Spherical Aberration Corrections for the Electrostatic Gridded Lens

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Two methods of spherical aberration corrections of an electrostatic gridded lens have been studied with ray tracing simulations. Both methods are based on modifying electrostatic field on the periphery of the lens. In a simplest case such modification is done by extending the part of the grid support on its radial periphery in axial direction. In alternative method the electric field on the radial periphery of the lens is modified by applying an optimum voltage on an electrically isolated correcting electrode. It was demonstrated, that for a given focal length the voltage on this lens can be optimized for minimum ... continued below

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Pikin,A. May 1, 2008.

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Description

Two methods of spherical aberration corrections of an electrostatic gridded lens have been studied with ray tracing simulations. Both methods are based on modifying electrostatic field on the periphery of the lens. In a simplest case such modification is done by extending the part of the grid support on its radial periphery in axial direction. In alternative method the electric field on the radial periphery of the lens is modified by applying an optimum voltage on an electrically isolated correcting electrode. It was demonstrated, that for a given focal length the voltage on this lens can be optimized for minimum aberration The performance of lenses is presented as a lens contribution to the beam RMS normalized emittance.

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  • Report No.: BNL--81593-2008-IR
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/939980 | External Link
  • Office of Scientific & Technical Information Report Number: 939980
  • Archival Resource Key: ark:/67531/metadc901532

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  • May 1, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 1, 2016, 5:39 p.m.

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Pikin,A. Spherical Aberration Corrections for the Electrostatic Gridded Lens, report, May 1, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc901532/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.