Pulse Tube Cryocooler - Part 1, linear-motor based + theory of regenerative cooling - Hyperspace Pirate

Pulse Tube Cryocooler - Part 2 (-75C, extensive characterization) - Hyperspace Pirate

Pulse Tube Cryocooler (Part 3) - Hyperspace Pirate

Pulse Tube Cryocooler (Part 4) - Valve Controlled (Gifford-McMahon cycle) - Hyperspace Pirate