Note: at the restart of WE tower (11d pumping) we note that the residual pressure of air (N2+O2) is higher than expected.
WE air pressure (lower part) = 2.5E-8 mbar(~ 3 x expected value)

_ an overall leak test has been repeated on monday 19/2 (already done earlier), without finding leaks in the vacuum enclosure.
_ a check of IVC performances has been done too, without finding anomalies.

The WE air level will be kept monitored, possibly coming from inner materials and then decreasing

Some recordings:
RGA 'lower part' = air at ~ 50%
RGA 'upper part' = water prevalent
total pressure 'upper part' = 1E-6 mbar
total pressure 'lower part' = 5E-8 mbar
IVC check (He injected upper part = 3E-6 mbar.l/s, pumping UP ~ 1000 l/s [LP ~ 300 l/s], He detected on lower part = 5E-9 mbar.l/s)