Patent Number: 
Section: claims

1. A non-resonance photo-neutralizer for neutral beam injectors comprisingfirst and second mirrors having opposing mirror surfaces forming a photon trap, wherein the mirror surface of the first mirror is concave and the mirror surface of the second mirror is flat, wherein the first mirror comprises a mirror assembly including a central mirror and first and second outer mirrors coupled to the central mirror. 2. The photo-neutralizer of claim 1 wherein the photon trap comprises a confinement region adjacent a family of normals common to the mirror surfaces of the first and second mirrors. 3. The photo-neutralizer of claim 1 wherein the central mirror is cylindrically shaped and the outer mirrors are conically shaped. 4. A negative ion based neutral beam injector comprisinga negative ion source, anda non-resonance photo-neutralizer co-axially positioned with the negative ion source, wherein the photo-neutralizer including first and second mirrors having opposing mirror surfaces forming a photon trap, wherein the mirror surface of the first mirror is concave and the mirror surface of the second mirror is flat, wherein the first mirror comprises a mirror assembly including a central mirror and first and second outer mirrors coupled to the central mirror. 5. The neutral beam injector of claim 4 wherein the photon trap comprises a confinement region adjacent a family of normals common to the first and second mirror surfaces. 6. The neutral beam injector of claim 4 wherein the central mirror is cylindrically shaped and the outer mirrors are conically shaped.