Neutron Position Sensitive Detectors for the ESS

1998

HYSPEC is a direct geometry spectrometer to be installed at the SNS [I] on beamline 14B where it will view a ciyogenic coupled hydrogen moderator, The 'hybrid' design combines time-of-Jlight spectroscopy with focusing Bragg optics to provide a high nionochroinaticfltrx on small single crystal samples, with a very low background at an extended detector bank. The instrument is optimized for an incident energy range of 3-9OmeK It will have a medium energy resolution (296610%) and will provide aJux on sample of the order of 106-107 neutrons/s-cm2. The spectrometer will be located in a satellite building outside the SNS experimental hall at the end of a 35m curved supermirror guide. A straight-slotted Fermi chopper will be used to monochromate the neutron beam and to determine the burst width. The I5cm high, 4cm wide beam will be focused onto a 2cm by 2cm area at the sample position using Bragg reJection >om one of two crystal arrays. For unpolarized neutron studies these will...

2008

In 2004, the Responsive Neutron Generator Product Deployment department embarked upon a partnership with the Systems Engineering and Analysis knowledge management (KM) team to develop knowledge management systems for the neutron generator (NG) community. This partnership continues today. The most recent challenge was to improve the current KM system (KMS) development approach by identifying a process that will allow staff members to capture knowledge as they learn it. This "as-you-go" approach will lead to a sustainable KM process for the NG community. This paper presents a historical overview of NG KMSs, as well as research conducted to move toward sustainable KM.

2012

The objective of the Events organised and presentations were twofold. On one hand we aimed at the effective dissemination and exploitation of the Links‐up project outcomes, on the other hand we aimed at involving stakeholders of the project and target groups via 'Learning Dialogues' and events to ensure sustainability on a long term. The primary target groups for the dissemination and exploitation activities have been targeted when organising and selecting events where Links‐up was presented: EU and national government agencies, policy‐makers; Learning and inclusion networks; training providers. Events started at an early stage of the project to ensure continuity and deeper involvement of target groups. Events included the three Learning Dialogues combined with national events and the Final Conference (reported separately) with intensive exchange of opinions and experiences using action learning set methodology and role‐plays.

2010

In 2004, the Responsive Neutron Generator Product Deployment department embarked upon a partnership with the Systems Engineering and Analysis knowledge management (KM) team to develop knowledge management systems for the neutron generator (NG) community. This partnership continues today. The most recent challenge was to improve the current KM system (KMS) development approach by identifying a process that will allow staff members to capture knowledge as they learn it. This "as-you-go" approach will lead to a sustainable KM process for the NG community. This paper presents a historical overview of NG KMSs, as well as research conducted to move toward sustainable KM.

2020

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 NCN...

Journal of Neutron Research

The European Spallation Source (ESS) 1 presently under construction in Lund, Sweden, is designed to become the most powerful facility ever built for research with neutrons. The source of neutrons has at its core a moderator system of unprecedented brightness, which is due to the adoption of the new concept of low-dimensional moderators (a factor 2.5 brighter than the conventional volume moderator initially foreseen for ESS). This moderator system, placed above the large rotating tungsten spallation target, will serve a suite of fifteen neutron scattering instruments which are presently being installed, aiming at starting the user program in 2027, before reaching the full scope of twenty-two instruments at a later date. The facility was designed with the provision for upgrades: a grid of forty-two beamports was built around the moderators, allowing for more instruments to be added to the suite in unoccupied locations. The possibility to install new instruments can profit from an additional degree of flexibility that was not present in the initial design of ESS: the initial design consisted of two identical, large-volume moderator systems, one above and one below the spallation target, which took all the space allocated around the target for the placement of neutron sources. The adoption of the novel design based on the low-dimensional moderator concept resulted not only in a brighter source, but also in a configuration where only a single moderator system, placed above the spallation target, was sufficient and optimal to serve all the instruments in the initial suite. This left the space below the target available for the placement of a new source. Allowing by design each of the forty-two beamports to view either the upper or lower moderator system, it increased the upgrade possibilities of ESS. A second source, with different characteristics from the first one, can now be designed and installed; the combination of two complementary moderator systems would then not only enhance the range of possibilities of ESS but even enable developments of new instrument concepts. The HighNESS project (development of High intensity Neutron source at the European Spallation Source) 2 is a three-years EU project whose main goal is to design such a second moderator system within the existing ESS infrastructure. It will provide an engineering study for a cold-neutron moderator, and technical design studies for sources of very cold neutrons (VCN) and ultra-cold neutrons (UCN). The complementarity of this moderator system to the upper, bi-spectral high-brightness moderator is twofold: first, its high total intensity of cold neutrons enables applications for which this parameter, rather than highest possible brightness, is of paramount importance; second, the extended long-wavelength capabilities generate opportunities to develop novel instrument concepts able to take advantage of VCN and for a next generation of projects with UCN. The first part of the HighNESS project, which started in October 2020, was dedicated to the design of an intense source of cold neutrons, based on a large-volume liquid deuterium moderator. For the tasks of designing VCN

Progress in Nuclear Energy, 1996

The Advanced Neutron Source (ANS) is a new experimental facility planned to meet the need for an intense steady-state source of neutrons. The facility will be build around a new research reactor with a fission power of about 330 MW, producing an unprecedented flux that will provide the most intense beams of steady-state neutrons in the world. This paper outlines the overall scientific mission and technical objectives of this project, defines the regulatory approach that is likely to be applied, and presents a summary of the facility layout, the major plant systems, and the reactor and experiment systems. Detailed discussions are then given related to the design of the reactor core and various options evaluated, and the approach taken on safety and severe accident analyses. A summary is also included on the topic of environmental compliance and several key aspects that must be addressed to ensure compliance in that area.

1999

This CRS report focuses on the Spallation Neutron Source (SNS), a new Department of Energy-funded research facility, which is scheduled for construction at the Oak Ridge National Laboratory in eastern Tennessee. The facility is intended to generate and use pulsed neutron beams to study the structural properties of a wide range of materials. The report describes the SNS's management, project costs, schedule, site selection, and funding, and discusses issues raised by some congressional critics of the project, such as management problems, potential cost overruns, and schedule delays. Technical information about the project as well as excerpts from relevant legislation are appended. The report will be updated as appropriate.