Patent ID: 8872057

Claim:
A linear beam device in which electrons emitted by a cathode are collected by a collector having at least one electrode, the device comprising: a housing; a first electrode disposed in the housing, the first electrode having an exterior surface in which a first channel having a longitudinal dimension is formed; and a jacket disposed in the housing, the jacket surrounding the first electrode and spaced from the exterior surface of the first electrode in confronting relationship to the exterior surface of the first electrode such that the jacket does not abut against the exterior surface of the first electrode, wherein the jacket and the first electrode defines a first interior region bounded by the jacket and the exterior surface of the first electrode, the first interior region is configured to be contiguous with the first channel along the longitudinal dimension of the first channel, the jacket and the housing are configured to define a second exterior region bounded by the jacket and the housing, and the first channel, the first interior region and the second exterior region are configured to be in fluid communication with one another.