Reports of 44380
AdV-DAQ (Environmental Monitoring)
rderosa, fiori, paoletti - 13:11 Tuesday 14 July 2020 (49070) Print this report
Switch off of environmental electronics in DAQR

This morning, from about 7:40 to 8:10 UTC we performed a measurement of the magnetic noise in the rack hosting the environmental monitoring electronics in DAQR, in different conditions:

- at about 7:42 UTC the probe was placed in the selected position, between the ENV-NI and ENV-BS slow monitor modules;

-at 7:51 UTC all the envmon electronics in the rack was switched off;

-at 8:00 the two PCB amplifiers were switched on;

-at 8:02 the Nexus amplifier was switched on;

-at 8:04 the slow monitoring modules far from the magnetic probes (ENV-IB,PR,DT,SR,WI) were switched on

-at 8:06 the remaining modules were switched on.

In figure 1 the evolution of the measurement is shown, while in figure 2 the spectra of the noise measured in different period of the test are reported: magenta=All OFF, cyan=PCB and Nexus ON, green=Far modules ON, blue=All ON.

It is evident that the measurement is mainly dependent from the distance between the probes and the source, indeed about a factor 10 of noise increase is observed between the two last conditions.

Images attached to this report
IT infrastructure (Data Storage)
salconi - 10:17 Tuesday 14 July 2020 (49069) Print this report
st01, st02 and st11 software update
Due perform a SO update (RedHat package fix), the server machines:

ST01, ST02 and ST11 need to be rebooted.

Following storage areas can be unavailable for few minutes:

tcs
squeezing
omicron
ligoldr
seismon
wdf
geo

50Hz archive
trenddata archive

all rawdata circular buffers
AdV-PAY (SR Payload)
Ciardelli, Majorana, Menzione, Perciballi - 18:44 Monday 13 July 2020 (49068) Print this report
SR ready for the integration with the seismic suspension.
The SR payload is under the HYMO lift ready to be inserted in the vacuum chamber and suspended.
We do it tomorrow morning.
Images attached to this report
Vacuum (General_status)
Menzione, Vacuum - 12:29 Monday 13 July 2020 (49067) Print this report
Comment to SR tower cleaning and evacuation (49055)

The mentioned o-ring has been replaced, the SR tower bottom access flange is now open.

 

Vacuum (General_status)
Vacuum - 16:33 Saturday 11 July 2020 (49066) Print this report
Comment to SR tower cleaning and evacuation (49055)

Venting of SR tower has been started.

He-test main results:

  • the newly added viewports #U59 , #H54 (logentry 49041) have passed, LR<5E-8 mbar.l/s
  • the 2nd virola viton o-ring is to be replaced
Detector Characterisation (Broadband noise)
mwas - 11:59 Friday 10 July 2020 (49064) Print this report
Scattered light bump projection for O4

I have fitted by eye with Gaussians the scattered light bumps for which we have some understanding based logbook 48854 and logbook 47928,  and the taken into account the expected change in scattered light coupling between O3 and O4 due to SR installation. I haven't included the known bumps of scattered light from squeezing. As these should disappear with the installation of SQB1 and having the double Faraday isolator suspended under vacuum.

Figure 1 shows as the dashed cyan curve the total of the scattered light bumps modeled. This is implemented in GWINC, and the measured parameters in O3 are in the snippet of code below.

In total for O4 these bumps would cause a 4 Mpc loss of sensitivity (from 108 to 104 Mpc). With 3 Mpc lost due to the 33Hz bump from SNEB, and roughly 1Mpc lost due to each SWEB (125Hz), SR-DET link (180Hz) and SIB1 (101Hz and 157Hz) (remember Mpc add in quadrature).

The loss is not that big, because most of these bumps are relatively narrow, but they might be more broad band scattered light structures that are harder to see but have a bigger effect on the data.

% scattered light from SWEB
bump125Hz = SWEB.*sqrt(1.13^2-0.9^2)*1e-23.*exp( -(f-125).^2/4^2);

% scatter light from SR-DET link
bump180Hz = SDB1.*sqrt(1.8^2-0.9^2)*1e-23.*exp( -(f-180).^2/1.7^2);

% scatter light from SIB1 vacuum chamber
bump101Hz = SIB1.*sqrt(2.7^2-0.9^2)*1e-23.*exp( -(f-101).^2/1^2);
bump157Hz = SIB1.*sqrt(1.6^2-0.9^2)*1e-23.*exp( -(f-157.4).^2/2^2);

% scatter light from SNEB vacuum chamber
bump15Hz = SNEB.*2e-22.*exp( -(f-15).^2/5^2);
bump33Hz = SNEB.*2.2e-23.*exp( -(f-33).^2/5^2);

 

Images attached to this report
Vacuum (Beam splitter)
Francescon, Gherardini, Macchia, Pasqualetti, Sentenac - 0:04 Friday 10 July 2020 (49044) Print this report
Comment to follow-up of the IVC repair activity on BS tower (49007)

After the recent repair/mitigation attempt on the BS IVC, the BS tower has been put under vacuum and then tested in order to re-estimate the residual ‘leaking defect’ through the IVC.

The test has been done by injecting the He gas inside the tower upper part (via Vc2, CL 6.6E-7 nom.) and measuring the He flux reaching the lower part (and then the upper too) by the usual Leak Detector.

The IVC ‘leaking' defect is estimated around  ≈ 3 x the expected figure (while before the intervention the estimate was > 10 x ).

A significant reduction has been achieved.

 

Here some recordings:

Before the repair: LD_old lower =7.2E-8 A.U.

After the repair run I: LD_old lower =1.1E-8 A.U.

After the repair run II: LD_new lower =1.4E-8 A.U.

test pressure 1E-5 / 1E-6 mbar; 400/547Hz

PR tower: LD_old lower = 0.5E-8 A.U. (for comparison)

Additional note: we have rechecked the leak tightness of the tower upper rings (opened/closed for the intervention). No leaks found above > 5E-8 mbar.l/s.

 

In conclusion: the defect has been localized and a significant mitigation has been accomplished. We consider the intervention completed for the moment.

Also, we shall prepare for a more reliable a repair,  to be implemented when needed or convenient for the general plan (normally a new suitable seal replacing the present one found leaking, suitably shaped. It will require to raise the IVC by some mm during the installation).

AdV-INF (Virgo Reference System Geometry)
a.paoli, l.paoli, c.fabozzi - 19:01 Thursday 09 July 2020 (49063) Print this report
Tracking of SQB1 position and other auxiliary points in DET Lab

Today we tracked the position of the SQB1 microtower (11.3000, 3.3100) on the floor of DET Lab (Fig. 1 and 2) and the other auxiliary points neded for the next installation of the clean air structure (Fig. 3, 4 and 5).

Images attached to this report
AdV-DAQ (Electronics Infrastructure)
Letendre, Pacaud, Masserot, Rolland - 18:24 Thursday 09 July 2020 (49062) Print this report
DAQ installation for PSL - EERoom
Two DaqBoxes have been installed in the EE-room for PSL:

In rack 2:
DaqBox 21 - mADC 18 | mADC 37 | mADC 83 | mADC 02
DaqBox 56 - xx | mDAC 54 | xx | mFastDAC 13

Images attached to this report
AdV-DAQ (Electronics Infrastructure)
Letendre, Pacaud, Masserot, Rolland - 18:17 Thursday 09 July 2020 (49061) Print this report
DAQ installation for ALS - End buildings
A DaqBox for ALS has been installed at each End building rack 7.

North End: DaqBox 66 - mADC 75 | mADC 73 | mDAC 62 | mFastDAC 12
West End: DaqBox 50 - mADC 88 | mADC 80 | mDAC 2 | mFastDAC 11

ALS DaqBox timing is chained with another DaqBox. This has to be changed in the future by connecting ALS DaqBox timing directly to the timing distribution box.
Images attached to this report
AdV-PAY (SR Payload)
berni, gherardini - 15:12 Thursday 09 July 2020 (49060) Print this report
Comment to SR Payload assembly completed (49058)

With the payload completely assembled we have finalized the cabling of the new devices: Ring Heater and its temperature probe.
From the "eletrical point of view" it has been all checked and tested.

Infrastructures (Electrical installation)
M. D'Andrea + External firm of electricians - 13:07 Thursday 09 July 2020 (49059) Print this report
Lighting system renovation in the Central Building attic
The implementation of the lighting system was requested in order to increase safety (visibility) during the attic maintenance and cleaning of the Central Building (CB), as well as facilitating the maintenance of the CB UTA filter boxes (replacement of HEPA filters).
During this intervention, the electric power extention cord of the attic electric windlass was replaced (Safety reason) too, with the new electric line dedicated.
Images attached to this report
AdV-PAY (SR Payload)
E Majorana, L Naticchioni, M Perciballi - 12:07 Thursday 09 July 2020 (49058) Print this report
SR Payload assembly completed
The payload assembly was completed during this morning. The payload integration is planned for the next week, on July 14th.
Images attached to this report
Comments to this report:
berni, gherardini - 15:12 Thursday 09 July 2020 (49060) Print this report

With the payload completely assembled we have finalized the cabling of the new devices: Ring Heater and its temperature probe.
From the "eletrical point of view" it has been all checked and tested.

Vacuum (General_status)
Gherardini, Lieunard, Macchia, Pasqualetti - 0:02 Thursday 09 July 2020 (49057) Print this report
NE minitower – leak test

Following the installation of a new ‘viewport’ (shall be reported separately) today the NE minitower has been evacuated and the new parts have been He-tested for leaks (DN350CF + relevant small viewport).

Result = No leaks found on the new parts (Detector range < E-5 mbar.l/s , estimated)

Vacuum (General_status)
Ciardelli, Francescon, Gherardini, Macchia, Menzione, Pasqualetti - 22:50 Wednesday 08 July 2020 (49055) Print this report
SR tower cleaning and evacuation

Today the bottom part of the SR tower has been cleaned in preparation of the PAY integration.

A vacuum cycle has been started too: we shall perform some He-test activity and then will re-vent the tower within friday this week.

Comments to this report:
Vacuum - 16:33 Saturday 11 July 2020 (49066) Print this report

Venting of SR tower has been started.

He-test main results:

  • the newly added viewports #U59 , #H54 (logentry 49041) have passed, LR<5E-8 mbar.l/s
  • the 2nd virola viton o-ring is to be replaced
Menzione, Vacuum - 12:29 Monday 13 July 2020 (49067) Print this report

The mentioned o-ring has been replaced, the SR tower bottom access flange is now open.

 

AdV-INF (Virgo Reference System Geometry)
a.paoli - 19:34 Wednesday 08 July 2020 (49054) Print this report
GNSS permanent station VIRGO00ITA

Yesterday the installation of the GNSS permanent station at EGO site has been completed and started.

The station is part of the "Nuova Rete Fiduciale Nazionele GNSS dell'Agenzia Spaziale Italiana". The reference point is labelled VIRGO00ITA.

Here attached some pictures of the installation (Fig1 to Fig5).

Images attached to this report
AdV-PAY (SR Payload)
D Aisa, E Majorana, L Naticchioni, M Perciballi, A Piluso, F Travasso, H Vocca - 19:22 Wednesday 08 July 2020 (49053) Print this report
SR-01 mirror suspended
Today we suspended the SR-01 mirror in its payload with steel wires.
Tomorrow we will finish the payload assembly.
Images attached to this report
AdV-INF (Virgo Reference System Geometry)
a.paoli, l.paoli, c.fabozzi - 18:47 Wednesday 08 July 2020 (49052) Print this report
Tracking of the holes for fixing the rails of the hoisting system for SQB1

Today we tracked the positions of the holes for fixing the rails on the ceiling of the DET Lab, after opening the upper part of the metallic platform (Fig.1 and 2).

Images attached to this report
Environmental Monitoring (Environmental Monitoring)
dattilo - 17:36 Wednesday 08 July 2020 (49051) Print this report
Comment to HVAC off in MCB (49048)
Some additional info concerning effects on MC suspension and about alert notification.
Fig.1, plot1: the maximum T increase in the building was about 4.5C.
Fig.1, plot2: the maximum T increase in the suspension mechanical filters was about 1.3C.
Fig.1, plots 3-4-5: the maximum elongation was 300um for filter #4, 800um for filter #7. No elongation for filter #0, beacuse there is a control loop acting on it.
Fig.1, plot 6: the correction signals sent to the 2 vertical coils acting on filter #0 to keep it at the set point. At some point (between 5 and 10 volts ?) the coil driver saturated, and probably for this reason the signal become more noisy.

Just to note that even if the T in the building reached the plateau, the T in the tower continued to increase till when the T in the building was restored to its normal value (zoom in Fig2).

In Fig3 there is the list of SMS alerts that the DMS correctly sent to the ACS on-call, that unfortunately were were not considered alarming because of the ongoing test.
Images attached to this comment
Detector Operation (Detector Operation)
boschi, dattilo, letendre, masserot, nenci - 16:36 Wednesday 08 July 2020 (49050) Print this report
temporary displacement of racks on the CEB metallic platform above the DET/FDS area
For the installation of the hoisting system for SQB1 there is the need to perform the fixation holes underneath the racks on the metallic platform (Fig1).

So we had to temporarely displace the racks on the platform. The VAC rack was already displaced yesterday by the VAC team.

Concerning the other 3 racks (1 of DET and 2 of SAT) we procedeed in this way:

- yesterday the DET and SAT loops were opened and the electronics was switched off.

- this morning the electrical lines powering the racks were uncabled by the electricians and then we started to unplug from the tower side those cables that are not long enough (in particular we had to unplug all the cables on N-W Flange) and we kept all the other connections changing temporarily the path (also by cutting all the plastic ties, and moving the cables outside their cable tray). Alain and Nicolas also unplugged some ethernet cables. Then finally we displaced the 3 racks towards North of about 1.5m (Fig2).
Images attached to this report
AdV-AEI Squeezer Integration (General)
menzione, ciardelli, rossi - 11:52 Wednesday 08 July 2020 (49049) Print this report
External squeezer bench and Enclosure removal from DetLab

From Monday to Wednesday morning we dismounted the acoustic enclosure of the external squeezer bench (fig6) and stored in 3 pallets on the south terrace (fig4,7). The external squeezer bench (fig1,2) has been movemented with the Transformer system and carts and stored on the east terrace (fig3,7).
The SQZ area of Det Lab is now free (fig5).

Images attached to this report
Environmental Monitoring (Environmental Monitoring)
fiori - 23:41 Tuesday 07 July 2020 (49048) Print this report
HVAC off in MCB

The temperature inside MC building has rised to about 25 degrees in environmental probes, after a fast rise it seems to have reached a plateau.

Looking at HVAC monitors and IPS current monitors (see Figure) the HVAC system (heaters and chillers) seems to have stopped around 13:20 UTC.

It can be related to the test that was started this afternoon of putting the MCB on a local electrical neutral.

Davide has been contacted. Yet, the situation seems not crtitical and can probably wait till the morning. Having reached the maximum the internal temperature will not increase more during the night.

Images attached to this report
Comments to this report:
dattilo - 17:36 Wednesday 08 July 2020 (49051) Print this report
Some additional info concerning effects on MC suspension and about alert notification.
Fig.1, plot1: the maximum T increase in the building was about 4.5C.
Fig.1, plot2: the maximum T increase in the suspension mechanical filters was about 1.3C.
Fig.1, plots 3-4-5: the maximum elongation was 300um for filter #4, 800um for filter #7. No elongation for filter #0, beacuse there is a control loop acting on it.
Fig.1, plot 6: the correction signals sent to the 2 vertical coils acting on filter #0 to keep it at the set point. At some point (between 5 and 10 volts ?) the coil driver saturated, and probably for this reason the signal become more noisy.

Just to note that even if the T in the building reached the plateau, the T in the tower continued to increase till when the T in the building was restored to its normal value (zoom in Fig2).

In Fig3 there is the list of SMS alerts that the DMS correctly sent to the ACS on-call, that unfortunately were were not considered alarming because of the ongoing test.
Images attached to this comment
Towers Suspensions (Signal Recycling)
dattilo - 17:56 Tuesday 07 July 2020 (49047) Print this report
Activity on in-vacuum cabling of SR tower upper part

This morning the in-vacuum cabling, necessary for the electrical connection of the Ring heater, has been restored. In particular, the in-vacuum cable (labeled "U") dedicated to it , has been reconnected to the feedthrough on the S-W flange.
The cable, installed at the time of AdV and reserved to the payload connection, was "temporarily" unplugged in December 2017, to allow the connection of cables for  Integration of inertial platform prototype in SR tower .

To allow this task, today the tower has been purposely opened and then closed again by the VAC team.
Images attached to this report
AdV-SAT (Suspension control upgrade)
Boschi - 10:49 Tuesday 07 July 2020 (49045) Print this report
SDB1 SA Controls

Suspension controls have been opened and electronics turned off at SDB1 to allow the scheduled intervention on the cabling.

AdV-SBE (MultiSAS for SPRB, SDB2, SIB2 commissioning)
bulten - 11:01 Monday 06 July 2020 (49043) Print this report
Comment to SBD2 tracking check (49036)
Alain Masserot kindly added the Superattenuator signals to the SDB2 processes, so I could track Sa_OB_F0_x and z.
This I did; the SDB2 bench performs just as well as the SNEB bench.
In the files added to this report I show the z-position of the SDB1 Filter-0 stage, and the filter-0 z position of the SDB2 minitower,
as well as the witness signal which is computed from the LVDTs reading out the SDB2 bench and the SDB1 bench.
When tracking is on, the top filter of the minitower tracks the top filter of the output bench (Sa_OB, SDB1), and the differential speed between
the SBD2 and SDB1 benches is becoming much smaller in the 0.1-0.5 Hz region, the region that during bad weather causes
scattered light noise.

In the second plot I show the RMS of the differential LVDT-readings of the benches and the tracking status. One can observe that the
RMS is reduced when tracking is on. In the SNEB bench, scattered light is causing sensitivity limitations if during bad weather the
RMS is above ~ 2; here for SDB2 the RMS is well below that value.
Non-image files attached to this comment
Search Help
×

Warning

×