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  1. Article: Electrical performance enhancement of MHD microgenerators through the longitudinal shaping of the cross-section.

    Trillaud, F / Guzmán, J E V / Ramírez-Trocherie, M A / Oropeza-Ramos, L

    Heliyon

    2023  Volume 9, Issue 11, Page(s) e22305

    Abstract: In the present work, the impact that the longitudinal shape of channels has on the current produced in the flow of a magneto-hydrodynamic microgenerator (MHDMG) is studied. The goal is to find the micro-channel geometry via modeling to maximize the ... ...

    Abstract In the present work, the impact that the longitudinal shape of channels has on the current produced in the flow of a magneto-hydrodynamic microgenerator (MHDMG) is studied. The goal is to find the micro-channel geometry via modeling to maximize the current output for low Reynolds and Mach regimes. To carry out this study, a 3D dynamic numerical tool relying on the finite volume method was handled with the open-source software OpenFOAM. It is the base model to study the impact of intricate geometries on the ability to produce energy. An additional steady-state 2D analytical model was also developed to check some basic modeling assumptions. Both models have been experimentally validated on the simplest flow system having a constant square cross-section throughout. The results produced by both models cross-check very well and compare favorably with respect to experimental data. Hence, using the validated numerical tool, three shapes have been further investigated, namely, progressive (linear decrease of the cross-section), arc (parabolic decrease of the cross-section), and wavy (sinusoidal shape). It was found that the arc channel provides the greatest current output for the same volumetric flow. It is therefore the preferred choice for developing high current gain and more efficient MHDMG used in micro-scaled actuators and sensors.
    Language English
    Publishing date 2023-11-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e22305
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Essential Material Knowledge and Recent Model Developments for REBCO-Coated Conductors in Electric Power Systems.

    Trillaud, Frederic / Dos Santos, Gabriel / Gonçalves Sotelo, Guilherme

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 8

    Abstract: The manufacturing of commercial REBCO tapes, REBCO referring to Rare-earth barium copper oxide, has matured enough to lead to a variety of applications ranging from scientific instruments to electric power systems. In particular, its large current ... ...

    Abstract The manufacturing of commercial REBCO tapes, REBCO referring to Rare-earth barium copper oxide, has matured enough to lead to a variety of applications ranging from scientific instruments to electric power systems. In particular, its large current density with a high
    Language English
    Publishing date 2021-04-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14081892
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  3. Article ; Online: Magnetic design and modelling of a 14 mm-period prototype superconducting undulator.

    Mishra, G / Gehlot, Mona / Sharma, Geetanjali / Trillaud, Frederic

    Journal of synchrotron radiation

    2017  Volume 24, Issue Pt 2, Page(s) 422–428

    Abstract: The magnetic design of a ten-period (each period 14 mm) prototype superconducting undulator is reported using RADIA. The results of modelling the magnetic flux density are presented in an analytical formula. The dependence of the field integrals and ... ...

    Abstract The magnetic design of a ten-period (each period 14 mm) prototype superconducting undulator is reported using RADIA. The results of modelling the magnetic flux density are presented in an analytical formula. The dependence of the field integrals and phase error on the current density and undulator gap has been calculated, and temperature curves are determined for the models and are compared with earlier reported Moser-Rossmanith fits.
    Language English
    Publishing date 2017--01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2021413-3
    ISSN 1600-5775 ; 0909-0495
    ISSN (online) 1600-5775
    ISSN 0909-0495
    DOI 10.1107/S1600577517001540
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  4. Book ; Online: Electromagnetic modeling of large-scale high-temperature superconductor systems

    Berrospe-Juarez, Edgar / Trillaud, Frederic / Zermeno, Victor M R / Grilli, Francesco

    2020  

    Abstract: The development of the high-temperature superconductors (HTS) conductors has allowed the development of diverse superconductor devices. Some of these devises, like the power generators and high-field magnets, are classified as large-scale HTS systems, ... ...

    Abstract The development of the high-temperature superconductors (HTS) conductors has allowed the development of diverse superconductor devices. Some of these devises, like the power generators and high-field magnets, are classified as large-scale HTS systems, because they are made of hundreds or thousands of turns. Mathematical models are required to address the analysis of these kind of systems. This task cannot be done by means of analytical models, because they are limited to the analysis of simple assemblies. The finite-element models using the H formulation have been extensively used during the last years. Nevertheless, the use of H formulation models to analyze large-scale systems is hindered by the excessive computational load. The recently proposed T-A formulation models have allowed building more efficient models for systems made of HTS tapes. Additionally, the homogenization and multi-scaling methods have been successfully applied in conjunction with the H and T-A formulations, these simplification methods allows reducing the required computational resources. In this article a new simplification method, called densification, is proposed. The strategies emerging from the combined use of the formulations and the simplification methods already mentioned are extensively explored, and the comprehensive validation and comparison of all the resulting strategies is presented.
    Keywords Physics - Applied Physics
    Subject code 621
    Publishing date 2020-06-03
    Publishing country us
    Document type Book ; Online
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  5. Book ; Online: Real-time simulation of large-scale HTS systems

    Berrospe-Juarez, Edgar / Zermeno, Victor M R / Trillaud, Frederic / Grilli, Francesco

    multi-scale and homogeneous models using T-A formulation

    2018  

    Abstract: The emergence of second-generation high temperature superconducting tapes has favored the development of large-scale superconductor systems. The mathematical models capable of estimating electromagnetic quantities in superconductors have evolved from ... ...

    Abstract The emergence of second-generation high temperature superconducting tapes has favored the development of large-scale superconductor systems. The mathematical models capable of estimating electromagnetic quantities in superconductors have evolved from simple analytical models to complex numerical models. The available analytical models are limited to the analysis of single wires or infinite arrays that, in general, do not represent real devices in real applications. The numerical models based on finite element method using the H formulation of the Maxwells equations are useful for the analysis of medium-size systems, but their application in large-scale systems is problematic due to the excessive computational cost in terms of memory and computation time. Then it is necessary to devise new strategies to make the computation more efficient. The homogenization and the multi-scale methods have successfully simplified the description of the systems allowing the study of large-scale systems. Also, efficient calculations have been achieved using the T-A formulation. In the present work, we propose a series of adaptations to the multi-scale and homogenization methods so that they can be efficiently used in conjunction with the T-A formulation to compute the distribution of current density and hysteresis losses in the superconducting layer of superconducting tapes. The computation time and the amount of memory are substantially reduced up to a point that it is possible to achieve real-time simulations of HTS large-scale systems under slow ramping cycles of practical importance on personal computers.
    Keywords Physics - Applied Physics
    Subject code 621
    Publishing date 2018-11-22
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: First Direct-Detection Constraints on eV-Scale Hidden-Photon Dark Matter with DAMIC at SNOLAB.

    Aguilar-Arevalo, A / Amidei, D / Bertou, X / Butner, M / Cancelo, G / Castañeda Vázquez, A / Cervantes Vergara, B A / Chavarria, A E / Chavez, C R / de Mello Neto, J R T / D'Olivo, J C / Estrada, J / Fernandez Moroni, G / Gaïor, R / Guardincerri, Y / Hernández Torres, K P / Izraelevitch, F / Kavner, A / Kilminster, B /
    Lawson, I / Letessier-Selvon, A / Liao, J / Matalon, A / Mello, V B B / Molina, J / Privitera, P / Ramanathan, K / Sarkis, Y / Schwarz, T / Settimo, M / Sofo Haro, M / Thomas, R / Tiffenberg, J / Tiouchichine, E / Torres Machado, D / Trillaud, F / You, X / Zhou, J

    Physical review letters

    2017  Volume 118, Issue 14, Page(s) 141803

    Abstract: We present direct detection constraints on the absorption of hidden-photon dark matter with particle masses in the range 1.2-30  eV c^{-2} with the DAMIC experiment at SNOLAB. Under the assumption that the local dark matter is entirely constituted of ... ...

    Abstract We present direct detection constraints on the absorption of hidden-photon dark matter with particle masses in the range 1.2-30  eV c^{-2} with the DAMIC experiment at SNOLAB. Under the assumption that the local dark matter is entirely constituted of hidden photons, the sensitivity to the kinetic mixing parameter κ is competitive with constraints from solar emission, reaching a minimum value of 2.2×10^{-14} at 17  eV c^{-2}. These results are the most stringent direct detection constraints on hidden-photon dark matter in the galactic halo with masses 3-12  eV c^{-2} and the first demonstration of direct experimental sensitivity to ionization signals <12  eV from dark matter interactions.
    Language English
    Publishing date 2017-04-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.118.141803
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    In stock of ZB MED Bonn / Germany

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  7. Book ; Online: DAMIC at SNOLAB

    Chavarria, Alvaro / Tiffenberg, Javier / Aguilar-Arevalo, Alexis / Amidei, Dan / Bertou, Xavier / Cancelo, Gustavo / D'Olivo, Juan Carlos / Estrada, Juan / Moroni, Guillermo Fernandez / Izraelevitch, Federico / Kilminster, Ben / Langisetty, Yashmanth / Liao, Junhui / Molina, Jorge / Privitera, Paolo / Salazar, Carolina / Sarkis, Youssef / Scarpine, Vic / Schwarz, Tom /
    Haro, Miguel Sofo / Trillaud, Frederic / Zhou, Jing

    2014  

    Abstract: We introduce the fully-depleted charge-coupled device (CCD) as a particle detector. We demonstrate its low energy threshold operation, capable of detecting ionizing energy depositions in a single pixel down to 50 eVee. We present results of energy ... ...

    Abstract We introduce the fully-depleted charge-coupled device (CCD) as a particle detector. We demonstrate its low energy threshold operation, capable of detecting ionizing energy depositions in a single pixel down to 50 eVee. We present results of energy calibrations from 0.3 keVee to 60 keVee, showing that the CCD is a fully active detector with uniform energy response throughout the silicon target, good resolution (Fano ~0.16), and remarkable linear response to electron energy depositions. We show the capability of the CCD to localize the depth of particle interactions within the silicon target. We discuss the mode of operation and unique imaging capabilities of the CCD, and how they may be exploited to characterize and suppress backgrounds. We present the first results from the deployment of 250 um thick CCDs in SNOLAB, a prototype for the upcoming DAMIC100. DAMIC100 will have a target mass of 0.1 kg and should be able to directly test the CDMS-Si signal within a year of operation.

    Comment: 13 pages, 12 figures, proceedings prepared for 13th International Conference on Topics in Astroparticle and Underground Physics (TAUP2013)
    Keywords Physics - Instrumentation and Detectors ; Astrophysics - Instrumentation and Methods for Astrophysics ; High Energy Physics - Experiment
    Subject code 621
    Publishing date 2014-06-30
    Publishing country us
    Document type Book ; Online
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