Patent ID: 8890094

Claim:
An end module mountable in a charged particle multi-beamlet system, the end module comprising, in a successive arrangement along a beamlet projection direction: a beam stop array, comprising a plate with an array of beam stop apertures formed therein, adapted for letting through charged particle beamlets to be projected onto a target; a projection lens arrangement for projecting onto the target the beamlets that are let through , the projection lens arrangement comprising a plurality of successive plates that each defines a plurality of projection lenses, each plate having an array of lens apertures formed therein with the projection lenses formed at the locations of the lens apertures, the projection lenses forming an array of projection lens systems, each projection lens system comprising the corresponding projection lenses of successive plates; wherein the beam stop apertures are grouped into pluralities of apertures for letting through a corresponding plurality of beamlets originating from separate points toward a single one of the projection lens systems and at different angles.