Virtual experiments: the ultimate aim of neutron ray-tracing simulations

Lefmann, Kim; Willendrup, Peter Kjær; Udby, Linda; Lebech, B.; Mortensen, K.; Birk, Jonas Okkels; Klenø, Kaspar Hewitt; Knudsen, Erik Bergbäck; Christiansen, Peter Leth; Šaroun, Jan; Kulda, J.; Filges, Uwe; Könnecke, Mark; Tregenna‐Piggott, Philip L. W.; Peters, Judith; Lieutenant, K.; Zsigmond, G.; Bentley, P. J.; Farhi, Emmanuel

doi:10.1080/10238160902819684

Cited by 31 publications

(18 citation statements)

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“…Following [8], a neutron scattering Virtual Experiment is a simulation which: 1. models a complete instrument, including a detailed sample description, 2. provides absolute intensity results that compare with actual measurements, and 3. can be controlled like a real instrument. The key point in these requirements is certainly the availability of advanced and accurate sample and neutron optics descriptions.…”

Section: Definition Of Virtual Experimentsmentioning

confidence: 99%

Virtual experiments in a nutshell: Simulating neutron scattering from materials within instruments with McStas

Farhi

Willendrup

2011

Journées de la Neutronique

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Abstract. We introduce Monte-Carlo methods for neutron scattering with step-by-step examples, using the McStas simulation tool. A selection of neutron instrument components are presented, as well as available sample scattering kernels. All these parts are assembled into more advanced instrument models in order to produce so-called virtual experiments, that is simulations which produce results comparable with experiments. Ways to couple such simulations with other simulation software including molecular dynamics are discussed.

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Section: Definition Of Virtual Experimentsmentioning

confidence: 99%

Virtual experiments in a nutshell: Simulating neutron scattering from materials within instruments with McStas

Farhi

Willendrup

2011

Journées de la Neutronique

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“…The software features a GUI interface that serves as an access point for new users and command-line input for more experienced users. The simple structure of the code procedure and the important benefit in being open source makes it the most used neutron ray-tracing software (Lefmann et al 2008). Since the release of McStas more and more components are added to the catalogue.…”

Section: Virtual Experiments For Researchersmentioning

confidence: 99%

“…While this article will focus on student use of virtual experiments, it is worth noting that experienced neutron scattering scientists also make use of virtual experiments via Monte Carlo based neutron ray-tracing (Lefmann et al 2008, Udby et al 2011. A convenient piece of software to construct the virtual experiments in is called McStas (Lefmann and Nielsen 1999).…”

Section: Virtual Experiments For Researchersmentioning

confidence: 99%

Virtual neutron scattering experiments - Training and preparing students for large-scale facility experiments

Overgaard

Bruun²,

May

et al. 2016

LOM

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Vi beskriver, hvordan virtuelle eksperimenter kan udnyttes i et laeringsdesign ved at forberede de studerende til hands-on-eksperimenter ved storskalafaciliteter. Vi illustrerer designet ved at vise, hvordan virtuelle eksperimenter bruges på Niels Bohr Institutets kandidatkursus om neutronspredning. I den sidste uge af kurset, rejser studerende til et storskala neutronspredningsfacilitet for at udføre neutronspredningseksperimenter. Vi bruger studerendes udsagn om deres oplevelser til at argumentere for, at arbejdet med virtuelle experimenter forbereder de studerende til at engagere sig mere frugtbart med eksperimenter ved at lade dem fokusere på fysikken og relevante data i stedet for instrumenternes funktion. Vi haevder, at det er, fordi de kan overføre deres erfaringer med virtuelle eksperimenter til rigtige eksperimenter. Vi finder dog, at laering stadig er situeret i den forstand, at kun kendskab til bestemte eksperimenter overføres. Vi afslutter med at diskutere de muligheder, som virtuelle eksperimenter giver. AbstractWe describe how virtual experiments can be utilized in a learning design that prepares students for hands-on experiments at large-scale facilities. We illustrate the design by showing how virtual experiments are used at the Niels Bohr Institute in a master level course on neutron scattering. In the last week of the course, students travel to a large-scale neutron scattering facility to perform real neutron scattering experiments. Through student interviews and survey answers, we argue, that the virtual training prepares the students to engage more fruitfully with experiments by letting them focus on physics and data rather than the overwhelming instrumentation. We argue that this is because they can transfer their virtual experimental experience to the real-life situation. However, we also find that learning is still situated in the sense that only knowledge of particular experiments is transferred. We proceed to discuss the affordances of virtual experiments.

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“…Virtual experiments 19) were performed by placing a sample in the beam, with the scattered neutrons measured by a detector 4 m from the sample, orthogonal to the beam. The detector measures the arrival time of the neutron, and then calculates its perceived energy, from the time it took from the opening of the chopper to the neutron reached the detector.…”

Section: Virtual Experimentsmentioning

confidence: 99%

Thermal Chopper Spectrometer for the European Spallation Source

Klenø

Lefmann

2011

J. Phys. Soc. Jpn.

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One of the instruments being considered for the ESS is a thermal chopper spectrometer, intended for the study of lattice vibrations and magnetic excitations. However, as the ESS will be a long pulsed source, we propose a very long instrument (180 m -300 m). We here present a guide system that can achieve a flux of 3.47×10 8 n/s/cm 2 and a resolution of dE/E = 5.3% for 1 Å neutrons on the sample with a transport efficiency of 80%. Furthermore, we demonstrate the efficiency of the instrument using a virtual experiment measuring an elastic line width.

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Virtual experiments: the ultimate aim of neutron ray-tracing simulations

Cited by 31 publications

References 0 publications

Virtual experiments in a nutshell: Simulating neutron scattering from materials within instruments with McStas

Virtual experiments in a nutshell: Simulating neutron scattering from materials within instruments with McStas

Virtual neutron scattering experiments - Training and preparing students for large-scale facility experiments

Thermal Chopper Spectrometer for the European Spallation Source

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