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  • 1
    Article
    Article
    On Roebel Cable Geometry for Accelerator Magnet
    2016
    ISSN: 1051-8223 
    Details
    Language: English
    In: IEEE transactions on applied superconductivity, 2016-04, Vol.26 (3), p.1-5
    Description: Roebel-type cables made of a ReBCO conductor are potential candidates for high-field accelerator magnets. The necessity to promote a large effective transverse section in a Roebel cable to avoid local overstress leading to degradation in electrical performance has been recently addressed. In this paper, a new geometry of meander tapes for a Roebel cable that enhances both the transverse effective section and the current margin at crossing segments is discussed. As Roebel cables are bent at the coil ends, the modulation of the bending radius of strands along the cable pitch leads to a shift of the strands with respect to each other. The shift magnitude is analytically investigated in this paper as a function of both cable features and coil geometry. Finally, the minimum transposition pitch of Roebel cables is determined on the basis of coil characteristics.
    Subject(s): Geometry ; Superconducting cables ; EuCARD2 ; Power cables ; Shape ; Windings ; REBCO ; Accelerator magnets ; Stress ; Roebel cable
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    DOI: 10.1109/TASC.2016.2530872
    Source: IEEE Electronic Library (IEL)
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  • 2
    Article
    Article
    Magnetic levitation in two-dimensional geometry with translational invariance
    2008
    ISSN: 0021-8979 
    Details
    Language: English
    In: Journal of applied physics, 2008-11-17, Vol.104 (10), p.103904-103904-12
    Description: The development of activities in space and of the corresponding technologies requires research on the behavior of both matter and biological organisms under weightless conditions. Various methods have been invented in order to simulate weightlessness, for example, drop towers, sounding rockets, or parabolic flights. Magnetic field ground-based devices have also been developed. This paper introduces an optimization method of the magnetic field so as to obtain magnetic levitation in a two-dimensional cylindrical geometry.
    Subject(s): Cylinder (Mathematics) ; Structure ; Magnetic fields ; Analysis ; Magnetic properties ; Magnetic suspension
    ISSN: 0021-8979
    E-ISSN: 1089-7550
    DOI: 10.1063/1.3000633
    Source: American Institute of Physics (AIP) Publications
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  • 3
    Article
    Article
    The EuCARD-2 Future Magnets European Collaboration for Accelerator-Quality HTS Magnets
    2015
    ISSN: 1051-8223 
    Details
    Language: English
    In: IEEE transactions on applied superconductivity, 2015-06, Vol.25 (3), p.1-7
    Description: EuCARD-2 is a project supported by FP7-European Commission that includes, inter alia, a work-package (WP10) called "Future Magnets." This project is part of the long term development that CERN is launching to explore magnet technology at 16 T to 20 T dipole operating field, within the scope of a study on Future Circular Colliders. The EuCARD2 collaboration is closely liaising with similar programs for high field accelerator magnets in the USA and Japan. The main focus of EuCARD2 WP10 is the development of a 10 kA-class superconducting, high current density cable suitable for accelerator magnets, The cable will be used to wind a stand-alone magnet 500 mm long and with an aperture of 40 mm. This magnet should yield 5 T, when stand-alone, and will enable to reach a 15 to 18 T dipole field by placing it in a large bore background dipole of 12-15 T. REBCO based Roebel cables is the baseline. Various magnet configurations with HTS tapes are under investigation and also use of Bi-2212 round wire based cables is considered. The paper presents the structure of the collaboration and describes the main choices made in the first year of the program, which has a breadth of five to six years of which four are covered by the FP7 frame.
    Subject(s): Coils ; Superconducting cables ; High-temperature superconductors ; Accelerators Magnets ; Collaboration ; Future Magnets ; Eucard2 ; Superconducting magnets ; Conductors ; Accelerator magnets ; IR-97507 ; EC Grant Agreement nr.: FP7-EUCARD2 ; METIS-312068 ; High temperature superconductors ; Usage ; Calcium compounds ; Barium compounds ; Reorganization and restructuring ; Nuclear Experiment ; Physics
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    DOI: 10.1109/TASC.2014.2364215
    Source: IEEE Electronic Library (IEL)
    URL: https://hal.archives-ouvertes.fr/hal-01147404$$DView record in HAL
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  • 4
    Article
    Article
    Accelerator-Quality HTS Dipole Magnet Demonstrator Designs for the EuCARD-2 5-T 40-mm Clear Aperture Magnet
    2015
    ISSN: 1051-8223 
    Details
    Language: English
    In: IEEE transactions on applied superconductivity, 2015-06, Vol.25 (3), p.1-5
    Description: Future high-energy accelerators will need very high magnetic fields in the range of 20 T. The Enhanced European Coordination for Accelerator Research and Development (EuCARD-2) Work Package 10 is a collaborative push to take high-temperature superconductor (HTS) materials into an accelerator-quality demonstrator magnet. The demonstrator will produce 5 T stand alone and between 17 and 20 T when inserted into the 100-mm aperture of a Fresca-2 high-field outsert magnet. The HTS magnet will demonstrate the field strength and the field quality that can be achieved. An effective quench detection and protection system will have to be developed to operate with the HTS superconducting materials. This paper presents a ReBCO magnet design using a multistrand Roebel cable that develops a stand-alone field of 5 T in a 40-mm clear aperture and discusses the challenges associated with a good field quality using this type of material. A selection of magnet designs is presented as the result of the first phase of development.
    Subject(s): Coils ; High-temperature superconductors ; Magnetomechanical effects ; quench protection ; Magnetoacoustic effects ; Superconducting magnets ; ReBCO ; Superconducting cables ; YBCO Roebel cable ; Cable insulation ; Accelerator magnet ; EuCARD-2 ; HTS magnet design ; High temperature superconductors ; Usage ; Barium compounds ; Analysis ; Research ; Magnetic fields
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    DOI: 10.1109/TASC.2014.2361933
    Source: IEEE Electronic Library (IEL)
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  • 5
    Article
    Article
    Status of the Demonstrator Magnets for the EuCARD-2 Future Magnets Project
    2016
    ISSN: 1051-8223 
    Details
    Language: English
    In: IEEE transactions on applied superconductivity, 2016-04, Vol.26 (3), p.1-7
    Description: EuCARD-2 is a project partly supported by FP7 European Commission aiming at exploring accelerator magnet technology for 20-T dipole operating field. The EuCARD-2 collaboration is liaising with similar programs for high-field magnets in the U.S. and Japan. EuCARD-2 focuses, through the work package 10 "future magnets," on the development of a 10-kA-class superconducting high-current-density cable suitable for accelerator magnets, for a 5-T stand-alone dipole of 40-mm bore and about 1-m length. After stand-alone testing, the magnet will be inserted in a large bore background dipole, 10-18 T. This paper reports on the design and development of models, which are called Feather0, wound with REBCO Roebel cable. Based on aligned block design to take advantage of the anisotropy of the REBCO tapes, Feather0 is a precursor of Feather2, which should reach the project goals in 2016. Feather0 is planned to be tested both in stand alone and as an insert mounted in the CERN Fresca facility providing 10-T background field. The progress of other designs pursued in the collaboration, one based on classical ϑ layout with Roebel cable and the other based on coil block with stacked tape cable, will be also reported.
    Subject(s): Superconducting cables ; Accelerators Magnets ; Power cables ; Magnetomechanical effects ; Windings ; Future Magnets ; Superconducting magnets ; High-Temperature-Superconductors ; EuCARD-2 ; Perpendicular magnetic anisotropy ; CLIQ ; Condensed Matter Physics ; Electrical and Electronic Engineering ; Electronic, Optical and Magnetic Materials ; future magnets ; Accelerators magnets ; higherature-superconductors ; superconducting magnets ; Engineering Sciences ; Electric power
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    DOI: 10.1109/TASC.2016.2528544
    Source: IEEE Electronic Library (IEL)
    URL: https://hal.archives-ouvertes.fr/hal-02277762$$DView record in HAL
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  • 6
    Article
    Article
    Predicting the Quench Behavior of the LHC Dipoles During Commissioning
    2010
    ISSN: 1051-8223 
    Details
    Language: English
    In: IEEE transactions on applied superconductivity, 2010-06, Vol.20 (3), p.135-139
    Description: The LHC hardware commissioning has shown a considerable difference of performance between the three dipole manufacturers (Firm1, Firm2 and Firm3). More than 90% of the quenches occurred in the dipoles made by Firm3, less than 10% in Firm2, and no one in Firm1. In this paper we propose a Monte-Carlo method based on the quench performance data of individual magnets that accounts for this behavior. The model relies on the data of the virgin training and on correlations with quench after a thermal cycle as measured on a sample of magnets. This model is used to derive estimates of the training behavior in the machine. A comparison with data gathered during the hardware commissioning shows that the model works well for low fields, and that, starting from fields corresponding to an energy of about 6.3 TeV, a slower training in the magnets of one manufacturer is observed.
    Subject(s): Superconducting cables ; Magnetic field measurement ; Large Hadron Collider ; Thermal quenching ; Superconducting magnets ; Hardware ; Accelerator magnets ; Virtual manufacturing ; Current density ; Stress ; Testing ; Electrical engineering. Electrical power engineering ; Cyclic accelerators and storage rings ; Experimental methods and instrumentation for elementary-particle and nuclear physics ; Exact sciences and technology ; Applied sciences ; Electromagnets ; Physics ; Nuclear physics ; Various equipment and components ; Lorentz transformations ; Monte Carlo method ; Usage ; Technical institutes ; Design and construction ; Management ; Colliders (Nuclear physics)
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    DOI: 10.1109/TASC.2010.2043076
    Source: IEEE Electronic Library (IEL)
    URL: http://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=22862487$$DView record in Pascal Francis
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  • 7
    Article
    Article
    Engineering Design and Manufacturing Challenges for a Wide-Aperture, Superconducting Quadrupole Magnet
    2012
    ISSN: 1051-8223 
    Details
    Language: English
    In: IEEE transactions on applied superconductivity, 2012-06, Vol.22 (3), p.4001804-4001804
    Description: The design and construction of a wide-aperture, superconducting quadrupole magnet for the LHC insertion region is part of a study towards a luminosity upgrade of the LHC at CERN. The engineering design of components and tooling, the procurement, and the construction work presented in this paper includes innovative features such as more porous cable insulation, a new collar structure allowing horizontal assembly with a hydraulic collaring press, tuning shims for the adjustment of field quality, a fishbone like structure for the ground-plane insulation, and an improved quench-heater design. Rapid prototyping of coil-end spacers and trial-coil winding led to improved shapes, thus avoiding the need to impregnate the ends with epoxy resin, which would block the circulation of helium. The magnet construction follows established procedures for the curing and assembly of the coils, in order to match the workflow established in CERN's "large magnet facility." This requirement led to the design and procurement of a hydraulic press allowing for both a vertical and a horizontal position of the coil-collar pack, as well as a collapsible assembly mandrel, which guarantees the pack's four-fold symmetry during collaring. The assembly process has been validated with the construction of two short models, instrumented with strain gauges and capacitive pressure transducers. This also determines the final parameters for coil curing and shim sizes.
    Subject(s): Coils ; tooling ; quadrupole ; quench heaters ; Large Hadron Collider ; Magnetic separation ; Heating ; Manufacturing process ; superconducting accelerator magnets ; Superconducting magnets ; Cable insulation ; Electrical engineering. Electrical power engineering ; Cyclic accelerators and storage rings ; Miscellaneous ; Exact sciences and technology ; Electronics ; Physics ; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices ; Experimental methods and instrumentation for elementary-particle and nuclear physics ; Applied sciences ; Electromagnets ; Acoustic wave devices, piezoelectric and piezoresistive devices ; Nuclear physics ; Various equipment and components ; Technology application ; Usage ; Superconductors ; Transducers ; Stress-strain curves ; Magnets, Permanent ; Design and construction ; Simulation methods
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    DOI: 10.1109/TASC.2012.2185770
    Source: IEEE Electronic Library (IEL)
    URL: http://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26645888$$DView record in Pascal Francis
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  • 8
    Article
    Article
    Protective efficacy of adenovirus/protein vaccines against SIV challenges in rhesus monkeys
    2015
    ISSN: 0036-8075 
    Details
    Language: English
    In: Science (American Association for the Advancement of Science), 2015-07-17, Vol.349 (6245), p.320-324
    Description: Preclinical studies of viral vector–based HIV-1 vaccine candidates have previously shown partial protection against neutralization-resistant virus challenges in rhesus monkeys. In this study, we evaluated the protective efficacy of adenovirus serotype 26 (Ad26) vector priming followed by purified envelope (Env) glycoprotein boosting. Rhesus monkeys primed with Ad26 vectors expressing SIVsmE543 Env, Gag, and Pol and boosted with AS01B-adjuvanted SIVmac32H Env gp140 demonstrated complete protection in 50% of vaccinated animals against a series of repeated, heterologous, intrarectal SIVmac251 challenges that infected all controls. Protective efficacy correlated with the functionality of Env-specific antibody responses. Comparable protection was also observed with a similar Ad/Env vaccine against repeated, heterologous, intrarectal SHIV-SF162P3 challenges. These data demonstrate robust protection by Ad/Env vaccines against acquisition of neutralization-resistant virus challenges in rhesus monkeys.
    Subject(s): REPORTS ; Gene Products, gag - immunology ; Gene Products, env - immunology ; Genetic Vectors - immunology ; AIDS Vaccines - immunology ; Histocompatibility Antigens Class I - immunology ; Male ; Histocompatibility Antigens Class I - genetics ; Macaca mulatta ; Adoptive Transfer ; Adenovirus Vaccines - immunology ; Simian Acquired Immunodeficiency Syndrome - prevention & control ; Antibodies, Neutralizing - immunology ; HIV-1 - immunology ; Animals ; Immunization, Secondary ; SAIDS Vaccines - immunology ; Gene Products, pol - immunology ; Female ; Simian Immunodeficiency Virus - immunology ; Index Medicus
    ISSN: 0036-8075
    E-ISSN: 1095-9203
    DOI: 10.1126/science.aab3886
    Source: Single Journals
    Source: Academic Search Ultimate
    Source: © ProQuest LLC All rights reserved〈img src="https://exlibris-pub.s3.amazonaws.com/PQ_Logo.jpg" style="vertical-align:middle;margin-left:7px"〉
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  • 9
    Article
    Article
    Testing Results for Nb-Ti, 120-mm-Aperture, Low-B Quadrupole Models for the LHC High-Luminosity Insertion
    2013
    ISSN: 1051-8223 
    Details
    Language: English
    In: IEEE transactions on applied superconductivity, 2013-06, Vol.23 (3), p.4002105-4002105
    Description: The design and construction of a 120-mm wide-aperture, Nb-Ti superconducting quadrupole magnet for the Large Hadron Collider (LHC) insertion region is part of a study towards a luminosity upgrade of the LHC at CERN, envisaged for 2020-22. The main challenges for this accelerator quality magnet are to operate reliably with the high heat and radiation loads that are predicted in the insertion magnet regions. Calculations give approximately 500 Watts over the 30-m-long string of insertion magnets, while today LHC is operating for a nominal heat load of 12 Watts. To extract this heat, the model magnets incorporate new features: Open cable insulation, open ground insulation, open magnet structure, and a quench heater that has open channels to help extract the steady state heat load. This paper presents results from tests at room temperature and 1.8 K for the initial model magnet. We report magnet training, transfer function and field quality measurements, quench heater performance, and heat extraction studies using imbedded heaters to simulate the deposited beam heating profile.
    Subject(s): Coils ; tooling ; quadrupole ; quench heaters ; magnetic shimming ; HL-Large Hadron Collider (LHC) ; Superconducting magnets ; Cold testing ; Temperature measurement ; Magnetic field measurement ; Magnetic separation ; Heating ; superconducting accelerator magnets ; manufacturing process ; heat extraction ; Saturation magnetization ; Electrical engineering. Electrical power engineering ; Cyclic accelerators and storage rings ; Miscellaneous ; Experimental methods and instrumentation for elementary-particle and nuclear physics ; Exact sciences and technology ; Applied sciences ; Electromagnets ; Physics ; Nuclear physics ; Various equipment and components ; Usage ; Particle accelerators ; Transfer functions ; Mechanical properties ; Design and construction ; Magnetic fields ; Niobium ; Magnetic properties
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    DOI: 10.1109/TASC.2013.2247453
    Source: IEEE Electronic Library (IEL)
    URL: http://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27529377$$DView record in Pascal Francis
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  • 10
    Article
    Article
    Magnetic Compensation of Gravity and Centrifugal Forces
    2009
    ISSN: 0938-0108 
    Details
    Language: English
    In: Microgravity science and technology, 2009-01, Vol.21 (1), p.123-127
    Description: This paper deals with the theoretical combination of magnetic forces, centrifugal forces, and gravity acting on low-χ magnetic fluids contained within a cylindrical shaped zone with a horizontal axis. The magnetic field is created by a combination of both quadrupolar winding and dipolar fields, as exists in superconducting coils developed for particle accelerators. Such a ground based device, if static, simulates a rotation – in space conditions – of a paramagnetic substance such as liquid oxygen. When the cylinder rotates, it creates exact gravity compensation – on Earth – for diamagnetic fluids such as hydrogen. These results go beyond a previous result that found it impossible to reach perfect magnetic compensation of gravity in a 3D domain.
    Subject(s): Engineering ; Mechanics, Fluids, Thermodynamics ; Extraterrestrial Physics, Space Sciences ; Magnet ; Centrifugal forces ; Aerospace Technology and Astronautics ; Microgravity ; Magnetic levitation
    ISSN: 0938-0108
    E-ISSN: 1875-0494
    DOI: 10.1007/s12217-008-9056-x
    Source: Alma/SFX Local Collection
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