Patent ID: 6881969

Claim:
An electron beam treatment device for treating a circular substance located in a processing, chamber with electron beams which are produced by electron beam generating devices, comprising a plurality of electron beam tubes, each of said plurality of electron beam tubes including a vacuum container and a front side, an electron beam window positioned on the front side of each of said plurality of electron beam tubes for projecting into the processing chamber and transmitting electron beams, and means for holding said circular substance directly under the windows of said plurality of electron beam tubes, wherein said plurality of electron beam tubes are located in several concentric rings around a center, located essentially over a center point of the substance, wherein the plurality of electron beam tubes are grouped according to their distance from the center point, wherein all electron beam tubes in a grouping have substantially the same output and wherein an output control is provided for controlling the output of each grouping of electron beam tubes so as to provide a uniform treatment of the entire surface of said circular substance without moving the substance in a direction transverse to the vertical axes of the electron beam tubes.