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Characterisation of...
Characterisation of SiC Varistor Quench Protection Operating at 4 Kelvin for Use With Superconducting Magnets
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- Galvin, Tom (author)
- M&I Mat Ltd, Manchester M32 0ZD, England.
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- Kirby, Glyn (author)
- CERN, CH-1211 Geneva, Switzerland.
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- Pepitone, Kevin, Dr, 1988- (author)
- Uppsala universitet,FREIA
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- Coll, Dominic (author)
- M&I Mat Ltd, Manchester M32 0ZD, England.
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- Twin, Andrew (author)
- Oxford Instruments, Abingdon OX13 5QX, England.
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- Warren, David (author)
- Oxford Instruments, Abingdon OX13 5QX, England.
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- Ball, Steven (author)
- Oxford Instruments, Abingdon OX13 5QX, England.
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M&I Mat Ltd, Manchester M32 0ZD, England CERN, CH-1211 Geneva, Switzerland. (creator_code:org_t)
- IEEE, 2023
- 2023
- English.
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In: IEEE transactions on applied superconductivity (Print). - : IEEE. - 1051-8223 .- 1558-2515. ; 33:5
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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. Varistors are semiconductors and therefore exhibit a temperature-dependent voltage-current relationship, so characterising their behaviour at low temperatures is important to predict their energy extraction behaviour. In this paper we present characterisation data of SiC varistor devices from 4-300 K: voltage-current characteristics, thermal conductivity, specific heat capacity, thermal expansion, and flexural strength. These varistors are a candidate for protection at 1.9 K of the MCBY magnets, currently being built at Uppsala University for CERN.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- Varistors
- Superconducting magnets
- Temperature measurement
- Temperature
- Silicon carbide
- Temperature dependence
- Cryogenics
- Superconductor
- Quench Protection
- Energy Extraction
- Varistor
Publication and Content Type
- ref (subject category)
- art (subject category)
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