Characterization of a ballistic supermirror neutron guide

H. Abele, D. Dubbers, H. Häse, M. Klein, A. Knöpfler, M. Kreuz, T. Lauer, B. Märkisch, D. Mund, V. Nesvizhevsky, A. Petoukhov, C. Schmidt, M. Schumann, T. Soldner

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

We describe the beam characteristics of the first ballistic supermirror neutron guide H113 that feeds the neutron user facility for particle physics PF1B of the Institute Laue-Langevin, Grenoble (ILL). At present, the neutron capture flux density of H113 at its 20×6 cm2 exit window is ΦC = 1.35 × 1 010 cm- 2 s- 1, and will soon be raised to above 2×1010 cm-2 s-1. Beam divergence is no larger than beam divergence from a conventional Ni-coated guide. A model is developed that permits rapid calculation of beam profiles and absolute event rates from such a beam. We propose a procedure that permits inter-comparability of the main features of beams emitted from ballistic or conventional neutron guides.

Original languageEnglish
Pages (from-to)407-417
Number of pages11
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume562
Issue number1
DOIs
StatePublished - 15 Jun 2006
Externally publishedYes

Keywords

  • Ballistic guide
  • Cold neutrons
  • Neutron guide
  • Supermirror guide

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