scholarly journals Non-destructive Investigation of “The Violinist” a Lead Sculpture by Pablo Gargallo, Using the Neutron Imaging Facility NEUTRA in the Paul Scherrer Institute

2015 ◽  
Vol 69 ◽  
pp. 636-645 ◽  
Author(s):  
Alex Masalles ◽  
Eberhard Lehmann ◽  
David Mannes
Keyword(s):  
Neutron Imaging ◽  
Paul Scherrer Institute ◽  
Paul Scherrer ◽  
Non Destructive

scholarly journals Non-destructive determination and quantification of diffusion processes in wood by means of neutron imaging

Holzforschung ◽  
2009 ◽  
Vol 63 (5) ◽  
Author(s):  
David Mannes ◽  
Walter Sonderegger ◽  
Stefan Hering ◽  
Eberhard Lehmann ◽  
Peter Niemz
Keyword(s):  
Diffusion Processes ◽  
High Sensitivity ◽  
European Beech ◽  
Longitudinal Direction ◽  
Solid Wood ◽  
Neutron Imaging ◽  
Fibre Direction ◽  
Non Invasive ◽  
Paul Scherrer ◽  
Non Destructive

Abstract Diffusion processes in samples of European beech (Fagus sylvatica L.) and Norway spruce (Picea abies [L.] Karst.) were determined and quantified by means of neutron imaging (NI). The experiments were carried out at the neutron imaging facility NEUTRA at the Paul Scherrer Institute in Villigen (Switzerland) using a thermal neutron spectrum. NI is a non-destructive and non-invasive testing method with a very high sensitivity for hydrogen and thus water. Within the scope of this study, diffusion processes in the longitudinal direction were ascertained for solid wood samples exposed to a differentiating climate (dry side/wet side). With NI it was possible to determine the local distribution and consequently the total amount of water absorbed by the samples. The calculated values scarcely differ from those ascertained by weighing (≤3%). The method yields profiles of the water content over the whole sample, thus allowing the local and temporal resolution of diffusion processes within the sample in the main transport direction (longitudinal). On the basis of these profiles, it was possible to calculate the diffusion coefficients along the fibre direction according to Fick's second law.

scholarly journals Emittance measurements of the ACCEL K250 superconducting medical cyclotron at Paul Scherer institute

2006 ◽  
Vol 21 (1) ◽  
pp. 58-60
Author(s):  
Dragan Toprek
Keyword(s):  
Proton Beam ◽  
Beam Profile ◽  
Paul Scherrer Institute ◽  
Superconducting Cyclotron ◽  
Paul Scherrer ◽  
Quadrupole Method

The results of beam profile measurements of the proton beam of the ACCEL K250 superconducting cyclotron at the Paul Scherrer Institute are presented in this paper. Beam emittances in both horizontal and vertical planes are estimated by the varying quadrupole method.

scholarly journals Non-Destructive 3D Neutron Imaging for Power Electronic Module

2021 ◽  
Author(s):  
Daigo Setoyama ◽  
Hidehiko Kimura ◽  
Takenao Shinohara ◽  
Yoshihiro Matsumoto
Keyword(s):  
Neutron Imaging ◽  
Power Electronic ◽  
Non Destructive

scholarly journals Dielectric-Filled Reentrant Cavity Resonator as a Low-Intensity Proton Beam Diagnostic

Instruments ◽  
2018 ◽  
Vol 2 (4) ◽  
pp. 24 ◽  
Author(s):  
Sudharsan Srinivasan ◽  
Pierre-André Duperrex
Keyword(s):  
Resonance Frequency ◽  
Proton Beam ◽  
Second Harmonic ◽  
Cavity Resonator ◽  
Beam Current ◽  
Dielectric Thickness ◽  
Medical Treatment Facility ◽  
Beam Currents ◽  
Paul Scherrer ◽  
Non Destructive

Measurement of the proton beam current (0.1–40 nA) at the medical treatment facility PROSCAN at the Paul Scherrer Institut (PSI) is performed with ionization chambers. To mitigate the scattering issues and to preserve the quality of the beam delivered to the patients, a non-interceptive monitor based on the principle of a reentrant cavity resonator has been built. The resonator with a fundamental resonance frequency of 145.7 MHz was matched to the second harmonic of the pulse repetition rate (72.85 MHz) of the beam extracted from the cyclotron. This was realized with the help of ANSYS HFSS (High Frequency Structural Simulator) for network analysis. Both, the pickup position and dielectric thickness were optimized. The prototype was characterized with a stand-alone test bench. There is good agreement between the simulated and measured parameters. The observed deviation in the resonance frequency is attributed to the frequency dependent dielectric loss tangent. Hence, the dielectric had to be resized to tune the resonator to the design resonance frequency. The measured sensitivity performances were in agreement with the expectations. We conclude that the dielectric reentrant cavity resonator is a promising candidate for measuring low proton beam currents in a non-destructive manner.

Non-Destructive Evaluation of RPV Embrittlement by Means of the Thermoelectric Power Method

2020 ◽  
Author(s):  
M. Niffenegger ◽  
D. F. Mora ◽  
H. Kottmann
Keyword(s):  
Thermoelectric Power ◽  
Power Method ◽  
Dislocation Loops ◽  
The Finite Element Method ◽  
Magnetic Barkhausen Noise ◽  
Charpy Test ◽  
Ultrasonic Scattering ◽  
Paul Scherrer ◽  
Non Destructive ◽  
Surveillance Specimens

Abstract Nondestructive evaluation (NDE) methods are widely used for inspecting safety relevant components in nuclear reactors. Most of these NDE-methods are optimized and applied for the detection of cracks but there is still no reliable NDE method for measuring the embrittlement of RPV steels. However, since the evaluation of RPV embrittlement of so-called Surveillance specimens with the Charpy test is a destructive approach, NDE methods are highly required. Among the investigated technics are acoustic (Ultrasonic scattering), electric (resistivity, thermoelectric) and magnetic (Barkhausen Noise, Non-Linear Harmonics Analysis, Micromagnetic Multiparameter) methods. However, all the methods under investigation suffer from the fact that fracture toughness of steel depends upon several factors, especially on lattice defects such as vacancies, dissolved atoms, dislocation loops, solute clusters, precipitates and dislocations. A major obstacle to the application of NDE methods for the quantification of material embrittlement is that they may be not only sensitive to these defects but also to other factors, such as magnetic, acoustic and electrical properties, as well as to surface quality and ambient temperature, etc.). In this paper, we present results gained by the optimization and application of the thermoelectric power method (TEPM) at the Paul Scherrer Institut (PSI) in Switzerland. The TEPM uses the change of the Seebeck coefficient (K) as an indicator for the material embrittlement. A clear almost linear correlation between the shift of the Nil-Ductile-Transition-Temperature (NDTT) and the change of the K was found. Beside the TEPM and its optimization with the finite element method, we describe the influencing parameters and the potential of this promising NDE method.

scholarly journals The ultracold neutron source at the Paul Scherrer Institute – Performance and status

2019 ◽  
Vol 20 (4) ◽  
pp. 83-86
Author(s):  
A. Anghel ◽  
G. Bison ◽  
B. Blau ◽  
M. Daum ◽  
N. Hild ◽  
...  
Keyword(s):  
Neutron Source ◽  
Ultracold Neutron ◽  
Paul Scherrer Institute ◽  
Paul Scherrer

scholarly journals Non-destructive testing and evaluation of composite materials/structures: A state-of-the-art review

2020 ◽  
Vol 12 (4) ◽  
pp. 168781402091376 ◽  
Author(s):  
Bing Wang ◽  
Shuncong Zhong ◽  
Tung-Lik Lee ◽  
Kevin S Fancey ◽  
Jiawei Mi
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Neutron Imaging ◽  
Image Correlation ◽  
Historical Background ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Testing Technique ◽  
Testing Techniques ◽  
Non Destructive

Composite materials/structures are advancing in product efficiency, cost-effectiveness and the development of superior specific properties. There are increasing demands in their applications to load-carrying structures in aerospace, wind turbines, transportation, medical equipment and so on. Thus, robust and reliable non-destructive testing of composites is essential to reduce safety concerns and maintenance costs. There have been various non-destructive testing methods built upon different principles for quality assurance during the whole lifecycle of a composite product. This article reviews the most established non-destructive testing techniques for detection and evaluation of defects/damage evolution in composites. These include acoustic emission, ultrasonic testing, infrared thermography, terahertz testing, shearography, digital image correlation, as well as X-ray and neutron imaging. For each non-destructive testing technique, we cover a brief historical background, principles, standard practices, equipment and facilities used for composite research. We also compare and discuss their benefits and limitations and further summarise their capabilities and applications to composite structures. Each non-destructive testing technique has its own potential and rarely achieves a full-scale diagnosis of structural integrity. Future development of non-destructive testing techniques for composites will be directed towards intelligent and automated inspection systems with high accuracy and efficient data processing capabilities.

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