The button has been pushed, and our two dilution fridges from Leiden Cryogenics are cooling down. Today they both reach 3 K and we start the condensation of He3/He4 mixture which is the first phase of the final cooldown to the base temperature of ~7 mK.
You can also here the pulse tubes humming, though from where I sit in the meeting room I almost don’t hear them, just see the fridges through the glass window.
spin and coffee 
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