Patent ID: 8796620

Claim:
A charged particle lens assembly comprising: a hollow body defining a first end, a second end and a first axis extending from the first end to the second end along a centerline of the hollow body, wherein the hollow body is substantially linear along the first axis and the hollow body has an aspect ratio of between 1.3 and 1.6 defined by a longitudinal length along the first axis divided by a diameter of the first end, the second end, or both; a first electrode assembly positioned relative to the first end of the hollow body and defining a first aperture spaced from the first axis for receiving an incident beam of charged particles; and a second electrode assembly positioned relative to the second end of the hollow body and defining a second aperture spaced from the first axis for passing charged particles out of the lens assembly, the hollow body configured to, when an electric potential is applied, direct a supply of charged particles incident from the first aperture towards the second aperture for exiting the assembly while crossing at least a portion of the first axis.