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Hathaway, Graham Michael. "High temperature superconducting power cable termination." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301206.
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Zhang, Zhenyu. "Electrical characterizing of superconducting power cable consisted of second-generation high-temperature superconducting tapes." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707575.
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With the continuous decline in the price of second-generation (2G) high temperature superconducting (HTS) tapes, the 2G HTS cables are a promising candidate to significantly improve the electrical power transmission capacity and efficiency. In order to make the HTS cable competitive to its counterparts in the power market, much ongoing research work have made considerable contributions to the HTS cable design. In this thesis, the challenges of electrical issues of superconducting power cable using 2G HTS tapes have been addressed. The specific contributions of the thesis include: the influence of anisotropic characteristics of 2G HTS is investigated in order to increase critical current of HTS cable; For improvement of transmission efficiency and safety, the homogenization of HTS cable current distribution is achieved considering the influence of contact resistances and HTS layer inductances; AC loss of HTS cable is obtained through experimental measurement for cooling system design; and the impact of HTS cable on power grids is analysed for safe integration of HTS cable into grids. This thesis starts with a literature review of superconductivity and developments of 2G HTS cable. Following the literature review is the critical current investigation of HTS cable considering the anisotropy of 2G HTS tape. 2G HTS tapes were placed in a highly uniform electromagnetic field and the in-field critical currents were measured with various magnitudes and orientations of the magnetic field. The anisotropic characteristics of 2G HTS tape were determined by non-linear curve fitting using measured in-field critical currents and further implemented into the HTS cable finite element method (FEM) modelling. The modelling results indicate that the gap distances among the tapes in the HTS cable affect the critical current of the HTS cable due to the anisotropic characteristics. In order to investigate the critical current of HTS cable with respect to gap distances, an HTS cable circuit model with adjustable gap distances among the parallel placed HTS tapes was designed and built. Extensive experimental and FEM modelling were performed and the results indicate that the minimized gap distance among the neighboring HTS tapes can be beneficial to increase the overall cable critical current. With DC transporting current, the homogenization of current distribution of HTS cable is achieved by controlling the contact resistances. A 1.5 m long prototype HTS cable consisted of two HTS layers was fabricated and tested as a further investigation of the HTS cable circuit model. The magnitude of the contact resistance related to each HTS layer was measured to quantitatively calculate the current distribution. It is found that only a few micro-ohms difference of contract resistances can still cause severe imbalanced current distribution. The FEM modelling work was carried out to obtain the balanced current distribution by varying the contact resistances. With AC transporting current, the inductances of HTS layers in the cable also pose a significant influence on current distribution issues. An optimal algorithm was developed to achieve homogeneous current distribution by optimal design of the cable diameter, pitch angle and winding direction. Another short prototype cable wound with two HTS layers was built according to the optimal design and the current distribution was experimentally measured between the two layers. It is found out that the optimal algorithm is effective to homogenize the AC current distribution. A reliable AC loss measurement was carried out on the 1.5 m long prototype HTS cable in order to quantify the AC loss of the HTS cable for cooling system design. The experimental measurement method is based on the electrical four probe method adopting a compensation coil to cancel the large inductive component of the cable. The HTS cable with long geometry is easily influenced by the surrounding electromagnetic field so that the measured AC loss signal can be influenced. In order to overcome this problem, a symmetrical current return path was utilized in order to eliminate the electromagnetic interface surrounding the HTS cable. The AC loss measurement results are stable and low-noise for a set of AC frequencies, which proves the accuracy of the measurement technique. Finally, a new superconductor component in PSCAD/EMTDC (Power System Computer Aided Design/Electromagnetic Transients including DC) was developed in order to investigate the impact of the HTS cable integrated into the meshed power network. The superconductor component developed in PSCAS/EMTDC takes into account the heat exchange with the HTS cable cryogenic envelope and the detailed configuration of YBCO HTS tape so that HTS cable model is able to accurately predict the power flow, fault current level and grid losses of the power grid with HTS cables.
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Lao, Man I. "Simulation on I-V feature of protection system for superconducting cable." Thesis, University of Macau, 2008. http://umaclib3.umac.mo/record=b1795645.
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Shajii, A. (Ali). "Theory and modelling of quench in cable-in-conduit superconducting magnets." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/11987.
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Okubo, Hitoshi, Masahiro Hanai, Naoki Hayakawa, Fumihiko Kato, and Hiroki Kojima. "Superconducting Fault Current Limiting Cable (SFCLC) with Current Limitation and Recovery Function." Elsevier, 2012. http://hdl.handle.net/2237/20732.
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Renard, Bertrand. "Thermo-Hydraulic behaviour of dual-channel superconducting Cable-In-Conduit Conductors for ITEER." Aix-Marseille 1, 2006. http://www.theses.fr/2006AIX11030.
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Afin d'optimiser le contrôle cryogénique des aimants supraconducteurs pour la fusion (ITER), les conducteurs de type câble en conduit à double canal (CICC) comprennent un canal central qui assure une résistance hydraulique minimale et une circulation d'hélium rapide. Le canal central constitué d'une spirale limite la température des supraconducteurs, mais complique singulièrement le refroidissement du câble. Les pertes de charge de la spirale centrale sont évaluées en azote puis en eau pressurisée ; un modèle de frottement hydraulique est ainsi proposé. Les températures doivent être connues dans le câble, afin de garantir le fonctionnement des supraconducteurs sous charge thermique. Il est alors possible de définir les marges et de fixer la température d'entrée. Des modèles 1D analytiques en régime permanent et transitoire ont été développés afin de mieux comprendre le couplage thermique entre les canaux du CICC. La mesure des constantes caractéristiques d'espace et de temps fournit une évaluation expérimentale de l'homogénéisation thermique interne. Un modèle simple et explicite du coefficient d'échange intercanal est proposé. Le risque de thermosiphon existant entre les deux canaux dans les parties verticales des bobines de fusion est évalué grâce à un critère. Les nouveaux modèles hydrauliques, thermiques et le critère de risque de thermosiphon permettent l'amélioration thermo-hydraulique de la spirale centrale de CICCIn an effort to optimise the cryogenics of large superconducting coils for fusion applications (ITER), dual channel Cable-In-Conduit Conductors (CICC) are designed with a central channel spiral to provide low hydraulic resistance and faster helium circulation. The qualitative and economic rationale of the conductor central channel is here justified to limit the superconductor temperature increase, but brings more complexity to the conductor cooling characteristics. The pressure drop of spirals is experimentally evaluated in nitrogen and water and an explicit hydraulic friction model is proposed. Temperatures in the cable must be quantified to guarantee superconductor margin during coil operation under heat disturbance and set adequate inlet temperature. Analytical one-dimensional thermal models, in steady state and in transient, allow to better understand the thermal coupling of CICC central and annular channels. The measurement of a heat transfer characteristic space and time constants provides cross-checking experimental estimations of the internal thermal homogenisation. A simple explicit model of global interchannel heat exchange coefficient is proposed. The risk of thermosiphon between the two channels is considered since vertical portions of fusion coils are subject to gravity. The new hydraulic model, heat exchange model and gravitational risk ratio allow the thermohydraulic improvement of CICC central spirals
Um die Kryogen-Benutzung und -Kontrolle der Supraleitenden Großmagneten für die Kernfusion (ITER) zu optimieren, wurde der Zweikanalrohrsupraleiterkabel (CICC) mit einer zentralen Spirale entworfen. Der Zentralkanal soll einen minimalen hydraulischen Widerstand und einen schnellen Heliumverkehr gewährleisten, führt jedoch zu einer schwierigeren Abkühlung des Kabels. Das qualitative und ökonomische Grundprinzip der Leiterspirale wird hier durch die Begrenzung der Supraleitertemperatur gerechtfertigt. Der Druckabfall der zentralen Spirale wird experimentell am Stickstoff und danach am Druckwasser ausgewertet und daraus ein hydraulisches Modell vorgeschlagen. Die Temperaturen im Kabel müssen quantitativ bekannt sein, um Hitzestörungen des Supraleiters während des Betriebes der Spule zu verhindern, sowie um ausreichende Spielräume mit entsprechend niedriger Eintrittstemperatur einzustellen. Es wurde analytische eindimensionale Modelle entwickelt, um die thermische Kopplung zwischen den Kanälen des CICC im Dauer- und Übergangszustand besser zu verstehen. Die Messung der Raum- und Zeit-Konstanten liefert eine Versuchsbewertung der internen thermischen Homogenisierung. Es wird ein einfaches und ausdrückliches Modell des globalen Zwischenkanal-Wärmeaustauschkoeffizienten vorgeschlagen. Das bestehende Thermosiphonrisiko zwischen den zwei Kanälen bei vertikale Fusionsspulen verweist auf ein Kriterium. Das neue hydraulische Modell, das Wärmeaustauschmodell und das Kriterium des Thermosiphonrisikos erlauben schließlich die thermohydraulische Optimierung der Kabel-Zentralspirale
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Talami, Matteo. "Modeling of the Toroidal Field Insert coil for the ITER Project." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/12916/.
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Il contenuto della tesi riguarda le analisi numeriche e sperimentali effettuate su un campione di cavo superconduttivo del sistema magnetico del reattore sperimentale per la fusione nucleare “ITER”. In particolare, il campione di cavo denominato “Toroidal Field Insert” o “TFI”, appartiene al sistema magnetico toroidale della macchina e viene inserito in un solenoide esterno in modo da replicare le condizioni di campo magnetico tipiche del normale funzionamento di questo conduttore. Le analisi sperimentali effettuate sul campione sono mirate alla caratterizzazione del comportamento durante un ipotetico ciclo di vita del cavo. I parametri principalmente studiati risultano essere: la caratterizzazione dello stato superconduttivo prima e dopo le varie sollecitazioni imposte, l’efficacia idraulica del raffreddamento e la stabilità termica del magnete. In modo complementare alla analisi dei dati sperimentali, due modelli numerici a diverse scale sono stati sviluppati e testati: un primo modello, alla scala di sistema, si occupa dello studio termico e idraulico dell’intera porzione di cavo testata; il secondo, alla scala di componente, si occupa della simulazione elettromagnetica di un riscaldatore induttivo installato sul conduttore volto a misurarne la stabilità. Il confronto tra l’analisi numerica e quella sperimentale ha permesso la comprensione dei principali fenomeni in gioco e la caratterizzazione del conduttore testato.
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Shimizu, H., T. Shiroki, Y. Yokomizu, and T. Matsumura. "Dependence of quench current level of superconducting wire and cable on the winding tension." IEEE, 1999. http://hdl.handle.net/2237/6792.
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Nelson, Richard J. (Richard Joseph). "Optimization of transverse resistivity for increased stability in ramped cable-in-conduit superconducting magnets." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36010.
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Okubo, Hitoshi, Masahiro Hanai, Naoki Hayakawa, Fumihiko Kato, and Hiroki Kojima. "Feasibility Study on a High-Temperature Superconducting Fault-Current-Limiting Cable (SFCLC) Using Flux-Flow Resistance." IEEE, 2012. http://hdl.handle.net/2237/20734.
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Kovacs, Christopher Joseph. "Influence of Material Properties and Processing on Stability and Protectability in Superconducting Cables and Composites." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1574650528575944.
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Hayakawa, N., M. Nagino, H. Kojima, M. Goto, T. Takahashi, K. Yasuda, and H. Okubo. "Dielectric characteristics of HTS cables based on partial discharge measurement." IEEE, 2005. http://hdl.handle.net/2237/6772.
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Hayakawa, N., T. Kobayashi, M. Hazeyama, T. Takahashi, K. Yasuda, and H. Okubo. "Partial discharge inception characteristics of LN/sub 2//polypropylene laminated paper composite insulation system for high temperature superconducting cables." IEEE, 2005. http://hdl.handle.net/2237/6846.
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Chiesa, Luisa. "Development of an experiment to study the effects of transverse stress on the critical current of a niobium-tin superconducting cable." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41265.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2006.Includes bibliographical references (leaves 197-199).
Superconducting magnets will play a central role for the success of the International Thermonuclear Experimental Reactor (ITER). ITER is a current driven plasma experiment that could set a milestone towards the demonstration of fusion as a source of energy in the future. Cable-in-Conduit is the typical geometry for the conductor employed in superconducting magnets for fusion application. The cable is composed of over 800 strands. Once energized, the magnets produce an enormous electromagnetic force defined by the product of the current and the magnetic field. The strands move under the effect of this force, and the force accumulates against one side of the conduit thereby pressing transversally against the strands. The experiment proposed here has the goal of assessing the functionality of the apparatus designed to study the effect of transverse load on a cable composed of 36 superconducting strands (with a 3x3x4 pattern) by mechanically simulating the ITER Lorentz stress condition. The apparatus was assembled at MIT and preliminary tests at 77 K and room temperature were made to improve the design prior to carrying out the actual experiments. These were done at the National High Magnetic Field Laboratory (NHMFL) located in Florida. Ideally, the transverse conditions simulating the ITER conditions should be created by Lorentz forces due to current and magnetic field. Unfortunately to create such a high level of stress, currents higher than the power supply capability at NHMFL (10 kA) would be required. This is the driving reason to have an apparatus simulating the same stress condition mechanically.
The first test was conducted in October 2005. It was possible to test the structure and its range of operation. Critical current measurements were made as a function of different fields. However during the first measurement, under the loading conditions, the sample was irreversibly damaged and no other measurements were possible. The successful test of the structural behavior of the apparatus motivated a second test carried out in January 2006. With the improvements made between the two experiments, it was possible to successfully measure the degradation of the cable as a function of the transverse pressure applied, measuring degradation as high as 50% with a transverse load of 100 MPa. The ultimate goal of these studies is to characterize the critical current behavior as a function of transverse load in order to predict the response of a full sized Cable-in-Conduit. The work in this thesis was used to explore a setup for measurements and measurement technique. A set of empirical equations describing the behavior of full size cables is needed and should be addressed with a new project that extends the work done so far.
by Luisa Chiesa.
S.M.
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Himbele, John. "Contribution à l'étude d'un insert dipolaire supraconducteur à haute température critique pour accélérateur des particules, utilisent le concept de câble multi-rubans torsadé." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT108/document.
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Les travaux de cette thèse portent sur un insert dipolaire de supraconducteur à haute TC (SHT) en utilisant un câble multi-rubans torsadé pour un accélérateur des particules dans le cadre du projet EuCARD2 au CERN. L’insert dipolaire SHT est la seule possibilité aujourd'hui pour aller au-dessus de 16 T pour le futur accélérateur des particules à haute énergie. Deux spécifications de cet insert SHT sont les grands courants de fonctionnement (> 10 kA) et les champs de fond élevés (> 13 T) conduisant à des conditions de fonctionnement sévères. Pour répondre à ces attentes, un premier insert SHT de multi-rubans torsadé/ type de bloc est proposé sur la base des approches analytiques, numériques et expérimentales. Les travaux sont principalement classés dans le design d’insert dipolaire et le design de câble multi-rubans torsadé. Cette thèse se terminée avec la meilleure solution pour l’insert SHT de multi-rubans torsadé/ type de bloc en utilisant le câble partiellement isoléThis Ph.D. deals with a high Tc superconducting (HTS) dipole insert using a twisted stacked cable for a particle accelerator in the framework of EuCARD2 project in CERN. The HTS dipole insert is the only possibility today to go above 16 T for the future high-energy particle accelerator. Two specifications of these HTS insert are large operating currents (> 10 kA) and high background fields (> 13 T) leading to severe operating conditions. To meet these expectations, a first Twisted Stacked/ Block-type HTS insert is proposed based on analytical, numerical and experimental approaches. The works are mainly classified into dipole insert design and twisted stacked cable design. This Ph.D. ends with the best solution for Twisted Stacked/ Block-type HTS insert using partially-insulated cable
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Coatanea-gouachet, Marc. "Quench detection and behaviour in case of quench in the ITER magnet systems." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4739/document.
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Le quench d'un système magnétique d'ITER est une transition irréversible d'un conducteur, de l'état supraconducteur à l'état normal résistif. Cette zone normale se propage le long du câble au cours du temps, en dissipant une grande quantité d'énergie. La détection se doit d'être suffisamment rapide afin de permettre une décharge de l'énergie magnétique et éviter un endommagement permanent du système. La détection primaire de quench d'ITER est basée sur la détection de la tension due au quench, qui est le moyen le plus rapide. L'environnement magnétique perturbé pendant le scenario plasma rend la détection de cette tension très difficile, à cause des hautes tensions inductives qu'il génère dans les bobinages. En conséquence, des compensations de tension sont nécessaires afin de discriminer la tension résistive due au quench.Une solution conceptuelle de la détection de quench basée sur la mesure des tensions est proposée pour les trois grands systèmes magnétiques d'ITER. Pour ceci, une méthodologie claire est développée, incluant le calcul classique selon le critère du point chaud, l'étude de la propagation de quench grâce au code commercial Gandalf, et l'estimation des perturbations inductives, grâce au développement du code TrapsAV. Des solutions adaptées sont proposée pour ces systèmes ainsi que les paramètres de cette détection, qui sont le seuil de détection (entre 0.1 V et 0.55 V) et le temps de discrimination (entre 1 s et 1.2 s). Les valeurs choisies, et en particulier le temps de discrimination, sont suffisamment élevées pour garantir la fiabilité du système, et pour éviter le déclenchement intempestif de décharges rapides non nécessairesThe quench of one of the ITER magnet system is an irreversible transition from superconducting to normal resistive state, of a conductor. This normal zone propagates along the cable in conduit conductor dissipating a large power. The detection has to be fast enough to dump out the magnetic energy and avoid irreversible damage of the systems. The primary quench detection in ITER is based on voltage detection which is the most rapid detection. The very magnetically disturbed environment during the plasma scenario, makes the voltage detection particularly difficult, inducing large inductive components in the coils and voltage compensations have to be designed to discriminate the resistive voltage associated with the quench. A conceptual design of the quench detection based on voltage measurements is proposed for the three majors magnet systems of ITER. For this, a clear methodology was developed. It includes the classical hot spot criterion, the quench propagation study using the commercial code Gandalf and the careful estimation of the inductive disturbances by developing the TrapsAV code.Specific solutions have been proposed for the compensation in the three ITER magnet systems and for the quench detection parameters which are the voltage threshold (in the range of 0.1 V- 0.55 V) and the holding time (in the range of 1 -1.4 s). The selected values, in particular the holding time, are sufficiently high to ensure the reliability of the system and avoid fast safety discharges not induced by a quench which is a classical problem
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Succi, Giovanni. "Analysis of impregnated Niobium-Tin coils for the High-luminosity LHC magnets." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17800/.
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The High-luminosity project of the LHC calls for the employment of a new technology of superconducting magnets, which will make use of a material never used before, Nb3Sn. Some of the dipole magnets will be replaced inside the accelerator to enhance the collimating system of the beams and will be capable of producing magnetic fields in the order of 12 T, against the 8 T of the present machine.
Experimental tests were conducted at the cryogenic laboratory at CERN to study the thermal behavior of a sample of the 11 T dipole under AC losses, with typical values of the input power density in the order of the mW/cmᵌ. The sample was inserted into an open box of insulator, to get closer to real operation.
This thesis, which was carried out at the MSC (Magnets, Superconductors and Cryostats) Group at CERN, regards the development of a 1-D model of a radial line crossing the middle plane of a quadrant of the magnet. It is also representative of the materials in the section and it was used with the aim to study the temperature evolution and steady-state profiles in response to heat injections in the conductors, similar to those provided in the experiment.
The same model was adapted to reproduce results of quench tests carried out at the SM-18 facility on short models of the 11 T dipole. In such tests, inductive heaters were energized to release heat in the magnet, in order to trigger the quench phenomenon, starting from given operating conditions of current and field. Using magnetic field maps together with the parametrization of the superconducting material, it was possible to derive local values of the T_cs, thus employing the magnet as a temperature probe.
This work presents a detailed description of the model and of the hypothesis made to run the simulations, together with its validation obtained through the comparison with experimental tests cited above.
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Musso, Andrea. "Losses in electrodynamic transient in superconducting Rutherford cables." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/12875/.
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The implementation of a continuum model for the simulation of interstrand coupling currents and the corresponding AC losses in superconducting Rutherford cables, due to electrodynamic transients, is performed. To obtain the necessary level of detail, the electrical model takes into account possible longitudinal variations of the contact conductance. A convergence study is performed to derive the minimum number of mesh elements required. The model is validated comparing loss values per cable twist pitch with the ones obtained through analytical formulae present in literature; an excellent agreement is found. Conclusions are drawn regarding the choice of the boundary conditions and the minimum length of the cable sample, to simulate the behavior of real long cables. In order to suppress losses, a resistive core is inserted in the cable and this strategy is implemented in the model. Induced currents and losses distributions in cables with core are derived and compared with the uncored case; conclusions are drawn about the choice of core width, placement and electrical resistance, to maximize its effect. The model presented is suitable to simulate cables behavior with or without core and subjected to uniform time-varying magnetic fields, considering different geometrical and electrical characteristic.
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Li, Quan. "AC loss characteristics of monolayer and multilayer superconducting power transmission cables." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609500.
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Grilli, Francesco. "Numerical modelling of high temperature superconducting tapes and cables /." [S.l.] : [s.n.], 2004. http://library.epfl.ch/theses/?display=detail&nr=2909.
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Anniballi, Giulio. "Analysis of superconducting Rutherford cables through a lumped parameter circuit." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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The upgrade of the LHC, High Luminosity Large Hadron Collider requires more powerful bending magnets. Four of the 1232 dipoles based on Nb-Ti technology will be replaced with magnets made of Nb3Sn in order to create space for collimators.
This technology will allow the induction magnetic field of the magnets to pass from 8 to 11 Tesla. In this way, shorter magnets are needed for the same integrated field.
Nb3Sn has never been used in magnet technology and its use represents a technological challenge. One of the main characteristic of Nb3Sn is its fragility. This feature could damage one or more of the forty strands of the Rutherford Cable during cool down and assembling phase, creating a breakage. The current flow will be interrupted in correspondence to the breakage and in order to preserve the transport current, it has to flow from the broken strand to others (current distributions).
The aim of this thesis focuses on the analysis of a Rutherford superconducting cable with a breakage through lumped parameter circuits.
In the first phase, a steady state model has been developed to allow us to calculate the values of the adjacent and crossing strands as a function of the spatial coordinate during current plateau.
In order to reduce the complexity of the problem, the developed circuit is made of only three strands. Each of these strands represent a typology in which the forty strands of the cable have been divided : broken, adjacent and crossing strands.
The model has been validated by a comparison with numerical software THEA (Thermal, Hydraulic and Electric Analysis of a generic superconducting cable).
Subsequently of the validation, some parametric studies have been carried out in order to understand which physical parameters of the cable play a key role in the current distribution.
In the second phase, the time dependence of the model has been implemented by adding dynamic components.
The circuit under exam has been solved through state space representation.
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Fleiter, Jérôme. "Development of high Tc superconducting cables for applications in CERN." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00933352.
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En physique des particules, les grands accélérateurs permettent de sonder la matière en produisant des collisions de faisceaux à haute énergie. Dans un accélérateur circulaire, l'énergie maximale de collision dépend directement de l'intensité du champ magnétique dipolaire servant à guider les particules le long de leur orbite. Dans le large collisionneur de hadrons installé au CERN, l'énergie de collision maximale est de 14 TeV dans le centre de masse. Réaliser des collisions à plus haute énergies nécessitera alors l'utilisation de matériaux supraconducteurs à haute température critique (HTS). Dans cette perspective, les propriétés électromécaniques des différents conducteurs HTS sont caractérisées et paramétrées à 4.2 K sous des inductions allant jusqu'à 12 T. Dans les aimants supraconducteurs d'accélérateur, le câble doit être à fort ampérage et à haute densité de courant (15 kA-400 A/mm2). Il consistera en plusieurs conducteurs HTS connectés en parallèle. La caractérisation et la modélisation des performances de tels câbles dans leurs futures conditions opérationnelles sont exposées dans cette thèse.
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Everett, John. "Dissipation in high temperature superconducting tapes." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/8576.
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Rezza, Pasquale. "Mechanical and electrical performances of superconducting cables subject to cyclic stresses." Thesis, Massachusetts Institute of Technology, 1985. https://hdl.handle.net/1721.1/121907.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.Bibliography: leaves 89-91.
by Pasquale Rezza, Jr.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Chen, Yu Ju. "A comprehensive electromagnetic analysis of AC losses in large superconducting cables." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41418.
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Okubo, H., H. Kojima, F. Endo, K. Sahara, R. Yamaguchi, and N. Hayakawa. "Partial Discharge Activity in Electrical Insulation for High Temperature Superconducting (HTS) Cables." IEEE, 2008. http://hdl.handle.net/2237/12061.
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Kato, T., H. Shimizu, Y. J. Tang, N. Hayakawa, Y. Yokomizu, and T. Matsumura. "Quench current level-time characteristics of AC insulated multi-strand superconducting cables." IEEE, 1997. http://hdl.handle.net/2237/6805.
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Ferri, Matthew A. (Matthew Anthony). "Current distribution and stability criteria for superconducting cables in transient magnetic fields." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10406.
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Campbell, Angela Mari. "Architecting aircraft power distribution systems via redundancy allocation." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53087.
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Recently, the environmental impact of aircraft and rising fuel prices have become an increasing concern in the aviation industry. To address these problems, organizations such as NASA have set demanding goals for reducing aircraft emissions, fuel burn, and noise. In an effort to reach the goals, a movement toward more-electric aircraft and electric propulsion has emerged. With this movement, the number of critical electrical loads on an aircraft is increasing causing power system reliability to be a point of concern.
Currently, power system reliability is maintained through the use of back-up power supplies such as batteries and ram-air-turbines (RATs). However, the increasing power requirements for critical loads will quickly outgrow the capacity of the emergency devices. Therefore, reliability needs to be addressed when designing the primary power distribution system.
Power system reliability is a function of component reliability and redundancy. Component reliability is often not determined until detailed component design has occurred; however, the amount of redundancy in the system is often set during the system architecting phase. In order to meet the capacity and reliability requirements of future power distribution systems, a method for redundancy allocation during the system architecting phase is needed.
This thesis presents an aircraft power system design methodology that is based upon the engineering decision process. The methodology provides a redundancy allocation strategy and quantitative trade-off environment to compare architecture and technology combinations based upon system capacity, weight, and reliability criteria.
The methodology is demonstrated by architecting the power distribution system of an aircraft using turboelectric propulsion. The first step in the process is determining the design criteria which includes a 40 MW capacity requirement, a 20 MW capacity requirement for the an engine-out scenario, and a maximum catastrophic failure rate of one failure per billion flight hours. The next step is determining gaps between the performance of current power distribution systems and the requirements of the turboelectric system. A baseline architecture is analyzed by sizing the system using the turboelectric system power requirements and by calculating reliability using a stochastic flow network. To overcome the deficiencies discovered, new technologies and architectures are considered. Global optimization methods are used to find technology and architecture combinations that meet the system objectives and requirements. Lastly, a dynamic modeling environment is constructed to study the performance and stability of the candidate architectures. The combination of the optimization process and dynamic modeling facilitates the selection of a power system architecture that meets the system requirements and objectives.
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Mohammed, Zeshaan Sher. "EFFECT OF MOISTURE ABSORPTION ON THE SINTER QUALITY OF CENTRAL SOLENOID (CS) COIL PACK." 2010. http://trace.tennessee.edu/utk_gradthes/822.
Full textAbstract:
Fusion energy has been said to be the solution to all the world’s energy problems. The International Thermonuclear Experimental Reactor (ITER) is the flagship project to demonstrate the feasibility of fusion energy. The Central Solenoid (CS), an important component of the reactor, is needed to induce plasma current, initiate, ramp-up, ramp-down, and sustain plasma in a very controlled manner. In order to achieve this, the CS coil packs must be manufactured under controlled conditions. The CS conductor is an advanced cable-in-conduit Nb3Sn superconductor. The CS cable will be made in long continuous sections but with thousands of meter of cable needed, splices will have to be made in the field during construction of the ITER reactor. With the ends of the CS cable being exposed to the environment for an unspecified amount of time, concern has been expressed about the effect of the cable exposure on the quality of the splice. As a result an experimental program was devised to replicate and expedite the environmental damage the cable may see while in the field.
The CS cable samples were exposed to 100% humidity at 60, 80, and 100oC for periods ranging from one week to four weeks. Once the samples were soaked for a period of time they were then sintered as would be done in the field. After sintering the mechanical tests were done to determine the load required to push the sintered strands out of the copper sleeve. Initial results obtained with samples having the sleeve thickness of 1.25mm (0.05in) were inconclusive due to the presence of a fold in the copper sleeve formed during the compaction of the sleeve around the cable. To prevent the fold formation, another set of samples were prepared with thicker copper sleeve of 5mm (0.20in).
Results from these samples yielded data that was more conclusive and showed a possible correlation between aging temperature and sintering strength. The experimental data suggests that the thin oxide layer formed during the elevated temperature soak at 100% humidity may even be beneficial to the sinter quality.
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Lu, Bing Luongo Cesar A. "Electrical parameters in multi-strand superconducting cables and their effect on stability." 2006. http://etd.lib.fsu.edu/theses/available/etd-03172006-173643.
Full textAbstract:
Thesis (Ph. D.)--Florida State University, 2006.Advisor: Cesar Luongo, Florida State University, FAMU-FSU College of Engineering, Dept. of Mechanical Engineering. Title and description from dissertation home page (viewed July 28, 2006). Document formatted into pages; contains xiii, 126 pages. Includes bibliographical references.
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Galinhas, Bruno Emanuel Martins. "Study of Helium II heat transport phenomena in superconducting rutherford type cables." Master's thesis, 2015. http://hdl.handle.net/10362/15654.
Full textAbstract:
This thesis is a study of how heat is transported in non-steady-state conditions from a superconducting Rutherford cable to a bath of superfluid helium (He II). The same type of superconducting cable is used in the dipole magnets of the Large Hadron Collider (LHC). The dipole magnets of the LHC are immersed in a bath of He II at 1.9 K. At this temperature helium has an extremely high thermal conductivity. During operation, heat needs to be efficiently extracted from the dipole magnets to keep their superconducting state. The thermal stability of the magnets is crucial for the operation of the LHC, therefore it is necessary to understand how heat is transported from the superconducting cables to the He II bath. In He II the heat transfer can be described by the Landau regime or by the Gorter-Mellink regime, depending on the heat flux. In
this thesis both measurements and numerical simulation have been performed to study the heat transfer in the two regimes. A temperature increase of 8 2 mK of the superconducting cables was successfully measured experimentally. A new numerical
model that covers the two heat transfer regimes has been developed. The numerical model has been validated by comparison with existing experimental data. A comparison is made between the measurements and the numerical results obtained with the developed model.
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Sonnemann, Florian [Verfasser]. "Resistive transition and protection of LHC superconducting cables and magnets / vorgelegt von Florian Sonnemann." 2001. http://d-nb.info/962365955/34.
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Min, Lin Chun, and 林峻敏. "Reduction in Energy Consumption of DC Electric Railways by the Introduction of Superconducting Cables as the Return Conductor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/69144714398701085435.
Full textAbstract:
碩士南台科技大學
電機工程系
98
In recent years, natural disasters are frequent, serious environmental pollution, especially global warming issue is being urgently discussed. Reduce carbon emissions, is already the current world focus on target study. Whether eat vegetarian to save the earth, or the new energy-saving technology, has been pressing for action to save the planet. Railway transportation is the one of the economic development. Although road and air transport, railway transport status is declining. But, large-capacity transport, or in convenience and safety, rail transport can`t be replace. In Taiwan also has completed the railway system around all, It know how the importance of the railway is. Railway electrification is a necessary trend. However used steam, diesel or other power, both have their advantages and disadvantages. Whether low performance of steam engines, or engines burn diesel or fuel that cause air pollution. It is not an advanced country will adopt a mode of transport, using the environment-polluting clean energy, has been a priority. Taiwan is also still doing the whole railway system of electrification. With the wiring length and the density of the railway system, electric energy consumption is very swollen, Effective use energy that is also an important issue. The focus of this study is to use superconductors within a DC rail power system. The advantage of superconductors is zero electrical resistance. Use it to simulate the DC electric railway power simulation in RTSS (Railway Total System Simulator). Simulate superconducting cable iii into the DC electric railway systems to achieve energy saving effect.