scholarly journals Slab geometry type cold neutron moderator development based on neutronic study for Riken Accelerator-driven compact Neutron Source (RANS)

2020 ◽  
Vol 231 ◽  
pp. 04004
Author(s):  
Baolong Ma ◽  
Yujiro Ikeda ◽  
Yoshie Otake ◽  
Makoto Teshigawara ◽  
Yasuo Wakabayashi ◽  
...  
Keyword(s):  
Neutron Source ◽  
Room Temperature ◽  
Cold Neutron ◽  
High Energy ◽  
Material Research ◽  
Slab Geometry ◽  
Simulation Code ◽  
Cold Neutrons ◽  
Neutron Moderator ◽  
Pulsed Neutron

Cold neutrons with energy less than several meV are good probes for material research, and they have been available on large neutron facilities, whereas it is not commonly available on compact accelerator-driven neutron source. RIKEN Accelerator-driven Neutron Source (RANS) is a pulsed neutron facility which provides thermal neutrons and high energy neutrons at several MeV. We started a project to implement a cold neutron moderator for RANS to broaden cold neutrons applications. A cold neutron moderator system with a mesitylene moderator at 20K and a polyethylene pre-moderator at room temperature in the slab geometry was designed for RANS. So far, the thickness of the pre-moderator and mesitylene have been optimized to get the highest cold neutron flux by using a Monte Carlo simulation code, PHITS. Graphite reflector dimensions were also proven to have significant effect to increase the cold neutron intensity.

Neutron Transmission of a Single-Crystal MgO Filter

1998 ◽  
Vol 31 (6) ◽  
pp. 841-844 ◽  
Author(s):  
P. Thiyagarajan ◽  
R. K. Crawford ◽  
D. F. R. Mildner
Keyword(s):  
Single Crystal ◽  
Liquid Nitrogen ◽  
Neutron Source ◽  
Room Temperature ◽  
Transmission Probability ◽  
Neutron Transmission ◽  
Absorption Probability ◽  
Cold Neutrons ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

The neutron transmission probability through a single-crystal MgO filter has been measured at both liquid-nitrogen (77 K) and room (300 K) temperatures, as a function of wavelength, using a pulsed neutron source. The data show that a cooled MgO filter is superior to room-temperature sapphire for both thermal and cold neutrons, principally because the absorption probability is reduced by a factor of three at long wavelengths.

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.

Design of the Moderator and Cryogenic System for Generating Cold-Neutrons at the CPHS

2010 ◽  
Author(s):  
Qixi Feng ◽  
Quanke Feng ◽  
Bin Zhong ◽  
Tianjiao Liang ◽  
Takeshi Kawai ◽  
...  
Keyword(s):  
Neutron Source ◽  
Cold Neutron ◽  
Cryogenic System ◽  
Good Resolution ◽  
Neutron Generation ◽  
Design And Optimization ◽  
Cold Neutrons ◽  
Operation Conditions ◽  
Characterization Of Materials ◽  
Soft Matters

The Compact Pulsed Hadron Source (CPHS) of Tsinghua University will produce neutrons by the Be(n,p) reaction through bombarding a proton beam with 13MeV/50Hz/1.25mA from a LINAC system on a beryllium target. One of the purposes of this neutron source facility is to provide the neutron scattering capability for characterization of materials, especially soft matters and biological systems. Cold neutrons (wavelength > 4 Å) are essential to characterize the structure of these materials over the length scale of ∼100 nm with good resolution. We discuss the design and optimization of a cold neutron source (CNS) which employs a solid methane moderator for cold neutron generation. The moderator configuration, the associated cryogenic system, and operation conditions will be discussed.

Operation of a superthermal ultra-cold neutron source and the storage of ultra-cold neutrons in superfluid Helium4

1983 ◽  
Vol 51 (3) ◽  
pp. 187-193 ◽  
Author(s):  
R. Golub ◽  
C. Jewell ◽  
P. Ageron ◽  
W. Mampe ◽  
B. Heckel ◽  
...  
Keyword(s):  
Neutron Source ◽  
Cold Neutron ◽  
Cold Neutrons ◽  
Cold Neutron Source ◽  
Ultra Cold Neutron

High energy vibrational spectroscopy on a pulsed neutron source

1978 ◽  
Vol 154 (2) ◽  
pp. 349-360 ◽  
Author(s):  
B.C. Boland ◽  
D.F.R. Mildner ◽  
G.C. Stirling ◽  
L.J. Bunce ◽  
R.N. Sinclair ◽  
...  
Keyword(s):  
Neutron Source ◽  
Vibrational Spectroscopy ◽  
High Energy ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

The U. K. Spallation Neutron Source

1980 ◽  
Vol 290 (1043) ◽  
pp. 657-672 ◽  
Keyword(s):  
Neutron Source ◽  
Amorphous Materials ◽  
Molecular Spectroscopy ◽  
High Energy ◽  
Fast Neutrons ◽  
Spallation Neutron Source ◽  
Crystalline Materials ◽  
Epithermal Neutrons ◽  
Under Construction ◽  
Pulsed Neutron

Pulsed neutron sources offer an attractive route for the realization of effective fluxes greater than those currently available from high flux reactors. The spallation neutron source now under construction at the Rutherford Laboratory will produce intense bursts of fast neutrons through interactions of 800 MeV protons with a heavy metal target. The fast neutrons are slowed down in nearby hydrogenous moderators viewed by some 20 time-of-flight neutron scattering instruments. The spectrum of the moderated neutrons is strongly enhanced in the high velocity region compared with that from a reactor. The new source will be comparable with the best beam reactors for experiments with neutrons of mid-thermal energy, and will provide unrivalled potential for use of the epithermal neutrons. Areas of science that will benefit immediately are the study of liquids and amorphous materials, high energy excitations in crystalline materials, molecular spectroscopy, surface phenomena and kinetic processes, as well as a range of crystallographic applications.

Cold neutron beams at the Intense Pulsed Neutron Source

1997 ◽  
Vol 241-243 ◽  
pp. 33-35 ◽  
Author(s):  
E.B Iverson ◽  
J.M Carpenter ◽  
E.J Hill
Keyword(s):  
Neutron Source ◽  
Cold Neutron ◽  
Neutron Beams ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

scholarly journals LUE-200 Accelerator—A Photo-neutron Generator For The Pulsed Neutron Source “IREN”

2020 ◽  
Vol 15 (11) ◽  
pp. T11006-T11006
Author(s):  
A. Sumbaev ◽  
V. Kobets ◽  
V. Shvetsov ◽  
N. Dikansky ◽  
P. Logatchov
Keyword(s):  
Neutron Source ◽  
Neutron Generator ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

scholarly journals Research Progress toward Room Temperature Sodium Sulfur Batteries: A Review

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1535
Author(s):  
Yanjie Wang ◽  
Yingjie Zhang ◽  
Hongyu Cheng ◽  
Zhicong Ni ◽  
Ying Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Room Temperature ◽  
High Energy ◽  
Safety Performance ◽  
High Energy Density ◽  
Research Progress ◽  
Storage Performance ◽  
Sulfur Battery ◽  
Sodium Sulfur Battery ◽  
Sodium Sulfur

Lithium metal batteries have achieved large-scale application, but still have limitations such as poor safety performance and high cost, and limited lithium resources limit the production of lithium batteries. The construction of these devices is also hampered by limited lithium supplies. Therefore, it is particularly important to find alternative metals for lithium replacement. Sodium has the properties of rich in content, low cost and ability to provide high voltage, which makes it an ideal substitute for lithium. Sulfur-based materials have attributes of high energy density, high theoretical specific capacity and are easily oxidized. They may be used as cathodes matched with sodium anodes to form a sodium-sulfur battery. Traditional sodium-sulfur batteries are used at a temperature of about 300 °C. In order to solve problems associated with flammability, explosiveness and energy loss caused by high-temperature use conditions, most research is now focused on the development of room temperature sodium-sulfur batteries. Regardless of safety performance or energy storage performance, room temperature sodium-sulfur batteries have great potential as next-generation secondary batteries. This article summarizes the working principle and existing problems for room temperature sodium-sulfur battery, and summarizes the methods necessary to solve key scientific problems to improve the comprehensive energy storage performance of sodium-sulfur battery from four aspects: cathode, anode, electrolyte and separator.

Sign in / Sign up

Export Citation Format

Share Document