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Safety (Laser Safety)
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genin, pillant, de rossi - 21:06, Thursday 22 February 2018 (40666)Get code to link to this report
Beam blocked again in the laser lab.

At the end of the work (17.00LT), we have blocked again the laser beam in the laser lab.

Note that the pick-off of the main laser is still arriving on the External squeezer bench.

Injection system (General activities)
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pillant, genin, de rossi, magazzu, boschi, carbognani, vacuum team - 18:42, Thursday 22 February 2018 (40665)Get code to link to this report
beam alignment towards the ITF recovered

After the issue reported in the entry #40650, we open the tower today.

Once entered in the INJ tower we found as expected the M1 mount strongly tilted (see attached pictures).

The IB was controled as PR in the last known good position (02/02/2018). Using an Half wave plate we bypass the IMC and

using an other one on the IB we recover the right polarization before the faraday isolator.

Using the faulty picomotor we were able to recover the B2 beam reflected by the PR. The picomotor was moved by about

30.000 steps which is corresponding to a tilt of about 11 mrad position (from -1920 to -30627) !

From the software side, no movements are identified in the logfile...

We will report the reason of the problem once understood.

NB : it seems the "chiocciolone" of the INJ suspension doesn't work, to be checked by SAT asap.

Images attached to this report
40665_20180222182748_photo4.jpg 40665_20180222182807_m1.png
Vacuum (Mode cleaner)
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Vacuum - 18:09, Thursday 22 February 2018 (40664)Get code to link to this report
MC venting

Venting is in progress

Computers Network (Storage)
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masserot - 17:42, Thursday 22 February 2018 (40663)Get code to link to this report
Comment to stol01 CentOS 7 update teminated (Click here to view original report: 40661)

The RAW stol01 processes were restarted today around 15h56m25UTC

AdV-DAQ (Data Acquisition and Global Control)
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masserot,rolland - 17:19, Thursday 22 February 2018 (40662)Get code to link to this report
Comment to SSFS - DSP low noise filter implemetation (Click here to view original report: 40545)

Acl v050p12 /virgoStaging

The first plots show over 2 days the evolution on the digital noise when we use the low noise filter implementation with the boost filter inside the SSFS DSP:

  • the filter has the following bi-quad implementation in the S space:
    • S space: "ZERO_AdV"(0)-1Hz Q:0 - "POLE_AdV"@(51712.6)50000Hz Q:1.5  - Gain: 1 - Coef 1 0 0 / 1 2.05179e-06 9.47214e-12
    • S space: "ZERO_AdV"(0)0Hz Q:0 - "POLE_AdV"@(1650.06)1650Hz Q:25  - Gain: 1 - Coef 0 1 0 / 1 3.85816e-06 9.30339e-09
    • S space: "ZERO_AdV"(1000.01)1000Hz Q:1 - "POLE_AdV"@(50)50Hz Q:0.7  - Gain: 1 - Coef 1 0.000159153 2.53296e-08 / 1 0.00454728 1.01321e-05
    • S space: "ZERO_AdV"(1500.04)1500Hz Q:1 - "POLE_AdV"@(50)50Hz Q:1  - Gain: 1 - Coef 1 0.0001061 1.12572e-08 / 1 0.0031831 1.01321e-05
    • S space: "ZERO_AdV"(1650.06)1650Hz Q:5 - "POLE_AdV"@(14)14Hz Q:0  - Gain: 1 - Coef 1 1.92908e-05 9.30339e-09 / 1 0.0113682 0
  • one can see that  the usal jumps on the SSFS_B4_DigitalNoise_corr_{min,max}  channels have disappears
  • nertheless the difference between the SSFS_B4_DigitalNoise_corr_min and the SSFS_B4_DigitalNoise_corr_max increase in the 2 days of  tests
  • and the residual digital noise  SSFS_B4_digitalNoise_DS_{min,max} remains at the same level.

Looking at the fullband channel (500kHz), we found that

  • a line at 250kHz appears at the DSP filter output (low noise implementation) and at the RTPC filter output (standard filter implementation) too
  • the amplitude of this line increase slowly with the time
  • and that  the line frequency is always half of the input channel  frequency.

 

Acl trunk /olusers/masserot launched only on the SSFS_Ctrl server.

The second plot show  over 6days  the evolution on the digital noise, in the same conditions as previously, with the zero ordered in other way inside the bi quad:

  • the filter has now  the following bi-quad implementation in the S space:
    • S space: "ZERO_AdV"(0)0Hz Q:0 - "POLE_AdV"@(51712.6)50000Hz Q:1.5  - Gain: 1 - Coef 0 1 0 / 1 2.05179e-06 9.47214e-12
    • S space: "ZERO_AdV"(1000.01)1000Hz Q:1 - "POLE_AdV"@(1650.06)1650Hz Q:25  - Gain: 1 - Coef 1 0.000159153 2.53296e-08 / 1 3.85816e-06 9.30339e-09
    • S space: "ZERO_AdV"(1500.04)1500Hz Q:1 - "POLE_AdV"@(50)50Hz Q:1  - Gain: 1 - Coef 1 0.0001061 1.12572e-08 / 1 0.0031831 1.01321e-05
    • S space: "ZERO_AdV"(1650.06)1650Hz Q:5 - "POLE_AdV"@(50)50Hz Q:0.7  - Gain: 1 - Coef 1 1.92908e-05 9.30339e-09 / 1 0.00454728 1.01321e-05
    • S space: "ZERO_AdV"(0)-1Hz Q:0 - "POLE_AdV"@(14)14Hz Q:0  - Gain: 1 - Coef 1 0 0 / 1 0.0113682 0 - B4_Corr_RTPC_BK1:O3_SSFS_B4flt_base*O3_SSFS_B4flt_boost3 - "double_II"(0) -  resetReq 0
  • in this case the difference between the SSFS_B4_DigitalNoise_corr_min and the SSFS_B4_DigitalNoise_corr_max  remains constant during the 6 days of tests

 

The third plot show the FFT spectrum of

  • the input filter channel
  • the DSP 40Bit output filter 
  • and in the third graph the standard SSFS_dac ouput(black), the digital noise correction(orange) and in the remaing noise (green)

 

The new bi-quad implementation is:

  • less noisy
  • and stable over the time

This new bi-quad repartition will be available in the next Acl release .
 

Images attached to this comment
40662_20180222171738_20180209ssfsdigitalfilternoise.png 40662_20180222171747_20180216ssfsdigitalfilternoise6days.png 40662_20180222171754_20180216ssfsdigitalfilternoisefft.png
Computers Network (Storage)
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salconi - 16:48, Thursday 22 February 2018 (40661)Get code to link to this report
stol01 CentOS 7 update teminated
please start the rawdata flow on stol01 (CentOS7)
so we can test if all is working well or there are
missing/mistakes somewhere...
Comments related to this report
masserot - 17:42, Thursday 22 February 2018 (40663)

The RAW stol01 processes were restarted today around 15h56m25UTC

AdV-DET (Commissioning)
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bonnand - 14:27, Thursday 22 February 2018 (40659)Get code to link to this report
Balancing of SDB1 with marionetta counter-weigth after pumping

Yesterday I acted on the marionetta of SDB1 as the correction sent to the LVDTs were a bit high after pumping the tower :

MH.MA.tx ==> - 3000 steps (CCW)

It has to be noted that the marionetta counterweight were put at their center last week before balancing he bench with the new Faraday isolator on SDB1.

AdV-DAQ (Data collection)
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masserot - 14:26, Thursday 22 February 2018 (40658)Get code to link to this report
RDS stream running on stol03

On request of the Computing Department, the processes involved on th RDS stream are now running on stol03 instead of stol01.

The operation was done today at 9h30UTC.

Towers Suspensions (West End)
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dattilo, passaquieti - 12:33, Thursday 22 February 2018 (40657)Get code to link to this report
Problem with motor SW at WE

Also in occasion of WE tuning, I was called by Paolo complaining of a blocked motor.

It was the fishing rod on F#7.  The motor GUI was displaying that the motor had reached a  limit switch (the one labeled CW) and that the 2 limit switches (CW and CCW) were swapped  (INV led).

This time, instead of trying to act at level of connector pinout, I suspected from the beginning a SW problem.

So, we contacted Giulio, that overridden the protection of the Inverted limit switches.  After that, we succeded in moving the motor  and it come out that the INV led was wrong.

So, it happened again that the motor SW errouneously recognized the status of the limit switches as swapped, and consequently set the  INV led to red on the GUI, blocking for safety the use of the motor.

  According to Giulio this is a known bug, and he is working on a new SW version.

AdV-SAT (Long SAs Upgrade Installation (End Towers))
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berni, gherardini - 12:24, Thursday 22 February 2018 (40656)Get code to link to this report
WE electrical check
After the operations on the WE suspension: opening of the upper part and IVC, filter tuning, installation and removal of the dummy payload we checked the electrical connections of the cables inside the tower: F,R,S,T,U,V,W,Z.

everything is fine except F0 trolley 01 and of range that was short-circuit, fixed.
Towers Suspensions (West input)
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dattilo, nenci, ballardin, passaquieti, ruggi - 12:20, Thursday 22 February 2018 (40655)Get code to link to this report
Problem with motor driver SW&HW at WI

On Thu 8th Feb, we were called by Paolo and Roberto that during their tuning of WI suspensions they find the F#3 fishing rod motor blocked.

Indeed, the motor GUI was displaying that the motor had reached a  limit switch (the one labeled CW) and that the 2 limit switches (CW and CCW) were swapped.

So, Federico and I  performed a swap of the limit switched acting at level of the Lemo connector plugged on the F#3 motor.

Stangely, the situation at level of the motor GUI remained unchanged (we would have expected that after the pin swapping the CW led went to green and  the CCW led went to red).

Therefore, we restored the pinout of the Lemo connector, because the problem was not depending on it.

So, due to this inconsistence, we suspected of the motor SW  and we  called Giulio, after  several trials and investigation, (he had to override some SW protection), we succeded in moving the motor and concluded that the problem were:

- at HW level  on the specific channel (#8) where the motor is connected.

- at SW level, in general due to the INV led.

Finally, after about 1h spent on this troubleshooting, Paolo and Roberto could continue their tuning activity.

AdV-EGO (Contamination Control)
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menzione, francescon - 10:02, Thursday 22 February 2018 (40654)Get code to link to this report
Contamination control inside INJ tower

The contamination control inside the lower part of the tower has been performed (as usual) with the surface particle counter just after the opening:

In the attached figure the results of the measurements.

More details for the measurements in the other towers at: https://apps.virgo-gw.eu/dust/

Images attached to this report
40654_20180222100113_inj1.jpg
Safety (Laser Safety)
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genin - 09:36, Thursday 22 February 2018 (40653)Get code to link to this report
Beam temporarily blocked on the laser bench

The beam has been temporarily blocked on the laser bench. It will be sent back to the INJ tower later (we will communicate it on the logbook).

AdV-PAY (NI and WI Payloads)
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Majorana, Perciballi, Menzione, Ciardelli, Naticchioni, Hasegawa, Minenkov - 20:26, Wednesday 21 February 2018 (40652)Get code to link to this report
WI payload integrated
Today the West Input monolithic payload was integrated with the SA.
Tomorrow balancing and TCS alignment.
Images attached to this report
40652_20180221202524_perciballi.jpg
Vacuum (Injection)
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Vacuum - 20:07, Wednesday 21 February 2018 (40651)Get code to link to this report
IB tower venting

venting is in progress

Injection system (General activities)
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genin, pillant, casanueva, boschi, ruggi, carbognani, majorana, pasqualetti - 18:56, Wednesday 21 February 2018 (40650)Get code to link to this report
Problem found with the beam alignment towards the ITF

Yesterday, it was planned o relock the north arm in order to send the reference beam reflected by the NI mirror on the squeezing bench for the fine alignment of the squeezer beam.

The ISC team called us since they were not able to find the beam neither at NE nor the B2 one on SIB2. They noticed the scattered light coming from the beam passing through the meniscus lens was not centered anymore on it.

First, we looked at the IMC and RFC cavity signals and everything looked as usual. The IB bench seemed to be in a position similar to the one we had last week when we installed the FI on the SDB1 bench. Then, we moved the PR  mirror quite a lot in order to see if we were able to find the B2 beam (without success).

We started to check the beam position on the optics of SIB1 bench. The beam is passing properly through the Faraday isolator. It seems to pass properly inside the IPC.

It looks properly reflected by SIB1_M3 and M4 and it seems well centered on SIB1_M1 and M2 parabolic mirrors. Then the beam looks miscentered by several cms on the meniscus lens.

Paolo, Valerio and Ettore checked that the PR mirror was fine.

Franco checked that there were no accidental movement of SIB1 actuators: no displacemeent of the motors has been asked since the last commissioning period.

We also asked to Antonio to open and close the IB t PR cryolink valves without noticing any significant change.

Up to now we have no clue about the origin of the problem. The beam was fine last friday (since it was used on the Detection system for OMC related works).

Between Friday and yesterday afternoon something wrong happened.

In consequence, it has been decided to anticipate the opening of IB tower. We will enter the tower tomorrow morning to check what could be wrong on the bench.

We plan to block the bench in a position close to the suspended one to check the beam path on SIB1.

The beam is now blocked on the laser bench.

AdV-EGO (Contamination Control)
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menzione, ciardelli - 16:46, Wednesday 21 February 2018 (40649)Get code to link to this report
Comment to Contamination control inside WI tower (Click here to view original report: 40605)

10:00 LT
In the attached figure the results of the surface particle counter measurement upon opened the tower after vacuum cycle.

Images attached to this comment
40649_20180221164957_wi2.jpg
AdV-DAQ (Calibration)
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estevez, rolland - 13:27, Wednesday 21 February 2018 (40647)Get code to link to this report
PCal installation on NE

A photon calibrator has been installed in the NE building on February 20th, 2018.

A DAQ-box and a laser have been put on the NE rack.

Figure 7  shows the injection bench where the laser beam is sent to NE mirror through a viewport ; one photodiode (PD1) and a PSD (PSD1) monitor the laser power and the position of the laser beam.

The reflection bench has been set up too, containing a photodiode (PD2) and a PSD (PSD2) to monitor the laser power and the position of the laser beam once reflected on the NE mirror.

We used the opportunity to also install temperature probes on NE and WE PCal benches as reported in logbook entry 40643 : https://logbook.virgo-gw.eu/virgo/?r=40643

Measurements were performed the 20th and the 21st, February :

- The laser dac command (V) vs the laser power on the injection bench (W) (Figure 1) ; the behaviour is linear as expected with a slight offset due to the threshold of the laser command (< 0.1 V).

- The voltage of PD1 (V) vs its bias voltage (V) at max power 3W and at 2W (Figure 2 and 3) ; showing that the response is flat above Vbias ~ 2 V, OK the photodiodes have Vbias = 4.5V.

- We checked the level of noise of PD1 with a laser power 2.1W and the level is not stable in time (same behaviour with local control and remote control of the laser but the 50Hz line appears only in remote control), Figure 4 shows 4 plots of the noise level spaced with ~1 minute in local control ; we noticed that there are sometimes voltage hops in PD1 (see Figure 4, PD1_raw blue 57min06 sec) which increase the noise level.

               -> Those voltage hops do not appear in the laser dac command signal.

- When the laser pump is off, the noise level is around 1e-7 V/sqrt(Hz) (Figure 5).

- The voltage of PD1 (V) vs the laser entrance power (W) (Figure 6) ; the behaviour is linear as expected with little variations due to the time of stabilization of the powermeter with respect to a power laser beam ramp in entrance. The ramp lasts ~4 minutes (up + down) and goes from 0.6W to 3W.

 

Thus we need to investigate the variations of noise level and the voltage hops in the photodiode, working on a control loop of the laser power.

The photodiodes on the reflection bench have been aligned but NE mirror was unlikely in a good position since the NE arm couldn't be locked. We should check again the alignment once the NE arm will be locked.

We will also check if there are variations of power linked to variations of temperature.

Images attached to this report
40647_20180221114421_laserdaccmdvspower.png 40647_20180221114644_pd1vsvbias3w.png 40647_20180221114651_pd1vsvbias2w.png 40647_20180221120727_pd1fftlocal2w4.png 40647_20180221123810_pd1fftlocal0wnopump.png 40647_20180221123819_pd1vspowerbis.png 40647_20180221123834_img20180220213500.jpg
AdV-DAQ (Data Acquisition and Global Control)
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rolland, pacaud, letendre, masserot, genin - 13:05, Wednesday 21 February 2018 (40648)Get code to link to this report
Replace EEroom DaqBox used for EIB-SAS control and PSDs (dbox 35 replaced by 54)

The DaqBox 35 used for the EIB-SAS PSDs in the EEroom  (2 ADC mezzanines and one DAC1955 mezzanine) was not working since some weeks, with flat output signals.

I have replaced it by the DaqBox 54 this morning (all mezzanines were also replaced).

Connecting the ADC signals one by one, it appeared that there must be an issue with the cabling of the PSD or cable called PSD_B_laserlab. The corresponding ADC channels output was completely flat when connected alone, and all the 8 channels of the ADC mezzanine became completely flat in some cases when also other channels were connected in parallel with these ones.   --> the cabling must be checked.

SInce about  12h30 LT, I have reconnected 8 ADC channels that look fine and let the 4 faulty signals not connected. I have also reconnected the 8 DAC channels (EIB-SAS and phase camera channels).

The DaqBox 35 will be brought back to LAPP for checks.

Images attached to this report
40648_20180221130441_p1180793.jpg
AdV-AEI Squeezer Integration (external squeezer table)
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De Laurentis, Tacca, Sorrentino - 10:34, Wednesday 21 February 2018 (40645)Get code to link to this report
Telescope out beam characterization
To allow the linear translation stage MT2 Mirror to work at full range, we replaced a part of the MT2 holder.

After the replacement, we realigned the telescope and characterized the out beam again.
The results are shown in the attached picture.

wox = 1.34 +/- .02 mm
woy = 1.39 +/- .01 mm

zosx = 7840 +/- 90 mm
zosy = 7104 +/- 70 mm

The beam, according with the input one, seems to be not perfectly gaussian.

Images attached to this report
40645_20180221103054_telout20022018.png
AdV-DAQ (Data Acquisition and Global Control)
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mours, rolland - 09:31, Wednesday 21 February 2018 (40644)Get code to link to this report
Timing tests on SWEB
This morning, starting from 7:40 UTC, we did some test on the timing configuration of the SWEB DAQboxes. The initial configuration has been restored at the end of the test.
AdV-DAQ (Environmental Monitoring)
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rderosa, rolland, estevez - 19:56, Tuesday 20 February 2018 (40643)Get code to link to this report
Temperature probes on PCAL benches

Today we placed a temperature probe on each photon calibrator bench at end buildings. The signals are now available and their name are:

ENV_PCAL_NEB_TE1: temperature on PCAL-NEB bench (laser bench);

ENV_PCAL_NEB_TE1: temperature on PCAL-NEB bench (second bench);

ENV_PCAL_WEB_TE1: temperature on PCAL-WEB bench (laser bench);

ENV_PCAL_WEB_TE1: temperature on PCAL-WEB bench (second bench);

In the figure the temperatures of the benches in the last hours are shown. Note that there is work in progress on NEB benches.

Images attached to this report
40643_20180220195454_pcalte.png
AdV-TCS (High reflectivity face sensing)
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nardecchia - 19:52, Tuesday 20 February 2018 (40642)Get code to link to this report
Noise measurement on the NI HWS-HR bench

The NI HWS-HR noise measurement has started at 19.29 LT and it will end tomorrow morning around 8 am.

Safety (Laser Safety)
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nardecchia - 18:24, Tuesday 20 February 2018 (40641)Get code to link to this report
CO2 laser switched off

Both CO2 lasers have been  switched off  to perform some tests tomorrow morning (only the 5V DC TTL  is switched off).

AdV-AEI Squeezer Integration (external squeezer table)
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delauren - 18:19, Tuesday 20 February 2018 (40640)Get code to link to this report
Comment to Squeezer Out Beam Characterization (Click here to view original report: 40636)
ATTENTION: the xlabel of the figures 1-4 is wrong. The right one is 'Dstance from the Squeezer BOX out'