The "Refrigeration Systems Section" today operates a helium liquefier, a Sulzer system built in 1977.

It cools heavy hydrogen gas for the large-scale research facility UCN (Ultra Cold Neutrons). The UCN neutron source generates neutrons that have extremely low speeds, so-called ultra-cold neutrons. A 30-liter container filled with 5 kg of hydrogen (deuterium) forms the heart of this system. In order to solidify the hydrogen gas, the gas must have a temperature below minus 255 O C to be cooled. This is only possible through the use of a powerful helium liquefaction system that liquefies large quantities of the noble gas helium, which then serves as a coolant for the hydrogen. The Sulzer condenser from 1977 is out of date and no longer meets today's requirements, either in terms of performance or energy efficiency.

For details see specification PSI-DD93-001.

The "Refrigeration Systems Section" today operates a helium liquefier, a Sulzer system built in 1977.

It cools heavy hydrogen gas for the large-scale research facility UCN (Ultra Cold Neutrons). The UCN neutron source generates neutrons that have extremely low speeds, so-called ultra-cold neutrons. A 30-liter container filled with 5 kg of hydrogen (deuterium) forms the heart of this system. In order to solidify the hydrogen gas, the gas must have a temperature below minus 255 O C to be cooled. This is only possible through the use of a powerful helium liquefaction system that liquefies large quantities of the noble gas helium, which then serves as a coolant for the hydrogen. The Sulzer condenser from 1977 is out of date and no longer meets today's requirements, either in terms of performance or energy efficiency.

For details see specification PSI-DD93-001.