Patent Number: 
Section: claims

1. A method of manufacturing a linear accelerator head, the method comprising:assembling a waveguide comprising a plurality of cells, wherein each of the plurality of cells defines an aperture configured to receive electrons therethrough, the aperture of the plurality of cells having a diameter and defining a beam axis along a beam path, wherein assembling the plurality of cells comprises:for each of a first plurality of cells, providing a first brazing alloy between two adjacent cell members; andheating each of the first plurality of cells to a first brazing temperature;providing an electron generator configured to emit electrons along the beam path;providing a microwave generation assembly comprising:a microwave generator configured to emit microwaves in a first direction along a primary wave path; andan isolator configured to prevent microwaves from propagating in a second direction opposite the first direction along the primary wave path;providing a cooling system in thermal communication with the waveguide;providing a converter disposed within the electron beam path and configured to receive incident electrons, wherein the converter is configured to convert incident electrons into photons; andproviding a first collimator configured to define a beam shape, wherein the first collimator comprises an input aperture and an output aperture. 2. The method of manufacturing a linear accelerator head of claim 1, wherein assembling the plurality of cells comprises, for each of the first plurality of cells, machining a cavity into a portion of each of the two adjacent cell members. 3. The method of manufacturing a linear accelerator head of claim 1, wherein the first brazing alloy comprises between about 50% and about 90% copper by weight. 4. The method of manufacturing a linear accelerator head of claim 1, wherein the first brazing alloy comprises between about 10% and about 50% gold by weight. 5. The method of manufacturing a linear accelerator head of claim 1, wherein the first brazing temperature is between about 900° C. and about 1100° C. 6. The method of manufacturing a linear accelerator head of claim 1, wherein assembling the plurality of cells comprises:for each of a second plurality of cells, providing a second brazing alloy between two adjacent cell members; andheating each of a second plurality of cells to a second brazing temperature. 7. The method of manufacturing a linear accelerator head of 6, wherein assembling the plurality of cells comprises, for each of the first plurality of cells, machining a cavity into a portion of each of the two adjacent cell members. 8. The method of manufacturing a linear accelerator head of claim 6, wherein the second brazing alloy comprises between about 35% and about 75% copper by weight. 9. The method of manufacturing a linear accelerator head of claim 6, wherein the second brazing alloy comprises between about 25% and about 65% gold by weight. 10. The method of manufacturing a linear accelerator head of claim 6, wherein the second brazing alloy comprises a lower percentage by weight of copper than the first brazing alloy. 11. The method of manufacturing a linear accelerator head of claim 1, wherein providing the cooling system in thermal communication with the waveguide comprises:providing a third brazing alloy between the waveguide and a cooling plate, the cooling plate comprising a channel configured to guide fluid therethrough; andheating the waveguide and cooling plate to a third brazing temperature. 12. The method of manufacturing a linear accelerator head of claim 11, wherein the third brazing temperature is between about 700° C. and about 1000° C. 13. The method of manufacturing a linear accelerator head of claim 11, wherein the third brazing alloy comprises between about 10% and about 50% copper by weight. 14. The method of manufacturing a linear accelerator head of claim 11, wherein the third brazing alloy comprises between about 50% and about 10% gold by weight. 15. The method of manufacturing a linear accelerator head of claim 11, wherein the third brazing alloy comprises a lower percentage by weight of copper than the first brazing alloy. 16. The method of manufacturing a linear accelerator head of claim 1, further comprising dipping the first plurality of cells into a solvent configured to dissolve oil. 17. The method of manufacturing a linear accelerator head of claim 1, further comprising propagating sound waves at ultrasound frequency at the first plurality of cells. 18. The method of manufacturing a linear accelerator head of claim 1, further comprising dipping the first plurality of cells into an etching solution configured to remove at least a layer of copper. 19. The method of manufacturing a linear accelerator head of claim 18, wherein dipping the first plurality of cells into the etching solution comprises dipping the first plurality of cells into the etching solution for a total time of at least fifteen seconds. 20. The method of manufacturing a linear accelerator head of claim 18, wherein the etching solution comprises phosphoric acid.