Patent Number: 
Section: claims

1. A method of treating a workpiece having an internal cavity with an interior surface, the method comprising:positioning the workpiece in a charged particle beam processing system configured to produce a charged particle beam;positioning a beam deflector inside the internal cavity of the workpiece;exposing the workpiece to said charged particle beam; andre-directing said charged particle beam toward the interior surface of the workpiece using a beam deflector surface of said beam deflector. 2. The method of claim 1, wherein said positioning the workpiece in said charged particle beam processing system further comprises:positioning the workpiece in a gas cluster ion beam (GCIB) processing system configured to produce a GCIB. 3. The method of claim 2, wherein the workpiece is a tubular workpiece, and positioning the workpiece in the GCIB processing system comprises:positioning said tubular workpiece within said GCIB processing system. 4. The method of claim 2, wherein the workpiece is an accelerator member, and positioning the workpiece in the GCIB processing system comprises:positioning said accelerator member within said GCIB processing system. 5. The method of claim 2, wherein the workpiece is a waveguide member, and positioning the workpiece in the GCIB processing system comprises:positioning said waveguide member within said GCIB processing system. 6. The method of claim 2, further comprising:adjusting the position of the workpiece relative to said GCIB. 7. The method of claim 2, further comprising:adjusting the position of said beam deflector relative to the workpiece. 8. The method of claim 7, wherein adjusting the position of said beam deflector further comprises:translating said beam deflector relative to the workpiece or rotating said beam deflector relative to the workpiece or a combination thereof. 9. The method of claim 2, wherein re-directing said GCIB comprises:electrically biasing said beam deflector such that said beam deflector surface of said beam deflector electrostatically deflects said GCIB toward the interior surface. 10. The method of claim 2, further comprising:disposing a shield member between said beam deflector and the interior surface of the workpiece, andcommunicating said GCIB from said beam deflector surface to the interior surface through an aperture in said shield member. 11. The method of claim 10, further comprising:controlling the temperature of said shield member. 12. A processing system configured to treat a workpiece having an internal cavity with an interior surface, said processing system comprising:a vacuum vessel;a charged particle beam source disposed in the vacuum vessel, said charged particle beam source configured to produce a charged particle beam;a workpiece holder configured to support the workpiece inside said vacuum vessel for treatment by said charged particle beam;a beam deflector disposed in said vacuum vessel, said beam deflector including a beam deflector surface; anda positioning system mechanically coupled with said beam deflector, said positioning system configured to position said beam deflector surface of said beam deflector inside the internal cavity of the workpiece, and said positioning system configured to move said beam deflector relative to the internal cavity of the workpiece so that said beam deflector surface intercepts and re-directs said charged particle beam toward the interior surface. 13. The processing system of claim 12, wherein said charged particle beam source comprises a gas cluster ion beam (GCIB) source configured to produce a GCIB. 14. The processing system of claim 13, wherein said beam deflector comprises:an arm member configured to extend into the internal cavity of the workpiece, said arm member carrying the beam deflector surface; andan electrical bias system electrically coupled to said arm member, said electrical bias system configured to electrically bias said arm member so that said GCIB is electrostatically re-directed by said beam deflector surface toward the interior surface of the workpiece. 15. The processing system of claim 14, wherein said positioning system is configured to adjust the position of said beam deflector surface relative to the interior surface and said GCIB by translating said arm member relative to the workpiece or rotating said arm member relative to the workpiece or both. 16. The processing system of claim 14, further comprising:a shield member disposed between said arm member and the interior surface, said shield member including an aperture positioned to communicate said GCIB from said beam deflector surface to the interior surface. 17. The processing system of claim 16, further comprising:a temperature control system coupled to said shield member, said temperature control system configured to cool or heat said shield member. 18. The processing system of claim 14, wherein said source is an inert source or a reactive source. 19. The processing system of claim 14, further comprising:a controller electrically coupled to said GCIB processing system, electrically coupled to said workpiece holder, electrically coupled to said electrical bias system, and electrically coupled to said positioning system, said controller configured to coordinate the operation of said GCIB processing system, said workpiece holder, said electrical bias system, and said positioning system according to a process recipe for treating the interior surface of the workpiece. 20. A beam deflector for use in a gas cluster ion beam (GCIB) processing system to treat a workpiece having an internal cavity with an interior surface, said beam deflector comprising:an arm member including a beam deflector surface; anda positioning system mechanically coupled with said arm member, said positioning system configured to position said arm member such that said beam deflector surface is inside the internal cavity of the workpiece, and said positioning system configured to move said arm member relative to the internal cavity of the workpiece so that said beam deflector surface intercepts and re-directs said GCIB toward the interior surface. 21. The beam deflector of claim 20, further comprising:an electrical bias system electrically coupled to said arm member, said electrical bias system configured to electrically bias said arm member so that said GCIB is electrostatically re-directed by said beam deflector surface toward the interior surface of the workpiece. 22. The beam deflector of claim 20, wherein said positioning system is configured to adjust the position of said beam deflector surface relative to the interior surface by translating said arm member relative to the workpiece or rotating said arm member relative to the workpiece or both. 23. The beam deflector of claim 20, further comprising:a shield member between said arm member and the interior surface, said shield member including an aperture positioned to communicate said GCIB from said beam deflector surface to the interior surface.