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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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2.
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Quench Protection of Very Large, 50-GJ-Class, and High-Temperature-Superconductor-Based Detector Magnets
/ Mentink, Matthias (CERN) ; Dudarev, Alexey (CERN) ; Mulder, Tim (CERN) ; Van Nugteren, Jeroen (CERN) ; ten Kate, Herman (CERN)
An investigation is performed on the quench behavior of a conceptual 50-GJ 8-T high-temperature-superconductor-based solenoid. In this design, a 50-kA conductor-on-round-core cable-in-conduit conductor utilizing ReBCO technology is envisioned, operating at 40 K. [...]
2016 - 8 p.
- Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4500608
In : 24th International Conference on Magnet Technology, Seoul, Korea, 18 - 23 Oct 2015, pp.4500608
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3.
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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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4.
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Quench Propagation in Nb$_3$Sn Rutherford Cables for the Hi-Lumi Quadrupole Magnets
/ Fleiter, J (CERN) ; Bordini, B (CERN) ; Ballarino, A (CERN) ; Oberli, L (CERN) ; Izquierdo, S (CERN) ; Bottura, L (CERN)
The quadrupole magnets for the LHC High Luminosity (Hi-Lumi) upgrade will be based on Nb_3Sn Rutherford cables that operate at 1.9 K and experience magnetic fields larger than 12 T. Because of the large stored energy, one of the major issues in the design of these magnets is their protection. [...]
CERN-ACC-2015-0161.-
2015 - 4 p.
- Published in : IEEE Trans. Appl. Supercond. 25 (2015) 4802504
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.4802504
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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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7.
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New, Coupling Loss Induced, Quench Protection System for Superconducting Accelerator Magnets
/ Ravaioli, E (CERN ; Twente U., Enschede) ; Datskov, V I (CERN) ; Giloux, C (CERN) ; Kirby, G (CERN) ; ten Kate, H H J (CERN ; Twente U., Enschede) ; Verweij, A P (CERN)
Email Print Request Permissions Save to Project A new and promising method for the protection of superconducting high-field magnets is developed and tested on the so-called MQXC quadrupole magnet at the CERN magnet test facility. The method relies on a capacitive discharge system inducing, during a few periods, an oscillation of the transport current in the superconducting cable of the coil. [...]
2014
- Published in : IEEE Trans. Appl. Supercond. 24 (2014) 500905
In : 23rd International Conference on Magnet Technology, Boston, MA, USA, 14 - 19 Jul 2013, pp.500905
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8.
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Quench Protection System Optimization for the High Luminosity LHC Nb $_3$Sn Quadrupoles
/ Ravaioli, E (LBL, Berkeley) ; Ambrosio, G (Fermilab) ; Auchmann, B (CERN) ; Ferracin, P (CERN) ; Maciejewski, M (CERN) ; Rodriguez-Mateos, F (CERN) ; Sabbi, GL (LBL, Berkeley) ; Todesco, E (CERN) ; Verweij, A P (CERN)
The upgrade of the large hadron collider to achieve higher luminosity requires the installation of twenty-four 150 mm aperture, 12 T, $Nb_3Sn$ quadrupole magnets close to the two interaction regions at ATLAS and CMS. The protection of these high-field magnets after a quench is particularly challenging due to the high stored energy density, which calls for a fast, effective, and reliable protection system. [...]
FERMILAB-PUB-16-563-TD.-
2017 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4702107
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4702107
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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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