Jean-Noel Cayla installed several days ago a Eaton 9PX 11kVA UPS inside the Igloo, outside of the ThomX bunker
and I asked him to place only 1 UPS plug on the wall close to the FP-cavity to supply only the NKT/OneFive oscillator and the Smaract laser cavity motors.

I checked that if I plug a device on this UPS plug, I'm able to follow the power, used by the device, on the UPS monitoring screen.

thus, this morning, I plan to switch off the laser oscillator and move its power cable from a standard plug to the UPS plug and test if we are able to find back the previous performances of the locking.

the present Smaract motor positions are : CH0 => +140µm / CH2 => -177.8µm
as unpowering the motor will put the read position at 0µm, I first go back to 0µm for both channel.
I will put them back at their original values after I plug the motors back to UPS.

finally I installed the OneFive laser, the Smaract motors of the laser and the Arduino Peltier controller of the laser on the UPS plug.
the power "seen" by the UPS is 0W, perharps because the used power is below 100W.
the UPS says it can last 385mn (> 6h) in case of power shut down.

I had to do 10mm step at 10mm/s speed on CH0 of the Smaract motors to get back the laser modelock.
then, I put back the CH0 position at +140µm and the CH2 position at -177.8µm on the Smaract motor.

the present level measured by the laser amplifier is 3.05mW after the power ON of the laser @ CH0=0µm
the level measured by the laser amplifier is 3.012mW after the power ON of the laser @ CH0=+140µm

the level measured by the laser amplifier is 3.125mW after the power ON of the laser @ CH0=+140µm when we switch ON the preamplifier
then, we are able to check the laser repetition rate @ 33.383MHz measured by the amplifier software.

I was able to lock back the FP-cavity.

at one moment, during the alignment optmization process of the infection mirrors of the FP-cavity, I had a huge misalignment moving Ma-Y motor.
I had to realign a lot this motor to get back to the standard power inside the FP-cavity.

=> maybe one needs to make some "walking" procedure on the alignment mirrors to get the best alignment => to be done

presently, the lock @32% of amp ratio produces 50kW inside the FP-cavity.
CH0 Smaract motor = 107µm
CH2 Smaract motor = -113µm
​

since around 2 weeks, the airflow above the optical table housing has a power breakdown when one tries to switch it on.

the power breaker is in the electrical bay, on the left of the south entrance of ThomX.
the name of the power breaker switch related to the airflow is "TABLEAU ANNEAU 4".

today, with Kevin, we switched off all the airflow boxes 1 by 1 to find the defective ariflow box :
when we are face to the optical table housing panels, it is the third one from the left on the rear side.
this airflow box has been switched off (all the airflow boxes have a individual switch).
now, the airflow can be switched on again without any issue.

one needs to order 1 replacement box + some spare ones => mail to be sent to the AirC2 company.

If one needs to work with 3rd stage on the laser amplifier, one needs to make the safety patrol inspection before closing the bunker.

for that, it is mandatory to switch 2 keys on the "key board" in the control room, just before or just after the safety patrol :
- the THOMX key to 1
- the "EXPLOITATION LASERFP" key to 1

for the safety patrol, one has to push the "blinking white" buttons on the walls of the bunker, in the order from 1 to 6, and finish by the south entrance door button.
message " ronde en cours" is shouted during the process.
at the end of the safety patrol, an alarm is triggered for 30sec approx. and then stop.
now, the special keys located at the south entrance door are green and one has to take them (at least 2) to enter the bunker without breaking the safety patrol.

after finishing the controlled intervention, you just have to exit the bunker with the 2 keys and place them back in their location

then the controlled access (colored yellow) will turn to "access interdit" (red colored)

to terminate the closure of the bunker, you just have to turn the two key indicated in the previous image back to their original position.

Adding the instructions manual for the Alphanov Amplifier SMC Chiller

Installation and Maintenance Manual Water Cooled Thermo Con for Rack Mount HECR Series

this afternoon, because of the test on the electron beam drive in the ring in the next days,
I removed the scope and the desktop computer (but not the display) installed close to the ThomX optical cavity.

they have been stored in the "Viktor" ThomX optical room.

- this morning with Aurélien, we filled the water tank of the chiller and we opened the water valves (last pipes on water arrival/departure panel).

there is no leakage on the external water circuit but there is a small one on one of the Swagelock adapters of the water circuit connected to the Alphanov Amplifier.
we will add some Teflon to remove the leakage.

- the chiller alarm can be connected to the interlock detection of the Alphanov amplifier (I2 connector).
we will have a closer look at the different connectors next time, as the Alphanov manual is not very clear on how to connect them together.

- this morning the chiller leakage has been fixed by adding some Teflon on the faulty Swagelock adapter.
a long leakage test has to be done to be sure there is no leakage at all => can be done on Friday during our tests.

- here is a picture of the 2 Alphanov amplifier controller interlocks.
I2 has to be connected to the Sub-D15 connector of the SMC HECR008 chiller

This morning, I started the chiller and opened the valves on the external water circuit => no water leakage during the morning.

now, the chiller will stay ON all the time => we will check the installation at the end of the afternoon.

This afternoon with Yann:
- we changed the shutter base plate position to center the beam axis with the mirrors center => to be checked with the amplifier beam
- on the L-shaped arm, the axis along the cavity beam has been centered. it should be never moved !!! (it corresponds to the less accessible knob).
Yann confirmed the 2 other translation axis of the L-shaped arm follow the back plate position.
These 2 axis have been positioned to put the L-shape plate completely of the beam path.
- the panel of the housing which was shifted has been fixed. now, it is properly aligned.

This afternoon, an electrical operation will be done in ThomX, impacting possibly the casemate power supplies.

Then we shut down all the equipment.

this afternoon with Viktor, we redid all the power supplies connexions.

4x cables are now connected to the wall sockets.
- 1x extension cable for the mini-rack multi-sockets cable.
- 3x triple-sockets long cables (3.5kW each).

all other cables have been removed and replaced.

we brought the other half-rack next to the first one.

The One Five laser and its controller have been moved from PLIC to ThomX Iglo.

In preparation to Install the Amplifier from Alphanov

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.

The new iris mounts fixed on the small cavity windows.

Need additional 2 irises.

as the vacuum level was good enough, I asked Eric Mistretta to open the 2 valves of the FP cavity.

He said the vacuum group made several tests during the last days, opening and closing these valves!
I asked him to not open and close them as it could release some dust on the mirrors.

Eric opened the valves in "local mode", using directly the valves controller (see attached image).
He was unsure of what could happen if he switches to the "remote mode"... the valves could be commanded to close again.
so, for the moment, one stays in "local mode".

after opening the valves, the vacuum level started to decrease inside FP-cavity :
9.7e-10 mbar for the left vessel
1.7e-9 mbar for the right vessel

On Friday the 5th of November, ThomX suffered again from a power breakdown.

all the pumping systems had to be restarted.
this produced a vacuum level increase and the FP-cavity valves shut off for security reasons.

Today the vacuum level is good enough and the 2 FP-cavity valves have been reopened by Eric Mistretta.

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

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!

Pressure is 1.4e-9 and 2.6e-9 mbar this morning.

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

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. 

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.

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 !!!!!!

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.

The pressure for the mirror vacuum chambers needs to be ~ few 10^-9 mbar for the valves to be open to the electron ring (the rest of the vacuumed ThomX)

Reminding: the opening of the valves is the responsibility of the vacuum group only.

• When connecting the Ethernet cable from the hub to the computer, it must be connected to the correct one (shown in green arrow in photo), it is not the usual internet
• the Motor controllers are under the Cavity table.
• The last image shows the positions of each mirror (To be checked if they are actual readings)

This afternoon with Manar, we finished connecting FP-cavity mirrors motors and alignment mirrors motors to their 3 ISP controllers.
We also added an Ethernet hub on top of these controllers to merge the controller's connections to the computer.
We added some cable extensions to the alignment mirrors motors.

We tested the connection and the controlling software made by Didier.
We used the supervisor software as one needs the trick to bypass the Didier safety procedure embedded in its user's software (Chassis12.exe and Chassis3.exe)
We were able to move the motors (tested only upon the 4 motors of the alignment mirrors) but sometimes it seems we have some connection bugs which freeze the access to the ISP controllers.

After some hours of pumping, the vacuum level decreased properly on the left vessel (input mirror) but it seems to decrease slowly on the right vessel (end mirrors).
In consequence, Frederic has been able to start the ionic pumping only on the left vessel (+ Turbo). The right vessel is still pumped by the Turbo pump.
at 5 pm, the pressure was 1.4e-8 mbar for the left vessel and 1.9e-6 mbar for the right vessel.
Depending on the pressure on Monday, Frederic could start the ionic pumping for the right vessel too.

after the WE, the right vessel vacuum level is 1.7e-7 mbar (primary + turbo pumps)

and the left vessel vacuum level is 1.8e-9 mbar (primary + turbo + ionic pumps)

I will ask Frederic to start the right vessel ionic pump.

Now, both vessels are pumped by an ionic pump (both Turbo pumping entrances have been closed).
the primary pump has been removed from the left vessel.
we kept the primary pumping on the right part "in case of".

Now, the pressure on the right vessel is 2.1e-8 mbar.
the pressure on the left vessel is stable around 1.9e-9 mbar.

• The electron ring has been vacuum inside it, but the valves connecting it to the two mirror chambers are closed. Before commencing to do measurements on the cavity, we must place the mirrors under the proper vacuum and open the valves connecting them to the electron ring.

• The vacuum system is consistent of three levels; Normal (max ~10^-3 mbar), turbo (max ~ 10^-7 mbar) and ionization.
• With the help of  Frédéric LETELLIER and Mercier Bruno from the vacuum department in the morning.
  • Installation of the first level vacuum (normal pump)
  • Installation of the second level vacuum (turbo pump)
    • can reach up to 1350 Hz = 81 000 rotation per min (how fast it reaches max rotation depends on how good the first level pump was done)
  • Installation of the connections to the gauge meter, there are two gauges, one for first level and one for second.
• All turned on !!

• Both are on and can be monitored from ThomX control room
  • The attached photo from the control room shows how we will be able to get a graph of vacuum over time.
    • (we were able to reach approximately for Volume 11 and Volume 12 respectively 4.1*10^-6 and ~8*10^-7)
      • to explain Volume 11 and volume 12 (look at Location of ThomX vacuum valves photo)

• A photo of the control module placed outside the bunker to control the optical cavity vacuum is attached
• This afternoon the third system will be installed and turned on

*** Note after vacuum is set there will be three permeant cables inside the cavity box for monitoring.

the ionic pumps have been also connected this morning but not powered on, yet.
the vacuum group is waiting for a vacuum level below 10**-6 to power them on.

it should be the case this afternoon.

about permanent cables on the optical table for the vacuum system, there are 2 for the gauges and 1 for the ionic pump for each vessel, then 6 in total.

This morning with Manar, we started to clean the floor around the cavity, the outside part of the panels of the housing, and the optical table.
we will continue this afternoon and, in the end, we will make some dust measurements.
do we know who in ThomX is in charge of the cleanness of the casemate (bringing overshoes, sticky floor, cleaning company for the floor,...)?

the motors controller mini-rack has been installed under the optical table.
but it is still not connected to motors or computer.

we saw a chiller beside the optical table... is it the laser amplifier chiller ?

there is also the hexapod controller which is presently close to the wall.
do you remember where is the final place of this controller?

the two vessels of the FP-cavity are presently at room pressure with nitrogen inside.
it has to be put under vacuum (~ 10**-8) before opening the 2 valves which are separating the vessels from the electron ring.
we can't make any Finesse measurement until the vacuum is made and the valves are open.
we discussed with Bruno about that, and he is aware of the situation. He said he will try to pump the vessels as soon as possible
in order to be able to inject a laser on the next opening, next week.

This afternoon, we continued to clean the housing with Manar and Daniele.
we did a dust measurement after cleaning with the two ceil doors opened and the dust meter in the middle of the table, and it counted ZERO!
it doesn't mean the housing is perfectly clean but it is clean enough to pay attention now to cleanness.

Then from today, we have to wear overshoes at the entrance of the ThomX casemate and wear clean coats below the airflow (we installed the coats inside the FP-cavity airlock).

for cabling motor controllers, we discussed with Aurélien about the Alphanov amplifier position on the optical table.
we don't have the last schemes... so, Aurélien sent an email to Guillaume Machinet and Yann to get them.
normally we could let the computer inside the casemate close to the optical table while the electron beam is not filled inside the ring.
as it is dumped on the opposite side of the casemate, the computer position should be radiation safe for now.

One half-height rack, close to the optical table, has few network devices BUT takes almost all the rack place!
we could easily fit the hexapod controller in this rack with "logical" cabling.

On the 27th of May, the Airflow has been dismounted from the optical room to be mounted around the optical cavity by the AirC2 company.

here is email from Yann :

Le flux est rentré dans la casemate.
Lundi la société AirC2 revient pour installer les rideaux.
Petits couacs :
- 2 plaques de faux plancher à découper
- le saut de loup à été déplacé (à voir si c'est OK pour tout le monde)
- filet de toit à retendre
- poutres du toit à remettre
- main courante du faux plancher à retirer
- attention au coin du flux au niveau du saut de loup (à baliser et protéger)

The AC plug and the power cord of the airflow were quite hot because they have been dimensioned for 16A current and the total current is above.
AirC2 company should replace them with 32A equipment (6mm2 power cord + 32A Hypra AC plug) in the next days.