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Characterisation of SiC Varistor Quench Protection Operating at 4 Kelvin for Use With Superconducting Magnets
/ Galvin, Tom ; Kirby, Glyn (CERN) ; Pepitone, Kevin (Uppsala U.) ; Coll, Dominic ; Twin, Andrew (Oxford Instruments) ; Warren, David (Oxford Instruments) ; Ball, Steven (Oxford Instruments)
Silicon carbide (SiC) composite high-energy varistors have been demonstrated as a viable alternative to linear resistors as energy extraction devices during an abrupt loss of superconductivity in a magnet, called a quench. These have typically been installed external to the cryostat at ambient temperatures, but for some superconducting magnets it may be beneficial to mount the varistors within the cryostat in vacuum, a gaseous environment, or submerged in liquid cryogens. [...]
2023 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4701005
In : Applied Superconductivity Conference, Honolulu, Hawaii, United States, 23 - 28 Oct 2022
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Evaluation of the Parallel-Scheme Varistors as Energy-Extraction System for a Test Facility of Superconducting Accelerator Magnet
/ Suzuki, K (KEK, Tsukuba) ; Ikemoto, Y (KEK, Tsukuba) ; Nakamoto, T (KEK, Tsukuba) ; Ogitsu, T (KEK, Tsukuba) ; Okada, N (KEK, Tsukuba) ; Sugano, M (KEK, Tsukuba) ; Kirby, G (CERN) ; Galvin, T (Unlisted, GB)
A varistor is a non-linear V - I resistor and its feature helps to extract stored energy of the magnet quickly while suppressing the magnet voltage. High Energy Accelerator Research Organization (KEK) decided to install the varistor for the test facility in order to conduct quench training of a superconducting magnet safely. [...]
2024 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 9501407
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Experimental Examples of Quench Protection With Varistors to Reduce Quench Voltages and Hot-Spot Peak Temperatures
/ Galvin, T ; Kirby, G A (CERN) ; Coll, D ; Mangiarotti, F J (CERN) ; Wu, W ; Ou, X ; Xu, Q (Beijing, Inst. High Energy Phys.) ; Zheng, S ; Nakamoto, T (KEK, Tsukuba) ; Suzuki, K (KEK, Tsukuba)
Superconducting magnet protection must address two main areas of the magnet and circuit performance, namely conductor hot-spot temperatures and circuit voltages. The maximum hot-spot temperatures and voltages occur during the superconductor's transition called a quench and the subsequent energy extraction. [...]
2022 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 32 (2022) 4702505
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.4702505
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Low-Temperature Annealing of Electron, Neutron, and Proton Irradiation Effects on SiC Radiation Detectors
/ Rafí, Joan Marc (Barcelona, Inst. Microelectron.) ; Pellegrini, Giulio (Barcelona, Inst. Microelectron.) ; Godignon, Philippe (Barcelona, Inst. Microelectron.) ; Rius, Gemma (Barcelona, Inst. Microelectron.) ; Dauderys, Vainius (Barcelona, Inst. Microelectron.) ; Tsunoda, Isao (Kumamoto Nat. Coll. Tech.) ; Yoneoka, Masashi (Kumamoto Nat. Coll. Tech.) ; Takakura, Kenichiro (Kumamoto Nat. Coll. Tech.) ; Kramberger, Gregor (Stefan Inst., Ljubljana) ; Moll, Michael (CERN)
Silicon carbide (SiC) is a wide bandgap semiconductor with outstanding properties that make it especially appropriate for radiation monitoring in radiation harsh environments and for elevated temperature operation. In this work, radiation effects in electron-, neutron-, and proton-irradiated 4H-SiC p-n junction diodes are investigated by means of electrical characterization, including current–voltage characteristics measured at different temperatures ranging from −50 °C to +200°C. [...]
2023 - 12 p.
- Published in : IEEE Trans. Nucl. Sci. 70 (2023) 2285-2296
External link: accepted manuscript
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Varistor Insulation for HTS Magnets
/ Kirby, G (CERN) ; Galvin, T ; Coll, D ; Stevenson, R ; Livesey, P
A variable resistance thin dielectric insulation coating for REBCO tape HTS coils has been developed. This new type of insulation system switches between high and low resistance, after an increase in inter-turn voltage. [...]
2022 - 4 p.
- Published in : IEEE Trans. Appl. Supercond. 32 (2022) 7700604
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.7700604
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A fast quench protection system for high-temperature superconducting magnets
/ van Nugteren, Jeroen (CERN) ; Murtomäki, Jaakko Samuel (CERN) ; Ruuskanen, Janne (Tampere U. of Tech.) ; Kirby, Glyn (CERN) ; Hagen, Per (CERN) ; de Rijk, Gijs (CERN) ; Ten Kate, Herman (CERN) ; Bottura, Luca (CERN) ; Rossi, Lucio (CERN)
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). [...]
2018 - 8 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2018) 4700108
In : 25th International Conference on Magnet Technology, Amsterdam, The Netherlands, 27 Aug - 1 Sep 2017, pp.4700108
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Modeling Results of the Quench Behavior of a Nb-Ti Canted-Cosine-Theta Corrector Magnet for LHC
/ Bagni, T (Uppsala U.) ; Ahl, A (Scanditronix Instrument, Uppsala) ; Almström, M (Linnaeus U.) ; Canale, M (CERN) ; Dugic, I (Linnaeus U.) ; Emilsson, F (AMACC, Uppsala) ; Gentini, L (CERN) ; Haralanova, V (Linnaeus U.) ; Johansson, M (Unlisted, SE) ; Karlsson, G (Linnaeus U.) et al.
A newly designed superconducting magnet of the Canted-Cosine-Theta (CCT) type was developed as a result of a collaboration between Swedish universities (Uppsala and Linneaus) and Swedish industries. This magnet was designed to function as a replacement of the present LHC orbit corrector magnets, which are approaching their end of life due to the radiation load. [...]
2024 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4001105
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