It appears that the AIP for BSC8 has failed, we will investigate its status next Tuesday.

As requested by Robert Schofield, I have dialed back the supply fan air flows in the LVEA to ~ 10,000 CFM per fan and the End Stations to ~ 9000 CFM per fan.  

Currently there are 3 fans running in the LVEA, SF 2,3,&4. AHU-3 has both SF-1 and 2 running at ~9000 CFM. Each end station has only 1 fan running at the time.

In addition to dialing the fan flows down, Robert also requested that the frequency of all the chilled water pumps on site be dialed back to 45 Hz. I was able to travel to both end stations since we were not in observation mode earlier this morning and those pumps have been set at 45 Hz. The corner station chilled water pump was previously set at 45 Hz.

We will attempt to maintain these parameters as long as the VEA temperatures remain stable. 

H1 State:  Commissioning

Summary:

- IFO out of lock when I arrived, minor tweaks to return to Low Noise, alogged earlier

- Brief (3 minute) observe lock

- Relocking went smoothly

- IFO returned to Observe

- Maintenance started at 15:02UTC - JeffK working on ETMY ESD drive

To Do: angle to length measurement 

I did not do the angle to length measurement before going back to Observe, so it's planned for this morning after JeffK is done, and before he needs to break the lock.

J. Kissel

We're taking the IFO out of observation intent and beginning measurement prep for flipping the H1 ETMY bias sign. Stay tuned for detail aLOGs.

Called LLO and their GraceDB is now working, so they got the alarm.

OMC-DCPD_SUM_OUT goes first

First plot shows the glitch, and the lock survives a short time.

Second plot is the lock loss, and H1:ASC-AS_A_DC_SUM_OUT goes first.

TITLE:  10/14 EVE Shift:  23:00-07:00UTC (16:00-00:00PDT), all times posted in UTC     

STATE of H1:  H1 was down due to EY temperature variations & passed on to Cheryl to take over.

Incoming Operator:  Cheryl

Support:  Sheila was consulted over the phone

Quick Summary:  Mostly decent shift except for a lockloss toward the end of the shift which is most likely due to temperature variations at EY (see John's alog).  I handed over H1 to Cheryl as it was on its way to locking DRMI (no initial alignment was undertaken, only ETMy & TMSy were moved to restore H1 to locking).

Shift Activities:

• 23:58 Gerardo back from Ymid for leak checking prototype work
• 2:00 -3:05-ish  Robert & PEM non-Injections
• 5:04:41 - 5:12:29 "EY temperature is high" verbal alarming every 3-sec.  This started as I was on the phone with John as he was switching chillers and starting to cool things off.
• 5:38 Lockloss.  Most likely due to EY temperature variations.  OMC watchdog was tripped and had to be reset.

Both lock loss plots show H1:OMC-DCPD_SUM_OUT taking a sudden drop before any other channel shows a glitch.

Title: Owl Shift Transition Alog, Owl Shift 07:00-15:00UTC (00:00-08:00PT)

H1 State: Has relocked and made it to Low Noise and Observe, but only lasted 2-3 minutes - Relocked and back in Observe

Outgoing Operator: Corey

Help from: Sheila, Kiwamu

Details:

For the first lock, my interventions:

- I tweaked TMSY to raise the ALS arm power from 0.8 to 1.01

- I tweaked BS to lock DRMI, and then again after DRMI locked in order to get WFS to engage

- IFO went to Low Noise after that without issue

07:34:04UTC - IFO in Observe

07:37:06UTC - lock loss

For the second lock, my interventions:

- I tweaked BS after DRMI locked before WFS engaged

- IFO went to Low Noise after that without issue

08:06:14UTC - IFO in Observe

Issues?

08:07:53UTC - ETMY saturation

08:16UTC - Currently: IFO in Observe and range is 75Mpc

H1 dropped out of lock for no obvious reason, although when it came back, the Yarm looked fairly misaligned.  (so assuming the temperature excursion at EY was an issue).

Adjusted ETMy alignment for Locking Arms Green.  I was only able to get up to about 0.83.  And then at this point, I was stuck.  ISC LOCK had the user message:  "Waiting for arms to settle".  I would also get a flash of a message for ALS COMM of:  "COMM PLL or IMC not ready for handoff".  Haven't found anything in our Troubleshooting wiki or in Sheila's Operator training document.  ALOG searches are a pain and don't yield anything useful.  

Have left a voicemail with Kiwamu (On Call).  

I don't want to do an Initial Alignment because I don't know whether it's needed and would like to address this ALS issue first.

I noticed that the End Y temperature was not recoverling after Robert's HVAC shutdowns. Since it appears the chiller was not working correctly I have started the other one. Water temps are now falling. For the record I turned off Chiller 2 and turned on Chiller 1.This is done indirectly by turning the chiller's water pump off or on.We do not control the chiller remotely. There may be some overshoot on the VEA temperature as it corrects - so don't be surprised if it gets cold before it comes back to normal.

Tamper injections showed some upconversion from the tens of Hz region into the region above 60 Hz. The HVAC makes noise in this region so I did the test I had done in iLIGO, I shut down all turbines and chiller pad equipment on the entire site. This increased the range by almost 5 Mpc (see figure - the 3 range peaks are during the shutoff periods below).

Checks:

1) make sure all VFDs are running at 45 or less

2) if possible use only 2 turbines for the LVEA

We did not drop out of science mode but here are the times of the changes (Oct. 15 UTC):

2:05:00 shutdown started, 2:08:00 shutdown complete

2:18:00 startup started, 2:21:30 startup complete

2:31:00 shutdown started, 2:37:00 shutdown complete

2:47:00 startup started, 2:51:00 startup completed

3:01:00 shutdown started, 3:03:30 shutdown complete

3:13:30 startup started, 3:17:00 startup complete

The first attached plot (H1L1DARMresidual.pdf) shows the residual DARM spectrum for H1 and L1, from a recent coincident lock stretch (9-10-2015, starting 16:15:00 UTC). I used the CAL-DELTAL_RESIDUAL channels, and undid the digital whitening to get the channels calibrated in meters at all frequencies. The residual  and external DARM rms values are:

The 'external DARM' is the open loop DARM level (or DARM correction signal), integrated down to 0.05 Hz. The second attached plot (H1L1extDARMcomparison.pdf) shows the external DARM spectra; the higher rms for H1 is mainly due to a higher microseism.

Some things to note:

• L1's residual DARM is 6x smaller than H1, due to more suppression in the 2-5 Hz region. As the 2nd plot shows, there is more DARM excitation in this region on H1 than L1.
• The DARM DC offset for both interferometers is 10 pm, so the residual DARM represents a relative fluctuation of the detected power or photocurrent of 0.1% for L1, 0.6% for H1.
• The violin mode fundamentals are much lower in H1 than L1 - by around 3 orders of magnitude! This is because for H1 the violin mode active damping is left ON during low noise mode, whereas for L1 I believe it is turned OFF. However, this also means that the H1 front end calibration is not accounting for these damping paths.

The 3rd attached plot (H1L1DARMcomparison.pdf) shows the two calibrated DARM spectra (external/open loop) in the band from 20-100 Hz. This plot shows that H1 and L1 are very similar in this band where the noise is unexplained. One suspect for the unexplained noise could be some non-linearity or upconversion in the photodetection. However, since the residual rms fluctuations are 6x higher on H1 than L1, and yet their noise spectra are almost indentical in the 20-100 Hz band, this seems to be ruled out - or at least not supported by this look at the data. More direct tests could (and should) be done, by e.g. changing the DARM DC offset, or intentionally increasing the residual DARM to see if there is an effect in the excess noise band.