1
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Robledo JI, Frielinghaus H, Willendrup P, Lieutenant K. Learning from virtual experiments to assist users of Small Angle Neutron Scattering in model selection. Sci Rep 2024; 14:14996. [PMID: 38951158 PMCID: PMC11217390 DOI: 10.1038/s41598-024-65712-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Accepted: 06/24/2024] [Indexed: 07/03/2024] Open
Abstract
In this work, we combine the advantages of virtual Small Angle Neutron Scattering (SANS) experiments carried out by Monte Carlo simulations with the recent advances in computer vision to generate a tool that can assist SANS users in small angle scattering model selection. We generate a dataset of almost 260.000 SANS virtual experiments of the SANS beamline KWS-1 at FRM-II, Germany, intended for Machine Learning purposes. Then, we train a recommendation system based on an ensemble of Convolutional Neural Networks to predict the SANS model from the two-dimensional scattering pattern measured at the position-sensitive detector of the beamline. The results show that the CNNs can learn the model prediction task, and that this recommendation system has a high accuracy in the classification task on 46 different SANS models. We also test the network with real data and explore the outcome. Finally, we discuss the reach of counting with the set of virtual experimental data presented here, and of such a recommendation system in the SANS user data analysis procedure.
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Affiliation(s)
- José Ignacio Robledo
- Jülich Centre for Neutron Science 2 (JCNS2), Forschungszentrum Jülich, 52428, Jülich, Germany.
| | - Henrich Frielinghaus
- Jülich Centre for Neutron Science 4 (JCNS4), Forschungszentrum Jülich, 85748, Garching, Germany
| | - Peter Willendrup
- Physics Department, Technical University of Denmark, 2800, Kongens Lyngby, Denmark
- Data Management and Software Centre (DMSC), European Spallation Source, 2800, Kongens Lyngby, Denmark
| | - Klaus Lieutenant
- Jülich Centre for Neutron Science 2 (JCNS2), Forschungszentrum Jülich, 52428, Jülich, Germany
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2
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Samothrakitis S, Bertelsen M, Willendrup PK, Knudsen EB, Larsen CB, Rizzi N, Zanini L, Santoro V, Strobl M. Neutron instrument concepts for a high intensity moderator at the European spallation source. Sci Rep 2024; 14:9360. [PMID: 38653793 DOI: 10.1038/s41598-024-59506-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 04/11/2024] [Indexed: 04/25/2024] Open
Abstract
In the course of the Horizon 2020 project HighNESS, a second moderator concept has been developed for the European Spallation Source, which complements the currently built moderator and is optimized for high intensity with a large viewable surface area. In this work we introduce conceptual designs for neutron instruments for condensed matter research designed to make optimal use of the capabilities of this moderator. The focus is on two concepts for small-angle neutron scattering and one neutron imaging instrument, which are intended to complement corresponding instruments that are already under construction at the European Spallation Source. One small-angle neutron scattering instrument concept resembles a conventional pinhole collimator geometry and aims to profit from the proposed second moderator by enabling to illuminate larger samples and providing particularly high resolution, drawing on a 30 m collimation and corresponding detector distance. A second small-angle neutron scattering instrument concept adopts nested mirror optics that enable to efficiently exploit the large moderator size and provide high resolution by focusing on the detector. The neutron imaging instrument concept is a typical pinhole instrument that can be found at continuous sources and draws on the corresponding strengths of high flux and large homogeneous fields-of-view, while still providing moderate wavelength resolution for advanced imaging methods.
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Affiliation(s)
| | | | - Peter K Willendrup
- European Spallation Source ERIC, Lund, Sweden
- Department of Physics, Technical University of Denmark, Copenhagen, Denmark
| | | | - Camilla B Larsen
- Applied Materials Group, Paul Scherrer Institute, Villigen, Switzerland
| | - Nicola Rizzi
- Department of Physics, Technical University of Denmark, Copenhagen, Denmark
| | - Luca Zanini
- European Spallation Source ERIC, Lund, Sweden
| | | | - Markus Strobl
- Applied Materials Group, Paul Scherrer Institute, Villigen, Switzerland.
- Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.
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3
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Larsen AH, Brookes E, Pedersen MC, Kirkensgaard JJK. Shape2SAS: a web application to simulate small-angle scattering data and pair distance distributions from user-defined shapes. J Appl Crystallogr 2023; 56:1287-1294. [PMID: 37555217 PMCID: PMC10405587 DOI: 10.1107/s1600576723005848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 07/03/2023] [Indexed: 08/10/2023] Open
Abstract
Shape2SAS is a web application that allows researchers and students to build intuition about and understanding of small-angle scattering. It is available at https://somo.chem.utk.edu/shape2sas. The user defines a model of arbitrary shape by combining geometrical subunits, and Shape2SAS then calculates and displays the scattering intensity and the pair distance distribution, as well as a visualization of the user-defined shape. Simulated data with realistic noise are also generated. Here, it is demonstrated how Shape2SAS can calculate and display the different scattering patterns for various geometrical shapes, such as spheres and cylinders. It is also shown how the effect of structure factors can be visualized. Finally, it is indicated how multi-contrast particles can readily be generated, and how the calculated scattering may be used to validate and visualize analytical models generated in analysis software for fitting small-angle scattering data.
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Affiliation(s)
| | | | | | - Jacob Judas Kain Kirkensgaard
- Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
- Department of Food Science, University of Copenhagen, Copenhagen, Denmark
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4
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Brügger A, Bilheux HZ, Lin JYY, Nelson GJ, Kiss AM, Morris J, Connolly MJ, Long AM, Tremsin AS, Strzelec A, Anderson MH, Agasie R, Finney CEA, Wissink ML, Hubler MH, Pellenq RJM, White CE, Heuser BJ, Craft AE, Harp JM, Tan C, Morris K, Junghans A, Sevanto S, Warren JM, Esteban Florez FL, Biris AS, Cekanova M, Kardjilov N, Schillinger B, Frost MJ, Vogel SC. The Complex, Unique, and Powerful Imaging Instrument for Dynamics (CUPI2D) at the Spallation Neutron Source (invited). THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:2890223. [PMID: 37171234 DOI: 10.1063/5.0131778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 03/05/2023] [Indexed: 05/13/2023]
Abstract
The Oak Ridge National Laboratory is planning to build the Second Target Station (STS) at the Spallation Neutron Source (SNS). STS will host a suite of novel instruments that complement the First Target Station's beamline capabilities by offering an increased flux for cold neutrons and a broader wavelength bandwidth. A novel neutron imaging beamline, named the Complex, Unique, and Powerful Imaging Instrument for Dynamics (CUPI2D), is among the first eight instruments that will be commissioned at STS as part of the construction project. CUPI2D is designed for a broad range of neutron imaging scientific applications, such as energy storage and conversion (batteries and fuel cells), materials science and engineering (additive manufacturing, superalloys, and archaeometry), nuclear materials (novel cladding materials, nuclear fuel, and moderators), cementitious materials, biology/medical/dental applications (regenerative medicine and cancer), and life sciences (plant-soil interactions and nutrient dynamics). The innovation of this instrument lies in the utilization of a high flux of wavelength-separated cold neutrons to perform real time in situ neutron grating interferometry and Bragg edge imaging-with a wavelength resolution of δλ/λ ≈ 0.3%-simultaneously when required, across a broad range of length and time scales. This manuscript briefly describes the science enabled at CUPI2D based on its unique capabilities. The preliminary beamline performance, a design concept, and future development requirements are also presented.
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Affiliation(s)
- Adrian Brügger
- Civil Engineering & Engineering Mechanics, Columbia University, New York, New York 10027, USA
| | - Hassina Z Bilheux
- Oak Ridge National Laboratory, Spallation Neutron Source, Neutron Scattering Division, Oak Ridge, Tennessee 37831, USA
| | - Jiao Y Y Lin
- Oak Ridge National Laboratory, Second Target Station Project, Oak Ridge, Tennessee 37831, USA
| | - George J Nelson
- Mechanical and Aerospace Engineering, University of Alabama-Huntsville, Huntsville, Alabama 35899, USA
| | - Andrew M Kiss
- Brookhaven National Laboratory, National Synchrotron Light Source II, Photon Science Division, Upton, New York 11973, USA
| | | | - Matthew J Connolly
- Material Measurement Laboratory/Applied Chemicals and Materials Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - Alexander M Long
- Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico 87545, USA
| | - Anton S Tremsin
- Space Science Laboratory, University of California-Berkeley, Berkeley, California 94720, USA
| | - Andrea Strzelec
- College of Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Mark H Anderson
- College of Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Robert Agasie
- College of Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
| | - Charles E A Finney
- Oak Ridge National Laboratory, Buildings and Transportation Science Division, Oak Ridge, Tennessee 37831, USA
| | - Martin L Wissink
- Oak Ridge National Laboratory, Buildings and Transportation Science Division, Oak Ridge, Tennessee 37831, USA
| | - Mija H Hubler
- College of Engineering and Applied Science, University of Colorado-Boulder, Boulder, Colorado 80309, USA
| | - Roland J-M Pellenq
- International Research Laboratory, CNRS-George Washington University, Washington, District of Columbia 20052, USA
| | - Claire E White
- Civil and Environmental Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Brent J Heuser
- The Grainger College of Engineering, University of Illinois-Urbana Champaign, Urbana, Illinois 61801, USA
| | - Aaron E Craft
- Idaho National Laboratory, Characterization and Advanced Post-Irradiation Examination Division, Idaho Falls, Idaho 83415, USA
| | - Jason M Harp
- Oak Ridge National Laboratory, Nuclear Energy and Fuel Cycle Division, Oak Ridge, Tennessee 37831, USA
| | - Chuting Tan
- Idaho National Laboratory, Characterization and Advanced Post-Irradiation Examination Division, Idaho Falls, Idaho 83415, USA
| | | | - Ann Junghans
- Los Alamos National Laboratory, Nuclear Engineering and Nonproliferation Division, Los Alamos, New Mexico 87545, USA
| | - Sanna Sevanto
- Los Alamos National Laboratory, Environmental Sciences Division, Los Alamos, New Mexico 87545, USA
| | - Jeffrey M Warren
- Oak Ridge National Laboratory, Environmental Sciences Division, Oak Ridge, Tennessee 37831, USA
| | - Fernando L Esteban Florez
- University of Oklahoma Health Sciences Center College of Dentistry, Oklahoma City, Oklahoma 73117, USA
| | - Alexandru S Biris
- Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, Little Rock, Arkansas 72204, USA
| | - Maria Cekanova
- Integrity Laboratories, LLC, Knoxville, Tennessee 37932, USA
| | - Nikolay Kardjilov
- Helmholtz-Zentrum-Berlin, Institute Applied Materials, Berlin 14109, Germany
| | | | - Matthew J Frost
- Oak Ridge National Laboratory, Neutron Technologies Division, Oak Ridge, Tennessee 37831, USA
| | - Sven C Vogel
- Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, New Mexico 87545, USA
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5
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Kuhn SJ, McKay S, Li F, Dalgliesh RM, Dees E, Burrage K, Shen J, Pynn R. Correcting aberrations of a transverse-field neutron resonance spin echo instrument. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:033901. [PMID: 37012763 DOI: 10.1063/5.0128097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 01/21/2023] [Indexed: 06/19/2023]
Abstract
Neutron resonance spin echo (NRSE) technique has the potential to increase the Fourier time and energy resolution in neutron scattering by using radio frequency (rf) neutron spin-flippers. However, aberrations arising from variations in the neutron path length between the rf flippers reduce the polarization. Here, we develop and test a transverse static-field magnet, a series of which are placed between the rf flippers, to correct for these aberrations. The prototype correction magnet was both simulated in an NRSE beamline using McStas, a Monte Carlo neutron ray-tracing software package, and measured using neutrons. The results from the prototype demonstrate that this static-field design corrects for transverse-field NRSE aberrations.
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Affiliation(s)
- Stephen J Kuhn
- Department of Physics, Indiana University, Bloomington, Indiana 47408, USA
| | - Sam McKay
- Department of Physics, Indiana University, Bloomington, Indiana 47408, USA
| | - Fankang Li
- Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - Robert M Dalgliesh
- ISIS, Rutherford Appleton Laboratory, Chilton, Oxfordshire, United Kingdom
| | - Eric Dees
- Department of Physics, Indiana University, Bloomington, Indiana 47408, USA
| | - Kaleb Burrage
- Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
| | - Jiazhou Shen
- Department of Physics, Indiana University, Bloomington, Indiana 47408, USA
| | - Roger Pynn
- Department of Physics, Indiana University, Bloomington, Indiana 47408, USA
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6
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Ankner JF, Ashkar R, Browning JF, Charlton TR, Doucet M, Halbert CE, Islam F, Karim A, Kharlampieva E, Kilbey SM, Lin JYY, Phan MD, Smith GS, Sukhishvili SA, Thermer R, Veith GM, Watkins EB, Wilson D. Cinematic reflectometry using QIKR, the quite intense kinetics reflectometer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2023; 94:013302. [PMID: 36725568 DOI: 10.1063/5.0122279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 11/14/2022] [Indexed: 06/18/2023]
Abstract
The Quite Intense Kinetics Reflectometer (QIKR) will be a general-purpose, horizontal-sample-surface neutron reflectometer. Reflectometers measure the proportion of an incident probe beam reflected from a surface as a function of wavevector (momentum) transfer to infer the distribution and composition of matter near an interface. The unique scattering properties of neutrons make this technique especially useful in the study of soft matter, biomaterials, and materials used in energy storage. Exploiting the increased brilliance of the Spallation Neutron Source Second Target Station, QIKR will collect specular and off-specular reflectivity data faster than the best existing such machines. It will often be possible to collect complete specular reflectivity curves using a single instrument setting, enabling "cinematic" operation, wherein the user turns on the instrument and "films" the sample. Samples in time-dependent environments (e.g., temperature, electrochemical, or undergoing chemical alteration) will be observed in real time, in favorable cases with frame rates as fast as 1 Hz. Cinematic data acquisition promises to make time-dependent measurements routine, with time resolution specified during post-experiment data analysis. This capability will be deployed to observe such processes as in situ polymer diffusion, battery electrode charge-discharge cycles, hysteresis loops, and membrane protein insertion into lipid layers.
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Affiliation(s)
- J F Ankner
- Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R Ashkar
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - J F Browning
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T R Charlton
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Doucet
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C E Halbert
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - F Islam
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A Karim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA
| | - E Kharlampieva
- Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | - S M Kilbey
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J Y Y Lin
- Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M D Phan
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G S Smith
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - S A Sukhishvili
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
| | - R Thermer
- Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G M Veith
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E B Watkins
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D Wilson
- Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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7
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Sala G, Mourigal M, Boone C, Butch NP, Christianson AD, Delaire O, DeSantis AJ, Hart CL, Hermann RP, Huegle T, Kent DN, Lin JYY, Lumsden MD, Manley ME, Quirinale DG, Stone MB, Z Y. CHESS: The future direct geometry spectrometer at the second target station. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:065109. [PMID: 35778024 DOI: 10.1063/5.0089740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 05/25/2022] [Indexed: 06/15/2023]
Abstract
CHESS, chopper spectrometer examining small samples, is a planned direct geometry neutron chopper spectrometer designed to detect and analyze weak signals intrinsic to small cross sections (e.g., small mass, small magnetic moments, or neutron absorbing materials) in powders, liquids, and crystals. CHESS is optimized to enable transformative investigations of quantum materials, spin liquids, thermoelectrics, battery materials, and liquids. The broad dynamic range of the instrument is also well suited to study relaxation processes and excitations in soft and biological matter. The 15 Hz repetition rate of the Second Target Station at the Spallation Neutron Source enables the use of multiple incident energies within a single source pulse, greatly expanding the information gained in a single measurement. Furthermore, the high flux grants an enhanced capability for polarization analysis. This enables the separation of nuclear from magnetic scattering or coherent from incoherent scattering in hydrogenous materials over a large range of energy and momentum transfer. This paper presents optimizations and technical solutions to address the key requirements envisioned in the science case and the anticipated uses of this instrument.
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Affiliation(s)
- G Sala
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M Mourigal
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - C Boone
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N P Butch
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - A D Christianson
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - O Delaire
- Department of Physics, Duke University, Durham, North Carolina 27708, USA
| | - A J DeSantis
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C L Hart
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R P Hermann
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Huegle
- Neutron Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D N Kent
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Y Y Lin
- Spallation Neutron Source, Second Target Station, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M D Lumsden
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M E Manley
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D G Quirinale
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M B Stone
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Y Z
- Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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8
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Mamontov E, Boone C, Frost MJ, Herwig KW, Huegle T, Lin JYY, McCormick B, McHargue W, Stoica AD, Torres P, Turner W. A concept of a broadband inverted geometry spectrometer for the Second Target Station at the Spallation Neutron Source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:045101. [PMID: 35489951 DOI: 10.1063/5.0086451] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
BWAVES is an acronym for Broadband Wide-Angle VElocity Selector spectrometer, indicating that a novel WAVES (Wide-Angle VElocity Selector) device will be used to select the velocity/wavelength of the detected neutrons after they are scattered by the sample. We describe a conceptual design of BWAVES, a time-of-flight broadband inverted-geometry neutron spectrometer for the Second Target Station at the Spallation Neutron Source operated by Oak Ridge National Laboratory. Being the first inverted geometry spectrometer where the energy of the detected neutrons can be chosen by a WAVES device mechanically, irrespective of the limitations imposed by the crystal analyzers or filters, BWAVES will feature a uniquely broad, continuous dynamic range of measurable energy transfers, spanning 4.5 decades. This will enable measurements of both vibrational and relaxational excitations within the same, continuous scattering spectra. Novel approaches that are necessary for the implementation of a WAVES device at the BWAVES spectrometer will result in a spectrometer with the design and characteristics much different from those displayed by the neutron spectrometers in existence today.
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Affiliation(s)
- E Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C Boone
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M J Frost
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K W Herwig
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Huegle
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Y Y Lin
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - B McCormick
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W McHargue
- Neutron Technologies Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A D Stoica
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - P Torres
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - W Turner
- SNS Second Target Station Project, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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9
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Wuttke J, Cottrell S, Gonzalez MA, Kaestner A, Markvardsen A, Rod TH, Rozyczko P, Vardanyan G. Guidelines for collaborative development of sustainable data treatment software. JOURNAL OF NEUTRON RESEARCH 2022. [DOI: 10.3233/jnr-220002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Software development for data reduction and analysis at large research facilities is increasingly professionalized, and internationally coordinated. To foster software quality and sustainability, and to facilitate collaboration, representatives from software groups of European neutron and muon facilities have agreed on a set of guidelines for development practices, infrastructure, and functional and non-functional product properties. These guidelines have been derived from actual practices in software projects from the EU funded consortium ‘Science and Innovation with Neutrons in Europe in 2020’ (SINE2020), and have been enriched through extensive literature review. Besides guiding the work of the professional software engineers in our computing groups, we hope to influence scientists who are willing to contribute their own data treatment software to our community. Moreover, this work may also provide inspiration to scientific software development beyond the neutron and muon field.
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Affiliation(s)
- Joachim Wuttke
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at Heinz Maier Leibnitz-Zentrum, Lichtenbergstraße 1, 85748 Garching, Germany
| | - Stephen Cottrell
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Miguel A. Gonzalez
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Anders Kaestner
- Paul Scherrer Institute, Forschungsstrasse 111, CH-5232 Villigen PSI, Switzerland
| | - Anders Markvardsen
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Thomas H. Rod
- European Spallation Source ERIC, PO BOX 176, SE-221 00 Lund, Sweden
| | - Piotr Rozyczko
- European Spallation Source ERIC, PO BOX 176, SE-221 00 Lund, Sweden
| | - Gagik Vardanyan
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
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10
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Mamontov E, Bordallo HN, Delaire O, Nickels J, Peters J, Schneider GJ, Smith JC, Sokolov AP. Broadband Wide-Angle VElocity Selector (BWAVES) neutron spectrometer designed for the SNS Second Target Station. EPJ WEB OF CONFERENCES 2022. [DOI: 10.1051/epjconf/202227202003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A recently proposed wide-angle velocity selector (WAVES) device for choosing the velocity of detected neutrons after they have been scattered by the sample paves the way for inverted geometry neutron spectrometers with continuously adjustable final neutron wavelength. BWAVES broadband inverted geometry spectrometer proposed for the Second Target Station at the Spallation Neutron Source at Oak Ridge National Laboratory is designed using WAVES to simultaneously probe dynamic processes spanning 4.5 decades in time (energy transfer). This makes BWAVES a uniquely flexible instrument which can be viewed as either a quasielasitc neutron scattering (QENS) spectrometer with a practically unlimited (overlapping with the vibrational excitations) range of energy transfers, or a broadband inelastic vibrational neutron spectrometer with QENS capabilities, including a range of accessible momentum transfer (Q) and a sufficiently high energy resolution at the elastic line. The new capabilities offered by BWAVES will expand the application of neutron scattering in ways not possible with existing neutron spectrometers.
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11
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Nemkovski K, Bewley R, García Sakai V, Nilsen GJ, Perrichon A, Silverwood I. SHERPA: A Spectrometer with High Energy Resolution and Polarisation Analysis. EPJ WEB OF CONFERENCES 2022. [DOI: 10.1051/epjconf/202227202004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
SHERPA is a proposed quasielastic neutron spectrometer with polarisation analysis, intended to replace the ageing Iris instrument at the ISIS neutron and muon source. In this paper we present a concept of the instrument along with Monte-Carlo simulations and analysis of possible instrument location. We expect greatly increased count rate compared to Iris (expected from 49 to 660 × Iris) in unpolarised mode and dedicated polarisation analysis capabilities at a more modest count rate increase (~5-70 × Iris). This huge gain in the count rate would be achieved from the combination of three factors: modern neutron guide with high-m coating, and prismatic effect and larger solid angle coverage at the energy analyser. Such an instrument would be the first of its kind and has incredible potential to revolutionise quasielastic neutron scattering technique through the separation of the coherent and incoherent scattering contributions.
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Kajimoto R, Nakamura M, Kamazawa K, Inamura Y, Iida K, Ikeuchi K, Ishikado M. Possible future upgrades of the direct-geometry chopper spectrometer 4SEASONS. EPJ WEB OF CONFERENCES 2022. [DOI: 10.1051/epjconf/202227202007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
4SEASONS is a direct geometry time-of-flight spectrometer installed in the Materials and Life Science Experimental Facility, the Japan Proton Accelerator Research Complex. It is used to study atomic and spin dynamics in the energy range of 100 meV to 102 meV. Since more than a decade has crossed after the first inelastic scattering experiment, it is essential to consider upgrading the instrument to improve its flexibility and performance. In this paper, we discuss the possible medium-term upgrades of key components of the instrument like the chopper system, which are achievable with the current technology and at reasonable cost. Herein, we demonstrated that 4SEASONS can improve the energy resolution by a factor of two, remove frame overlap of adjacent incident energies, significantly improve the asymmetry in the pulse shape, and increase the flux by a factor of ∼1.5, without major technical difficulties.
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Leiner JC, Franz C, Jochum JK, Pfleiderer C. MIASANS at the longitudinal neutron resonant spin-echo spectrometer RESEDA. EPJ WEB OF CONFERENCES 2022. [DOI: 10.1051/epjconf/202227202008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The RESEDA (Resonant Spin-Echo for Diverse Applications) instrument has been optimized for neutron scattering measurements of quasi-elastic and inelastic processes over a wide parameter range. One spectrometer arm of RESEDA is configured for the MIEZE (Modulation of Intensity with Zero Effort) technique, where the measured signal is an oscillation in neutron intensity over time prepared by two precisely tuned radio-frequency (RF) flippers. With MIEZE, all spin-manipulations are performed before the beam reaches the sample, and thus the signal from sample scattering is not disrupted by any depolarizing conditions there (i.e. magnetic materials and fields). The MIEZE spectrometer is being further optimized for the requirements of small angle neutron scattering (MIASANS), a versatile combination of the spatial and dynamical resolving power of both techniques. We present the current status of (i) the newly installed superconducting solenoids as part of the RF flippers to significantly extend the dynamic range (ii) the development and installation of a new detector on a translation stage within a new larger SANS-type vacuum vessel for flexibility with angular coverage and resolution, and (iii) the efforts to reduce background.
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Metz PC, Huegle T, Olds D, Page K. Simulating and benchmarking neutron total scattering instrumentation from inception of events to reduced and fitted data. J Appl Crystallogr 2021. [DOI: 10.1107/s1600576721004787] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
In the design and realization of modern neutron scattering instrumentation, particularly when designing beamline concepts from the ground up, it is desirable to fully benchmark against realistically simulated data. This is especially true for total scattering beamlines, where the future deliverable data is to be analysed in both reciprocal- and real-space representations, and needs must be carefully balanced to ensure sufficient range, resolution and flux of the instrument. An approach to optimize the design of neutron scattering instrumentation via a workflow including ray-tracing simulations, event-based data reduction, heuristic analysis and fitting against realistically simulated spectra is demonstrated here. The case of the DISCOVER beamline concept at the Spallation Neutron Source is used as an example. The results of the calculations are benchmarked through simulation of existing instrumentation and subsequent direct comparison with measured data. On the basis of the validated models, the ability to explore design characteristics for future beamline concepts or future instrument improvements is demonstrated through the examples of detector tube size and detector layout.
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