Dissertations / Theses: 'Commissioning experiments'

1

Jansen, Alexander [Verfasser], and G. [Akademischer Betreuer] Drexlin. "The Cryogenic Pumping Section of the KATRIN Experiment - Design Studies and Experiments for the Commissioning / Alexander Jansen. Betreuer: G. Drexlin." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1070584215/34.

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Farkas, I., A. Aszodi, J. Elter, et al. "The European project FLOMIX-R: Description of the experimental and numerical studies of flow distribution in the reactor primary circuit(Final report on WP 3)." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-28628.

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The flow distribution in the primary circuit of the pressurized water reactor was studied with experiments and Computational Fluid Dynamics (CFD) simulations. The main focus was on the flow field and mixing in the downcomer of the pressure vessel: how the different factors like the orientation of operating loops, the total loop flow rate and the asymmetry of the loop flow rates affect the outcome. In addition to the flow field studies the overall applicability of CFD methods for primary circuit thermal-hydraulic analysis was evaluated based on the CFD simulations of the mixing experiments of the ROCOM (Rossendorf Coolant Mixing Model) test facility and the mixing experiments of the Paks NPP. The experimental part of the work in work package 3 included series of steady state mixing experiments with the ROCOM test facility and the publication of results of Paks VVER-440 NPP thermal mixing experiments. The ROCOM test facility models a 4-loop KONVOI type reactor. In the steady-state mixing experiments the velocity field in the downcomer was measured using laser Doppler anemometry and the concentration of the tracer solution fed from one loop was measured at the downcomer and at the core inlet plane. The varied parameters were the number and orientation of the operating loops, the total flow rate and the (asymmetric) flow rate of individual loops. The Paks NPP thermal mixing experiments took place during commissioning tests of replaced steam generator safety valves in 1987-1989. It was assumed that in the reactor vessels of Paks VVER-440 NPP equipped with six loops the mixing of the coolant is not ideal. For the realistic determination of the active core inlet temperature field for the transients and accidents associated with different level temperature asymmetry a set of mixing factors were determined. Based on data from the online core monitoring system and a separate mathematical model the mixing factors for loop flows at the core inlet were determined. In the numerical simulation part of the work package 3 the detailed measurements of ROCOM tests were used for the validation of CFD methods for primary circuit studies. The selected steady state mixing experiments were simulated with CFD codes CFX-4, CFX-5 and FLUENT. The velocity field in the downcomer and the mixing of the scalar were compared between CFD simulations and experiments. The CFD simulations of full scale PWR included the simulation of Paks VVER-440 mixing experiment and the simulation of Loviisa VVER-440 downcomer flow field. In the simulations of Paks experiments the experimental and simulated concentration field at the core inlet were compared and conclusions made concerning the results overall and the VVER-440 specific geometry modelling aspects like how to model the perforated elliptic bottom plate and what is the effect of the cold leg bends to the flow field entering to the downcomer. With Loviisa simulations the qualitative comparison was made against the original commissioning experiments but the emphasis was on the CFD method validation and testing. The overall conclusion concerning the CFD modelling of the flow field and mixing in the PWR primary circuit could be that the current computation capacity and physical models also in commercial codes is beginning to be sufficient for simulations giving reliable and useful results for many real primary circuit applications. However the misuse of CFD methods is easy, and the general as well as the nuclear power specific modelling guidelines should be followed when the CFD simulations are made.

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3

Farkas, I., A. Aszodi, J. Elter, et al. "The European project FLOMIX-R: Description of the experimental and numerical studies of flow distribution in the reactor primary circuit(Final report on WP 3)." Forschungszentrum Rossendorf, 2005. https://hzdr.qucosa.de/id/qucosa%3A21689.

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The flow distribution in the primary circuit of the pressurized water reactor was studied with experiments and Computational Fluid Dynamics (CFD) simulations. The main focus was on the flow field and mixing in the downcomer of the pressure vessel: how the different factors like the orientation of operating loops, the total loop flow rate and the asymmetry of the loop flow rates affect the outcome. In addition to the flow field studies the overall applicability of CFD methods for primary circuit thermal-hydraulic analysis was evaluated based on the CFD simulations of the mixing experiments of the ROCOM (Rossendorf Coolant Mixing Model) test facility and the mixing experiments of the Paks NPP. The experimental part of the work in work package 3 included series of steady state mixing experiments with the ROCOM test facility and the publication of results of Paks VVER-440 NPP thermal mixing experiments. The ROCOM test facility models a 4-loop KONVOI type reactor. In the steady-state mixing experiments the velocity field in the downcomer was measured using laser Doppler anemometry and the concentration of the tracer solution fed from one loop was measured at the downcomer and at the core inlet plane. The varied parameters were the number and orientation of the operating loops, the total flow rate and the (asymmetric) flow rate of individual loops. The Paks NPP thermal mixing experiments took place during commissioning tests of replaced steam generator safety valves in 1987-1989. It was assumed that in the reactor vessels of Paks VVER-440 NPP equipped with six loops the mixing of the coolant is not ideal. For the realistic determination of the active core inlet temperature field for the transients and accidents associated with different level temperature asymmetry a set of mixing factors were determined. Based on data from the online core monitoring system and a separate mathematical model the mixing factors for loop flows at the core inlet were determined. In the numerical simulation part of the work package 3 the detailed measurements of ROCOM tests were used for the validation of CFD methods for primary circuit studies. The selected steady state mixing experiments were simulated with CFD codes CFX-4, CFX-5 and FLUENT. The velocity field in the downcomer and the mixing of the scalar were compared between CFD simulations and experiments. The CFD simulations of full scale PWR included the simulation of Paks VVER-440 mixing experiment and the simulation of Loviisa VVER-440 downcomer flow field. In the simulations of Paks experiments the experimental and simulated concentration field at the core inlet were compared and conclusions made concerning the results overall and the VVER-440 specific geometry modelling aspects like how to model the perforated elliptic bottom plate and what is the effect of the cold leg bends to the flow field entering to the downcomer. With Loviisa simulations the qualitative comparison was made against the original commissioning experiments but the emphasis was on the CFD method validation and testing. The overall conclusion concerning the CFD modelling of the flow field and mixing in the PWR primary circuit could be that the current computation capacity and physical models also in commercial codes is beginning to be sufficient for simulations giving reliable and useful results for many real primary circuit applications. However the misuse of CFD methods is easy, and the general as well as the nuclear power specific modelling guidelines should be followed when the CFD simulations are made.

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4

Ringleb, Stefan [Verfasser], Thomas [Gutachter] Stöhlker, Wilfried [Gutachter] Nörtershäuser, and Richard C. [Gutachter] Thompson. "The HILITE setup for high-intensity-laser experiments with highly charged ions : design and commissioning / Stefan Ringleb ; Gutachter: Thomas Stöhlker, Wilfried Nörtershäuser, Richard C. Thompson." Jena : Friedrich-Schiller-Universität Jena, 2020. http://d-nb.info/1213348722/34.

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Terschlüsen, Joachim A. "Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution : The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy." Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-281298.

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This thesis presents HELIOS, an in-house laboratory for time-resolved pump-probe spectroscopy with extreme-ultraviolet (XUV) probe radiation. A wide span of pump wavelengths can be generated using commercial laser equipment while XUV probe radiation is generated via a high harmonic generation process in a noble gas delivering probe photons with energies between 20 eV and 72 eV. The XUV beam path features a time-preserving monochromator and was constructed and built in-house. HELIOS features an overall time resolution of about 50 fs when using 800 nm pump and 41 eV probe photons. An energy resolution of 110 meV at 41 eV photon energy can be achieved. HELIOS features two beamlines. One µ-focus beamline with an XUV focal size of about 20 µm can be used with experiments that require such a small XUV focal size as well as with different end stations. The other beamline features a semi-permanently mounted end station for angle-resolved photoelectron spectroscopy under ultra-high vacuum conditions. Experiments demonstrating the usability of HELIOS and the two beamlines are presented. A pump-probe measurement on graphene demonstrates the capability of determining a large part of the k-space in only one measurement due to the use of an ARTOF angle-resolved time-of-flight electron spectrometer. A non-angle-resolved pump-probe measurement on the conducting polymer PCPDTBT demonstrates the high signal-to-noise ratio achievable at this beamline in non-angle-resolved photoelectron-spectroscopy pump-probe measurements. The usability of the µ-focus beamline is demonstrated with time-resolved measurements on magnetic samples employing an in-house-designed spectrometer. These experiments allow the retrieval of element-specific information on the magnetization within a sample employing the transversal magneto-optical Kerr effect (T-MOKE). Additionally, a Fourier transform spectrometer for the XUV is presented, the concept was tested at a synchrotron and it was used to determine the longitudinal coherence of the XUV radiation at HELIOS.

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Sarkamo, J. (Juho). "Design, construction and commissioning of the EMMA experiment." Doctoral thesis, University of Oulu, 2014. http://urn.fi/urn:isbn:9789526205694.

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Abstract The work describes the design, construction and commissioning of the underground cosmic-ray experiment Experiment with MultiMuon Array (EMMA). The experiment is built into the Pyhäsalmi mine, in the town of Pyhäjärvi, Finland. The aim of EMMA is to determine the elemental composition of cosmic rays at an energy region around 4 PeV, the energy region called the ’knee’ region. This is achieved by measuring the lateral density distribution of high-energy muons originating from Extensive Air Showers (EAS). The design calculations for the EMMA experiment, which are based on the use of the parametrization of the lateral density distribution of muons, the method of shower reconstruction, and the energy and composition indicators, are presented. A strategy for reconstructing the composition of the cosmic rays is presented and it demonstrates the potential of applying unfolding techniques to the EMMA data. The effect of an array extension on the performance of EMMA is studied. The hardware used in the EMMA experiment is presented starting with an overview of the array and its detector stations. The EMMA array employs three different particle detectors, for which the main technical properties are given, and their use in the EMMA array is presented. A description of the infrastructure of the experiment is given and the rock overburden at the EMMA site at the depth of 80 metres is documented. The work contains the latest analysis of EAS data recorded by the tracking detectors of the experiment, which demonstrates that the experiment is taking data as planned and that the data are according to EAS physics expectations. Methods for event selection and tracking efficiency correction are presented, after which the analysis results of measured track multiplicity spectra are given. The shape of the recorded multiplicity spectrum indicates that the simplest model of a knee-like spectrum with a pure proton composition can not explain the data and that further analysis of the spectrum is required.

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Battilana, Carlo <1980&gt. "Drift Tubes Trigger System of the CMS Experiment at LHC : Commissioning and Performances." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2009. http://amsdottorato.unibo.it/1723/.

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In this thesis the performances of the CMS Drift Tubes Local Trigger System of the CMS detector are studied. CMS is one of the general purpose experiments that will operate at the Large Hadron Collider at CERN. Results from data collected during the Cosmic Run At Four Tesla (CRAFT) commissioning exercise, a globally coordinated run period where the full experiment was involved and configured to detect cosmic rays crossing the CMS cavern, are presented. These include analyses on the precision and accuracy of the trigger reconstruction mechanism and measurement of the trigger efficiency. The description of a method to perform system synchronization is also reported, together with a comparison of the outcomes of trigger electronics and its software emulator code.

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8

Israel, Norman S. "Commissioning of the Trigger module for the 12 GeV era experiment E12-06-114 at JLab." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416241441.

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9

Geis, Christopher Werner [Verfasser]. "The XENON1T water Cherenkov muon veto system and commissioning of the XENON1T Dark Matter experiment / Christopher Werner Geis." Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/116644936X/34.

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10

Turner, W. "The construction and commissioning of the straw tracking detector in the new muon g-2 experiment at Fermilab." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3028553/.

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The anomalous magnetic moments of leptons have been a long standing test of the standard model of particle physics as they can be both measured experimentally and predicted theoretically with high precision. In particular the anomalous magnetic moment of the muon, aμ, has been favoured due to its sensitivity to new physics effects. Currently the world's best measurement of aμ was made at Brookhaven National Laboratory (BNL) in 2001 which resulted in a 3σ deviation between the experimental measurement and theoretical prediction. Since this measurement a number of improvements have been made to the theoretical prediction giving a deviation between theoretical prediction and measured value of over 3.5σ. A new experimental effort has been set up at Fermi National Laboratory (FNAL) in order to measure aμ with a factor of four reduction in the experimental uncertainties. If these aims are met and the central measurement value stays the same a discrepancy will be discovered providing strong evidence for new physics effects. The FNAL experiment uses the same experimental method as BNL which centres around measuring the precession of the μ+ spin after circling an extremely precise magnetic storage ring. To reduce the experimental uncertainties in the new experiment straw tracking detectors have been constructed and installed into the Fermilab muon g-2 storage ring. These detectors measure the stored muon beam profile throughout each fill and enable key independent cross checks of the calorimeter detector systems. This body of work presents the design, construction, testing, installation and commissioning of the straw tracking detectors as well as the ability to match the straw tracker tracks and calorimeter clusters with a focus on measuring the calorimeter pileup rate.

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11

Niemann, Malte [Verfasser]. "Design and commissioning of an experiment for sympathetic cooling and coupling of ions in a cryogenic Penning trap / Malte Niemann." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2019. http://d-nb.info/1194158501/34.

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Vilela, C. "Search for double-beta decay of Ca-48 in NEMO-3 and commissioning of the tracker for the SuperNEMO experiment." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1457059/.

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The double-beta decay of Ca-48 was analysed with data taken by the NEMO-3 experiment with 6.99 grams of isotope and 1918.5 days of live time. The half-life of the two-neutrino double-beta decay of Ca-48 was measured to be 6.4 +0.6-0.7 (stat.) +1.2-0.9 (syst.) x 1019 years, with the corresponding nuclear matrix element measured to be 0.02 +- 0.002. A lower limit of 2.0 x 1022 years was placed on the half-life of the neutrinoless mode, yielding an upper limit on the effective Majorana neutrino mass of 6.1 - 38 eV. Limits were also placed on the R-parity violating supersymmetry trilinear coupling λ'111, on right-handed current couplings λ and η, and on the coupling of the Majoron to the electron neutrino. Work in preparation for the commissioning of the tracking detector for the SuperNEMO double-beta decay experiment is described. The data acquisition and high voltage supply electronics were prepared to read 504 SuperNEMO tracker cells and successfully tested with a smaller 2 x 9 array of tracker cells. A system to supply the SuperNEMO Demonstrator with the tracking gas mixture was designed and built with stringent radon emanation requirements. The system was shown to perform well on tests with a single-cell tracker prototype.

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13

Lucht, Sebastian [Verfasser]. "Installation, commissioning and performance of the trigger system of the Double Chooz experiment and the analysis of hydrogen capture neutrino events / Sebastian Lucht." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1047324512/34.

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Varouchas, D. "Potentiel de découverte par le détecteur ATLAS du boson de Higgs produit par fusion de bosons vecteurs et mise au point de la mesure de l'énergie transverse manquante calorimétrique." Phd thesis, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00452166.

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Le but de cette thèse est d'évaluer le potentiel de découverte par le détecteur ATLAS au Large Hadron Collider (LHC) du boson de Higgs du modèle standard. Le mode de production etudié est déﬁni par la fusion de bosons vecteurs (VBF) suivie de la désintégration en une paire de leptons τ (H → τ ^+ τ ^−). C'est l'un des canaux de découverte les plus prometteurs pour un boson de Higgs de basse masse, qui est favorisé par les mesures de précision dans le secteur électro-faible. Deux modes de désintégration ont été étudiés: celui où les deux leptons τ se d´esintègrent en lepton et celui où un lepton τ se désintègre en lepton et l'autre en hadron. La topologie caractéristique de fusion de bosons vecteurs, qui est constituée des deux jets vers l'avant du détecteur et des produits de désintégration de boson de Higgs dans la région centrale, fournit une signature unique permettant la suppression du bruit de fond. En outre, puisque la fusion des bosons vecteurs est un processus purement électro-faible, aucune activité de QCD n'est prévue et donc aucun jet central n'est attendu pour des événements de signal. Ceci permet l'application de la coupure de “central jet veto” pour encore réduire le bruit de fond. Une analyse basée sur des coupures a été utilisée, se concentrant sur l'optimisation de la coupure de “central jet veto”. L'objectif principal était d'étudier le potentiel de découverte du boson de Higgs avec ATLAS, sous une luminosité intégrée de 30 fb^−1 dans la gamme de masse 115 GeV≤ m_H ≤140 GeV, pour une énergie au centre de la masse √s=14 TeV. Après l'application des coupures, un excès au-dessus de 5σ de signal signiﬁcance a été trouvé pour la gamme de masse 115 GeV ≤ m_H ≤125 GeV. Dans le canal de désintégration H → τ^ + τ ^ −, la résolution de l'énergie transverse manquante ( E_T ) est importante puisqu'elle affecte directement la résolution sur la masse du boson de Higgs. Cela a été la motivation initiale pour réaliser et présenter dans cette thèse une étude de “commissioning” calorimétrique basé sur les quantités E_T , plus particulièrement sur la contribution du bruit de l'électronique, mesurée dans des événements cosmiques enregistrés pendant l'automne 2008. Un comportement gaussien de bruit dans tous les calorimètres de l'argon liquide a été trouvé, tandis qu'un comportement non-gaussien dans une partie du calorimètre à tuile scintillante a été observé. Pour ce dernier, un nouveau modèle de bruit a été examiné utilisant une paramétrisation de double gaussienne ayant pour résultat une description plus réaliste. En conclusion, cette analyse a fourni un outil de “commissioning” du calorimètre, qui a permis l'observation et la correction de plusieurs effets dans le comportement des calorimètres d'ATLAS.

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Bednář, Martin. "Návrh experimentálního robotického pracoviště pro manipulační operace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382047.

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Final thesis is focused on design of experimental workplace with industrial robots for manipulation operations, that will be used for educational and demonstrational purposes. Integration of sub-systems and workplace layout are worked out in this thesis. Key factor is so called virtual commissioning. Unique solution, which is contained within final thesis, combines several software tools for the design of robotic workplace. Static 3D model created in Autodesk Inventor Professional is imported into Tecnomatix Process Simulate, where dynamic 3D model is made – simulation model respectively. The control element is softPLC by Beckhoff company created in TwinCAT software. The connection of simulation model and control element is realized using standardized communication protocol OPC UA. This combination proved to be a cheap tool for virtual commissioning in practice, because only one personal computer is needed for the job.

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Menzel, Jurij Alexander [Verfasser]. "Aufbau und Inbetriebnahme einer Kryoanlage zur Targeterzeugung für Experimente mit Hochenergielasern und Schwerionenstrahlen = Setup and commissioning of a cryogenic system for the production of targets to be used in experiments with high energy lasers and heavy ion beams / von Jurij Alexander Menzel." 2010. http://d-nb.info/1000570827/34.

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Kainz, Kristofer K. "Design, construction, and commissioning of the Exit Charge Detector for BNL-AGS Experiment 896." Thesis, 1998. http://hdl.handle.net/1911/17184.

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The Exit Charge Detector (ECD) is used to determine the impact parameter of relativistic gold-gold interactions in BNL-AGS Experiment 896 by measuring the total charge of projectile-like particles in each collision. Results are presented from simulations which optimized the ECD's dimensions. The ECD was then constructed, and the hardware and the construction techniques used are described. Analyses of data from the operation of the ECD in heavy-ion collisions are discussed. These analyses indicated a significant amount of correlated noise in the experiment. A method to correct for this noise offline is discussed. Also, significant probabilities for the interaction of the beam with materials other than the target are investigated. Finally, plans to improve the detector for the coming Spring 1998 $\rm\sp{197}Au$ run are discussed.

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Stokely, Christopher Lee. "Design, construction, and commissioning of the time-of-flight detector for BNL-AGS Experiment 896." Thesis, 1998. http://hdl.handle.net/1911/17214.

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A Time-of-Flight (TOF) detector is used to provide particle identification in BNL-AGS Experiment 896. It is also used to assist in tracking and as a fast trigger. Results are presented from simulations which optimized the dimensions and position of the TOF system. Rates for measuring daughters of certain strange neutral particles are given for several cuts. Based on these simulation results, TOF detectors were added to the experiment. The analysis of data from a 1997 heavy ion beam run and a 1997 secondary beam run are discussed. The best method to estimate the location of the minimum ionizing peak of the ADC distribution was found among several different methods. Two different methods to slew correct the TDC data are investigated. Effects of momentum variance and path length variance on the time resolution of one of the TOF detector slats are studied. Plans to improve the detector for the upcoming 1998 heavy ion beam run are also discussed.

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Dissertations / Theses on the topic 'Commissioning experiments'

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