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