Quench Heater Technology for HL-LHC Superconducting Accelerator Magnets

Quench heaters for the active protection of superconducting magnets are large flexible circuits that are produced in a photolithographic process. The HL-LHC quench heater base material, the circuit production process and the qualification tests are described. For potential future use as interlayer q...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2024-08, Vol.34 (5), p.1-5
Main Authors: Scheuerlein, Christian, De Oliveira, Rui, Piccin, Roland, Meuter, Florian, Glogiewicz, Fabian, Katzer, Balduin, Thetter, Tobias
Format: Article
Language:English
Subjects:
Circuit protection
Coatings
Dielectric strength
Diffusion barriers
Diffusion coating
Electrical resistance measurement
Electrolytic Cu deposition
flexible circuit
Heating systems
High temperature
Interlayers
Photolithography
polyimide
quench heater
quench protection
Resistance
Resistance heating
RRR
Steel
Superconducting magnets
Superconductivity
Temperature measurement
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Description
Summary:Quench heaters for the active protection of superconducting magnets are large flexible circuits that are produced in a photolithographic process. The HL-LHC quench heater base material, the circuit production process and the qualification tests are described. For potential future use as interlayer quench heater, a Cu coating with a Ta diffusion barrier has been developed that can resist the high temperatures needed for coil reaction. The application of a coverlay enables dielectric tests at voltages that approach the specified breakdown strength of the polyimide insulation. Potential further improvements of heater performance and robustness are discussed.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2023.3346837