| 摘要 |
<p>An electron beam gun contained in a high vacuum chamber comprising a plurality of high voltage surfaces comprising an emitter structure connected through filament leads to an external high voltage source; a metallic shield surrounding the high voltage surfaces, wherein the shield has a hole through which a path of electrons from the emitter structure flow to a target in the vacuum chamber; grounding means for the shield; a crucible; means to focus and direct the path of electrons from the emitter structure to the crucible over an arc passing through the hole. <IMAGE></p> |
