scholarly journals A novel method to improve the spatial resolution of GEM neutron detectors with a stopping layer

2021 ◽  
Author(s):  
Tao Yang ◽  
Jianrong Zhou ◽  
Xiaojuan Zhou ◽  
Lin Zhu ◽  
Hangyu Zhu ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Ambient Pressure ◽  
Beam Line ◽  
Spallation Neutron Source ◽  
Monte Carlo Program ◽  
Neutron Detectors ◽  
Novel Method ◽  
Neutron Converter ◽  
Gem Detectors ◽  
Secondary Ion

This paper proposes a novel method to improve the spatial resolution of ceramic GEM detectors by adding a stopping layer on top of the solid <sup>10</sup>B4C neutron converter. This will restrict the emission of the secondary ion products of large angles and consequently improve the spatial resolution. The Monte Carlo program FLUKA is used to validate the method, and the verification experiments are carried out at the beam line #20 (BL20) of the China Spallation Neutron Source (CSNS). The experimental results are approximately in agreement with the simulations. The measured spatial resolution is 1.61 mm for the GEM neutron detector operated at ambient pressure with a 1-μm-thick <sup>10</sup>B4C converter, and it is improved to ~0.8 mm by coating a 3-μm-thick titanium on top of the <sup>10</sup>B4C converter.<br><br>

scholarly journals A novel method to improve the spatial resolution of GEM neutron detectors with a stopping layer

2021 ◽  
Author(s):  
Tao Yang ◽  
Jianrong Zhou ◽  
Xiaojuan Zhou ◽  
Lin Zhu ◽  
Hangyu Zhu ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Ambient Pressure ◽  
Beam Line ◽  
Spallation Neutron Source ◽  
Monte Carlo Program ◽  
Neutron Detectors ◽  
Novel Method ◽  
Neutron Converter ◽  
Gem Detectors ◽  
Secondary Ion

This paper proposes a novel method to improve the spatial resolution of ceramic GEM detectors by adding a stopping layer on top of the solid <sup>10</sup>B4C neutron converter. This will restrict the emission of the secondary ion products of large angles and consequently improve the spatial resolution. The Monte Carlo program FLUKA is used to validate the method, and the verification experiments are carried out at the beam line #20 (BL20) of the China Spallation Neutron Source (CSNS). The experimental results are approximately in agreement with the simulations. The measured spatial resolution is 1.61 mm for the GEM neutron detector operated at ambient pressure with a 1-μm-thick <sup>10</sup>B4C converter, and it is improved to ~0.8 mm by coating a 3-μm-thick titanium on top of the <sup>10</sup>B4C converter.<br><br>

A Novel Method to Improve the Spatial Resolution of GEM Neutron Detectors With a Stopping Layer

2021 ◽  
pp. 1-1
Author(s):  
Tao Yang ◽  
Jianrong Zhou ◽  
Xiaojuan Zhou ◽  
Lin Zhu ◽  
Hangyu Zhu ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Neutron Detectors ◽  
Novel Method

scholarly journals Study of the spatial resolution of low-material GEM tracking detectors

2018 ◽  
Vol 174 ◽  
pp. 06005 ◽  
Author(s):  
V.N. Kudryavtsev ◽  
T.V. Maltsev ◽  
L.I. Shekhtman
Keyword(s):  
Spatial Resolution ◽  
High Energy ◽  
Relaxation Processes ◽  
Post Processing ◽  
Auger Electrons ◽  
High Energy Electrons ◽  
Atomic Relaxation ◽  
Gem Detectors ◽  
Kapton Foil ◽  
Exact Amount

The spatial resolution of GEM based tracking detectors has been simulated and measured. The simulation includes the GEANT4 based transport of high energy electrons with careful accounting for atomic relaxation processes including emission of fluorescent photons and Auger electrons and custom post-processing, including accounting for diffusion, gas amplification fluctuations, the distribution of signals on readout electrodes, electronics noise and a particular algorithm of the final coordinate calculation (center of gravity). The simulation demonstrates that a minimum of the spatial resolution of about 10 μm can be achieved with strip pitches from 250 μm to 300 μm. For larger pitches the resolution is quickly degrading reaching 80-100 μm at a pitch of 500 μm. The spatial resolution of low-material triple-GEM detectors for the DEUTRON facility at the VEPP-3 storage ring is measured at the extracted beam facility of the VEPP-4M collider. The amount of material in these detectors is reduced by etching the copper of the GEMs electrodes and using a readout structure on a thin kapton foil rather than on a glass fibre plate. The exact amount of material in one DEUTRON detector is measured by studying multiple scattering of 100 MeV electrons in it. The result of these measurements is X/X0 = 2.4×10−3 corresponding to a thickness of the copper layers of the GEM foils of 3 μm. The spatial resolution of one DEUTRON detector is measured with 500 MeV electrons and the measured value is equal to 35 ± 1 μm for orthogonal tracks.

scholarly journals Triple Oxygen Isotope Measurements by Multi-Collector Secondary Ion Mass Spectrometry

2021 ◽  
Vol 8 ◽  
Author(s):  
Nordine Bouden ◽  
Johan Villeneuve ◽  
Yves Marrocchi ◽  
Etienne Deloule ◽  
Evelyn Füri ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Oxygen Isotope ◽  
Spatial Resolution ◽  
Secondary Ion Mass Spectrometry ◽  
Small Radius ◽  
Large Radius ◽  
Ion Mass Spectrometry ◽  
Secondary Ion ◽  
Isotope Measurements

Secondary ion mass spectrometry (SIMS) is a powerful technique for in situ triple oxygen isotope measurements that has been used for more than 30 years. Since pioneering works performed on small-radius ion microprobes in the mid-80s, tremendous progress has been made in terms of analytical precision, spatial resolution and analysis duration. In this respect, the emergence in the mid-90s of the large-radius ion microprobe equipped with a multi-collector system (MC-SIMS) was a game changer. Further developments achieved on CAMECA MC-SIMS since then (e.g., stability of the electronics, enhanced transmission of secondary ions, automatic centering of the secondary ion beam, enhanced control of the magnetic field, 1012Ω resistor for the Faraday cup amplifiers) allow nowadays to routinely measure oxygen isotopic ratios (18O/16O and 17O/16O) in various matrices with a precision (internal error and reproducibility) better than 0.5‰ (2σ), a spatial resolution smaller than 10 µm and in a few minutes per analysis. This paper focuses on the application of the MC-SIMS technique to the in situ monitoring of mass-independent triple oxygen isotope variations.

SuperMeshing: A Deep Learning Method for Boosting Mesh Density in Numerical Computation Within 2D Domain

2021 ◽  
Author(s):  
Handing Xu ◽  
Zhenguo Nie ◽  
Qingfeng Xu ◽  
Xinjun Liu
Keyword(s):  
Numerical Computation ◽  
Spatial Resolution ◽  
Maximum Stress ◽  
Linear Mapping ◽  
Stress Fields ◽  
Von Mises Stress ◽  
Full Detail ◽  
Mesh Density ◽  
Novel Method ◽  
Von Mises

Abstract Due to the limit of mesh density, the improvement of the spatial resolution of numerical computation always leads to a decrease in computing efficiency. Aiming at this inability of numerical computation, we propose a novel method for boosting the mesh density in finite element method (FEM) within 2D domain. Based on the von Mises stress fields of 2D plane-strain problems computed by the FEM, this method utilizes a deep neural network named SuperMeshingNet to learn a non-linear mapping from low mesh-density to high mesh-density in stress fields, and realizes the improvement of numerical computation accuracy and efficiency simultaneously. We adopt residual dense blocks into our mesh-density boost model – SuperMeshingNet to extract abundant local features and enhance the prediction capacity. The results indicate that SuperMeshingNet is able to effectively increase the spatial resolution of the von Mises stress fields under the multiple scaling factors: 2X,4X,and8X. Compared with the targets, the relative error of SuperMeshingNet is 2.44%, which shows better performance than the interpolation methods. Besides, SuperMeshingNet reveals an astonishing strength in predicting the maximum stress value. We publicly share our work with full detail of implementation at https://github.com/zhenguonie/2021_SuperMeshing_2D_Plane_Strain.

Development of a Submilli-PIXE Camera

1998 ◽  
Vol 08 (02n03) ◽  
pp. 209-216 ◽  
Author(s):  
S. MATSUYAMA ◽  
K. GOTOH ◽  
K. ISHII ◽  
H. YAMAZAKI ◽  
T. SATOH ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Spatial Resolution ◽  
Data Acquisition System ◽  
Beam Line ◽  
Beam Position ◽  
Pixe Analysis ◽  
X Ray ◽  
System A ◽  
Line Beam ◽  
Analysis System

We developed a PIXE analysis system which provides spatial distribution images of elements in a region of several cm2 with a spatial resolution of < 0.5 mm. We call this system a submilli-PIXE camera. This system consists of a submilli-beam line, beam scanners and a data acquisition system in which the X-ray energy and the beam position are simultaneously measured. We demonstrate the usefulness of the submilli-PIXE camera by analyzing the surface of a shell and of granite.

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.

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