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Global cryogenic Paschen test of the JT-60SA magnet system.

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Title: Global cryogenic Paschen test of the JT-60SA magnet system.
Authors: Wanner, M.1 (AUTHOR) manfred.wanner@ext.f4e.europa.eu, Di Pietro, E.1 (AUTHOR), Barabaschi, P.2 (AUTHOR)
Source: Fusion Engineering & Design. Oct2023, Vol. 195, pN.PAG-N.PAG. 1p.
Subjects: Superconducting magnets, Thermal stresses, Electric insulators & insulation, Magnets, Electromagnetic waves, High voltages, Cooldown
Abstract: • Ambient temperature Paschen tests of components during assembly are standard test methods. • Global Paschen tests of a superconducting magnet system were executed so far only at ambient temperature. • A cryogenic global Paschen test of a full magnet system allows to validate the quality of the electrical insulation after having passed the thermal stresses during the cooldown. • A cryogenic global Paschen test can be safely executed at a temperature of about 90 K and usig argon as test gas. Superconducting fusion magnets feature large inductances, and operate at high currents and at cryogenic temperatures. In case of a quench, the stored electromagnetic energy need to be immediately discharged, thereby inducing high voltages. High quality electrical insulation withstanding cryogenic temperatures is therefore essential for the safe operation of the magnet system. Local and integral Paschen tests at ambient temperature have become a standard to validate the electrical insulation of electromagnetic components of fusion devices. In order to mitigate the risk from a degradation of the electric insulation during cool-down, a global Paschen test of the complete magnet system at cryogenic temperatures is suggested. This paper focuses on the specific design of JT-60SA fusion device, analyses the boundary conditions for a cryogenic global Paschen test, and demonstrates its feasibility at limited risk during a future cooldown. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Ambient temperature Paschen tests of components during assembly are standard test methods. • Global Paschen tests of a superconducting magnet system were executed so far only at ambient temperature. • A cryogenic global Paschen test of a full magnet system allows to validate the quality of the electrical insulation after having passed the thermal stresses during the cooldown. • A cryogenic global Paschen test can be safely executed at a temperature of about 90 K and usig argon as test gas. Superconducting fusion magnets feature large inductances, and operate at high currents and at cryogenic temperatures. In case of a quench, the stored electromagnetic energy need to be immediately discharged, thereby inducing high voltages. High quality electrical insulation withstanding cryogenic temperatures is therefore essential for the safe operation of the magnet system. Local and integral Paschen tests at ambient temperature have become a standard to validate the electrical insulation of electromagnetic components of fusion devices. In order to mitigate the risk from a degradation of the electric insulation during cool-down, a global Paschen test of the complete magnet system at cryogenic temperatures is suggested. This paper focuses on the specific design of JT-60SA fusion device, analyses the boundary conditions for a cryogenic global Paschen test, and demonstrates its feasibility at limited risk during a future cooldown. [ABSTRACT FROM AUTHOR]
ISSN:09203796
DOI:10.1016/j.fusengdes.2023.113959