In this episode Shahriar experiments with a SunPower CryoTel Mini Cryocooler:
https://www.sunpowerinc.com/products/stirling-cryocoolers/cryotel-cryocoolers/ds-2_1
A three-stage turbomolecular vacuum system is used to reach very low pressures of 10E-6 Torr to provide a suitable environment for the cryocooler. Unfortunately, due to the age of this unit, the maximum applied power is limited to 22W. Despite this, reaching temperatures of -210C is possible with no thermal load. A custom heater element is also used to inject thermal energy into the cold tip and measure the available lift from the engine. A new GUI is also developed to control the cryocooler, measure the cold tip temperature, rejection temperature and applied power as a function of time. This allows several cryocooler modes to be explored.
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