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Electrical Insulation for Magnets
/ Piccin, Roland (speaker) (CERN)
Magnets for particle accelerators are electrical machines subjected to severe operating conditions such as extreme temperatures, radiations, high mechanical stresses, and in certain cases high voltages. A robust electrical insulation is vital to guarantee a high reliability and availability of the accelerator machines. [...]
2023 - 3256.
CERN Accelerator School; CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
External links: Talk details; Event details
In : CAS course on "Normal- and Superconducting Magnets", 19 November - 02 December 2023, St. Pölten, Austria
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Fracture Toughness, Radiation Hardness, and Processibility of Polymers for Superconducting Magnets
/ Gaarud, Anders (CERN) ; Scheuerlein, Christian (CERN) ; Parragh, David Mate (CERN) ; Clement, Sébastien (CERN) ; Bertsch, Jacob (CERN) ; Urscheler, Cedric (CERN) ; Piccin, Roland (CERN) ; Ravotti, Federico (CERN) ; Pezzullo, Giuseppe (CERN) ; Lach, Ralf (Julich, Forschungszentrum)
High fracture toughness at cryogenic temperature and radiation hardness can be conflicting requirements for the resins for the impregnation of superconducting magnet coils. The fracture toughness of different epoxy-resin systems at room temperature (RT) and at 77 K was measured, and their toughness was compared with that determined for a polyurethane, polycarbonate (PC) and poly(methyl methacrylate) (PMMA). [...]
2024 - 17 p.
- Published in : Polymers 16 (2024) 1287
Fulltext: PDF;
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Effect of Irradiation Temperature and Atmosphere on Aging of Epoxy Resins for Superconducting Magnets
/ Parragh, David Mate (CERN) ; Scheuerlein, Christian (CERN) ; Martin, Noémie (Lyon U.) ; Piccin, Roland (CERN) ; Ravotti, Federico (CERN) ; Pezzullo, Giuseppe (CERN) ; Koettig, Torsten (CERN) ; Lellinger, Dirk (Unlisted, DE)
The superconducting magnets of future particle accelerators will be exposed to high
irradiation doses at cryogenic temperatures. To investigate the effect of irradiation temperature
and atmosphere on the aging behavior, we have characterized the changes in thermomechanical
properties of six epoxy resins for potential use in superconducting magnets after irradiation up to
20 MGy in ambient air, inert gas, and liquid helium. [...]
2024 - 15 p.
- Published in : MDPI Polymers 16 (2024) 407
Fulltext: PDF;
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Mitigation Plans for Insulation Failures and Arcing in the ITER Magnets
/ Liao, Min (Euratom, St. Paul Lez Durance) ; Mitchell, Neil (Euratom, St. Paul Lez Durance) ; Piccin, Roland (CERN) ; Luongo, Cesar ; Ye, Yulong (Euratom, St. Paul Lez Durance) ; Clayton, Nicolas (Euratom, St. Paul Lez Durance) ; Schild, Thierry (Euratom, St. Paul Lez Durance) ; Hoa, Christine (Euratom, St. Paul Lez Durance)
The ITER magnet system contains 50 GJ of energy in 3 main coil sets and feeders. Lesson learned from arc incidents in JT-60SA and CS module 3 cold test show the consequences of insulation failure. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4200305
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Environmental Stress Cracking of Thermoplastic Polyimide Insulated Wires
/ Piccin, R (CERN) ; Rigaud, J S (CERN) ; Santillana, I A (CERN) ; Buchanan, K E (CERN) ; Ternova, D (CERN) ; Mitchell, N (Euratom, St. Paul Lez Durance) ; Liao, M (Euratom, St. Paul Lez Durance) ; Luongo, C (EUROfusion Consortium, Garching)
Polyimide is often the first choice to insulate instrumentation and magnet wires working under demanding environmental and operating conditions since it shows good mechanical properties at low temperatures and high radiation resistance. Nevertheless, we have recently discovered that thermoplastic polyimide (TPI) insulated wires may suffer an accelerated brittle failure from a combination of environmental and mechanical stress, summarized as environmental stress cracking (ESC). [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 7700405
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7.
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Irradiation Induced Aging of Epoxy Resins for Impregnation of Superconducting Magnet Coils
/ Parragh, D M (CERN) ; Scheuerlein, C (CERN) ; Piccin, R (CERN) ; Ravotti, F (CERN) ; Pezzullo, G (CERN) ; Ternova, D (CERN) ; Taborelli, M (CERN) ; Lehner, M (Vienna, Tech. U., Atominst.) ; Eisterer, M (Vienna, Tech. U., Atominst.)
Understanding the effect of radiation on the functional properties of epoxy resins is crucial for their application in future particle accelerators like the Future Circular Collider (FCC). We compare the irradiation induced aging rates of six epoxy resin systems that can be used for the vacuum impregnation of magnet coils. [...]
2024 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 1-7
Fulltext: PDF;
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8.
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Final Design of ITER In-Vessel Coils and Manufacturing of In-Vessel Coil Conductor
/ Encheva, Anna (ITER) ; Bontemps, Vincent (ITER) ; Fichera, Claudio (ITER) ; Laquiere, Julien (ITER) ; Macioce, Davide (ITER) ; Mariani, Nicola (ITER) ; Piccin, Roland (ITER) ; Tronza, Vladimir (ITER) ; Vostner, Alexander (ITER) ; Sgobba, Stefano (CERN)
Following a decision made at the ITER Council in November 2013, two types of in-vessel coils (IVCs), namely, edge-localized mode (ELM) coils to mitigate ELMs and vertical stability (VS) coils to provide vertical stabilization of the plasma, have been incorporated in the ITER baseline design. The in-vessel environment is severe, characterized by large transient electromagnetic fields, high radiation flux, and high temperature. [...]
2022 - 6 p.
- Published in : IEEE Trans. Plasma Sci. 50 (2022) 4298-4303
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Characterization of low temperature high voltage axial insulator breaks for the ITER cryogenic supply line
/ Fernandez Pison, P (CERN ; Carlos III U., Madrid) ; Sgobba, S (CERN) ; Santillana, I Aviles (CERN ; Carlos III U., Madrid) ; Langeslag, S A E (CERN) ; Su, M (Euratom, St. Paul Lez Durance) ; Piccin, R (Euratom, St. Paul Lez Durance) ; Journeaux, J Y (Euratom, St. Paul Lez Durance) ; Laurenti, A (Euratom, St. Paul Lez Durance) ; Pan, W (Hefei, Inst. Plasma Phys.)
Cable-in-conduit conductors of the ITER magnet system are directly cooled by supercritical helium. Insulation breaks are required in the liquid helium feed pipes to isolate the high voltage system of the magnet windings from the electrically grounded helium coolant supply line. [...]
2017 - 8 p.
- Published in : IOP Conf. Ser. Mater. Sci. Eng. 279 (2017) 012007
Fulltext: PDF; External link: Fulltext
In : 2017 Cryogenic Engineering Conference and International Cryogenic Materials Conference, Madison, WI, USA, 9 - 13 Jul 2017, pp.012007
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Electrical insulation testing for ITER fusion tokamak
/ Gaxiola, E (Euratom, St. Paul Lez Durance) ; Evans, D (Euratom, St. Paul Lez Durance) ; Laquiere, J (Euratom, St. Paul Lez Durance) ; Laurenti, A (Euratom, St. Paul Lez Durance) ; Libeyre, P (Euratom, St. Paul Lez Durance) ; Lyraud, C (Euratom, St. Paul Lez Durance) ; Piccin, R (Euratom, St. Paul Lez Durance) ; Rinaudo, G (Euratom, St. Paul Lez Durance) ; Simon, F (Euratom, St. Paul Lez Durance) ; Vollmann, T (Euratom, St. Paul Lez Durance) et al.
The uniqueness of the ITER fusion project drives purpose and scope here to fulfil (functional) Procurement Arrangement (PA) requirements for the Central Solenoid (CS) and Correction Coil (CC) magnets' electrical insulation [1-3]; as used and undertaken for covering high voltage testing operations of the magnet coil winding pack (WP) vacuum pressure insulation (VPI) beam qualification, followed in 2016 by start of magnets series production in the USA and China [1, 2]. Useful to be considered common state-of-the-art electrical power components testing practices [3, 4] are presented here as performed to verify that the integrity and insulation of the various components are within acceptable limits during different phases of the fabrication and to certify acceptance on delivery of the complete coils. [...]
2017 - 4 p.
- Published in : 10.1109/EIC.2017.8004670
In : 35th IEEE Electrical Insulation Conference, Baltimore, MD, USA, 11 - 14 Jun 2017, pp.408-411
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