Insulating ring for particle accelerator tubes and acceleration tube including the same

Claim 1

In a particle accelerator having a source of charged particles and a high voltage terminal, an acceleration tube in electrical communication with said high voltage source comprising a multiplicity of alternating electrode disks and insulating rings, an annular cavity formed at the inner circumferential junctures of adjacent disks and rings, each said cavity founded on a first side by said electrode disk, on a second side opposite to said first side and on a third side between the first and second sides by said insulating ring, and on a fourth side by the open interior of the tube, the cross-sectional length of said second side and said third side falling respectively within the ranges 0.225 inch to 0.275 inch and 0.075 inch to 0.125 inch, each said insulating ring having at least one annular groove per inch of axial length extending from the inner circumferential surfaces of said insulating rings between said cavities into the rings, by an amount deeper than the cross-sectional length of said second cavity side.