scholarly journals Development of high intensity neutron source at the European Spallation Source

2020 ◽  
Vol 22 (2-3) ◽  
pp. 209-219
Author(s):  
V. Santoro ◽  
K.H. Andersen ◽  
D.D. DiJulio ◽  
E.B. Klinkby ◽  
T.M. Miller ◽  
...  
Keyword(s):  
Neutron Source ◽  
High Intensity ◽  
Spin Echo ◽  
Laws Of Nature ◽  
High Brightness ◽  
Spallation Target ◽  
Target Station ◽  
Secondary Sources ◽  
Cold Neutrons ◽  
Spallation Source

The European Spallation Source being constructed in Lund, Sweden will provide the user community with a neutron source of unprecedented brightness. By 2025, a suite of 15 instruments will be served by a high-brightness moderator system placed above the spallation target. The ESS infrastructure, consisting of the proton linac, the target station, and the instrument halls, allows for implementation of a second source below the spallation target. We propose to develop a second neutron source with a high-intensity moderator able to (1) deliver a larger total cold neutron flux, (2) provide high intensities at longer wavelengths in the spectral regions of Cold (4–10 Å), Very Cold (10–40 Å), and Ultra Cold (several 100 Å) neutrons, as opposed to Thermal and Cold neutrons delivered by the top moderator. Offering both unprecedented brilliance, flux, and spectral range in a single facility, this upgrade will make ESS the most versatile neutron source in the world and will further strengthen the leadership of Europe in neutron science. The new source will boost several areas of condensed matter research such as imaging and spin-echo, and will provide outstanding opportunities in fundamental physics investigations of the laws of nature at a precision unattainable anywhere else. At the heart of the proposed system is a volumetric liquid deuterium moderator. Based on proven technology, its performance will be optimized in a detailed engineering study. This moderator will be complemented by secondary sources to provide intense beams of Very- and Ultra-Cold Neutrons.

scholarly journals Cryogenic design for a high intensity ultracold neutron source at TRIUMF

2019 ◽  
Vol 219 ◽  
pp. 10001
Author(s):  
Shinsuke Kawasaki ◽  
Takahiro Okamura ◽  
Keyword(s):  
Heat Transport ◽  
Neutron Source ◽  
Superfluid Helium ◽  
High Intensity ◽  
Cold Neutron ◽  
Spallation Neutron Source ◽  
Cold Neutrons ◽  
Kapitza Conductance ◽  
Neutron Converter ◽  
Ultra Cold Neutron

The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration has been developing a source of high-intensity ultra-cold neutrons for use in a neutron electric dipole search. The source is composed of a spallation neutron source and a superfluid helium ultra-cold neutron converter, surrounded by a cold moderator. The temperature of the superfluid helium needs to be maintained at approximately 1.0 K to suppress up-scattering by phonons. The Kapitza conductance and the heat transport by the superfluid helium are key parameters which need to be well characterized. We have therefore investigated them in first experiments. Current efforts are directed at optimizing the design of the helium cryostat.

scholarly journals Optimization of moderators and beam extraction at the ESS

2018 ◽  
Vol 51 (2) ◽  
pp. 264-281 ◽  
Author(s):  
Ken Holst Andersen ◽  
Mads Bertelsen ◽  
Luca Zanini ◽  
Esben Bryndt Klinkby ◽  
Troels Schönfeldt ◽  
...  
Keyword(s):  
Neutron Source ◽  
Free Choice ◽  
Cold Neutron ◽  
Condensed Matter ◽  
Beam Extraction ◽  
High Brightness ◽  
Cold Neutron Source ◽  
Technical Design Report ◽  
Spallation Source ◽  
Low Dimensional

A global approach coupling the moderator to the beam extraction system has been applied for the design optimization of the thermal and cold moderators of the European Spallation Source (ESS), which will be the brightest neutron source in the world for condensed-matter studies. The design is based on the recently developed high-brightness low-dimensional moderator concepts.Para-hydrogen is used for the cold neutron source, while thermal neutrons are provided by moderation in water. The overall moderation configuration was chosen in order to satisfy a range of requirements on bispectral extraction, beamport configuration and instrument performance. All instruments are served by a single moderator assembly above the target, arranged in a `butterfly' geometry with a height of 3 cm. This was determined to be the optimal height for trade-off between high brightness and efficient guide illumination, by analysis of the performance of 23 instruments, based on the reference suite of the ESS Technical Design Report. The concept of `brilliance transfer' is introduced to quantify the performance of the neutron optical system from the source to the sample. The target monolith incorporates a grid of 42 neutron beamports with an average separation of 6°, allowing a free choice between cold and thermal neutron sources at all instrument positions. With the large number of beamports and the space below the target available for future moderators, ample opportunities are available for future upgrades.

High Intensity Accelerator and Neutron Source in China

2011 ◽  
Author(s):  
Xialing Guan ◽  
J. Wei ◽  
Chun Loong ◽  
Dugersuren Dashdorj ◽  
Gary E. Mitchell
Keyword(s):  
Neutron Source ◽  
High Intensity

The Spallation Neutron Source High Power Target Station Moderator Performance: Calculations and Studies

2003 ◽  
Vol 11 (1-2) ◽  
pp. 83-91 ◽  
Author(s):  
E.B. Iverson ◽  
P.D. Ferguson ◽  
F.X. Gallmeier ◽  
B.D. Murphy
Keyword(s):  
Neutron Source ◽  
High Power ◽  
Spallation Neutron Source ◽  
Target Station ◽  
High Power Target

scholarly journals A simulational study of the indirect-geometry neutron spectrometer BIFROST at the European Spallation Source, from neutron source position to detector position

2021 ◽  
Vol 54 (1) ◽  
pp. 263-279
Author(s):  
M. Klausz ◽  
K. Kanaki ◽  
T. Kittelmann ◽  
R. Toft-Petersen ◽  
J. O. Birk ◽  
...  
Keyword(s):  
Neutron Source ◽  
Neutron Transport ◽  
Rate Capability ◽  
Simulation Software ◽  
Neutron Spectrometer ◽  
Instantaneous Rate ◽  
Simulation Tools ◽  
Detector Position ◽  
Spallation Source ◽  
Incident Rates

The European Spallation Source (ESS) is intended to become the most powerful spallation neutron source in the world and the flagship of neutron science in upcoming decades. The exceptionally high neutron flux will provide unique opportunities for scientific experiments but also set high requirements for the detectors. One of the most challenging aspects is the rate capability and in particular the peak instantaneous rate capability, i.e. the number of neutrons hitting the detector per channel or cm2 at the peak of the neutron pulse. The primary purpose of this paper is to estimate the incident rates that are anticipated for the BIFROST instrument planned for ESS, and also to demonstrate the use of powerful simulation tools for the correct interpretation of neutron transport in crystalline materials. A full simulation model of the instrument from source to detector position, implemented with the use of multiple simulation software packages, is presented. For a single detector tube, instantaneous incident rates with a maximum of 1.7 GHz for a Bragg peak from a single crystal and 0.3 MHz for a vanadium sample are found. This paper also includes the first application of a new pyrolytic graphite model and a comparison of different simulation tools to highlight their strengths and weaknesses.

The dense plasma focus — A high intensity neutron source

1977 ◽  
Vol 145 (1) ◽  
pp. 191-218 ◽  
Author(s):  
A. Bernard ◽  
P. Cloth ◽  
H. Conrads ◽  
A. Coudeville ◽  
G. Gourlan ◽  
...  
Keyword(s):  
Neutron Source ◽  
Plasma Focus ◽  
High Intensity ◽  
Dense Plasma ◽  
Dense Plasma Focus
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