
Not really an expert in cryogenics are you. He3 does boil at 2.7k or so, but you can get down below 1.5k with He4 just by pumping on it. In low pressure liquids evaporate at lower temps. Using the same trick with He3 gets you below 0.3k. So with a simple tweak to their apparatus they could go from 4K to ~ 1K which is a huge reduction in thermal energy. I'd be curious to see how much better they could do at 1K. It may not help much or it may help a lot. Also at 1K Al is likely a superconductor ( Bulk Tc is ~ 1.2K) so if they are using AL in packaging they could have some interesting behavior.