Thermal behaviour of the 100 mK stage during the shutdown of the ⁴He-JT cooler on 6 August 2009. Vibrational power from the 4 K stage propagated to the dilution stage is measured by the step in the power dissipated by the PID regulating the temperature of the dilution stage (“PID Dilution”, in blue) after the rapid drop of the 4 Kstage. It is equal to 26 nW. The power dissipated by the PID regulating the temperature of the bolometer plate (“PID Plate”, in red) shows the effect of the long (0.5 h) time constant of this control.