Experiment with second sound in He-4

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Experiment with second sound in He-4

V.Z., Helsinki, 2016

A small unfinished project for measuring second sound in heluim-4. Plan was to study graphene with it.

An old 1K setup was improved. New gas-handling system for it was made (later it was used for other projects).

Fist version of the cell was built and cooled down to 1.5 K. It was a cylindrical volume with resistive heater on one side and thermometers on another.

V1 cell

assembled

top flange with a heater and filling line

another design of the heater

bottom flange, RuO thermeters and filling line

Second version was not finished. Cell with better connections and Nuclepore transmitter/recievers was almost done. It was a hard technical task to make a suspended Nuclepore membrane with capacity readout. Later I heard that putting the membrane directly to the metal plate also works.