What's inside IVC
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IVC stands for Inner Vacuum Chamber. It hosts the most important parts of the whole fridge system, ie, the dilution units which contains liquid mixture of 3He and 4He.
The IVC. After taking off the magnet, we can see the shape of the IVC. The shinning cylinder seperates the dilution units inside from the helium bath outside. The thin tail is where the sample resides during measurements. Behind the IVC is the ALCATEL ASM142 leak detector.
Inside the IVC. The cylinder shaped part in the middle is 1K pot. It precools the mixture gas to about 1 K and liquifies it. As a reminder, after the dilution units are cooling down to liquid helium temperature (about 4.2K) by some exchange gas, IVC is pumped vacuum again, which is important to get ultra low temperatures down to 10 mK.