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Instrumentation

Thermal Anchoring

To reach a low final temperature and a short cooling time, the thermal conductivity from the microscope to the cryogen has to be maximized, and the thermal load from room temperature has to be minimized. Heat transfer through the electrical connections and pressed contacts has to be considered as well as thermal radiation. The photo shows the microscope, its thermal anchoring and the small chamber with electrical vacuum feedthroughs, which are necessary to operate the microscope.

The microscope body is screwed to a copper cylinder with a cylindrical ground plate, which in turn is screwed to the bottom of the liquid helium tank. A second copper plate is screwed to the bottom of the liquid nitrogen radiation shield. The copper cylinder serves as a thermal anchoring for the electrical wires. All electrical connections between room temperature and the microscope are made of manganese wires because of their reduced thermal conductivity compared to copper. A temperature of 5.2 K is routinely achieved with our design.

Read more about the construction of the microscope body.

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