A3 Cool-Down Procedure for Closed Cycle Refrigerator
Check He-gas pressure p > 17 bar at compressor unit.
Install water cooling circuit.
After sample mounting check correct regulaion and sample temperature read out with Lakeshore 340; check heater function, also.
Mount vacuum can and start pumping isolation vacuum with separate turbo pump for p < 10-4 mbar.
Start cooling by switching on the main power switch at the compressor unit.