Photonic band gap accelerator
View Patent ↗A preferred compact particle accelerator can include a cell arranged along a longitudinal axis along which a particle beam is accelerated. The preferred cell can include a first plate disposed substantially orthogonal to the longitudinal axis and a second plate disposed substantially parallel to the first plate. The preferred cell can also include a first set of rods connecting the first plate to the second plate and disposed at a first radius about the longitudinal axis. Preferably, the first set of rods each defines an elliptical cross section. The preferred cell can also include a second set of rods connecting the first plate to the second plate and each disposed at least at a second radius greater than the first radius. Optimized geometry of the elliptical rods and the periodicity of the rods in the lattice provide improved wakefield suppression and allow for significant gains in frequency and output.
1. A particle accelerator cell arranged along a longitudinal axis along which a particle beam is accelerated comprising:
a first plate disposed substantially orthogonal to the longitudinal axis;
a second plate disposed substantially parallel to the first plate;
a first set of rods connecting the first plate to the second plate and disposed at a first radius about the longitudinal axis, the first set of rods each defining an elliptical cross section and a first periodicity there between, the first set of rods arranged such that a minor axis of each elliptical cross section is substantially parallel to an imaginary line emanating radially from the longitudinal axis; and
a second set of rods connecting the first plate to the second plate and each disposed at least at a second radius greater than the first radius, the second set of rods each defining a circular cross section and a second periodicity there between, and wherein a ratio between the first periodicity and the second periodicity is between 0.9:1 and 1.1:1, wherein a ratio between the minor axis and the second periodicity is between 1:9 and 1:12, and further wherein a ratio between a major axis and the second periodicity is between 1:3 and 1:5.
2. The particle accelerator cell of claim 1 , wherein the ratio between the first periodicity and the second periodicity is between 0.95:1 and 1.05:1.
3. The particle accelerator cell of claim 1 , wherein the ratio between the first periodicity and the second periodicity is between 0.98:1 and 1:1.
4. The particle accelerator cell of claim 1 , wherein the ratio between the first periodicity and the second periodicity is approximately 0.99:1.
5. The particle accelerator cell of claim 1 , wherein the ratio between the minor axis and the second periodicity is approximately 1:11.
6. The particle accelerator cell of claim 1 , wherein the ratio between the major axis and the second periodicity is approximately 1:4.
7. The particle accelerator cell of claim 1 , wherein the ratio between the minor axis and the second periodicity is approximately 1:11 and the ratio between the major axis and the second periodicity is approximately 1:4.
8. The particle accelerator cell of claim 1 , wherein a ratio between a radius of each of the second set of rods and the second periodicity is between 1:8 and 1:6.
9. The particle accelerator cell of claim 8 , wherein the ratio between the radius of each of the second set of rods and the second periodicity is approximately 1:7.
10. The particle accelerator cell of claim 1 , further comprising a third set of rods connecting the first plate to the second plate and each disposed at least at a third radius greater than the second radius, the third set of rods each defining a circular cross section and a third periodicity there between, and wherein a ratio between the third periodicity and the second periodicity is between 1:1 and 1.1:1.
11. The particle accelerator cell of claim 10 , wherein the ratio between the third periodicity and the second periodicity is approximately 1.05:1.
12. The particle accelerator cell of claim 1 , wherein a distance between the first plate and the second plate is between 8 and 9 millimeters.
13. The particle accelerator cell of claim 10 , wherein the major axis of each of the first set of rods is approximately 2.58 millimeters.
14. The particle accelerator cell of claim 13 , wherein the minor axis of each of the first set of rods is approximately 0.93 millimeters.
15. The particle accelerator cell of claim 14 , wherein a radius of each of the second set of rods is approximately 1.55 millimeters.
16. The particle accelerator cell of claim 15 , wherein the second periodicity is approximately 10.33 millimeters.
17. The particle accelerator cell of claim 16 , wherein the first periodicity is approximately 10.22 millimeters.
18. The particle accelerator cell of claim 17 , wherein the third periodicity is approximately 10.85 millimeters.
19. A particle accelerator comprising:
a plurality of cells arranged in series along a longitudinal axis along which a particle beam is accelerated; each of the plurality of cells comprising:
a first plate disposed substantially orthogonal to the longitudinal axis;
a second plate disposed substantially parallel to the first plate;
a first set of rods connecting the first plate to the second plate and disposed at a first radius about the longitudinal axis, the first set of rods each defining an elliptical cross section and a first periodicity there between, the first set of rods arranged such that a minor axis of each elliptical cross section is substantially parallel to an imaginary line emanating radially from the longitudinal axis;
a second set of rods connecting the first plate to the second plate and disposed at a second radius greater than the first radius, the second set of rods each defining a circular cross section and a second periodicity there between; and
a third set of rods connecting the first plate to the second plate and disposed at a third radius greater than the second radius, the third set of rods each defining a circular cross section and a third periodicity there between;
wherein a ratio between the first periodicity and the second periodicity is between 0.9:1 and 1.1:1, wherein a ratio between the minor axis and the second periodicity is between 1:9 and 1:12, wherein a ratio between a major axis and the second periodicity is between 1:3 and 1:5; and wherein a ratio between the third periodicity and the second periodicity is between 1:1 and 1.1:1.
20. A particle accelerator comprising:
a plurality of cells arranged in series along a longitudinal axis along which a particle beam is accelerated; each of the plurality of cells comprising:
a first plate disposed substantially orthogonal to the longitudinal axis;
a second plate disposed substantially parallel to the first plate and approximately 8.55 millimeters therefrom along the longitudinal axis;
a first set of rods connecting the first plate to the second plate and disposed at a first radius about the longitudinal axis, the first set of rods each defining an elliptical cross section and a first periodicity there between, the first set of rods arranged such that a minor axis of each elliptical cross section is substantially parallel to an imaginary line emanating radially from the longitudinal axis;
a second set of rods connecting the first plate to the second plate and disposed at a second radius greater than the first radius, the second set of rods each defining a circular cross section and a second periodicity there between; and
a third set of rods connecting the first plate to the second plate and disposed at a third radius greater than the second radius, the third set of rods each defining a circular cross section and a third periodicity there between;
wherein a ratio between the first periodicity and the second periodicity is approximately 0.99:1, wherein a ratio between the minor axis and the second periodicity is between 0.09:1, wherein a ratio between a major axis and the second periodicity is approximately 1.4; and wherein a ratio between the third periodicity and the second periodicity is approximately 1.05:1.