Patent ID: 7359486
Filing Date: 2008-04-15
Classification: H01J

Abstract:
1. An electron-collecting structure for collecting scattered electrons within a substantially evacuated vessel that contains an electron-emitting cathode and an electron-attracting anode spaced apart therein, said electron-collecting structure comprising: an electrically conductive and thermally emissive first plate mounted proximate to said anode within said vessel, said first plate having a first side at least partially facing said anode and a second side facing opposite said first side; a thermally emissive and substantially planar second plate mounted proximate to said cathode within said vessel, said second plate having a first side that is substantially conterminous with said second side of said first plate and a second side at least partially facing said cathode, and said second plate having an internal conduit for conveying fluid within said second plate; an inlet in fluid communication with said conduit in said second plate; and an outlet in fluid communication with said conduit in said second plate; wherein a heat-absorbing fluid is circulated into said conduit in said second plate via said inlet, said first plate is electrically charged so as to attract scattered electrons to its first side, energy from attracted electrons is transferred as thermal energy from said first plate and to said fluid, and said fluid is circulated out of said conduit and away from said second plate via said outlet.