What is the maximum amount of power a resistance thermometer at 4K could dissipate, and still be accurate to 1uK?

Let's suppose I wanted to measure the temperature of a device immersed in liquid helium at approximately 4K. How could I accomplish this to an accuracy of 1uK?

Explain to me how a lock in amplifier works.

What you described is not related to super conductors.

That's true of a non-superconducting transformer. But what about a superconducting transformer?

Can a superconducting transformer operate at DC?

If I wanted to load a current into a super conducting loop, how could I use a heat switch to accomplish that?

Explain to me how a superconducting heat switch works.

Let's suppose the dewer holds 1L of liquid helium.

How much liquid helium would that approach save, as a % compared to filling it with just liquid helium?

GPT nailed this answer perfectly. Which isn't surprising as there's gotta be _so_ many examples of people describing this industry standard solution.

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Suppose I wanted to fill a warm, room temperature, dewer with liquid helium. How could I reduce the amount of liquid helium needed to cool the dewer down to 4k?

This is actually a real problem we faced at a company I used to work at. GPT sorry of kinda hits on the right solution. But only because it has a bunch of statistics from people saying "cancel out torque"

The right solution is to direct the boiled off helium into two nozzles in opposite directions to cancel our the forces.

#[2]

How could I cancel out the torque induced by helium boil off?

Suppose I had a liquid helium dewer on a device that was extremely sensitive to forces. Would the boiling off of the helium pose a problem?

What material would you put in between the vaccume space of a dewer to prevent thermal radiation?

That makes more sense.

Explain to me how a dewer is constructed.

Are you sure that is correct?

Why else would a superconducting device use a vacuum chamber?

How does a vacuum chamber prevent magnetic interference?