I was informed that the laser had tripped this morning.  Not sure exactly why the laser tripped as TwinCAT indicated
that the EPICS alarm was triggered.  At first glance it looks like the flow in head 3 caused the trip.  It reached
the trip value (0.4 lpm) roughly 2 seconds before heads 1 and 2.

    Attached are other trends of the laser power(s) versus the flow rate in head 3.  There is some evidence to
suggest that the NPRO might have tripped first, triggering the power watchdog for the front end (mis-named
Head2NPROa.png).

Summary:

Average range: 70 Mpc

Duty Cycle: 35% (commissioning activities reduced observing time)

1080Hz glitching continuing

Mysterious noise at 10-30Hz for ~2 hours on Tuesday (22nd)

Hardware injections during observing time on Wednesday (1 CBC, 10 detchar safety injections)

Full DQ Shift report: https://wiki.ligo.org/DetChar/DataQuality/DQShiftH120161121

Added error channels to help address issue reported in alogs 31910 and 31912. Also added all pressure gauges and updated guidance text.

Completes WP 6358.

Hoping for a light Maintenance (since many activities done yesterday) & aiming for ending at noon.  Cheryl handed over a locked H1 & it stayed locked for quite a while into Maintenance before dropping out....

H1 PSL appeared to trip (causing lockloss).  Peter & Jeff B addressed and are looking into why it dropped out.

I have added MEDM overview screens for H1 SUS ETMX, ETMY to the CDS web screen shots pages. 

This morning when the interferometer was down, I went to the ISCT6 table and removed the temporary digital camera or CAM17 (that was for the SRC Gouy phase measurement, see for example 29389). The beam for this camera is currently dumped by an additional razor blade dump on the table. The ethernet cable was re-routed and plugged to the OMCR camera which is the nominal cabling configuration. Additionally, I have left the base plate for the camera untouched in case we want to revisit the same measurement.

State of H1: locked in NLN in Observe

Commissioners: Sheila, Jenne (early in the shift)

Activities:

• Initial Alignment
• locked in DC Readout
• damping Bounce, Roll, and Violins
• lockloss before Noise Tunings
• relocked
• back to DC Readout
• some damping
• on to SRM_ASC_HIGH_POWER
• Noise Tunings by hand, line by line (see previous alog)
• Manually to NLN
• Manually set IMC_LOCK to ISS_DC_COUPLED
• Observe
• had to change phase on PI mode 28, kept H1 in Observe (see previous alog)

Violin Mode Damping:

• ITMX violin mode1 likes +60deg in phase, not in quardian

• 15:20UTC (707:20PT) Vendor #1 arrives: Paradice Water

Noise Tunings:

• I took snapshots of my guardian terminal and another therminal where I executed the command "date" after each Noise Tunings command, however I started that about command 12, so guardian commands and data commands match if you start at the end of the files and go backwards

a2l:

• started at: Tue Nov 29 06:02:59 PST 2016, 14:02:59UTC
• ended at: Tue Nov 29 06:07:49 PST 2016, 14:07:49UTC

Observe:

• H1 in Observe, on hold, IMC ISS is not decoupled

Because we are probably not going to be able to close the pop beam diverter right away, I removed it from the CLOSE beam diverters state and added this state back into the normal path to nominal low noise, so that at least the AS and REFL beam diverters will be nominally closed for the start of the run. 

State of H1: Initial Alignment just completed, working to lock full IFO

Commissioners: Jenne, Sheila

Activities:

• I started my shift with H1 in recovery from Monday Maintenance
• Sheila and Jenne finished their IMC work
• I did an Initial Alignment
• Currently at Find IR in locking the full IFO

Kiwamu and I installed the new piezo mirror mount. The frequency of the peak in quad diodes increased and was damped as expected, but the final arbitrator is DARM and we havent locked yet. I will put in a log with details when we do.

Jenne, Sheila Keita

We had another instance of a jump in POP90, in which both the I and Q phases increased. We think this is a problem with the readback, similar to what is described in 31181.  

We were acquiring lock, and had no ASC running on the SRC.  We looked at witness sensors for all the interferometer optics, and it looks like none of them moved at the time.  We also don't see changes in other RF sensors, like AS36, AS90, or POP18. We looked at both quadratures of POP90 before rotation and it seems to have both a phase shift and a 3.5 dB increase in the sum of I+Q. The RFmon and LO mon on the demod don't have any jumps nearly that large, so if it is a problem in the demod it is probably downstream of the directional coupler for the RFmon. 

This seems not to be the same as the jumps in SRC alingment that started after last tuesday's maintence, (31804 31865 and other alogs), but since the symptom is very similar it would make debugging the other problem easier if this issue could be fixed. Since we use POP90 for a dither lock of the SRM angle durring lock acquisition, this can cause a lockloss if it happens while we are trying to lock. 

Robert, Kiwamu,

This is a summary of the recovery of the IMC alignment after the PSL PZT mirror mount swap today (for which I think Robert will make a separate report).

Synopsis-

IMC seems to have shifted its waist location horizontally by 0.25 mm based on the change seen by the suspension witness sensors. This apparently was large enough to reduce the amount of light at IMC-TRANS by a factor of two presumably due to a worse in-vac clipping in HAM2. Nevertheless, as of now, we seem to be able to lock the interferometer on DC readout without new issues.

Recovery process-

We temporarily placed an iris after the top periscope mirror and before the beam tubing. After the swap, we checked two existing irises that had been on the table and the new one at the top of the periscope to coarsely recover the alignment. Then checking the spot on the PSL wall coming out from the light pipe between the PSL and HAM1, we did a fine alignment. This was good enough to put us back to a position where we see the main light on IMC REFL camera. A final alignment was then done by engaging IMC ASC which automatically servoed the alignment to an optimum. The temporary iris was removed before we left the PSL.

After the successful lock of IMC and successful engagement of IMC ASC, we noticed that the IMC TRANS is smaller by a factor of two. This seems to be due to a slight change in the horizontal direction in the uncontrolled degree of freedom. Here is a table listing several changes in some relevant sensors.

As shown above, the only appreciable change is that in DOF2 of IMC YAW (highlighted by red texts). Using Kawazoe's formula (P1000135), one can find that this amounts to a lateral shift of the spot position by 0.25 mm toward HAM3 or away from PSL. [EDIT] Keita pointed out that the direction of the move that I initially reported was wrong. So the correct statement is that the beam shifted by 0.25 mm toward the PSL or away from HAM3.
 

Things we didn't optimize-

• MC3 spot position (or IM4 spot position) in yaw
  • We are not sure how this is going to change DARM noise.
• IMC WFS centering
  • They are not centered any more as a consequence of today's activity. One can re-center them by picomotors if necessary.

Following up on the DetChar report of ETMx oplev laser glitching causing problems, I confirmed (using the DetChar summary pages) that the laser was indeed showing signs of glitching.  I also noticed the ETMy laser was also showing signs of glitching.  I increased the power for both lasers to hopefully get them into a thermal state they are happy with.  I used the Current Monitor (outputs a voltage to monitor the current delivered to the laser diode) port on the back of each laser as a guide.  The changes were:

• ETMx
  • Current Monitor Before: 0.814 V
  • Current Monitor After: 0.830 V
• ETMy
  • Current Monitor Before: 0.861 V
  • Current Monitor After: 0.880 V

Seeing as I had to open the cooler for both lasers they will both need 4-6 hours to return to thermal equilibrium.  At that point a determination can be made as to whether or not this helped at all.  The attached 3 hour trend of the oplev SUM for both optical levers gives hope; after the power increase the SUM signal is quieter for both oplevs.  I will leave WP 6348 open for now as more adjustment may be necessary to fix the glitching.

Keita, Sheila

At 11 am pacific time (19:00 UTC Nov 22nd), there was a sudden shift in alignment in the SRC that caused bad noise in DARM. The first attached screenshot shows the noise in DARM changing.

At this time, there is a shift in the alingment of SRM and SR2 in both pit and yaw, and other interferometer optics don't move significantly.  The OMs and OMC suspensions move as well, but that appears to be a result of the feedback. There is also an increase in POP90, a small drop in AS_A DC, and a small increase in AS90.  The signals on all 4 quadrants of ASA36 I change (the in loop signal, where we are using a funny matrix to take care of an offset).  On AS36 B, we see pitch signals, but not much signal in yaw. Also, the RF levels on all quadrants of AS36 WFS change by 5 to 8dB, which could be the result of the alignment shift.  

We looked at conlog for any changes at the time, there were only PI settings changing, we don't think there was anyone in the LVEA or CER at the time.  

The most obvious sign for an operator that this has happened would be that POP90 jumps suddenly in the middle of a lock stretch.  If this happens again, people could (go out of observe) open the SRC1 ASC loops by ramping the gains to zero, then try moving SRM to bring POP90 back to a normal level.