4-5kW to extract how many picowatts of heat from the system? You can't quote a number for the cryocooler without knowing how much heat is being injected into t

4-5kW to extract how many picowatts of heat from the system? You can't quote a number for the cryocooler without knowing how much heat is being injected into the thing it needs to keep below 4.2K.