Double-focusing thermal triple-axis spectrometer at the NCNR

J. W. Lynn, Y. Chen, S. Chang, Y. Zhao, S. Chi, W. Ratcliff, B. G. Ueland, R. W. Erwin

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

The new thermal triple-axis spectrometer at the NIST Center for Neutron Research (NCNR) is located at the BT-7 beam port. The 165 mm diameter reactor beam is equipped with a selection of Söller collimators, beam-limiters, and a pyrolytic graphite (PG) filter to tailor the beam for the dual 20×20 cm2 double-focusing monochromator system that provides monochromatic fluxes exceeding 108 n/cm2/s onto the sample. The two monochromators installed are PG(002) and Cu(220), which provide incident energies from 5 meV to above 500 meV. The computer controlled analyzer system offers six standard modes of operation, including a diffraction detector, a position-sensitive detector (PSD) in diffraction mode, horizontal energy focusing analyzer with detector, a Q-E mode employing a flat analyzer and PSD, a constant-E mode with the analyzer crystal system and PSD, and a conventional mode with a selection of Söller collimators and detector. Additional configurations for specific measurement needs are also available. This paper discusses the capabilities and performance for this new state-of-the-art neutron spectrometer.

Original languageEnglish
Pages (from-to)61-79
Number of pages19
JournalJournal of Research of the National Institute of Standards and Technology
Volume117
Issue number1
StatePublished - 2012
Externally publishedYes

Keywords

  • Inelastic neutron scattering
  • Neutron diffraction
  • Polarized neutrons
  • Position sensitive detector
  • Thermal neutron tripleaxis spectrometer

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