Kiwamu, Stefan

Using the pr2spotmove script (see alog 28420), we moved the spot on PR2 in lock by almost 1 milimeter.

Conclusions:

- The carrier recycling gain desn't care about the PR2 spot positon.
- The POP beam from PR2 to the invacuum POP diode is fairly close to the edge of the visibility aperture. This might be an issue for LSC aux noise.

Details:

- To be able to explore the full range of motion, we had to switch back to the REFL B WFS for PRC2 / PR3 control. We BTW verified that this WFS also works at 40W (and during the power increase).
- With that, the move-limiting aperture is the path from PR2 to POP. We can move until the POP_A loses the beam. The pitch and yaw min/nominal/max values for PR3 alignment angles are
    Pitch value / delta:
     min: -302.95  / -4.6urad
     nom: -298.35 / 0urad
     max: -275.35 /  +23urad
    Yaw value / delta:
     min: 257.45 / -16urad
     nom: 273.45 / 0urad
     max: 281.45 / +8urad
  Notice how close to the edge we are in pitch - this could be a factor for PRCL/SRCL/MICH auxiliary length noise and scatter coupling. We have to revisit this in low-noise.

- The 27.6urad move in pitch (24urad in yaw) peak-to-peak move corresponds to 0.9mm (0.8 mm) for the PR2 spot position. Note though that for the beam in transmission of PR2 that corresponds to several spot sizes of motion. (The virtual beam waist behind PR2 is 114u, i.e. we moved the spot more than 7 beam waists. As a result the beam completly left the POPAIR camera view.)

Title:  07/15/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
State of H1: IFO unlocked. Relocking not successful. Need to do initial alignment.   
Commissioning: IFO locked at DC_READOUT, 2.0W, Wind is a moderate breeze (13 – 18mph) and a corresponding bit of elevated X and Y seismic motion. 
Outgoing Operator:  None
 
Activity Log: All Times in UTC (PT)

15:00 (08:00) Start of shift
15:52 (08:52) Richard – Going to HAM6 to check if HV shutter is on
15:55 (08:55) Lockloss – Richard turned on HV shutter
16:22 (09:22) Keita & Travis – Going to End-Y to reset camera
16:57 (09:57) Kyle – Going to Mid-X to check on moving a vacuum pump
17:06 (10:06) Keita & Travis – Out of Mid-Y
17:10 (10:10) IOF locked at NOMINAL_LOW_NOISE 24.9W
17:15 (10:15) Lockloss – commissioning
17:45 (10:45) Kyle – Back from Mid-X
18:03 (11:03) Richard – Going into LVEA to work on HV shutter near HAM6
18:08 (11:08) Richard – Out of LVEA
18:39 (11:39) IFO locked at DC_READOUT 
18:54 (11:54) Lockloss – commissioning
19:14 (12:14) IFO locked at DC_READOUT
19:25 (12:25) Kyle – Going to Mid-Y to look for rigging
20:00 (13:00) Kyle – Back from Mid-Y
20:15 (13:15) Kyle – Going to Mid-X (WP #6000)
20:24 (13:24) Lockloss – commissioning
20:46 (13:46) IFO locked at DC_READOUT
20:49 (13:49) Betsy – Going to Mid-Y
21:16 (14:16) Lockloss – commissioning
21:36 (14:36) IFO locked at DC_READOUT
21:45 (14:45) Betsy – Back from Mid-Y
21:50 (14:50) Kyle – Back from Mid-Y
23:00 (16:00) Turn over to Nutsinee
 

End of Shift Summary:

Title: 07/15/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
Support: Keita, Stefan, Kiwamu,        
Incoming Operator: Nutsinee 

Shift Detail Summary: IFO locked at DC_READOUT, at 2W. Locking went relative well today. Had the IFO to NOMINAL_LOW_NOISE at 24.9Ws. Commissioners working on system. Rode out a 5.1mag EQ with no problems noted in the IFO operation.  

Kyle, Gerardo 

Used overhead crane to move EH2600 vacuum pumps from the elevated BT slab to the VEA floor -> Had rearranged pallets of HEPI actuators yesterday so as to create floor space to position (1) ea. EDP200 and (3) ea. EH2600 vacuum pumps adjacent to each other and near the 480 and 208 power receptacles, chilled water connections and LN2 boil-off vapor line.  Now I will be able to run these pumps periodically which will extend there useful life while in storage.

1235 - 1255 hrs. local -> To and from Y-mid 

Opened exhaust check valve bypass valve, opened LLCV bypass valve 1/2 turn -> LN2 at exhaust in 1 minute -> Restored valve configuration to as found.  

Next CP3 overfill to be Monday, July 18th.  

While Sheila was exploring the input alignment my moving PR3 and letting the initial alignment follow the beam, I recorded the required drive vector for PR3, PR2 and IM4, in both pitch and yaw.

This combination of alignment sliders keeps the spot positions on PR3 and IM4 the same, but moves the spot on PR2 (and therefore somewhat on PRM).

The matrix to convert PR3 alignment slider counts into corresponding alignment slider counts of PR2 and IM4 is
pitPR3toPR2=-9.2;
yawPR3toPR2=+9.2;
pitPR3toIM4=56;
yawPR3toIM4=11;
 

The attached script continuosly reads PR3 slider values and updates PR2 and IM4 slider values, walking the beam on PR2 only.

The script still doesn't have the PRM matrix elements - we will have to addd this in DRMI or full lock.

=========================================================================

Also updated the script to include PRM. This was done in the PRM align state.

pitPR3toPR2=-9.2;
yawPR3toPR2=+9.2;
pitPR3toIM4=56;
yawPR3toIM4=11;
pitPR3toPRM=1.5;
yawPR3toPRM=2.2;
 

Note that this should work in-lock once the PRC1 pointing loop is off (despite the fact that PR3 is WFS controlled).

Last night I took a bunch of pictures using PCal EX and EY camera to check the large angle scattering at 20W.

This morning, while I was taking pictures while IFO was unlocked to capture images without 1064 light, EX worked fine but EY stopped working after 10 or 11 pictures. Camera control software stopped responding, I cannot trigger shutter, see the live view, see the camera settings, really nothing.

Rebooting the camera, the camera interface and h1pcaly multiple times didn't help.

The other day when verifying rack layout Filiberto felt like something was wrong.  Upon further reflection he came to me this morning thinking he saw the HV shutter drive off.  No readbacks on the lcd screen.  I went out on the floor this morning and sure enough the +-15VDC switch was in the off position.  I turned it on and knocked the IFO out of lock.  At this time I am not sure how long it has been off (will run Dataviewer on a channel.) or why but will investigate.  When we work on this chamber for vacuum reasons we switch off the High Voltage supply so no one should have shut this unit off.   Investigation will continue to see how long we have been running in this state.

So the ITMX did not break lock on this smaller EQ.  Attached are the ISI T240 local channels--a couple hours around the EQ, for both ITMY & X.  Differences in the responses at these inloop T240s for these minute trends is uninformative so don't bother looking.  It is cool that the onboard vertical T240s shows the EQ shape better than the ground STS; related to the sensor correction?  The two ITMs respond ~the same in the regard.  When I compare the ITMs during the larger EQ Wednesday when the ITMX tripped, the response appears similar before the trip in the local basis from this vantage point.  Again, I attach the trends I've looked at but I think zooming in, the frequency space and cartesian basis is next.

The old geophysicist in me believes the trip is occurring with the earlier arriving s-wave, not the large amplitude surface waves.

Subsystems report all is working as expected, at this time.

Commissioning will be focusing on: 
	- Understanding the recycling gain loss
	- Lowering noise in the system
	- Improving the reliability of the IFO	 

As Jenne wrote, it does look like POP90 should be a god signal to use for an SRM dither lock, but somehow POP90 is not actually going to the ADS input matrix despite what the medm screens say, and what my old alog says.   I wonder if I frogot to check something into the svn after doing the model restart and someone reverted to the old version for some reason? 

Anyway, it seems worth getting the model with OPO90 in ADS back since a dither using POP90 might be an easy way to get SRM alignment under control now that the PD is no longer saturated.  Tonight it looked like the bounce mode rings up when SRM is misaligned, which makes sense if the SRM alignment causes SRC detuning and changes the DARM gain, as people have suggested. 

Sheila, Kiwamu,

Tonight, we continued working on searching for the missing recycling gain. We opened up PRC1 (which uses POP_A_QPD and feeds it back to PRM) and moved PRM manually to study the effect of the spot position on PR2. This seems to work well and we were able to get back to a high recycling gain of about 34 when PSL was 25 W. The attached shows the time series of us moving PRM in pitch toward the negative side by about 90 urad. The first drop in the power recycling gain is caused by the power-up from 2 to 25 W. We had to move SRM by hand in order not to loose too much sideband build up in SRC. Our alignment action seems to pull the common soft (or something similar) to one direction in which all the test masses goes to negative pitch values (see the second attached). Therefore, as we were in O1, at this power level, the recycling gain can be still found under some alignment land. We did not try this test at a higher PSL power.

Also, we have noticed at some point that some segments of the POP QPDs already used up the half of the ADC range at 25 W. So we decreased the whitening gains to 0 dB (which were 6 dB before). Sheila changed the guardian accordingly so that it maintains the 0 dB gain as a nominal setting. Also when we had a good recycling gain with this alignment, the beams on both POP QPDs were almost falling off of the photodiodes

Weigang Liu tried folding DARM and selected magnetometer channels during the three days of ER9 (UTC days)
with results posted here:  https://ldas-jobs.ligo.caltech.edu/~weigang.liu/advancedLIGO_3/ER9/files/ER9_magnetometers_and_strain_list.html,
where DARM folding focused on the 10-50 Hz band, and the magnetometer folding was low-pass
below 50 Hz, choices motivated by O1 experience.

As expected, the magnetometer channels still exhibit a variety of pathologies with 2-second periodicity,
but the elevated low-frequency noise in DARM make it hard to see this 2-second contamination in that channel
with this method. Attached are a few sample magnetometer fold summaries over the three days.

Quick Summary: We stay at relatively low power because ITM PI damping modules are not ready.

(All time in UTC)

23:45 SUSPI model restart

00:45 DAQ restart

1:47 Kiwamu to the floor aligning REFL camera

2:35 Kiwamu out

2:45 Kiwamu request for higher power. Going to 30W.

The shot noise level from last night seems higher (worse) than the O1 level by 6%. Here is the spectrum:

You can see that the red trace (which is the one from the last night) is slightly higher than the (post-) O1 spectrum. The 6% increment was estimated by dividing the two spectra for frequencies above 1200 Hz and taking a median of it.

*track AAA: PSL
- fix FSS re-locking problem

*track A: missing RG gain:
- PR2 spot position during alignment
- Add digital camera of BS
- arm optics camera defocus & power monitor
- *** fix the 2x omega diodes for SB recycling gain readout
   - check broadband mod of 2w PDs (POB and AS)
   - new lens in front of POB_B

*track B: noise commissioning?
 - shot noise scaling?
  - check calibration
  - try for 50W stable. Serious trouble with PI?
  - pick operating point, then now-noise commissioning
  - reduce RF45
  - Aux length show exess noise - fix it!

Nutsinee, Sheila

There is something wrong with the REFL and POP cameras, we see no image from them although we shoudl be seeing something on REFL. 

The CW injection amptlitude, as measured at the HARDWARE_OUT, appears to have changed on restart May 12. So far, I have not been able to trace down the problem, and conlog is currently down so I cannot see a history of chagnes in the HARDWARE_OUT bank.

Figure 1 observations (10 minute trend of HARDWARE_OUT):

• Near the end of O1, the peak CW injection amplitude is ~1700
• On restart, May 12, the peak CW injection amplitude is ~780
• On May 26, when Keith Riles and I changed the CW injections to use the first attempt at a new actuation function, the amplitude of the injections drops to ~650 because the new actuation function is different than the old inverse actuation function (this might change if Keith restarts the CW injections with the revised filter, see LHO aLOG 27539)

Figure 2 observations (10 minute trend of CW_OUT):

• On restart, May 12, the peak CW injections is the same as at the end of O1, ~7.5e-23
• After changing to the actuation function method, the amplitude changes to ~650 (off scale on figure 2)

Need conlog to investigate further.