A New Capacitance Thermometer with Novel Design for Use at Low Temperatures and High Magnetic Fields

摘要

A capacitance thermometer made of thin layers of Kapton and copper that is insensitive to high magnetic fields is described. This thermometer can be easily fabricated and the final thermometer is a thin rigid tube that can be easily incorporated into the sample space of most high-field cryogenic systems. We have demonstrated that the minimum in capacitance versus temperature of these thermometers can be moved to progressively lower temperatures even below our base temperature of 20 mK by changing the construction parameters of the devices. We present data demonstrating their lack of magnetic field dependence and their specific sensitivity, and we discuss power dissipation in typical operation.