Gas gap heat switches are generally used to speed up the cool-down process in dilution refrigerators as well as to control thermodynamic cycles in adiabatic demagneti-zation refrigerator.The fundamental principle is by charging or discharging helium gas (³He或⁴He) inside a small gap between two copper fingers, heat transfer can turn on or off between these two copper fingers. Lihan provides a series of standard heat switching products for extreme low temperature refrigerators. Tailor design can also be offered upon user request.

• High switching ratio>1000
• Low adsorbent heating power<20mW
• Minimum ON-state thermal conductance>50mW/K