Patent ID: 9355751
Filing Date: 2016-05-31
CPC Classification: G21K,H01J

Claim Text:
1. An electrode stack, in particular a collimator electrode stack, wherein the electrode stack comprises: a plurality of stacked electrodes for manipulating a charged particle beam along an optical axis, wherein each electrode comprises an electrode body with an electrode aperture for permitting passage of the charged particle beam, wherein the electrode bodies are mutually spaced along an axial direction that is substantially parallel with the optical axis, and wherein the electrode apertures are coaxially aligned along the optical axis, and spacing structures essentially consisting of an electrically insulating material, and arranged between each pair of adjacent electrodes for positioning the electrodes at predetermined mutual distances along the axial direction; wherein a first electrode and a second electrode each comprise an electrode body with one or more support portions, wherein each support portion is configured to accommodate at least one spacing structure, wherein the electrode stack is formed with at least one clamping member that is configured for holding together the respective support portions of the first and second electrodes, with the at least one spacing structure located in between.