Leakage test done in the afternoon.
The method :
- an atomic mass spectrometer is connected to the mirror chamber and a measurement is taken to see all the atoms and molecules in the chamber
- after a Helium gas is spread around the outside of the chamber
- there is a leak if there is a spike at Helium (4 amu)
Attached is a picture of the spectrometer plot.
Conclusion: No leak in the cavity and the pressure is expected to decrease in the coming days
The pressure now is:
- on the left : 1.6*10^-9 mbar
- on the right (sortie X) : 1.4*10^-8 mbar
**Note: there is an increase in the pressure after doing the measurement, which is expected from the spectrometer bumping ions to do the measurement.
| Manar Amer wrote: |
|
At 9h30 in the morning, the pressure on the mirror chambers is:
- on the left : 1.6*10^-9 mbar
- on the right (sortie X) : 6.5*10^-9 mbar
it appears to have decreased significantly compared to the previous deccend !!!!!!
| Manar Amer wrote: |
|
At 10h in the morning, the pressure on the mirror chambers is:
- on the left : 1.9*10^-9 mbar
- on the right (sortie X) : 1.0*10^-8 mbar
Bruno mentions that the pressure on the left is descending too slow, a leakage check to be done on Tomorrow by the vacuum branch.
| Manar Amer wrote: |
|
At 15h30 in the afternoon, the pressure on the mirror chambers is:
- on the left : 2.0*10^-9 mbar
- on the right (sortie X) : 1.4*10^-8 mbar
the pressure decreased by 0.2 in ~ 5 hours for right , but increased by 0.1 for left
not an accurate reading for the change over time
will need to get the pressure vs time graph from the control room.
| Manar Amer wrote: |
|
At 10h45 in the morning, the pressure on the mirror chambers is:
- on the left : 1.9*10^-9 mbar
- on the right (sortie X) : 1.6*10^-8 mbar
|
|
|
|
|