Conveners
Instruments: Novel Spectrometers
- Georg Ehlers (Oak Ridge National Laboratory)
Instruments: Novel Instrumentation II
- Christian Rรผegg (Paul Scherrer Institute)
Instruments: Detectors
- Paul Henry (ISIS Neutron & Muon Source)
Instruments: Polarization
- Ken Andersen (ESS)
Instruments: Novel Instrumentation III
- Thomas Gutberlet (Forschungszentrum Jรผlich GmbH)
Instruments: Optics
- Uwe Filges
Instruments: Sample Environment
- Christof Niedermayer (Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut)
CAMEA (Continuous Angle Multiple Energy Analysis) is a novel crystal analyzer concept optimized for detection efficiency in the horizontal scattering plane [1]. This is compatible with the geometrical restrictions imposed by extreme sample environments and enables rapid mapping of excitations. The design comprises consecutive, upward scattering analyzer arcs set to analyze different neutron...
CHESS is the new proposed direct geometry inelastic spectrometer dedicated to the analysis of small samples with modest energy resolution (2.5-5% of Ei). This relatively short instrument will take full advantage of both the increased peak brilliance of the SNS Second Target Station (STS) coupled moderators, and of the recent advances in instrument design and technology, to achieve...
We'll report the design of a direct-geometry spectrometer at CSNS
The high-resolution powder diffractometer (HRPD) at the ISIS neutron spallation source has been in operation for almost 35 years and remains one of the leading instruments of its kind in the world. With a 95 m primary flight path and backscattering detectors covering 2θ = 154โ176ยฐ the instrument achieves Δd/d โ 6x10โ4 for data focussed over the whole backscattering array...
Structure determination of materials on the atomic scale requires diffraction techniques and accurate structure is essential in order to understand physical properties. Neutron diffraction is complementary to X-ray diffraction but relies on large-scale neutron facilities, of which there are relatively few cf. X-ray sources, and the favourable properties of the neutron for material...
A two-dimensional (2D) Anger camera detector has been used at the HB-3A four-circle single-crystal neutron diffractometer at the High Flux Isotope Reactor (HFIR) since 2013. The 2D detector has enabled the capabilities of measuring sub-mm crystals and spin density maps, enhanced the efficiency of data collection and phase transition detection, and improved the signal-to-noise ratio. Recently,...
We have performed a series of experiments using both reactor based and spallation based neutron scattering instruments to characterize the suitability of different materials for neutron absorption. In particular, we characterize the usefulness of these materials in the near vicinity of the neutron beams used in neutron scattering instrumentation. We examine boron carbide based coatings as...
The neutron optics and polarization team operates development beamlines at the High Flux Isotope Reactor. The newest is the "Larmor" polarization development beamline at the CG4B guide position, commissioned in 2018. The first experiment on this beamline imaged He ions in turbulent flow. Measurements in the near future will include tests of resonant spin echo with superconducting rf...
The Multi-Grid detector was introduced at the ILL and developed in collaboration with the ESS over the past 8 years. This detector technology emerged as a consequence of the need to find alternatives to $^3$He in neutron scattering detectors, where the large area needed makes $^3$He detectors prohibitively expensive. It has seen been demonstrated that the Multi-Grid and other similar detectors...
High sensitivity CMOS cameras can collect neutron scintillation images at over 1000 fps. Individual neutron scintillation events can be pinpointed by a center-of-gravity image processing routine and a cumulative high-resolution image constructed using thousands of individual raw images. The time for such a data collection maybe 10 seconds but image processing on a CPU can take about 500 ms an...
Scintillation detectors using ZnS:Ag/$^6$LiF are currently used and being developed in a number of facilities such as J-PARC [1], SNS [2], CSNS [3] and ISIS[4]. At ISIS, these scintillation detectors have been employed for more than two decades and service approximately half of the instruments. There are currently three types of ZnS:Ag/$^6$LiF detectors in use on ISIS, scintillator viewed by...
Proportional Technologies, Inc. has previously developed a neutron imaging detector, based on boron-coated straws (BCS), a technology aimed to replace 3He tubes in large-scale neutron science instruments, like the Cold Neutron Chopper Spectrometer (CNCS) at the SNS (ORNL). That detector is composed of 1" tubes, each containing 7 straws. Each straw is 7.5 mm in diameter, and 1 m in active...
In order to make use of the high neutron flux expected at the European Spallation Source, alternatives to $^3$He based detectors are required. Furthermore, to maximise the benefit of the time-of-flight method, instruments at ESS will make use of a wide angular coverage of detectors. The LoKI SANS instrument is being developed in a collaboration between ESS and STFC and will make use of...
LET is a cold time-of-flight chopper spectrometer installed on the second target station at the ISIS facility. With nearly ฯ st. of continuous detector coverage, it is primarily used to map excitation spectra in single crystals of magnetic materials. Beyond this application, its high resolution makes it well suited for quasi-elastic scattering (QENS) studies of energy materials, soft matter,...
Polarized neutron analysis has been widely applied to position sensitive experiment method, such as small angle neutron scattering
- T. Wang, C. Y. Jiang, T. O. Farmer, L. Debeer-Schmitt, J. F. Wenzel, L. McDonald, J. L. Robertson, M. R. Fitzsimmsons, and X. Tong, Physica B 551, 492 (2018).
(SANS), neutron imaging
- I. Dhiman, R. Ziesche, T. H. Wang, H. Bilheux, L. Santodonato, X....
Despite the challenges, neutron resonance spin echo (NRSE) still holds the promise to improve upon neutron spin echo (NSE) for measurement of slow dynamics in materials. In particular, the modulated intensity with zero effort (MIEZE) configuration allows for the measurement of depolarizing samples and is naturally suited for combination with small angle neutron scattering (SANS) as a result of...
HYSPEC is a direct geometry spectrometer at the Spallation Neutron Source, with optional polarization analysis. The region around the sample is sufficiently configurable to accommodate a variety of polarization optics. Several optics have been prototyped, tested and in some cases implemented as part of HYSPECโs user program. Instrument upgrades and testing which did not introduce new optics...
The multi-purpose reflectometer (MR) at China spallation neutron source (CSNS) is an instrument optimized for examining thin films with nanometer scale structure, especially in regard to their magnetic properties with the removable polarized neutron components. The MR has 3 choppers and 4-m-long bender. The main frame of wavelength is 2-7 A. The first step of commission is finished in the end...
The design and development of the polychromatic beam reflectometer CANDOR (for Chromatic Analyzer Neutron Reflectometer Or Diffractometer) currently being commissioned at the NIST Center for Neutron Research is described. This includes the performance of an energy-dependent neutron detector which incorporates pyrolytic graphite analyzer crystals (54 separate elements in series) in conjunction...
We have been developing a magnetic imaging technique using pulsed polarized neutrons at the Materials and Life Science Experimental Facility (MLF) of J-PARC. In this method, we visualize magnetic field distributions in free space or within a material using wavelength-resolved polarization distribution images. The neutron spin experiences Larmor precession in a magnetic field, and its...
Magnetisation dynamics is a growing area of materials characterisation in thin film magnetism and is particular of interest for magnetic exchange spring systems which consist of alternating thin hard and soft magnetic layers provide a great potential in applications such as (i) permanent magnets and (ii) magnetic data storage and spintronic devices.
There is significant enthusiasm to...
Abstract
In the past several years, the CG-1D neutron imaging facility at the High Flux Isotope Reactor (HFIR), Oak Ridge National Laboratory (ORNL), has successfully provided unique insights in many research areas including energy storage, additive manufacturing, plant physiology, archeology, transportation, geology, etc. It has been recognized as a key neutron imaging user facility in...
In the development of the European Spallation Source, the engineering phase of the Neutron Beam Extraction System is approaching its end. Currently prototyping is ongoing to verify and increase the understanding of the manufacturing limitations in relation to the engineering aspects and beam extraction requirements from the instruments before the manufacturing of the suite of 16 neutron beam...
The advance in manufacturing of neutron supermirrors allows for an efficient brilliance transfer and a versatile design of the neutron transport system from moderator to the sample position. In the case of beam extraction from small moderators, as STS will provide, elliptical shaped supermirrors seem to be the optical element of choice. Here we describe an optical system consisting of two...
Co-authors: Uwe Filges1, Emmanouela Rantsiou1, Yutaka Yamagata2, and Takuya Hosobata2
1. Division Research with Neutrons and Muons (NUM), Paul Scherrer Institut, Villigen, Switzerland
2. RIKEN Center for Advanced Photonics, RIKEN, Saitama, Japan
Novel materials in strongly competitive fields such as nano-science or material science, are often only available in small volume in the order of 1...
Neutron scattering instruments require specific bandwidths and timing structures according to the experimental resolution conditions. Recent developments of compact accelerator based pulsed neutron sources (CANS) enable an individual optimization of the neutron energy spectrum and pulse timing. This allows a large flexibility to tailor the spectral and pulse properties according to the...
The National High Magnetic Field Laboratory has completed the highest field superconducting magnet worldwide, a 32 T system employing REBCO (Rare Earth Barium Copper Oxide) and traditional Nb3Sn and NbTi. This magnet was the product of an 8-year development effort and will be used for condensed matter physics experiments in Tallahassee, FL. Since then the NHMFL has initiated the development of...
Due to relatively low neutron fluxes, neutron experiments require sample volumes many orders of magnitude larger than comparable X-ray experiments. In the past, this need for large samples has severly limited the maximum pressures available for in situ neutron scattering. Although break-out experiments have been conducted, diffraction experiments are typically not conducted at pressures abvove...
Sample Environment for Soft Matter at ISIS
J. Vine D, R. Haynes, T. Charleston, A. Church, O. Kirichek
ISIS Facility, STFC, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, UK
Soft Matter is now well established within the ISIS Experimental Operations Division (IEOD) alongside Cryogenics, Pressure and High Temperature, where we are able to support user...
High-pressure science at the current generation of powerful spallation sources has provided a strong impetus towards increasingly tiny sample sizes. For example, high-pressure diffraction on the SNAP beamline at the SNS routinely employs samples with diameters of 500 ฮผm or less [1]. Furthermore, as these small samples are necessarily contained within relatively massive vessels, stringent...
The progress in sample environment at the China Spallation Neutron Source (CSNS) is presented. During the past years, the Sample Environment group has made substantial efforts towards the procurement, design, development and maintenance of a series of sample environments for the three commissioning instruments. The equipment includes cryostats, an 3He insert, magnets, furnaces,...
MIRACLES will be the neutron time-of-flight backscattering spectrometer at the European Spallation Source in Lund, Sweden.[1] This high-resolution spectrometer will display a best energy resolution of ฮด(~2.5 ฮผeV can be easily tuned to match the observation time of the system under study. Moreover, a unique dynamic range covering an energy transfer for quasielastic neutron scattering (QENS)...
POLANO is the chopper type spectrometer with a polarization analysis capability in the Materials and Life Science Experimental Facility (MLF), J-PARC. After several years spending for designing, manufacturing and construction of the spectrometer, we finally commenced the beam commissioning and a part of user program with unpolarized neutron beam condition. With using neutron beam, its...
Jalousie is a modularized neutron detector in production phase, developed to serve as alternative for classical $^3$He position sensitive detector tubes as used for large neutron scattering instruments. The design has been fully produced for the POWTEX instrument at FRM II, is now under production for DREAM and under design for MAGIC at ESS. The neutron converting material is 10Boron and...
Neutron spin echo (NSE) is a variation of neutron spectrometry for high-resolution inelastic and quasi-elastic neutron scattering methods [1]. Two types of NSE spectrometers, that is, a neutron resonance spin echo (NRSE) instrument and a modulated intensity by zero effort (MIEZE) instrument, have been installing into BL06 at Materials and Life Science Experimental Facility (MLF), Japan Proton...
