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CERN Document Server 27 records found  1 - 10próximoend  jump to record: Search took 1.17 seconds. 
1.
Beam-Based Reconstruction of the Shielded Quench-Heater Fields for the LHC Main Dipoles / Richtmann, Lea (CERN) ; Bortot, Lorenzo (CERN) ; Ravaioli, Emmanuele (CERN) ; Wiesner, Christoph (CERN) ; Wollmann, Daniel (CERN)
Small orbit oscillations of the circulating particle beams have been observed immediately following quenches in the LHC’s superconducting main dipole magnets. Magnetic fields generated during the discharge into the quench heaters were identified as the cause. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1874-1877 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1874-1877
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2.
On the Stability of Mixed Finite-Element Formulations for High-Temperature Superconductors / Dular, Julien (Liege U.) ; Harutyunyan, Mane (Darmstadt, Tech. U.) ; Bortot, Lorenzo (Darmstadt, Tech. U. ; CERN) ; Schöps, Sebastian (Darmstadt, Tech. U.) ; Vanderheyden, Benoit (Liege U.) ; Geuzaine, Christophe (Liege U.)
In this work, we present and analyze the numerical stability of two coupled finite element formulations. The first one is the h-a-formulation and is well suited for modeling systems with superconductors and ferromagnetic materials. [...]
arXiv:2106.00313.- 2021-07-26 - 12 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 8200412 Fulltext: PDF;
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3.
Simulation of Transient Effects in High-Temperature Superconducting Magnets / Bortot, Lorenzo
Particle colliders for high-energy physics are important tools for investigating the fundamental structure of matter [...]
CERN-THESIS-2021-307 - Online : TUprints, 2022-03-18. - 205 p.

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4.
High-temperature superconducting screens for magnetic field-error cancellation in accelerator magnets / Bortot, L. (CERN ; Darmstadt, Tech. U.) ; Mentink, M. (CERN) ; Petrone, C. (CERN) ; Van Nugteren, J. (CERN) ; Deferne, G. (CERN) ; Koettig, T. (CERN) ; Kirby, G. (CERN) ; Pentella, M. (CERN ; Turin Polytechnic) ; Perez, J.C. (CERN) ; Pincot, F.O. (CERN) et al.
Accelerators magnets must have minimal magnetic field imperfections for reducing particle-beam instabilities. In the case of coils made of high-temperature superconducting (HTS) tapes, the field imperfections from persistent currents need to be carefully evaluated. [...]
arXiv:2103.14354.- 2021-08-26 - 11 p. - Published in : Supercond. Sci. Technol. 34 (2021) 105001 Fulltext: PDF;
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5.
Numerical Analysis of the Screening Current-Induced Magnetic Field in the HTS Insert Dipole Magnet Feather-M2.1-2 / Bortot, Lorenzo (CERN ; Darmstadt, Tech. U.) ; Mentink, Matthias (CERN) ; Petrone, Carlo (CERN) ; Van Nugteren, Jeroen (CERN) ; Kirby, Glyn (CERN) ; Pentella, Mariano (CERN ; Polytech. Turin) ; Verweij, Arjan (CERN) ; Schöps, Sebastian (Darmstadt, Tech. U.)
Screening currents are field-induced dynamic phenomena which occur in superconducting materials, leading to persistent magnetization. Such currents are of importance in ReBCO tapes, where the large size of the superconducting filaments gives rise to strong magnetization phenomena. [...]
arXiv:2005.09467.- 2020-10-30 - 14 p. - Published in : Supercond. Sci. Technol. 33 (2020) 125008 Fulltext: PDF; Fulltext from publisher: PDF;
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6.
Analysis of short-circuit transients in the LHC main dipole circuit / Liakopoulou, A (CERN ; Twente U., Enschede) ; Annema, A J (Twente U., Enschede) ; Bortot, L (CERN ; Darmstadt, Tech. U.) ; Charifoulline, Z (CERN) ; Maciejewski, M (CERN) ; Prioli, M (INFN, Milan) ; Ravaioli, E (CERN) ; Salm, C (Twente U., Enschede) ; Schmitz, J (Twente U., Enschede) ; Verweij, A P (CERN)
After the occurrence and detection of a short circuit to ground in the LHC main dipole circuit, a fast power abort is triggered and the current in the circuit starts decaying semi-exponentially from a maximum value of 11.85 kA to zero, with a time constant of 103 s. If a short to ground occurs, the current flows through the fuse that is present in the grounding subcircuit. [...]
IOP, 2020 - 10 p. - Published in : J. Phys.: Conf. Ser. 1559 (2020) 012077 Fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012077
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7.
Fast Failures in the LHC and the future High Luminosity LHC / Lindstrom, B. (CERN ; Uppsala U.) ; Bélanger, P. (CERN) ; Bortot, L. (CERN) ; Denz, R. (CERN) ; Mentink, M. (CERN) ; Ravaioli, E. (CERN) ; Rodriguez Mateos, F. (CERN) ; Schmidt, R. (CERN) ; Uythoven, J. (CERN) ; Valette, M. (CERN) et al.
An energy of $362\:\text{MJ}$ is stored in each of the two LHC proton beams for nominal beam parameters. This will be further increased to about $700\:\text{MJ}$ in the future High Luminosity LHC (HL-LHC) and uncontrolled beam losses represent a significant hazard for the integrity and safe operation of the machine. [...]
arXiv:2005.04520.- 2020-08-12 - 27 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 081001 Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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8.
A Coupled A–H Formulation for Magneto-Thermal Transients in High-Temperature Superconducting Magnets / Bortot, Lorenzo (CERN) ; Auchmann, Bernhard (CERN) ; Garcia, Idoia Cortes (Darmstadt, Tech. U.) ; De Gersem, Herbert (Darmstadt, Tech. U.) ; Maciejewski, Michal (CERN) ; Mentink, Matthias (CERN) ; Schöps, Sebastian (Darmstadt, Tech. U.) ; Van Nugteren, Jeroen (CERN) ; Verweij, Arjan P. (CERN)
The application of high-temperature superconductors to accelerator magnets for future particle colliders is under study. Numerical methods are crucial for an accurate evaluation of the complex dynamical behavior of the magnets, especially concerning the magnetic field quality and thermal behavior. [...]
arXiv:1909.03312.- 2020-01-27 - 11 p. - Published in : IEEE Trans. Appl. Supercond. 30 (2020) 4900911 Fulltext: PDF;
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9.
LHC MD 3205: Beam Screen Shielding from QH Discharge at 70 K / Wiesner, Christoph (CERN) ; Bortot, Lorenzo (Technische Universitaet Darmstadt (DE)) ; Lindstrom, Bjorn Hans Filip (Uppsala University (SE)) ; Mentink, Matthias (CERN) ; Ravaioli, Emmanuele (CERN) ; Richtmann, Lea Caterina (Universitaet Hannover (DE)) ; Valette, Matthieu ; Wollmann, Daniel (CERN)
This note summarises the results of LHC Machine Development (MD) 3205, performed on October 31st 2018. [...]
CERN-ACC-NOTE-2020-0003. - 2020.
Full text
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10.
Conceptual Design of the FCC-hh Dipole Circuits With Integrated CLIQ Protection System / Prioli, Marco (CERN ; INFN, Milan) ; Auchmann, Bernhard (CERN ; PSI, Villigen) ; Bortot, Lorenzo (CERN) ; Maciejewski, Michał (CERN ; Lodz U. Tech. (main)) ; Salmi, Tiina (Tampere U. of Tech.) ; Verweij, Arjan (CERN)
The Future Circular Collider (FCC-hh) project is a conceptual study whose goal is to design the successor of the Large Hadron Collider, increasing the collision energy from 14 to 100 TeV. The energy stored in the 16-T superconducting dipole magnets and the length of the sectors composing the 100-km FCC tunnel are considerably larger than those in present accelerators. [...]
2019 - 9 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4703309 Fulltext: PDF;
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