Patent ID: 7135677
Filing Date: 2006-11-14
Classification: H01J

Abstract:
1. A beam guiding arrangement for manipulating a beam of charged particles, the system comprising: a first beam shaper traversed by the beam along a first beam axis; a second beam shaper traversed by the beam along a second beam axis; and at least one beam deflector disposed between the first beam shaper and the second beam shaper, for displacing the first beam axis in a first direction; wherein the first beam shaper is configured to provide a beam shaping field acting on the beam and comprising a field component having a quadrupole symmetry with respect to an axis of symmetry which is displaceable in the first direction, wherein a focusing effect of the first beam shaper on the beam in a second direction is different from a focusing effect of the first beam shaper on the beam in a third direction oriented orthogonally to the second direction, and wherein the second beam shaper is configured to provide a beam shaping field acting on the beam and comprising a field component with a quadrupole symmetry, and wherein a focusing effect of the second beam shaper on the beam in the second direction is different from a focusing effect of the second beam shaper on the beam in the third direction.