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The Lund Nuclear Microprobe sub-micron set-up. Part I: Ion optics calculation

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Author

Summary, in English

A new beam line for generating a sub-micron beam spot for high-resolution nuclear microprobe applications has been constructed at the Lund nuclear microprobe facility. In this paper, the first in a series of three, a detailed theoretical investigation of different focusing systems is presented based on calculations performed with the computer programs PRAM and OXTRACE. Comparison is made between a doublet, a triplet, a quadruplet and a split quadruplet (two-stage focusing). For the split quadruplet all four quadrupole magnets were uncoupled. The conclusion from the calculations was that to obtain the smallest possible beam, the two-stage focusing system should be used. Such a focusing system (a doublet at each stage) has been chosen for the new sub-micron set-up at the Lund NMP laboratory. The first stage focuses the beam in an intermediate chamber, which has a high-resolution optical viewing system facilitating more control over the beam spot. This real image of the first stage is then used as a virtual object for the second stage.

Department/s

Publishing year

2005

Language

English

Pages

1-6

Publication/Series

Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

Volume

231

Issue

1-4

Document type

Journal article

Publisher

Elsevier

Topic

  • Subatomic Physics

Keywords

  • PRAM
  • ion optics
  • OXTRACE
  • nuclear microprobe
  • sub-micron beam

Status

Published

Research group

  • Nuclear Microprobe

ISBN/ISSN/Other

  • ISSN: 0168-583X