The weak point of cryofree dilution refrigerators is the vibrations generated by the pulse tube cold head. Even if the valve motor is remote, the helium gas expansion in the cold head is generating a wide range of very nasty vibrations for most of the experiments.
The only definitive solution to cut all vibrations is to mechanically decouple completely the cold head and its valve motor from the dilution unit. The big challenge is to maintain the cooling performance of the refrigerator with no physical contact from the cold head first and second stages to the whole stages of the dilution refrigerator down to the mixing chamber.
This unique performance is completed within the Ultra Quiet Technology ™ developed by Cryoconcept.