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Recondensing Magnet Systems with 4.2K Cryocoolers
Cryomagnetics recondensing superconducting magnet systems pair a 4.2K cryocooler with a small liquid helium buffer and proprietary HTS current leads. The buffer enables safe magnet discharge during a power outage, while the recondensing action delivers zero-loss operation in static mode.
Recondensing superconducting magnet systems use a 4.2K cryocooler to recondense liquid helium boiloff during static (persistent mode) operation. Depending upon the particular system design and the customer's planned use schedule, the 4.2K cryocooler can completely stop liquid helium boiloff and result in a zero loss system.
Recondensing systems are usually designed with a small amount of stored liquid helium. This results in a more compact design as compared to traditional superconducting magnet systems.
In all recondensing superconducting magnet systems, Cryomagnetics proprietary high temperature superconductor current leads are installed to minimize liquid helium usage. Cryomagnetics' high temperature current leads are proven performers and have been used in many superconducting magnet systems over the years.
Always designed with safety in mind, all recondensing systems are designed to ASME code and manufactured in Cryomagnetics' facility under strict quality procedures.
In the event of a power outage or cryocooler failure in a recondensing system, the liquid helium buffer will allow enough time for a safe discharge of the superconducting magnet without quench. This is a major advantage over cryogen-free systems, where the time between loss of cooling power and temperature rise above 4.2K is a matter of minutes, not allowing enough time for the safe discharge of the superconducting magnet.
The recondensing system can be viewed as having the best of both liquid cryogen free and liquid helium based systems — liquid helium costs are minimized, systems can be made smaller, and they have the ability to tolerant power faults without superconducting magnet quenches.