Journal of Neutron Research - Volume 22, issue 4

Authors: Hadad, Nancy | Anderson, D.C. | Désert, S. | Hadad, N. | Olsen, S.R. | Sutton, I. | Vehres, G. | Adler, D. | Ogg, B. | Pierce, D.

Article Type: Editorial

Abstract: We present a summary description of the 8th annual international Design and Engineering of Neutron Instruments Meeting (DENIM) which was held in North Bethesda, MD, USA, September 17–19, 2019. DENIM VIII was organized by the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR) in combination with the University of Maryland (UMD). DENIM specifically addresses the unique field of neutron instrument engineering, a subcategory of neutron scattering science. DENIM is organized by engineers for engineers who share openly about what works and what doesn’t work in the life cycle design of an instrument used to analyze materials …with neutrons. DENIM is held under the patronage of the International Society of Neutron Instrument Engineers which was formed in 2017. At DENIM VIII, there were 3 keynote talks, 29 additional presentations and 13 posters (presented to the plenary in a poster slam session). Attendees toured the unique labs at NIST including the NCNR. Four parallel knowledge sharing sessions helped attendees explore mutual challenges and solutions in the areas of Instrument Installation Survey and Alignment, Electrical Grounding, Choppers and Velocity Selectors, and 3D Printing. Show more

Keywords: Neutron instrument engineering, design and engineering of neutron instruments meeting, DENIM, International Society of Neutron Instrument Engineers, ISNIE, International Atomic Energy Agency, IAEA, neutron instrument installation, survey and alignment, electrical grounding, choppers, velocity selectors, 3D printing, neutron guides, neutron optics, neutron detectors

DOI: 10.3233/JNR-200174

Citation: Journal of Neutron Research, vol. 22, no. 4, pp. 371-378, 2020

Authors: Robillard, T. | Lavie, P. | Dael, A. | Aubert, G. | Bredy, P. | Madur, A. | Berriaud, C. | Rifflet, J.-M. | Nguyen-Ba, D. | Klimko, S. | Exil, G. | Fabreges, X. | Petit, S. | Bataille, A.M.

Article Type: Research Article

Abstract: The LLB is part of a large project aiming at the development of experimental tools available for the spintronics community. This includes the design and construction of vector magnets for neutron and X-ray scattering (deployed on the Léon Brillouin-Orphée and Synchrotron SOLEIL TGIRs: neutron diffractometer 6T2 and XMRS Sextants). For neutron scattering, a very innovative design has been developed, relying solely on the use of vertical axis coils. This magnet called WAVE (for Wide Aperture VEctor) is now available at the LLB-Orphée for the user community.

Keywords: WAVE, magnet, spintronics, diffraction, LLB, vector, 3D, transport measurements, magnetism, superconductors

DOI: 10.3233/JNR-200167

Citation: Journal of Neutron Research, vol. 22, no. 4, pp. 379-391, 2020

Authors: Cooper, Simon

Article Type: Research Article

Abstract: The Italian Neutron Experimental Station, or INES for short, instrument beamline at the ISIS Neutron and Muon Spallation Source recently underwent an upgrade to its sample positioning area to improve the sample handling capability and capacity of the instrument. INES is a powder diffractometer instrument devoted to materials characterization and cultural heritage studies. Due to the types of samples received for cultural heritage studies the instrument scientists wanted to maximize the height of samples that could be scanned with the instrument. This paper covers the in-house design and delivery of a new, two axis, linear positioning stage for INES that …due to the addition of a new linear height stage, needed to be as low profile as possible to give the instrument scientists the sample capacity they required. Show more

Keywords: Design, neutron, sample stage, motion

DOI: 10.3233/JNR-200169

Citation: Journal of Neutron Research, vol. 22, no. 4, pp. 393-401, 2020

Authors: Amsil, H. | Jalil, A. | Embarch, K. | Bounouira, H. | Didi, A. | Laraki, K. | Marah, H. | Chetaine, A.

Article Type: Research Article

Abstract: The first installation around the tangential beam tube of the Moroccan TRIGA Mark II research reactor comprises combined instruments for Prompt Gamma Neutron Activation Analysis (PGAA) and Neutron Imaging (NI). The implementation of this project is divided over three main stages, namely the installation of the collimator and the primary beam shutter, which is a common section for introduction inside the reactor; the PGAA instruments’ installation; and finally, the installation of the PGNAA/NI combined instruments. The entire design was planned for this project, and detailed information about the first and the second stage is described in this work.

Keywords: PGAA, neutron fluence rate, beam tube, reactor, collimator

DOI: 10.3233/JNR-200171

Citation: Journal of Neutron Research, vol. 22, no. 4, pp. 403-415, 2020

Authors: Uzan, Lior | Leão, Juscelino B. | Brocker, Christoph | Mattes, Daniel | Dax, Tanya

Article Type: Research Article

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. Show more

Keywords: CANDOR, thermodynamics, simulation, COMSOL

DOI: 10.3233/JNR-200173

Citation: Journal of Neutron Research, vol. 22, no. 4, pp. 417-428, 2020