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Superconducting magnets require direct or indirect cryogenic cooling in order to provide efficient heat removal and thermal stability. Direct cooling using cable-in-conduit conductors with an internal forced-flow of supercritical helium at 4.5 K is a common method for tokamak magnets. Study of heat transfer and helium flow in such magnets is crucial for addressing operational domain and quench protection. Therefore, thermal hydraulic properties of cables and magnet behavior during quench phenomena are characterized, notably for dedicated tools development. Indirect cooling by conduction using a thermal link for coupling superconducting magnet with cryocooler is also a method of interest. Novel devices for efficient thermal link like pulsating heat pipe at cryogenic temperature are consequently investigated.
For details, contact Stéphane Sanfilippo