Close V6 to stop circulation. Tower temperature will rise, G1/G2 pressures will fall, Still pressure will rise.

Close V13A or V13B and turn off 3He circulation pump.

Set MC heater to 1 mW.

When Still pressure (P1) rises above 100 mbar, open V3 to equalize pressure between Still and Condenser.

At any point before beginning cooling again, move mu-metal shield to desired position

When Tower temperature ≥ 1.7 K you can begin to cool to base again

Turn off MC heater. Turn on 3He pump. Open V13A or V13B. Close V3.

Begin circulation in standard way by opening V6 to > 12.5% in steps, allowing G1/G2 to settle between steps.

Continue cooling to base.

After tower is cold (<0.2 K) raise mu-metal shield back to standard height before taking measurements.