Elliptic neutron guides-focusing on tiny samples

S. Mühlbauer, P. G. Niklowitz, M. Stadlbauer, R. Georgii, P. Link, J. Stahn, P. Böni

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

We have investigated the focusing properties of the prototype of a transportable elliptic neutron guide. We demonstrate that the elliptic guide allows to map a point-like neutron source in one focal point on a tiny spot in the other focal point. We also show that an elliptically tapered neutron guide increases the neutron flux density in the focal point by at least one order of magnitude compared to the flux density of the original neutron beam. This allows to use neutron beams more efficiently in experiments with small samples. We used the elliptic neutron guide to focus a several centimeters wide neutron beam on a tiny NiS2 sample with the dimensions 0.1 mm3 and easily detected the ordered moment of this antiferromagnetic insulator. This suggests that many more small samples, in particular in high pressure experiments, can be studied with elliptic neutron guides.

Original languageEnglish
Pages (from-to)77-80
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume586
Issue number1
DOIs
StatePublished - 11 Feb 2008

Keywords

  • Elliptical neutron guides
  • Focusing neutron optics
  • Focusing on tiny samples for high pressure experiments

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