells;

and

a cylindrical strip at each equator.

3. The slot-coupled CW standing wave accelerating cavity of claim 1, wherein said slots are kidney-shaped.

4. The slot-coupled CW standing wave accelerating cavity of claim 1, further comprising three or more of said slots on each of said walls.

5. The slot-coupled CW standing wave accelerating cavity of claim 2, wherein each of said cells in said plurality of interconnected cells is of a different length for graded beta acceleration.

6. The slot-coupled CW standing wave accelerating cavity of claim 5, wherein the width of the cylindrical strip is changed for different cells to vary the cell length.

7. The slot-coupled CW standing wave accelerating cavity of claim 1, wherein

the plurality of cells include a gap spacing and a cell length;

the plurality of cells form a graded beta cavity; and

the gap spacing and cell length are varied to accommodate varying beta and form a graded beta cavity.

8. The slot-coupled CW standing wave accelerating cavity of claim 7, wherein

each of the interconnected cells in the plurality of cells include a cone angle;

and

the cone angle is same for all cells.

9. The slot-coupled CW standing wave accelerating cavity of claim 1, wherein each of said cells in said plurality of interconnected cells is of equal lengths for beta equal to 1 acceleration.

10. The slot-coupled CW standing wave accelerating cavity of claim 1, further comprising an internal cooling channel in each wall.

11. The slot-coupled CW standing wave accelerating cavity of claim 1, wherein

the interconnected cells include a center symmetric axis;

and

each of said slots extends an angle of 60 degrees around the center symmetric axis.

12. The slot-coupled CW standing wave accelerating cavity of claim 1, wherein the dimensions and geometry for the cell walls and slots are the same in each cell.

13. A method for high efficiency graded beta acceleration, comprising:

a. providing a plurality of interconnected cells of varying length separated by walls there between;

b. providing a plurality of coupling slots on the walls between the interconnected cells; and

c. axially aligning each of the coupling slots in the walls with a corresponding slot in the plurality of interconnected cells.

14. The method of claim 13, further comprising

providing a gap spacing between the interconnected cells;

and

varying the gap spacing between the cells accommodate varying beta and form a graded beta cavity.

15. The method of claim 13, further comprising providing an internal cooling channel in each wall.

16. The method of claim 13, further comprising

providing a cone having a cone angle on each of said cells;

and

setting the cone angle the same for all cells.