At the SpinLab I had access to a 2″ cryostat capable of cooling down to sub 2K, and it was equipped with a 3-axis vector magnet.
With the help of local machinists, I developed a few odd probes compatible with this cryostat as well as with a 1″ PPMS cryostat belonging to a neighbor.
The design principles were fairly straightforward.
Make a CAD render using SolidWorks.
Start with a standard 2″ flange. Machine a hole in the center and attach an SS tube of appropriate length via a custom built mating piece. Add twisted pairs of high guage copper wires. Seal with Stycast. Make a distribution box. Start coding.
In order to determine the phase transition temperatures of samples, the mutual inductance between two planar coils placed on either side of them is logged as a function of temperature.
Measurements with the AC susceptometry probe were carried out using an SR830 Lockin amplifier. This was interfaced with a laptop running Ubuntu by using linux-gpib (I prefer open-source tools ).
The application was developed with PyQt4 and uses PyQtGraph for all its plotting needs.
All source code can be found on its GitHub Repository