Heat Transfer Analysis Study for the Design of the New Polychromatic Beam Neutron Reflectometer CANDOR (Chromatic Analysis Neutron Diffractometer Or Reflectometer)

Published

December 16, 2020

Author(s)

Lior Uzan, Juscelino Leao, Christoph W. Brocker, Daniel A. Mattes, Tanya J. Dax

Abstract

A newly developed polychromatic beam neutron reflectometer CANDOR (Chromatic Analysis Neutron Diffractometer Or Reflectometer) on NG-1 at the NIST Center for Neutron research (NCNR) utilizes a wavelength-sensitive neutron detector consisting of 324 analyzing highly-oriented pyrolytic graphite (HOPG) crystals positioned sequentially in rows. Known for having a small thermal diffuse scattering cross section, HOPG crystals can lead to low signal-to-noise ratios in wavelength-sensitive detectors such as CANDOR. Even though it is possible to mathematically separate the desired signal from thermal diffuse scattering; by cooling the detector array of HOPG crystals in order to minimize the Debye Waller effect generates a better solution to this problem. In this heat transfer analysis study we show, within the instrument design constrains and thermodynamic considerations, technical feasibility and test results for the development of the New Polychromatic Beam Neutron Reflectometer CANDOR (Chromatic Analysis Neutron Diffractometer Or Reflectometer) at the NIST Center for Neutron Research.

Citation

Journal of Neutron Research

Volume

22

Issue

4

Pub Type

Journals

Keywords

CANDOR, thermodynamics, simulation, COMSOL

Citation

Uzan, L. , Leao, J. , Brocker, C. , Mattes, D. and Dax, T. (2020), Heat Transfer Analysis Study for the Design of the New Polychromatic Beam Neutron Reflectometer CANDOR (Chromatic Analysis Neutron Diffractometer Or Reflectometer), Journal of Neutron Research (Accessed October 1, 2025)