Measurement and analysis of induced activities in concrete irradiated using high-energy neutrons at KENS neutron spallation source facility

2005 ◽  
Vol 115 (1-4) ◽  
pp. 623-629 ◽  
Author(s):  
Koji Oishi ◽  
Noriaki Nakao ◽  
Kazuaki Kosako ◽  
Hiroshi Yamakawa ◽  
Hiroshi Nakashima ◽  
...  
Keyword(s):  
High Energy ◽  
Neutron Spallation Source ◽  
Measurement And Analysis ◽  
Spallation Source

scholarly journals The Meson Production Targets in the high energy beamline of HIPA at PSI

2021 ◽  
Author(s):  
Daniela Kiselev ◽  
Pierre-André Duperrex ◽  
Sven Jollet ◽  
Stefan Joray ◽  
Daniel Laube ◽  
...  
Keyword(s):  
Meson Production ◽  
High Energy ◽  
Thick Target ◽  
Proton Accelerator ◽  
Beam Power ◽  
Graphite Target ◽  
Beam Dump ◽  
Neutron Spallation Source ◽  
Spallation Source ◽  
Paul Scherrer

Two target stations in the 590 MeV proton beamline of the High Intensity Proton Accelerator (HIPA) at the Paul Scherrer Institut (PSI) produce pions and muons for seven secondary beamlines, leading to several experimental stations. The two target stations are 18 m apart. Target M is a graphite target with an effective thickness of 5 mm, Target E is a graphite wheel with a thickness of 40 mm or 60 mm. Due to the spreading of the beam in the thick target, a high power collimator system is needed to shape the beam for further transport. The beam is then transported to either the SINQ target, a neutron spallation source, or stopped in the beam dump, where about 450 kW beam power is dissipated. Targets, collimators and beam dumps are described.

Mechanical Spectroscopy Investigation of Liquid Pb-Bi Alloys

2012 ◽  
Vol 184 ◽  
pp. 434-439 ◽  
Author(s):  
Roberto Montanari ◽  
Alessandra Varone
Keyword(s):  
Distribution Functions ◽  
X Ray Diffraction ◽  
Mechanical Spectroscopy ◽  
X Ray ◽  
Neutron Spallation Source ◽  
Driven System ◽  
Spallation Source ◽  
Accelerator Driven System ◽  
The Mean ◽  
Diffraction Patterns

Liquid Pb–Bi eutectic alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system. The alloy has been characterized in liquid state from melting (125 °C) to 650 °C by mechanical spectroscopy. Experiments have been carried out using hollow reeds of austenitic stainless steel filled with the Pb-Bi alloy and sealed at the extremities. From 350 °C to 520 °C modulus shows a remarkable drop accompanied by a broad internal friction maximum. In the same temperature range radial distribution functions, determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The anelastic phenomena have been attributed to a structural re-arrangement of liquid metal. For comparison, other alloys of the Pb-Bi system with hypo-eutectic composition have been investigated.

scholarly journals 4D Bragg Edge Tomography of Directional Ice Templated Graphite Electrodes

2020 ◽  
Vol 6 (12) ◽  
pp. 136
Author(s):  
Ralf F. Ziesche ◽  
Anton S. Tremsin ◽  
Chun Huang ◽  
Chun Tan ◽  
Patrick S. Grant ◽  
...  
Keyword(s):  
Li Ion Battery ◽  
Graphite Electrodes ◽  
Neutron Spallation Source ◽  
Spallation Source ◽  
Li Ion ◽  
Tomography Method ◽  
First Time ◽  
Pulsed Neutron ◽  
Tomography Data ◽  
Insight Into

Bragg edge tomography was carried out on novel, ultra-thick, directional ice templated graphite electrodes for Li-ion battery cells to visualise the distribution of graphite and stable lithiation phases, namely LiC12 and LiC6. The four-dimensional Bragg edge, wavelength-resolved neutron tomography technique allowed the investigation of the crystallographic lithiation states and comparison with the electrode state of charge. The tomographic imaging technique provided insight into the crystallographic changes during de-/lithiation over the electrode thickness by mapping the attenuation curves and Bragg edge parameters with a spatial resolution of approximately 300 µm. This feasibility study was performed on the IMAT beamline at the ISIS pulsed neutron spallation source, UK, and was the first time the 4D Bragg edge tomography method was applied to Li-ion battery electrodes. The utility of the technique was further enhanced by correlation with corresponding X-ray tomography data obtained at the Diamond Light Source, UK.

Assessment of shutdown dose rates at the ESS target cooling system using SCALE6.2

2020 ◽  
Vol 22 (2-3) ◽  
pp. 309-318
Author(s):  
Amalia Chambon ◽  
Esben Klinkby ◽  
Leif Emås ◽  
Bent Lauritzen
Keyword(s):  
Dose Rate ◽  
Source Term ◽  
Cooling System ◽  
High Energy ◽  
Beam Power ◽  
Robot Arm ◽  
Robotic Arms ◽  
Dose Rates ◽  
Spallation Source ◽  
Conservative Estimation

The production of high-energy neutrons at the European Spallation Source through the spallation process may cause an erosion of the tungsten target. The eroded particles could be released into the target helium cooling system which contains four kind of filters. Among them, the auxiliary filters called “getters” are designed to capture volatile elements and remaining dust. In this work, the ORNL’s SCALE6.2 modelling and simulation suite for nuclear safety analysis is applied to assess shutdown dose rates and determine if added shielding and/or robotic arms are needed for their maintenance. SCALE6.2 is well adapted to treat this problem as it allows for isotope selection regarding source term calculation. Dose rates are determined by an ORIGEN2 source term and a MAVRIC shielding sequence calculation. As SCALE6.2 is non-standard software for ESS, the results are verified against MCNP, which is the baseline tool for neutronics analysis at ESS. Dose rate calculations show that additional shielding and/or robot arm are not needed to remove the getters after 3 months of cooling time, following 5400 h of operation at 5 MW beam power. At a distance of 1 mm from the getter, the dose rate is 0.2 mSv/h in the most conservative estimation.

scholarly journals Austria wants to build a neutron spallation source. The Austron Proposal

1999 ◽  
Vol 30 (4) ◽  
pp. 100-100
Author(s):  
Philip Bryant ◽  
Albert Furrer ◽  
Erich Griesmayer ◽  
Erwin Jericha ◽  
Helmut Rauch ◽  
...  
Keyword(s):  
Neutron Spallation Source ◽  
Spallation Source

The measurement and analysis of high energy gamma-ray spectra

1966 ◽  
Vol 44 (2) ◽  
pp. 229-238 ◽  
Author(s):  
R.R. Whitehead ◽  
G.G. Shute ◽  
A.W. Parker
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
High Energy Gamma ◽  
Measurement And Analysis ◽  
Energy Gamma

Structural Changes of Liquid Pb-Bi Eutectic Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 878-883 ◽  
Author(s):  
Paolo Deodati ◽  
Franco Gauzzi ◽  
Roberto Montanari ◽  
Alessandra Varone
Keyword(s):  
Dynamic Modulus ◽  
Structural Changes ◽  
Distribution Functions ◽  
X Ray Diffraction ◽  
Mechanical Spectroscopy ◽  
Neutron Spallation Source ◽  
Driven System ◽  
Spallation Source ◽  
Accelerator Driven System ◽  
Diffraction Patterns

Liquid Pb–Bi eutectic (LBE) alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system (ADS). The alloy has been characterized in liquid state from melting (125 °C) to 750 °C by mechanical spectroscopy, i.e. internal friction (IF) and dynamic modulus measurements. The experiments have been carried out using hollow reeds of austenitic stainless steel filled with Pb-Bi alloy and sealed at the extremities. Dynamic modulus showed a remarkable drop in the range 350-520 °C. In the same temperature range radial distribution functions (RDFs), determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The phenomenon has been explained as a structural re-arrangement of atoms in the liquid metal.

Elemental Clustering and Structure of Liquid LBE

2014 ◽  
Vol 922 ◽  
pp. 785-790
Author(s):  
Santosh Balijepalli ◽  
Saulius Kaciulis ◽  
Matteo Amati ◽  
Roberto Montanari ◽  
Alessandra Varone
Keyword(s):  
Cluster Size ◽  
X Ray Diffraction ◽  
Progressive Change ◽  
Driven Systems ◽  
X Ray ◽  
Nearest Neighbours ◽  
Neutron Spallation Source ◽  
Different Temperatures ◽  
Spallation Source ◽  
Accelerator Driven Systems

Liquid Pb–Bi eutectic (LBE) alloy is of great interest as coolant and neutron spallation source for the accelerator driven systems (ADS). Scanning Photoemission Microscopy (SPEM) at the ELETTRA synchrotron radiation facility of Trieste was carried out on samples quenched from melt at different temperatures. SPEM analyses show that the two components (Pb and Bi) are not homogeneously distributed in the range of temperature from melting up to 518 °C, in particular they form clusters enriched in Pb and Bi. The cluster size decreases as temperature increases hence diffusion occurs between clusters and matrix leading to the progressive disgregation of clusters that is almost completed at 518 °C. Such micro-chemical evolution is accompanied by a structural change of the liquid evidenced by the results of High-temperature X-ray Diffraction (HT-XRD). In particular, radial distribution function (RDF) curves show a progressive change of the ratio between the shell radii of 1st and 2nd nearest neighbours.

Sign in / Sign up

Export Citation Format

Share Document