What would it take to build a cryogenic cooler?

[Shingoshi]

Yeah, I was just blowing a bunch of hot air before. Maybe this will cool things off!

1.) The hot end of the vortex tube MUST be completely sealed.
Doing that allows all of the working gas to produce cold.
2.) The hot end MUST dump all of it's heat into a heatpipe.
The heatpipe MUST be a thermosiphon.

A thermosiphon requires no mechanical energy to dissipate heat. The fluid of the thermosiphon needs to be extremely volatile. A mixture of acetone and ethanol would work just fine for this. As long as you can dump the heat faster than it's generated, the vortex tube will function properly. Producing nothing but cold gas.

Shingoshi

Documentation:
AN INVESTIGATION OF THE EFFECT OF THE HOT END PLUGS ON THE ....
Refrigeration Patent
Experimental Study the Ranque-Hilsch Vortex Tube
Dual Vortex Tube