Double-Focusing Thermal Triple-Axis Spectrometer at the NCNR

Published

February 2, 2012

Author(s)

Y. Chen, Sung Chang, Yang Zhao, Songxue Chi, William D. Ratcliff, B. G. Ueland, Ross Erwin

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 pyrolytic graphite (PG) filter to tailor the beam for the dual 20X20 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 for 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. The capabilities and performance are described for this new state-of-the-art neutron spectrometer.

Citation

Journal of Research (NIST JRES) - 117.002

Report Number

117.002

Volume

117

NIST Pub Series

Journal of Research (NIST JRES)

Pub Type

NIST Pubs

Download Paper

https://doi.org/10.6028/jres.117.002

Local Download

Keywords

Neutron Spectrometer, Thermal Neutrons, Triple Axis, Horizontal Focusing, Position Sensitive Detector, Polarized Neutrons

Citation

Chen, Y. , Chang, S. , Zhao, Y. , Chi, S. , Ratcliff, W. , Ueland, B. and Erwin, R. (2012), Double-Focusing Thermal Triple-Axis Spectrometer at the NCNR, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/jres.117.002, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=909333 (Accessed October 31, 2024)