Pressure On mirror Chambers, posted by Manar Amer at ThomX igloo about vacuum 
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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: |
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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: |
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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: |
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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
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Pressure On mirror Chambers Leckage Test, posted by Manar Amer at ThomX igloo about vacuum
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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: |
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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: |
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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
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Pressure On mirror Chambers Plot, posted by Manar Amer at ThomX igloo about vacuum
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A plot showing the descend of the vacuum in the mirror chambers (data to plot it obtained yesterday evening)
The regions where there is a drastic decrease is when the ionic pump was turned on.
Today in the morning the pressure was
- on the left : 1.3*10^-9 mbar
- on the right (sortie X) : 4.9*10^-9 mbar
in the evening the pressure was
- on the left : 1.4*10^-9 mbar
- on the right (sortie X) : 4.7*10^-9 mbar
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Pressure On mirror Chambers Plot, posted by Manar Amer at ThomX igloo about vacuum
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During the weekend 23-24th of October, the lab and ThomX suffered a power breakdown.
All the pumping systems had to restart.
as a consequence, the pressure on Monday 25th morning was 4.3e-9 and 4.6e-9 mbar in the left and right vessels.
this morning, the Tuesday 26th, the pressure is 1.4e-9 and 3e-9 mbar.
now, these pressures are compatible with the opening of the valves!
| Manar Amer wrote: |
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A plot showing the descend of the vacuum in the mirror chambers (data to plot it obtained yesterday evening)
The regions where there is a drastic decrease is when the ionic pump was turned on.
Today in the morning the pressure was
- on the left : 1.3*10^-9 mbar
- on the right (sortie X) : 4.9*10^-9 mbar
in the evening the pressure was
- on the left : 1.4*10^-9 mbar
- on the right (sortie X) : 4.7*10^-9 mbar
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Pressure On mirror Chambers Plot, posted by Manar Amer at ThomX igloo about vacuum
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Pressure is 1.4e-9 and 2.6e-9 mbar this morning.
| Manar Amer wrote: |
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During the weekend 23-24th of October, the lab and ThomX suffered a power breakdown.
All the pumping systems had to restart.
as a consequence, the pressure on Monday 25th morning was 4.3e-9 and 4.6e-9 mbar in the left and right vessels.
this morning, the Tuesday 26th, the pressure is 1.4e-9 and 3e-9 mbar.
now, these pressures are compatible with the opening of the valves!
| Manar Amer wrote: |
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A plot showing the descend of the vacuum in the mirror chambers (data to plot it obtained yesterday evening)
The regions where there is a drastic decrease is when the ionic pump was turned on.
Today in the morning the pressure was
- on the left : 1.3*10^-9 mbar
- on the right (sortie X) : 4.9*10^-9 mbar
in the evening the pressure was
- on the left : 1.4*10^-9 mbar
- on the right (sortie X) : 4.7*10^-9 mbar
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Iris Mounts on Cavity Windows, posted by Manar Amer at ThomX igloo about utilities
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In order to find the Alignment of the ThomX cavity, Yann built mounts that could be placed directly on the windows outside the cavity, where we can place an iris at the center.
The center of the iris on the mount corresponds to the center of the mirror.
4 were made, big one for the injection and 3 small ones for the other windows.
The big one fits, but the small ones don't fit, as the heads of screws exceed the circle boundary.
A change to them will be done so that they will fit where they will be clipped from the side.
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Iris Mounts on Cavity Windows, posted by Manar Amer at ThomX igloo about utilities
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The new iris mounts fixed on the small cavity windows.
Need additional 2 irises.
| Manar Amer wrote: |
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In order to find the Alignment of the ThomX cavity, Yann built mounts that could be placed directly on the windows outside the cavity, where we can place an iris at the center.
The center of the iris on the mount corresponds to the center of the mirror.
4 were made, big one for the injection and 3 small ones for the other windows.
The big one fits, but the small ones don't fit, as the heads of screws exceed the circle boundary.
A change to them will be done so that they will fit where they will be clipped from the side.
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One Five laser moved , posted by Manar Amer at ThomX igloo about lasers and optics
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The One Five laser and its controller have been moved from PLIC to ThomX Iglo.
In preparation to Install the Amplifier from Alphanov |
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Alphanov amplifier chiller instruction manual , posted by Manar Amer at ThomX igloo about utilities
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Adding the instructions manual for the Alphanov Amplifier SMC Chiller
Installation and Maintenance Manual Water Cooled Thermo Con for Rack Mount HECR Series |
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New valve cabling and 30Hz noise PZT, posted by Loïc Amoudry at Optical room about lasers and optics | vacuum
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The Pneumatic valves are still coming back to "close" position.
Now the air bottle is always "open" to keep the valves "open".
The 30Hz noise is still here. We tried to cut off all the air flows. It only decreased the noise intensity but didn't change its shape.
21/11/2019 :
The pneumatic valves are now connected permanently to the university airflow network.
there is a small air leakage but it is not an issue anymore.
the 30Hz noise has been fixed too as it was coming from the extreme position of M1 and M4 (plan mirrors) and due to mechanical instability in this position (motor "outside")
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