Physics & Astronomy Faculty and Staff Publications
Invention disclosure to University of New Mexico, 5/2012
In low-temperature research and applications it is often required to reversibly and controllably change the thermal conductance between two parts of an apparatus. Classic examples where this is required include adiabatic heat capacity measurements and the adiabatic demagnetization refrigerator. In this disclosure we describe a solenoid-driven latching mechanical thermal switch. Solenoid actuation eliminates the need for a cryogenic mechanical drivetrain to actuate the switch. Instead, only two wires are required. Latching action is provided by a pole piece including a permanent magnet. The latching action means that the switch is only powered during brief changes of state, from “on” to “off” or vice-versa. This minimizes the heat load to the cryogenic stages.
Boyd, S. T., Jaeckel, F. T., Le, L. N., & Martin, K. W. (2012). Latching Permanent Magnet Electro-Mechanical Heat Switch for Cryogenic Applications. University of New Mexico. https://doi.org/10.25827/P1NA-N038