Patent ID: 7668298

Claim:
An electron collector assembly for collecting backscattered electrons within a substantially evacuated vessel that contains an electron-emitting cathode and an electron-attracting anode spaced apart therein, said electron collector assembly comprising: a 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 second plate mounted proximate to said cathode within said vessel, said second plate having a first side and a second side at least partially facing said cathode; an inner member positioned between said first plate and said second plate, said inner member having an internal conduit for conveying a heat absorbing cooling fluid therethrough; an inlet in fluid communication with said internal conduit; and an outlet in fluid communication with said internal conduit; wherein the second side of the first plate is substantially conterminous with a first side of the inner member, and the first side of the second plate is substantially conterminous with a second side, opposite the first side of the inner member.