Patent ID: 7250727

Claim:
Apparatus for beam processing comprising: a high power, long focus electron source for generating an e-beam; said high power, long focus electron source for generating an e-beam including an RF electron gun having a planar focusing cathode for providing a focused electron beam having a selected dielectric material for providing an electron beam emission surface; said electron beam emission surface including a substantially flat surface; a first metal surface behind said dielectric material; a second metal surface radially surrounding said dielectric material; said first metal surface and said second metal surface for shaping electric fields that accelerate and guide an electron beam from the electron beam emission surface; and said dielectric material being penetrated by electric fields and allowing the planar focusing cathode to provide focusing of said electron beam starting at said substantially flat surface of the cathode dielectric material; a series of steering magnets transporting the e-beam for steering the e-beam and at least one refocusing magnet for refocusing the e-beam; and a final steering magnet for bending the e-beam to focus on a target.