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Detector Operation (Operations Report)
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mwas - 19:05, Friday 24 March 2017 (37030)Get code to link to this report
Comment to Operator report - afternoon shift 22/3 (Click here to view original report: 36985)
Changing the master laser temperature has changed slightly the position of the resonance for the OMC.
I have changed the OMC parking temperature from 22.56 degrees, to 22.60 degrees, so the OMC is parked slightly below the carrier TEM00.
Detector Operation (Operations Report)
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genin, pillant - 18:54, Friday 24 March 2017 (37028)Get code to link to this report
Comment to Operator report - afternoon shift 22/3 (Click here to view original report: 36985)

We have readjusted the offset on the ML thermal correction output of the rampeauto to bring the laser frequency closer to the RFC fringe.

We had also to change the set point of the temperature of the Master laser crystal from 20.9 to 20.4C (we observed again the bistable behaviour of the PMC as explained in the entry #36611).

Now the MC end mirror displacement needed to find a resonance of the RFC should be of the order of 10 microns.

AdV-COM (AdV commissioning (1st part) )
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ruggi - 18:35, Friday 24 March 2017 (37027)Get code to link to this report
Comment to Locking shift (Click here to view original report: 37018)

The actual working point of PR_X and PR_Y is not determined only by the value written on the DSP set point. In recombined mode, the position is adjusted by a control loop adding the output of an integrator to the local error signal. In this way, the correct working point is always recovered, even if the DSP set point is changing.

Detector Operation (Operations Report)
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genin, pillant - 17:32, Friday 24 March 2017 (37026)Get code to link to this report
Comment to Operator report - afternoon shift 22/3 (Click here to view original report: 36985)

We have readjusted the offset on the ML thermal correction output of the rampeauto to bring the laser frequency closer to the RFC fringe.

Now the MC end mirror displacement needed to find a resonance of the RFC should be of the order of 10 microns.

AdV-COM (AdV commissioning (1st part) )
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ruggi - 16:49, Friday 24 March 2017 (37025)Get code to link to this report
Comment to TASK LN1_(A) (Click here to view original report: 37022)

Plot of transition to low noise.

- first step: marionette reallocation. the low frenquency part of NI correction is suppressed.

- second step: the correction is moved from NI high power board to NE low noise board (amplified by a factor of 8 and a high pass filter, zero @ 4.65 Hz, pole @ 105.5 Hz)

Images attached to this comment
37025_20170324164153_lownoise.jpg
AdV-ISC (Commissioning up to first full interferometer lock)
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mantovani, ruggi, allocca - 16:37, Friday 24 March 2017 (37024)Get code to link to this report
PR shift and alignment control

The task of this morning shift was to find two independent signals to control the shift and the tilt of the PR during the lock acquisition. The idea was to control the shift of the PR mirror with the B2 QPD2 quadrant signals and the tilt by using dithering lines to maximize the arm cavity power.

Unfortunately it was not possible to find both signals.

We have then decided to implement the fixed shift on the PR mirror at step 0.1. The amount of the shift has been evaluated by closing the tilt of the PR on the 0 of the B2 QPD2 signal and maximizing the power.

This procedure works fine and it will be implemented in Metatron, see Figure 1.

Images attached to this report
37024_20170324163659_170324prlockacq.gif 37024_20170324163710_170324prlockacq1.gif
Detector Operation (Operations Report)
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Sposito - 15:58, Friday 24 March 2017 (37023)Get code to link to this report
Operator report - morning shift 24/3

Today, i found the ITF locked in SFSS condition. As requested by the crew i've performed the Fmod Err 3 times successfully.

We had problems with the interferometer, we were not able to reach a stable lock in dark fringe . The crew had recovered the setting value from yesterday in order to restore it.

schedulate activities still in progress

TCS

As you see from the attached plot, the temperature in the ENV..TCS_CHILROOM_TE  external interspace is starting to grow due to the climate change (Spring season).

Telescreen

8.03 LT Telescreen Right crashed/restarted

Oncall

15.15 LT we had some problems with SDB1 with the help of R.Bonnard we have easily solved it

Images attached to this report
37023_20170324153617_builddmsplot.gif
AdV-COM (AdV commissioning (1st part) )
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Boschi, Ruggi, Trozzo, majorana - 13:15, Friday 24 March 2017 (37022)Get code to link to this report
TASK LN1_(A)
Morning shift 23/March
------------------------

We dealt with two main issues:
------------------------------
I) Lock acquisition using HP board with input and locked operation in DF.
II) Lock Swap from INPUT mirror actuation to END mirror on the West arm

activity I) had been preliminary tested successfully before the shift as the lock was more stable using 56MHz signal on March 22nd.
and re-tested during the shift as the stable locking operation was recovered (OK).

activity II) implied recabling at NE site by Valerio, who also prepared a new, suitable configuration of DSP control cards at NE.
The Global Control signals are still delivered to the Mirror control card, which in turn passes mirror control to the LN control card meant
to actuate through the new board (with shaping). Now there are two boards running at 40 kHz (these two boards are both running at 40kHz)

The marionette reallocation was retuned and is kept at the level of NE payload: the swap INPUT=>END is related only to mirror level signals.
Paolo tested the system and it works. Then we kept the strategy in-line. (OK)
At the moment the acquisition is done by acting on the INPUT of N-ARM and on the END of W-ARM, providing both HP actuation.

NEXT SUSP SHIFT:
- re-checking mirror actuation digitalization to allow WI lock acquisition
- retuning the logic on the N-ARM and showing Lock acquisition with both INPUT
- aligning both DSP control cards of W-ARM to what done on NE and in parallel recabling WE mirror control cabling accordingly.

Other activity PR TY:
---------------------
Tried to remove the problem related to TY marionette actuation. Angular disturbance injected by the standard yaw marionette control (30 mHz)
affecting the sideband. ON March 22nd evening the main OpLev was redirected in order to remove a diffusive spot that could
apparently produce the problem. The problem remained and it was necessary to pass to the transversal OpLev, also producing an usable yaw signal
for controlling the payload.
Then at the end of the shift the sensor of this secondary lever (the transversal one) was reset to the zero (in order to exploit low noise sensing)
and its position with respect to the focal plane of the OpLev lens was checked to be of the order of
1% (it can be slightly improved but we'll do it only later if microseism shows-up).
We left in line for the yaw control the signal called Sc_PR_PSDt_X.

NEXT:
- we have to investigate the reason of PSDm OpLev
- check TY noise in DF (probably already doable).
Comments related to this report
ruggi - 16:49, Friday 24 March 2017 (37025)

Plot of transition to low noise.

- first step: marionette reallocation. the low frenquency part of NI correction is suppressed.

- second step: the correction is moved from NI high power board to NE low noise board (amplified by a factor of 8 and a high pass filter, zero @ 4.65 Hz, pole @ 105.5 Hz)

Images attached to this comment
37025_20170324164153_lownoise.jpg
Computers Network (Storage)
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salconi - 12:24, Friday 24 March 2017 (37021)Get code to link to this report
Procdata volume reorganization
A reorganization of the /data/procdata is on the fly.

The reorganization involve ONLY the CBC directory, other users and services will be NOT affected.

A new volume is set up for the CBC, mounted on: /data/procdata/CBC
The old volume is still available at: /data/procdata/CBC.old

The data migration (copy) from old to new is on the fly.
This task will require some hours, we are copying about 60TB.
This job is progressive.

The old files are available, but, please consider them like in read only mode.

This is the only way to expand the area without a long full procdata shutdown.
AdV-DET (Commissioning)
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mwas - 08:37, Friday 24 March 2017 (37020)Get code to link to this report
Comment to SWEB Z control test (Click here to view original report: 37016)
Summary:
* A recombined interferometer is a good enough configuration to see the scattered light on SWEB (and presumably SNEB)
* Controlling the bench Z motion directly at the bench level can work

The bench control in Z loop is designed just to attenuate the micro-seismic motion (than then causes glitches above 10Hz through upconversion).
It subtracts the ground motion using geophones at the base of the tower, but these give a good signal above 0.2Hz. At 0.1Hz there is 40 deg phase difference, and is high-passed at 0.05Hz (information from Joris). So the loop is AC coupled, and has a resonant gain at 0.4Hz

Figure 1 shows the analysis of the last two injections at 0.3Hz, which are in the band where the loop has some gain.
The first half of the figure is with the loop off, and the second with the loop on. Clearly the predicted arches match the glitches in B8_DC during the whole time, and enabling the Z control loop reduces the motion, and the glitches go up to only 15Hz instead of 80Hz.

Figure 2 shows what is going on with the bench motion. In the first half the bench doesn't have the additional control on, and in the second half clearly the motion is reduced, while during all the time the injected motion at the top stage of the suspension stays about the same.

The next step would be to try the loop on a day with high micro-seismic, so the injection is done with the ground and not using the suspension. This would check if using the geophone to remove the ground motion works well enough, or if the mirror local controls signals have to be use instead. Looking at the predicted arches, the latter is slightly better (and used in Figure 1).
Images attached to this comment
37020_20170324081340_screenshotfrom20170324081018.png 37020_20170324082159_screenshotfrom20170324081945.png
AdV-ISC (Commissioning up to first full interferometer lock)
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masserot - 05:37, Friday 24 March 2017 (37019)Get code to link to this report
Comment to Possible SSFS instability (Click here to view original report: 37017)

The digital noise correction  was not propagated to the DSP, the numerical noise  is always computed to monitor this issue.

At 017-03-24-04h25m11-UTC I enable the numiracal noise substraction(NNS)

017-03-24-04h25m11-UTC    info masserot     'NNS subtraction:Enable NNS [ramp duration=1,weigh of digital noise corr=1]' sent to SSFS_Ctrl

first plot show the digital noise without the NNS,

second plot with the NNS ON where one can see  the reduction of the remaining numerical noise

At 2017-03-24-04h44m03-UTC     I reset the DSP filter registers

2017-03-24-04h44m03-UTC    info masserot     'SSFS filter:B4: reset all DSP filters [filter=2]' sent to SSFS_Ctrl

third plot with NNS ON  show the increase of the digital noise correction  after 20mn

the fourth plot with NNS ON show the reduction of the digital noise after reseting the DSP filter registers


 


 

Images attached to this comment
37019_20170324060046_ssfsb4wonns201703244h22utc.png 37019_20170324060055_ssfsb4nns201703244h26utc.png 37019_20170324060110_ssfsb4nns201703244h40utc.png 37019_20170324060118_ssfsb4nns201703244h45utc.png
AdV-COM (AdV commissioning (1st part) )
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bersanetti, chiummo, swinkels, gouaty - 04:10, Friday 24 March 2017 (37018)Get code to link to this report
Locking shift

This is the summary of today's locking shift:

  • the goal was to try and lock the OMC, if the lock at dark fringe was stable and long enough; unfortunately, this was not the case, as initially the dark fringe could not be reached in a stable and reproducible way;
  • after some failed attempts, we found out that removing the PR_F0 X and Y offsets during the MICH offset reduction helped reducing the excess noise, and this made us reach the dark fringe; this however highlighted a bigger problem, that I found out last thing tonight: due to the way things are coded now, an unlock before dark fringe would not bring such setpoints to their original values, causing drifts of the beam position on the PR mirror. I disabled these offsets, but the beam position on the PR mirror should be checked more extensively; as a consequence, what follows should be taken into account with a grain of salt;
  • at this point, when we reached the dark fringe we had no alignment loops closed, as the signals that were used were already been found earlier to be not good anymore;
  • so we tried investigating the error signals for the various loops in order to see if we could close some AA loop:
    • the first thing we noticed is that the gain for the DIFFp_TY loop had changed sign, as this caused a rapid degradation of the DC powers and a misaligned position of the NE mirror after an unlock;
    • we tried to find a good set of setpoints and gains for the DIFFp and the PR loops:
      • we managed to close the PR loops from MICH_SET =0.7 onwards, and the DIFFp loops once in dark fringe; the PR loops helped to keep the mirror aligned a bit during the transition, as we noticed that PR_MAR_TY was moving quite more than the other angular DOFs;
      • we could find a decent configuration for the DIFFp loops, but all the DC powers kept fluctuating quite a lot: the best lock was ~18 minutes long (see Figure);

 

The new settings are temporarily hardcoded in ITF_LOCK, in the states LOCKED_PRITF for the PR loops, and in the state LOCKED_PRITF_DF for the DIFFp loops. I leave the ITF in the LOCKED_SSFS state.

Images attached to this report
37018_20170324040912_dflock.png
Comments related to this report
ruggi - 18:35, Friday 24 March 2017 (37027)

The actual working point of PR_X and PR_Y is not determined only by the value written on the DSP set point. In recombined mode, the position is adjusted by a control loop adding the output of an integrator to the local error signal. In this way, the correct working point is always recovered, even if the DSP set point is changing.

AdV-ISC (Commissioning up to first full interferometer lock)
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bersanetti, swinkels - 02:11, Friday 24 March 2017 (37017)Get code to link to this report
Possible SSFS instability

Today we looked at the data from last night, where we left the ITF in auto-relock with the SSFS; there were a number of unlocks, a few of them seemed due to a stepped ramping of the SSFS correction, which eventually saturated at +-10V. In Figure 1 there is some cleaner trend of a few days ago, in Figure 2 a single instance and in Figure 3 its spectrogram.

We investigated this issue further, and what is seems is that there could be something related to how the correction is computed, maybe in the digital noise correction, given the discrete nature of such trend? We see similar trends also in the channels related to the Digital Noise, but not on the DC power of B4 (see Figure 4).

During a single instance, we could also see a subsequent increase of some broadband noise at each step of the stepped ramp (Figure 5).

Images attached to this report
37017_20170324015240_ssfsunlocktrend.png 37017_20170324020650_ssfsunlockraw.png 37017_20170324020700_ssfsunlockspecgram.png 37017_20170324021054_ssfsfull.png 37017_20170324021103_ssfsfft.png
Comments related to this report
masserot - 05:37, Friday 24 March 2017 (37019)

The digital noise correction  was not propagated to the DSP, the numerical noise  is always computed to monitor this issue.

At 017-03-24-04h25m11-UTC I enable the numiracal noise substraction(NNS)

017-03-24-04h25m11-UTC    info masserot     'NNS subtraction:Enable NNS [ramp duration=1,weigh of digital noise corr=1]' sent to SSFS_Ctrl

first plot show the digital noise without the NNS,

second plot with the NNS ON where one can see  the reduction of the remaining numerical noise

At 2017-03-24-04h44m03-UTC     I reset the DSP filter registers

2017-03-24-04h44m03-UTC    info masserot     'SSFS filter:B4: reset all DSP filters [filter=2]' sent to SSFS_Ctrl

third plot with NNS ON  show the increase of the digital noise correction  after 20mn

the fourth plot with NNS ON show the reduction of the digital noise after reseting the DSP filter registers


 


 

Images attached to this comment
37019_20170324060046_ssfsb4wonns201703244h22utc.png 37019_20170324060055_ssfsb4nns201703244h26utc.png 37019_20170324060110_ssfsb4nns201703244h40utc.png 37019_20170324060118_ssfsb4nns201703244h45utc.png
AdV-DET (Commissioning)
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gouaty, mwas, bersanetti, chiummo, menzione - 00:46, Friday 24 March 2017 (37016)Get code to link to this report
SWEB Z control test

Tonight we tested the longitudinal control of the SWEB bench while the ITF was in recombined mode. In order to check the performance of this loop to cancel microseismic noise, we excited the bench by injecting a line along Z at the top of the suspension.

The following data have been collected:

Line Frequency (Hz) Line Amplitude Loop status Loop gain Start time (utc) Duration (s)
0.1 600 OPEN   21:46:00 300
0.1 600 CLOSED 10 21:51:30 840
0.1 400 OPEN   21:39:30 360
0.1 400 CLOSED 10 22:06:20 240
0.1 400 CLOSED 50 22:15:30 180
0.1 400 OPEN   22:18:40 160
0.1 300 OPEN   22:22:00 90
0.1 300 CLOSED 50 22:24:20 140
0.1 200 OPEN   22:33:30 130
0.1 200 CLOSED 50 22:36:36 180
0.2 300 OPEN   22:51:00 60
0.2 300 CLOSED 50 22:52:00 100
0.3 300 OPEN   22:54:14 64
0.3 300 CLOSED 50 22:55:34 116

The gain was set in line 408 of the SWEB_LC process. For a gain equal to 70 or above it was found that the loop became unstable (growing oscillations).

Data will be analyzed later.

Comments related to this report
mwas - 08:37, Friday 24 March 2017 (37020)
Summary:
* A recombined interferometer is a good enough configuration to see the scattered light on SWEB (and presumably SNEB)
* Controlling the bench Z motion directly at the bench level can work

The bench control in Z loop is designed just to attenuate the micro-seismic motion (than then causes glitches above 10Hz through upconversion).
It subtracts the ground motion using geophones at the base of the tower, but these give a good signal above 0.2Hz. At 0.1Hz there is 40 deg phase difference, and is high-passed at 0.05Hz (information from Joris). So the loop is AC coupled, and has a resonant gain at 0.4Hz

Figure 1 shows the analysis of the last two injections at 0.3Hz, which are in the band where the loop has some gain.
The first half of the figure is with the loop off, and the second with the loop on. Clearly the predicted arches match the glitches in B8_DC during the whole time, and enabling the Z control loop reduces the motion, and the glitches go up to only 15Hz instead of 80Hz.

Figure 2 shows what is going on with the bench motion. In the first half the bench doesn't have the additional control on, and in the second half clearly the motion is reduced, while during all the time the injected motion at the top stage of the suspension stays about the same.

The next step would be to try the loop on a day with high micro-seismic, so the injection is done with the ground and not using the suspension. This would check if using the geophone to remove the ground motion works well enough, or if the mirror local controls signals have to be use instead. Looking at the predicted arches, the latter is slightly better (and used in Figure 1).
Images attached to this comment
37020_20170324081340_screenshotfrom20170324081018.png 37020_20170324082159_screenshotfrom20170324081945.png
Detector Operation (Operations Report)
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menzione - 23:00, Thursday 23 March 2017 (37015)Get code to link to this report
Operator report - afternoon shift 23/3

Upon arrival I found ITF not locked.
Commissioners locked few times in DF and worked on tuning at PR_ITF mode.
The planned activities went on without major problems.

No particulary operations to report.

VPM
16:19 LT ToVac restarted after a crash
21:30 LT TproImgINJ crashed. I tried to restart it without success. Rtpc was pingable but I was not able to link to the machine via ssh. OnCall intervention was needed to reboot Rtpc10. At 22:10 LT back On. see entry

AdV-DAQ (Local Position Read-Out and Beam Imaging)
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masserot - 22:13, Thursday 23 March 2017 (37012)Get code to link to this report
rtpc10 in strange state

The TproImhInj became red at the VPM level .  Using a opened session on rtpc10 I tried to perform the ps command without success .

So I rebooted  the rptc10  and then I restarted its servers

AdV-DET (Commissioning)
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gouaty, bersanetti, chiummo, mantovani, ruggi - 20:53, Thursday 23 March 2017 (37010)Get code to link to this report
B7 and B8 quadrants centering

This afternoon the B7 and B8 beams have been precentered on the SNEB/SWEB quadrants while the ITF was locked in recombined. The corresponding signals when after this precentering are shown in Fig.1 and Fig.2.

The following steps were performed on the picomotors:

B7 Mmot1 V +15800 ; B7 Mmot1 H +2150

B7 Mmot2 V +11100 ; B7 Mmot2 H -1000

B8 Mmot1 V +17600 ; B8 Mmot1 H +1000

B8 Mmot2 V +5600 ; B8 Mmot2 H +700

Then the ITF was locked to the dark fringe. The corresponding signals on the quadrants are shown in Fig.3. On SNEB the B7 quadrants asymmetry channels remains around 1V, indicating that the centering can still be slightly improved, and showing that the alignment fluctuations are sufficiently small to be monitored with these quadrants.

On the other hand on SWEB, the B8 quadrants asymmetry signals have large fluctuations (from 0 to 10V), which will make it difficult to avoid the ADC saturation.

We will need to check on longer time scale at dark fringe whether the beam centering on these quadrants can be further improved.

It must be highlighted that while this activity was being performed, a drift of the B8 beam position of the camera and on the photodiode was observed. This drift was recovered by changing the setpoint of the SWEB bench in TX from 90 to 115 urad. At this time, it is not understood what caused such a drift. We thought about a possible thermal effect due to the switching on of the SWEB picomotor drivers, but the beam drift seems to have started a few minutes before the use of the drivers. To be further investigated.

Images attached to this report
37010_20170323202643_b7qdcentered.png 37010_20170323202650_b8qdcentered.png 37010_20170323202656_b7b8qdcentereddf.png 37010_20170323204732_b8transient.png
AdV-DET (Commissioning)
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gouaty - 19:40, Thursday 23 March 2017 (37009)Get code to link to this report
Quadrants offsets check on B7 and B8

This afternoon, the offsets of the B7 and B8 quadrants were checked again. The following offset errors were found:

B8_QD1 H 1.41015e-05      V -2.86787e-06      Sum 2.62104e-06
B8_QD2 H 5.88773e-06      V 2.50745e-07      Sum -1.95928e-06

B7_QD1 H -3.47691e-05      V 6.88268e-06      Sum -2.66364e-05
B7_QD2 H 2.40142e-05      V 3.76547e-06      Sum 5.33576e-06

Only offset errors above 1.0e-06 V were corrected.

Detector Operation (Operations Report)
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Gherardini - 16:00, Thursday 23 March 2017 (37008)Get code to link to this report
Operator report - morning shift 23/3
This morning I found the itf in LOCKED_SSFS state; some work on NI TCS bench had been performed from 8:00Lt to 8:30Lt then before starting the foreseen suspension shift the activity was focused to recover the lock in dark fringe. Finally at about 11:00Lt we succeded to relock in dark fringe; the work on low noise actuation started with some hardware intervention at north end done by Ettore and Valerio.
After some other works the itf was successfully locked in dark fringe with the north arm in low noise configuration.

-daq
At about 14:50Lt we started to have some problem with daq, no data are available for the users; with Franco we were trying to understand what was happening at the end thanks to the remote help of Alain the problem was quickly solved (see Alain's entry).
AdV-DAQ (Data collection)
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masserot - 15:22, Thursday 23 March 2017 (37006)Get code to link to this report
FbmAlp crash - Data lost: miss 1317 seconds between 1174312302.0 and 1174313619.0

At 13h51UTC  FbmAlp crashed, but it remains green at VPM level .  A reloadConfig of VPM allowed to see as a dead server and to restart it .

As consequence there is 1317 seconds between 1174312302.0 and 1174313619.0 of data missing for all the streams (RAW,RDS,TREND)

AdV-DET (Output mode cleaner)
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mwas - 15:01, Thursday 23 March 2017 (37005)Get code to link to this report
Comment to OMC short scan on dark fringe (Click here to view original report: 36980)
Today, mid-day, I have made a larger range, slower scan of the OMC with the ITF at dark fringe.

Figure 1 shows the scan (in the opposite direction than previously), looking at the camera at the same time, I have noted the shape of the modes going through the OMC.
Found only two TEM00 modes (expected 3: carrier, lower side-band, upper sideband), that would mean that the upper side-band TEM00 is hiding underneath the carrier TEM10 mode, which would be 10 times brighter.
Hence the small a clean TEM00 is the lower side-band, and the brighter and jagged TEM00 is the carrier (contrary to what I have said in the previous entry).

It actually is not surprising for the carrier TEM00 to be jagged. The loop is on dark fringe, so we just see here the noise of the loop fluctuating around the proper dark fringe. This means that we could try to lock the OMC without a dark fringe offset, as there is substantial offset already (contrast defect?). But of course having some controlled dark fringe offset would make it easier and presumably lower the power fluctuations.
Images attached to this comment
37005_20170323144003_rect4560.png
AdV-DET (Commissioning)
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gouaty - 11:56, Thursday 23 March 2017 (37002)Get code to link to this report
Electronics offsets of quadrants photodiodes in central building updated

Yesterday afternoon, after the activity on the B1p quadrants ADC channels, the offsets of the B1p, B2, B4 and B5 quadrants have been checked and updated in the configuration files. The new values of the offsets recorded, as well as the offsets variations are given below:

New Offsets:

DBOX_ADC2378_CHANNEL    SDB2_B1p_QD1_H  0       50000   ""      5.2083  -1.25387e-01    V
DBOX_ADC2378_CHANNEL    SDB2_B1p_QD1_V  2       50000   ""      5.2083  7.72063e-03     V
DBOX_ADC2378_CHANNEL    SDB2_B1p_QD1_Sum        4       50000   ""      5.2083  2.22852e-02     V
DBOX_ADC2378_CHANNEL    SDB2_B1p_QD2_H  1       50000   ""      5.2083  3.60286e-03     V
DBOX_ADC2378_CHANNEL    SDB2_B1p_QD2_V  3       50000   ""      5.2083  -2.27331e-02    V
DBOX_ADC2378_CHANNEL    SDB2_B1p_QD2_Sum        5       50000   ""      5.2083  1.55376e-05     V

DBOX_ADC2378_CHANNEL    SIB2_B2_QD1_H   0       100000  ""      2       -3.43249e-04    V
DBOX_ADC2378_CHANNEL    SIB2_B2_QD1_V   2       100000  ""      2       -5.64622e-03    V
DBOX_ADC2378_CHANNEL    SIB2_B2_QD1_Sum 4       100000  ""      2       1.64656e-02     V
DBOX_ADC2378_CHANNEL    SIB2_B2_QD2_H   1       100000  ""      2       1.29715e-03     V
DBOX_ADC2378_CHANNEL    SIB2_B2_QD2_V   3       100000  ""      2       6.39744e-03     V
DBOX_ADC2378_CHANNEL    SIB2_B2_QD2_Sum 5       100000  ""      2       5.45311e-03     V

DBOX_ADC2378_CHANNEL    SPRB_B4_QD1_H   0       50000   ""      2       -4.32259e-03    V
DBOX_ADC2378_CHANNEL    SPRB_B4_QD1_V   2       50000   ""      2       -2.68241e-03    V
DBOX_ADC2378_CHANNEL    SPRB_B4_QD1_Sum 4       50000   ""      2       9.53401e-04     V
DBOX_ADC2378_CHANNEL    SPRB_B4_QD2_H   1       50000   ""      2       -2.34354e-03    V
DBOX_ADC2378_CHANNEL    SPRB_B4_QD2_V   3       50000   ""      2       -7.65001e-03    V
DBOX_ADC2378_CHANNEL    SPRB_B4_QD2_Sum 5       50000   ""      2       -7.08220e-03    V

DBOX_ADC2378_CHANNEL    SDB2_B5_QD1_H   0       50000   ""      2       -4.29360e-03    V
DBOX_ADC2378_CHANNEL    SDB2_B5_QD1_V   2       50000   ""      2       5.66446e-03     V
DBOX_ADC2378_CHANNEL    SDB2_B5_QD1_Sum 4       50000   ""      2       1.10390e-02     V
DBOX_ADC2378_CHANNEL    SDB2_B5_QD2_H   1       50000   ""      2       9.00722e-03     V
DBOX_ADC2378_CHANNEL    SDB2_B5_QD2_V   3       50000   ""      2       -7.32649e-03    V
DBOX_ADC2378_CHANNEL    SDB2_B5_QD2_Sum 5       50000   ""      2       8.38312e-03

Offset variations:

B1p_QD1 H -7.554e-02   V 5.14e-03   Sum 1.122e-02    (approximate values because this was corrected by hands)
B1p_QD2 H 2.64e-03    V -1.401e-02          Sum -2.0e-03   (approximate values because this was corrected by hands)

B2_QD1 H -1.43388e-04    V 1.40667e-04   Sum 1.10561e-04
B2_QD2 H -2.49805e-05    V 3.74059e-04   Sum 3.86534e-04

B4_QD1 H 3.67723e-05     V -8.32762e-05          Sum 7.93590e-05
B4_QD2 H -6.44691e-05    V 9.83259e-05   Sum 3.82397e-05

B5_QD1 H 3.51310e-04     V 1.47820e-04   Sum -1.43122e-04
B5_QD2 H -1.61659e-04    V -1.36858e-05          Sum 1.58803e-04

As expected large offsets corrections were performed on B1p quadrants, due to the change of the input gain.

AdV-COM (AdV commissioning (1st part) )
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mantovani, ruggi - 11:38, Thursday 23 March 2017 (37001)Get code to link to this report
Comment to Post-shift relock attempts (Click here to view original report: 36991)

The problem was that in Metatron the angular drift control for the End mirror was not switched off when the ITF unlocks. Thus the two cavity mirrors were misaligned during the lock acquisition. Now the switching off has been added in the down state.

I put back the SSFS gains.

AdV-DET (Commissioning)
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germain, gouaty, letendre, rolland - 11:38, Thursday 23 March 2017 (37000)Get code to link to this report
Installation of adaptors on B1p quadrants DC channels

Yesterday afternoon, we installed 6 adaptors on the ADC channels 0-5 of the mezzanine S/N 58 of the DAQ box S/N10 (SDB2_DBOX_RightUp). This concerns the DC channels (Sum, H, V) of the two B1p quadrants.

With these adaptors the input gain of the ADC mezzanine is now 0.192 instead of 0.5 as it was before. In order to make this operation transparent we have updated the gains in the SDB2_dbox_bench configuration file (lines 232-237) with a gain equal to 5.2083 instead of 2.

Fig.1 and Fig.2 show the B1p quadrants and photodiode DC signals during a transition to dark fringe that occured before performing this modification. Fig.3 and Fig.4 show the same signals during another transition to dark fringe, this time after the modification of the ADC input gain was performed. As expected  the ratio between the longitudinal photodiode and the quadrants remain the same. As it can be seen on Fig.3 and Fig.4 the "Sum" signal of the quadrants can now go above 10V.

Images attached to this report
37000_20170323112113_b1pbeforechangezoom.png 37000_20170323112135_b1pbeforechangezoomratio.png 37000_20170323112146_b1pafterchangezoom.png 37000_20170323112156_b1pafterchangezoomratio.png
AdV-DAQ (Data Acquisition and Global Control)
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rolland, van Beuzekom - 11:19, Thursday 23 March 2017 (36999)Get code to link to this report
Comment to DAQ of phase cameras (Click here to view original report: 36989)

Typo : MuxDemux is number 22 and not 24.

We swapped the fiber connection from MuxDemux to rrtpc around 11h00 LT.

  • MuxDemux 22, link 7 is connected to the new rtpc16 in the ComputingRoom, which is the final configuration. The phase camera data are acquired by the new rtpc (PC_Fb process).
  • MuxDemux 22, link 6 is connected to the old rtpc18, link0. This link can be used to configure the board. It can be removed when the software will be updated and configuration can be done from rtpc16.

I have stopped the now useless process PC_Fb_rtpc18.