scholarly journals Shielding considerations for ESS LoKI

2020 ◽  
Vol 22 (2-3) ◽  
pp. 119-129
Author(s):  
Gábor Náfrádi ◽  
Anton Orszulik ◽  
Jacob Cooper ◽  
Ben Hicks ◽  
David Turner ◽  
...  
Keyword(s):  
Sans Instrument

LoKI is a SANS instrument being built by STFC ISIS as an in-kind contribution to ESS. According to the recent schedule, LoKI, is one of the first three instruments of ESS that is going to contribute to early science from 2023. MCNP calculations were carried out to determine the required shielding around different sections of the instrument. For the geometry development, SuperMC/MCAM was used. Highlights from the neutronics calculations based on the most frequent classes of possible events are presented here. These include heavy shutter performance, collimator section shielding and detector tank shielding. Activation and background calculations are not detailed in this paper.

Design of 40M SANS instrument at HANARO, Korea

2006 ◽  
Vol 385-386 ◽  
pp. 1177-1179 ◽  
Author(s):  
Young-Soo Han ◽  
Sung-Min Choi ◽  
Tae-Hwan Kim ◽  
Chang-Hee Lee ◽  
Hark-Rho Kim
Keyword(s):  
Sans Instrument

SANS polarization analysis at V4 SANS instrument of HMI Berlin

2008 ◽  
Vol 19 (3) ◽  
pp. 034009 ◽  
Author(s):  
U Keiderling ◽  
A Wiedenmann ◽  
A Rupp ◽  
J Klenke ◽  
W Heil
Keyword(s):  
Polarization Analysis ◽  
Sans Instrument

A concept for the modernization of a SANS instrument at the IBR-2M pulsed reactor

2011 ◽  
Vol 634 (1) ◽  
pp. S161-S164
Author(s):  
R.V. Erhan ◽  
S. Manoshin ◽  
G. Pepy ◽  
A.I. Kuklin ◽  
A.V. Belushkin ◽  
...  
Keyword(s):  
Pulsed Reactor ◽  
Sans Instrument

scholarly journals Design progress of the SANS instrument at CPHS

2012 ◽  
Vol 26 ◽  
pp. 294-298 ◽  
Author(s):  
T.C. Huang ◽  
H. Gong ◽  
B.B. Shao ◽  
D. Wang ◽  
X.Z. Zhang ◽  
...  
Keyword(s):  
Sans Instrument

MCNP simulation to optimise in-pile and shielding parts of the Portuguese SANS instrument

2005 ◽  
Vol 116 (1-4) ◽  
pp. 562-565
Author(s):  
I. F. Gonçalves ◽  
J. Salgado ◽  
A. Falcão ◽  
F. M. A. Margaça ◽  
F. G. Carvalho
Keyword(s):  
Mcnp Simulation ◽  
Sans Instrument

scholarly journals A Unified User-Friendly Instrument Control and Data Acquisition System for the ORNL SANS Instrument Suite

2021 ◽  
Author(s):  
Xingxing Yao ◽  
Blake Avery ◽  
Miljko Bobrek ◽  
Lisa Debeer-Schmitt ◽  
Xiaosong Geng ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
User Needs ◽  
New Instrument ◽  
Depth Analysis ◽  
Instrument Control ◽  
User Friendly ◽  
Sans Instrument ◽  
New System

In an effort to upgrade and provide a unified and improved instrument control and data acquisition system for the ORNL SANS instrument suite (Bio-SANS, EQ-SANS, GP-SANS), beamline scientists and developers teamed up and worked closely together to design and develop a new system. We began with an in-depth analysis of user needs and requirements, covering all perspectives of control and data acquisition based on previous usage data and user feedback. Our design and implementation were guided by the principles from the latest user experience and design research and based on effective practices from our previous projects. In this article, we share details of our design process as well as prominent features of the new instrument control and data acquisition system. The new system provides a sophisticated Q-Range Planner to help scientists and users plan and execute instrument configurations easily and efficiently. The system also provides different user operation interfaces, such as wizard-type tool Panel Scan, a Scripting Tool based on Python Language, and Table Scan, all of which are tailored to different user needs. The new system further captures all the metadata to enable post-experiment data reduction and possibly automatic reduction and provides users with enhanced live displays and additional feedback at the run time. We hope our results will serve as a good example for developing a user-friendly instrument control and data acquisition system at large user facilities.

Study of a multi-pinhole collimation system based small-angle neutron scattering instrument at the Compact Pulsed Hadron Source

2018 ◽  
Vol 51 (6) ◽  
pp. 1605-1615
Author(s):  
Zhiyuan Wang ◽  
Huarui Wu ◽  
Liang Chen ◽  
Liangwei Sun ◽  
Xuewu Wang
Keyword(s):  
Neutron Scattering ◽  
Sample Size ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Signal To Noise Ratio ◽  
Safety Margin ◽  
Beam Intensity ◽  
Opening Angle ◽  
Collimation System ◽  
Sans Instrument

The neutron flux of the Compact Pulsed Hadron Source (CPHS) is about 2–3 orders of magnitude lower than that of large neutron sources, which means that the beam intensity should be improved to achieve good statistics. Multi-pinhole collimation can be used to obtain a lower Q with an acceptable beam intensity in a very small angle neutron scattering (VSANS) instrument and a higher beam intensity for a larger sample size in a small-angle neutron scattering (SANS) instrument. A new nine-pinhole structure is used in a SANS instrument at CPHS to achieve an acceptable range and resolution of Q and a higher beam intensity compared to single-pinhole collimation. The crosstalk issue associated with multi-pinhole collimation is addressed using an optimized algorithm to achieve a higher safety margin and a larger pinhole size with a higher beam intensity at the sample. Different collimator aperture structures are compared on the basis of their noise production. Experiments are performed to verify the theory of calculating reflection noise from the inner surface of the collimator's aperture and parasitic noise from the beveled collimator structure. From a simulated SANS experiment using cold neutrons in the SANS instrument, it is clarified that multi-pinhole collimators with an opening angle on the downstream side have better performance than those with an opening angle on the upstream side and straight-cut collimators. Compared with a single-pinhole collimation system, a nine-pinhole collimation system increases the intensity at the sample by approximately sevenfold when the sample size is increased by 20-fold for CPHS-SANS, and the signal-to-noise ratio is improved by exploiting a specific collimator aperture structure. Our goal is to install a multi-pinhole collimator based SANS instrument at CPHS in the future, and it is hoped that these results will serve to promote the utilization of multi-pinhole collimation systems at other facilities.

Conceptual design of the grazing-incidence focusing small-angle neutron scattering (gif-SANS) instrument at CPHS

2021 ◽  
pp. 1-5
Author(s):  
Huarui Wu ◽  
Weihang Hong ◽  
Yao Zhang ◽  
Pulin Bai ◽  
Wenbo Mo ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Conceptual Design ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
High Performance ◽  
Grazing Incidence ◽  
The Other ◽  
Tsinghua University ◽  
Neutron Sources ◽  
Sans Instrument

Developing small-angle neutron scattering techniques at compact accelerator-driven neutron sources (CANS) is of great importance for expanding the user community and advancing CANS capability. At the Compact Pulsed Hadron Source (CPHS) at Tsinghua University, neutron-focusing mirrors are under intensive research to address the challenge. A grazing-incidence focusing SANS (gif-SANS) project is initialized. It employs a nested supermirror assembly with a large collecting area to achieve ⩾ 10 5 n/s neutron intensity at Q min ⩽ 0.007 Å − 1 . It will equip two detectors, one being a 3He detector for normal Q-range measurements, and the other being a high-resolution detector for extending the Q min down to 10 − 3 Å − 1 . In this work, we present the conceptual design of the gif-SANS at CPHS. Such a scheme is conducive to enable high-performance SANS measurements at CANS.

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