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  • 1
    Article
    Article
    2021
    ISSN: 2410-390X 
    Language: English
    In: Instruments, 2021-02-23, Vol.5 (1), p.8
    Description: In view of the preparation for a post-LHC collider, in 2010 the high-energy physics (HEP) community started to discuss various options, including the use of HTS for very high-field dipoles. Therefore, a small program was begun in Europe that aimed at exploring the possibility of using HTS for accelerator-quality magnets. Based on various EU-funded programs, though at modest levels, it has enabled the European community of accelerator magnet research to start getting experience in HTS and address a few issues. The program was based on the use of REBa2Cu3O7−x (REBCO) tapes to form 10 kA Roebel cables to wind small dipoles of 30–40 mm aperture in the 5 T range. The dipoles are designed to be later inserted in a background dipole field (in Nb3Sn), to reach eventually a field level in the 16–20 T range, beyond the reach of Low Temperature Superconductors (LTS). The program is currently underway: more than 1 km of high-performance tape (Je 〉 500 A/mm2 at 20 T, 4.2 K) has been manufactured and characterized, various 30 m long Roebel cables have been assembled and validated up to 13 kA, a few dipoles have been wound and tested, reaching 4.5 T in stand-alone (while a dipole made from flat race track coils exceeded 5 T using stacked tape cable), and tests in background field are being organized.
    Subject(s): accelerator magnets ; high current density HTS ; Roebel cables ; collider magnets ; superconducting HTS magnets
    ISSN: 2410-390X
    E-ISSN: 2410-390X
    Source: Directory of Open Access Journals
    Source: Alma/SFX Local Collection
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  • 2
    Language: English
    In: IEEE transactions on applied superconductivity, 2012-06, Vol.22 (3), p.4002008-4002008
    Description: The Large Hadron Collider is working at about half its design value, limited by the defective splices of the magnet interconnections. While the full energy will be attained after the splice consolidation in 2014, CERN is preparing a plan for a Luminosity upgrade (High Luminosity LHC) around 2020 and has launched a pre-study for exploring an Energy upgrade (High Energy LHC) around 2030. Both upgrades strongly rely on advanced accelerator magnet technology, requiring dipoles and quadrupoles of accelerator quality and operating fields in the 11-13 T range for the luminosity upgrade and 16-20 T range for the energy upgrade. The paper will review the last ten year of Nb 3 Sn accelerator magnet R&D and compare it to the needs of the upgrades and will critically assess the results of the Nb 3 Sn and HTS technology and the planned R&D programs also based on the inputs of first year of LHC operation.
    Subject(s): Coils ; Large Hadron Collider ; Magnetomechanical effects ; Magnetic domains ; Niobium-tin ; Superconducting magnets ; Accelerator magnets ; Magnetic tunneling ; large-scale systems ; Electrical engineering. Electrical power engineering ; Cyclic accelerators and storage rings ; Exact sciences and technology ; Electronics ; Design. Technologies. Operation analysis. Testing ; Physics ; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices ; Integrated circuits ; Experimental methods and instrumentation for elementary-particle and nuclear physics ; Applied sciences ; Electromagnets ; Nuclear physics ; Various equipment and components ; Accelerometers ; Technology application ; Particle beams ; Usage ; Innovations ; High temperature superconductors ; Magnets, Permanent ; Mathematical optimization
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    Source: IEEE Electronic Library (IEL)
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  • 3
    Language: English
    In: Superconductor science & technology, 2019-08-22, Vol.32 (10), p.100501
    ISSN: 0953-2048
    E-ISSN: 1361-6668
    Source: IOPscience extra
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  • 4
    Language: English
    In: IEEE transactions on applied superconductivity, 2019-08, Vol.29 (5), p.1-8
    Description: Very high electromagnetic forces are generated in the superconducting coils of high field accelerator magnets. The cables, which are used to wind the coils, can withstand limited pressure levels and strains generated during the powering without degradation. To protect the cables from mechanical damage, reliable prediction of strain and stress inside the coil is paramount for designing suitable support structure of the magnet. This is naturally done before a magnet is built and tested, which emphasizes the need for reliable modeling. Conventionally, the mechanics in superconducting coils are modeled assuming homogenized material properties inside a homogenized coil volume. Using this so-called coil block approach, predicting the actual cable strain or stress inside the homogenized volume is unreliable. In order to predict reliably the stress in the cable, more detailed representation of the modeling domain is needed. This paper presents a workflow to perform a detailed mechanical analysis using finite-element analysis following the envisioned and more detailed approach. As an example, a high field 20 T+ magnet with clover leaf ends is studied, and results are discussed. The results reveal considerable difference between the behavior of modeled homogenized coil blocks and coils where turns are individually considered.
    Subject(s): Coils ; Solid modeling ; quadrupoles ; modeling ; Magnetomechanical effects ; correctors ; simulation ; Superconducting magnets ; Stress ; Strain ; superconducting magnet mechanical factors ; finite element methods ; magnet supports ; Magnetic domains ; computer aided engineering ; magnet structure ; Accelerator magnets: dipoles ; HTS magnets
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    Source: IEEE Electronic Library (IEL)
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  • 5
    Language: English
    In: IEEE transactions on applied superconductivity, 2019-01, Vol.29 (1), p.1-8
    Description: For reaching very high magnetic fields in fully superconducting magnets, beyond 16 T for particle accelerators dipoles and beyond 23 T for solenoids, the use of high-temperature superconductors (HTS) is unavoidable. Due to the high minimum quench energy in HTS these coils are much more difficult to protect against quenches using conventional methods, such as quench heaters or coupling loss induced quench (CLIQ). Although it is possible to use a dump resistor on a short HTS magnet, extracting the energy externally, this does not provide a solution for longer magnets or magnets operated in a string, because the extraction voltage becomes unacceptably high. Here, a method named E 3 SPreSSO (External Energy Extraction Symbiotic Protection System for Series Operation) is proposed that allows for fast energy extraction in HTS magnets. The E 3 SPreSSO comprises of units with a near-zero self-inductance superconducting circuit, connected in series with the main magnet. When the protection is triggered, these devices are turned resistive, using quench heaters, overcurrent or CLIQ, causing them to absorb the energy of the system. The units can be located outside the main magnet and do not generate magnetic field. Therefore, it is possible to use relatively cost-efficient and robust Nb-Ti or possibly MgB 2 (at higher temperatures). This paper introduces the concept and provides an analytical method weighing the different options for designing the E 3 SPreSSO units themselves.
    Subject(s): Coils ; Resistance ; Heating systems ; Resistors ; High-temperature superconductors ; quench protection ; Superconducting magnets ; High-temperature-superconductors (HTS) ; Magnetic circuits ; switch
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    Source: IEEE Electronic Library (IEL)
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  • 6
    Article
    Article
    2018
    ISSN: 1051-8223 
    Language: English
    In: IEEE transactions on applied superconductivity, 2018-06, Vol.28 (4), p.1-1
    ISSN: 1051-8223
    E-ISSN: 1558-2515
    Source: IEEE Electronic Library (IEL)
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  • 7
    Language: English
    In: Superconductor science & technology, 2016-04-07, Vol.29 (6), p.60501
    ISSN: 0953-2048
    E-ISSN: 1361-6668
    Source: IOPscience extra
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  • 8
    Language: English
    In: Superconductor science & technology, 2010-03-01, Vol.23 (3), p.034001
    Subject(s): Electrical engineering. Electrical power engineering ; Applied sciences ; Electromagnets ; Various equipment and components ; Exact sciences and technology
    ISSN: 0953-2048
    E-ISSN: 1361-6668
    Source: IOPscience extra
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  • 9
    Language: English
    In: Medical microbiology and immunology, 2019-04-01, Vol.208 (2), p.205-213
    Description: Pseudomonas aeruginosa (Pa) detection in the paranasal sinuses may help to prevent or postpone bacterial aspiration to the lower airways (LAW) and chronic lung infection in cystic fibrosis (CF). We assessed the ability of an ELISA test for measurement of specific Pa secretory IgA (sIgA) in saliva (a potential marker of sinus colonization) to early detect changes in the Pa LAW status (indicated by microbiological sputum or cough swab culture and specific serum IgG levels) of 65 patients for three years, in different investigation scenarios. Increased sIgA levels were detected in saliva up to 22 months before changes in culture/serology. Patients who remained Pa-positive had significantly increased sIgA levels than patients who remained Pa-negative, both at the baseline (39.6 U/mL vs. 19.2 U/mL; p = 0.02) and at the end of the follow-up (119.4 U/mL vs. 25.2 U/mL; p 〈 0.001). No association was found between sIgA levels in saliva and emergence or recurrence of Pa in the LAW. A positive median sIgA result in the first year of follow-up implied up to 12.5-fold increased risk of subsequent Pa exposure in the LAW. Our test detected early changes in the P. aeruginosa LAW status and risk of exposure to P. aeruginosa in the LAW with two years in advance. Comparison with sinus culture is needed to assess the test’s ability to identify CF patients in need of a sinus approach for Pa investigation, which could provide opportunities of Pa eradication before its aspiration to the lungs.
    Subject(s): Respiratory tract infections ; Medical Microbiology ; Biomedicine ; Immunology ; Cystic fibrosis ; Pseudomonas aeruginosa ; Secretory IgA ; Diagnosis ; Saliva ; Virology ; Pediatrics ; Immune response ; Immunoglobulin A ; Analysis ; Index Medicus
    ISSN: 0300-8584
    E-ISSN: 1432-1831
    Source: Alma/SFX Local Collection
    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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  • 10
    Book
    Book
    2015
    ISBN: 9789814675468  ISBN: 9814675466  ISBN: 9789814675475  ISBN: 9814675474 
    Language: English
    Description: This book provides a broad introduction to the physics and technology of the High Luminosity Large Hadron Collider (HL-LHC). This new configuration of the LHC is one of the major accelerator projects for the next 20 years and will give new life to the LHC after its first 15-year operation. Not only will it allow more precise measurements of the Higgs boson and of any new particles that might be discovered in the next LHC run, but also extend the mass limit reach for detecting new particles. The HL-LHC is based on the innovative accelerator magnet technologies capable of generating 11-13 Tesla fields, with effectiveness enhanced by use of the new Achromatic Telescopic Squeezing scheme, and other state-of-the-art accelerator technologies, such as superconducting compact RF crab cavities, advanced collimation concepts, and novel power technology based on high temperature superconducting links.The book consists of a series of chapters touching on all issues of technology and design, and each chapter can be read independently. The first few chapters give a summary of the whole project, of the physics motivation and of the accelerator challenges. The subsequent chapters cover the novel technologies, the new configurations of LHC and of its injectors as well as the expected operational implications. Altogether, the book brings the reader to the heart of technologies for the leading edge accelerator and gives insights into next generation hadron colliders.
    Subject(s): Experimental Physics ; Scientific Instruments ; High Energy Colliders, Large Hadron Collider, LHC Upgrades, High Luminosity Colliders, Superconducting Accelerators, High Field Superconducting Magnets, Crab Cavities, Advanced Collimators, Superconducting Links ; Applied Sciences ; Accelerator Physics ; Experiments & Projects ; SCIENCE ; Physics ; High Field Superconducting Magnets ; Large Hadron Collider ; High Energy Colliders ; Superconducting Accelerators ; Advanced Collimators ; High Luminosity Colliders ; LHC Upgrades ; Crab Cavities ; Superconducting Links
    ISBN: 9789814675468
    ISBN: 9814675466
    ISBN: 9789814675475
    ISBN: 9814675474
    Source: World Scientific Open
    Source: DOAB: Directory of Open Access Books
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