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Dissertations / Theses on the topic 'Spallation sources'

Author: Grafiati

Published: 9 March 2023

Last updated: 29 July 2025

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1

CAZZANIGA, CARLO. "Fast neutron measurements for fusion and spallation sources applications." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/54259.

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Questa è una tesi sperimentale riguardante misure di neutroni veloci di interesse per la fusione termonucleare e le sorgenti a spallazione. Alcune tecniche specifiche di spettroscopia ad alti tassi di conteggio ed alta risoluzione sono state studiate e sviluppate per queste applicazioni. In particolare rivelatori al cristallo singolo di diamante (SDD), Telescopi di Protoni di Rinculo (TPR) e scintillatori LaBr3 sono stati studiati con esperimenti presso il tokamak JET (UK), la sorgente a spallazione ISIS (UK) ed altri acceleratori.

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2

FENG, SONG. "Fast neutron-based instruments for application to fusion and spallation sources." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241283.

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As the increasing interest in MeV range neutrons for applied physics studies, the development of dedicated fast neutron-based instruments, which have the capabilities to deal with complex background and to measure high counting rate (MHz), is demanded. This thesis presents the development both on a fast response scintillation detector that has been developed as a neutron emission monitor for deuterium beam diagnostics on large current negative beam test facility (like ELISE or SPIDER), and on the design and test of Telescope Proton Recoil (TPR) neutron spectrometers dedicated for neutron spect

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3

ALBANI, GIORGIA. "High-rate thermal neutron gaseous detector for use at neutron spallation sources." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/158135.

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Il problema, rilevato a livello globale, circa la progressiva riduzione di disponibilità di 3He, ha indotto la comunità scientifica ad intraprendere un’intensa fase di ricerca e sviluppo con lo scopo di trovare tecniche di rivelazione di neutroni alternative a quelle standard basate su 3He. Queste nuove tecnologie, oltre ad avere un’efficienza comparabile a quella dei tubi a 3He, devono risultare idonee ad effettuare misure in sorgenti ad alto flusso di neutroni come la futura European Spallation Source (ESS). In questa tesi di dottorato si ripercorre lo sviluppo di un rivelatore a gas per

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4

Hong, Qian. "Monte Carlo calculation and analysis of neutron and gamma fields at spallation neutron sources for simulating cosmic radiation." Thesis, University of Central Lancashire, 2015. http://clok.uclan.ac.uk/16647/.

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The research of the neutron induced Single Event Effect (SEE) at aircraft altitudes or at ground level are very important since the neutron radiation is able to cause serious errors or damages on electronic components and system. TheWeapons Neutron Research (WNR) facility at Los Alamos Neutron Science Center (LANSCE), and ANITA (Atmospheric-like Neutrons from thIck TArget) facility at The Svedberg Laboratory (TSL) both provide spallation neutron source for radiation testing of electronic components. A local beam monitoring system was successfully developed by S. Platt and L. Zhang in the Unive

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5

REBAI, MARICA. "Fast neutron instrumentation for beam diagnostic." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28449.

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This thesis concerns the development of fast neutron instrumentation for beam diagnostic. Two kind of detectors have been developed. The first is a diamond detector for fast neutron measurements at the ChipIr beamline of the ISIS spallation neutron source (Didcot, UK). ISIS is a 50Hz-pulsed source in which neutrons are produced by 800 MeV protons interacting on a heavy metal target. The second is a Gas Electron Multiplier (GEM) detector developed for measurements of the neutron emission map in the deuterium beam prototype facility for the ITER fusion reactor under construction at the RFX site

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6

Attale, Frédéric. "Systèmes sous-critiques : caractérisation et influence de la source de neutrons sur la neutronique du réacteur." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10077.

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Des protons de quelques centaines de mev et au dela interagissant avec une cible nucleaire epaisse de numero atomique eleve emettent un grand nombre de neutrons rapides (de quelques mev) par spallation. Ces neutrons constituent la source de neutrons d'un systeme hybride de production d'energie. Nous montrons que nous pouvons caracteriser avec une parametrisation assez simple, reliee a la physique, les distributions radiales, longitudinales et energetiques de cette source etendue de neutrons. Cette parametrisation a ete testee pour differentes energies de faisceau avec differents codes de spall

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7

Jonnerby, Jakob. "Accumulator Ring Design for the European Spallation Source Neutrino Super Beam." Thesis, Uppsala universitet, Högenergifysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227509.

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In this thesis, the design of a high intensity accumulator ring for the European Spallation Source Neutrino Super Beam (ESSnuSB) is considered. The European Spallation Source (ESS) linear accelerator (Linac), presently being constructed in Lund, Sweden, presents an interesting opportunity to also host an experiment to detect neutrino CP violation. 0.7 ms long H- pulses would be accelerated to 2 GeV and collide with a target, producing pions which then decay into neutrinos. To focus the pions a toroidal magnet (''neutrino horn'') is pulsed with a 350 kA current. The peak current is about 5 μs l

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8

David, Jean-Christophe. "Spallation : comprendre (p)ou(r) prédire (!) ?" Habilitation à diriger des recherches, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00811587.

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Ce mémoire de HDR traite d'une dizaine d'années de travaux autour de la modélisation des réactions de spallation. Ces réactions sont définies comme l'interaction nucléaire entre une particule légère, le plus souvent un nucléon, et un noyau atomique à une énergie de l'ordre de 100 MeV à 2-3 GeV. Deux étapes les caractérisent. Une phase rapide, la réaction directe appelée aussi cascade intra- nucléaire, et une phase plus lente, la désexcitation du noyau issu de la première phase. À partir de l'association du code développé par le groupe pour la cascade, INCL4, et du code de désexcitation Abla, d

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9

Dashdorj, D. "Spin distribution in preequilibrium reactions for 48Ti + n." Washington, D.C : Oak Ridge, Tenn. : United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2005.

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Thesis (Ph.D.); Submitted to North Carolina State Univ., Raleigh, NC (US); 6 Apr 2005.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "UCRL-TH-211400" Dashdorj, D. 04/06/2005. Report is also available in paper and microfiche from NTIS.

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10

Malkowski, Susan Kate. "MAGNETIC SHIELDING STUDIES FOR THE NEUTRON ELECTRIC DIPOLE MOMENT EXPERIMENT AT THE SPALLATION NEUTRON SOURCE." UKnowledge, 2011. http://uknowledge.uky.edu/physastron_etds/1.

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The neutron Electric Dipole Moment Experiment at the Spallation Neutron Source requires an overall magnetic shielding factor of order 105 to attenuate external background magnetic fields. At present, the shielding design includes an external (room-temperature) multi-layer μ-metal magnetic shield, a cryogenic (4 Kelvin) Pb superconducting shield, and a cryogenic (4 Kelvin) ferromagnetic shield composed of Metglas ribbon. This research determined how to construct a Metglas shield using minimal material that produced axial and transverse shielding factors of ~267 and ~1500. In addition, the μ-met

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11

Kerdraon, Denis. "Optimisation par simulation du couplage entre un réacteur sous-critique et sa source de spallation : application à un démonstrateur." Phd thesis, Grenoble INPG, 2001. http://www.theses.fr/2001INPG0089.

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Les réacteurs hybrides, bases sur le couplage entre un accélérateur de particules et un coeur sous-critique via une cible de spallation, présentent des possibilités de réduction de la radiotoxicité des déchets de haute activité et a vie longue promis au stockage. Les différents concepts proposes ces dernières années dans la communauté scientifique montrent la nécessite de réaliser un démonstrateur. Ce travail de thèse a porte sur l'optimisation par simulation Monte Carlo a l'aide du code MCNPX, de la neutronique d'un tel système dans le but de réaliser un réacteur pilote. Tout d'abord, nous av

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12

Kerdraon, Denis. "Optimisation par simulation du couplage entre un réacteur sous-critique et sa source de spallation : application à un démonstrateur." Phd thesis, Grenoble INPG, 2001. http://tel.archives-ouvertes.fr/tel-00000918.

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Les réacteurs hybrides, bases sur le couplage entre un accélérateur de particules et un coeur sous-critique via une cible<br />de spallation, présentent des possibilités de réduction de la radiotoxicité des déchets de haute activité et a vie<br />longue promis au stockage. Les différents concepts proposes ces dernières années dans la communauté scientifique montrent<br />la nécessite de réaliser un démonstrateur.<br />Ce travail de thèse a porte sur l'optimisation par simulation Monte Carlo a l'aide du code MCNPX, de la neutronique d'un tel<br />système dans le but de réaliser un réacteur pilo

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13

Rossi, Pedro Carlos Russo. "Reações nucleares de alta energia (\" Spallation\") e sua aplicação em cálculo de sistemas nucleares acionados por Fonte." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-16062011-132603/.

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Neste trabalho apresentamos um estudo das reações nucleares de alta energia que são fundamentais na definição do termo fonte dos reatores nucleares subcríticos acionados por fonte externa. Estas reações nucleares, também conhecidas como \"spallation\", consistem na interação de hádrons de alta energia com os núcleons do núcleo atômico. A fenomenologia destas reações consiste em duas etapas, sendo que à primeira, o próton interage através de espalhamentos múltiplos, em um processo denominado cascata intra-nuclear seguido da etapa na qual o núcleo excitado oriundo da cascata intranuclear ou evap

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14

Ferrant, Laure. "Mesures de sections efficaces de fission induite par neutrons sur des actinides du cycle du thorium à n_TOF." Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00011454.

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Dans le contexte des études sur les systèmes innovants de production d'énergie, des réacteurs exploitant le combustible thorium sont envisagés. Les sections efficaces de fission induite par neutrons des actinides qui y sont engagés entrent en jeu dans les simulations de scénarios. Pour les alimenter, des bases de données sont produites à partir de résultats expérimentaux et de modèles. Pour certains noyaux, elles présentent des lacunes ou des désaccords. Pour compléter ces bases de données, nous avons construit un dispositif original constitué d'une alternance de PPACs(chambres à avalanches su

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15

Gideon, Abdullah Mohammed Abdul Fatah, and barrygideon@hotmail com. "Structural Characterisation, Residual Stress Determination and Degree of Sensitisation of Duplex Stainless Steel Welds." RMIT University. Civil, Environmental and Chemical Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091110.101453.

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Welding of duplex stainless steel pipeline material for the oil and gas industry is now common practice. To date, research has been conducted primarily on the parent material and heat affected zones in terms of its susceptibility to various forms of corrosion. However, there has been little research conducted on the degree of sensitisation of the various successive weld layers, namely the root, fill and cap layers. The focus of this research study was to: (i) provide an in-depth microstructural analysis of the various weld passes, (ii) study the mechanical properties of the weld regions; (ii

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16

Dahlfors, Marcus. "Studies of Accelerator-Driven Systems for Transmutation of Nuclear Waste." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Universitetsbiblioteket [distributör], 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6341.

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17

Hosack, Lee Henry. "Investigations on Hydrocyclones for the Spallation Neutron Source." 2007. http://trace.tennessee.edu/utk_gradthes/142.

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The hydrocyclone is commonly used to separate oil from water, and particulates from fluid streams in various process industries. Two-fluid hydrodynamic theory is used here to develop a model for hydrocyclone performance in the application of separation of helium bubbles larger than 30 micron in diameter from liquid mercury at system pressure near 1 bar. The application is related to high power liquid metal target development for proton beams used in spallation neutron sources.

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18

Hosack, Lee Henry. "Investigations on hydrocy[c]lones for the spallation neutron source." 2007. http://etd.utk.edu/2007/HosackLee.pdf.

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19

Schmid, Riccardo. "New Search for the Neutron Electric Dipole Moment Using Ultracold Neutrons at the Spallation Neutron Source." Thesis, 2014. https://thesis.library.caltech.edu/8495/10/thesis.pdf.

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<p>This document introduces the planned new search for the neutron Electric Dipole Moment at the Spallation Neutron Source at the Oak Ridge National Laboratory. A spin precession measurement is to be carried out using Ultracold neutrons diluted in a superfluid Helium bath at T = 0.5 K, where spin polarized 3He atoms act as detector of the neutron spin polarization. This manuscript describes some of the key aspects of the planned experiment with the contributions from Caltech to the development of the project.</p> <p>Techniques used in the design of magnet coils for Nuclear Magnetic Resonanc

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20

Francis, Matthew W. "The Solubility and Diffusivity of Helium in Mercury with Respect to Applications at the Spallation Neutron Source." 2008. http://trace.tennessee.edu/utk_graddiss/387.

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Models for solubility of noble gases in liquid metals are reviewed in detail and evaluated for the combination of mercury and helium for applications at the Spallation Nuetron Source (SNS) at Oak Ridge National Laboratory (ORNL). Gas solubility in mercury is acknowledged to be very low; therefore, mercury has been used in ASTM standard methods as a blocking media for gas solubility studies in organic fluids and water. Models from physical chemistry predict a Henry coefficient for helium in mercury near 3.9x1015 Pa-molHg/molHe, but the models have large uncertainties and are not verified with d

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21

Bartkoski, Dirk A. "The development of computational tools for halo analysis and study of halo growth in the Spallation Neutron Source linear accelerator." 2005. http://etd.utk.edu/2005/BartkoskiDirk.pdf.

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22

Pointer, W. David. "Experimental characterization of flow patterns and flow stability in the bulk mercury flow field of the spallation neutron source mercury target /." 2001. http://etd.utk.edu/2001/Pointer/PointerWDavid.pdf.

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23

Tian, Hongbo. "Effects of environment and frequency on the fatigue behavior of the Spallation Neutron Source (SNS) target container material - 316 LN stainless steel." 2003. http://etd.utk.edu/2003/TianHongbo.pdf.

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Thesis (Ph. D.)--University of Tennessee, Knoxville, 2003.<br>Title from title page screen (viewed Mar. 24, 2004). Thesis advisor: Peter K. Liaw. Document formatted into pages (xxi, 273 p. : ill. (some col.)). Vita. Includes bibliographical references (p. 163-182).

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24

Fleurette, Doresty Fonseca. "UCN Detector development for the TRIUMF Neutron EDM experiment." 2016. http://hdl.handle.net/1993/31186.

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A new measurement of the neutron electric dipole moment (nEDM) is being developed at TRIUMF, where a high density source of ultra cold neutrons (UCN) is currently under construction. A fast, high-efficiency UCN detector is needed for the experiment, and a 6-Li doped glass scintillation detector is being explored for this purpose. In this work, simulations and test measurements were carried out to optimize the light guide design for the new UCN detector. Acrylic and air-core light guides, the latter with two different reflecting surfaces, were considered. Three prototype light guides wer

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