The Advanced Adiabatic Demagnetization Refrigerator is a multistage Adiabatic Demagnetization Refrigerator (ADR). This figure shows a schematic view of one example of an advanced ADR. The advanced ADR shown is a 3-stage ADR. Each of the 3 stages is labelled with a temperature or temperature range which it might have in a real advanced ADR. Each salt pill is centered within its own magnet coil.
At the far left end is the object that the ADR is supposed to cool. It's labelled "the detector stage" because we expect that the advanced ADR will mostly be used to cool detectors, that is, sensors, designed by astronomers here at Goddard. The detector stage is connected directly to the cold end salt pill. The pill is labelled with a temperature .05 Kelvin. The cold end salt pill is labelled "Continuous stage".
The low end salt pill is connected through a heat switch and a Kevlar suspension to the middle salt pill. The middle salt pill temperature varies from .045 Kelvin to 1 Kelvin. The middle salt pill is connected through a heat switch and a Kevlar suspension to the hot end salt pill. The hot end salt pill temperature varies from .9 Kelvin to 6 Kelvin. The hot end salt pill is connected through a heat switch to a mechanical cryocooler at 6 Kelvin.
The schematic shows a ferromagnetic shield around the middle and hot end salt pills.
Return to Advanced ADR schematic diagram.