NOISY SEISMIC:  This shift continues to have elevated wind (averaging about 25mph) and useism (Corner Station hovering at 1um/s).  Attached are screen shots of the useism, and the wind for the last 24hrs.  One can view the useism band here.

TCSX LASER BACK:  Nutsinee brought the TCSX laser back & that will probably take something on the order of an hour(s) to heat up ITMx.

INITIAL ALIGNMENT NOT POSSIBLE YET:  Also tried starting an initial alignment.  I was able to get the arms to lock up (Y-arm looked good & X-arm needed some ETMx tweaking), but they only stay locked on the order of seconds and then get bumped around by the wind and drop.  So this will make Initial Alignment tough:  Still too noisy for the arms.

I have all BSC ISIs on 45mHz Blends.

This is a continuation of the results reported in 23331 adding this time the Q measurements for the 2nd Harmonic of the violin modes for ITMX and ITMY suspensions. Based on the 10 hours of data from (UTC) 2015-11-04 06:35:00 to (UTC) 2015-11-04 16:15:00 when the damping filters for these harmonics were turned off.

I attach the spectrum of the 10 hours of data with resolution of 1mHz and 68 averages, in red are the peak frequencies identified here as 2nd harmonics for ITMX and ITMY and these are the ones I track here with a line tracker (iWave).

Attached are the summary plots for the line tracker locked modes; at the top is the frequency as a function of time and at the bottom is the Log of the amplitude as a function of time. A first order polynomial is fitted to Log(Amp) in order to obtain the Q of that mode.

In comparison with n 23331 this time we observe many more modes with a clear ringdown allowing for more accurate measurements of Q as shown next:

            Frequency                       Q                Delta_Q

   1.0e+09 *
   0.000000991746043   0.638343205424020   0.000149585967453
   0.000000991932780   0.988513060431184   0.000433659978759
   0.000000992424650                   0                   0
   0.000000992793647   1.544250594114285   0.000442769972986
   0.000000994277692   1.846260247611300   0.000357683597242
   0.000000994646171   1.429803598985770   0.001138277433661
   0.000000994733913                   0                   0
   0.000000994897934   1.363257521653677   0.000632572972344
   0.000000995365554   1.412623504284980   0.001169331947625
   0.000000995645184   1.427802427814187   0.000897711718659
   0.000000996250457                   0                   0
   0.000000996528556   1.051941151626503   0.000247088823712
   0.000000997717925                   0                   0
   0.000000997887934   1.367480640577778   0.000256968037986
   0.000000998664500                   0                   0
   0.000000998805575   1.414837156915169   0.000225767863446

useism is still hight 0.5-1.0 um/s & winds are still averaging over 20mph.

TCSX laser tripped this evening as well.  Nutsinee has been talking with Alastair & Mike about this.  I am going to go out on the floor with her as her "buddy" as she inspects and does work on table.  With this laser off, it takes an hour or two for the TCS to heat up ITMX once we get it back... so we'll be down for a while due to this (but we were already down due to obvious environmental issues.

While checking doors and turning off lights, I went ahead and topped off the Chiller.  I put in 170mL (NOTE:  Jeff topped it off yesterday to 250mL).

TITLE:  11/13 OWL Shift:  00:00-08:00UTC (16:00-00:00PDT), all times posted in UTC     

STATE of H1:  H1 is DOWN due to elevated winds & useism since last night's OWL shift.

Outgoing Operator:  TJ

Support:  

Quick Summary: 

Gusts up to 50+mph.  useism hovering around 0.7 um/s (must be atleast 0.5 to even think about locking...and this isn't even factoring wind.); useism has been at this value or higher for the last 22hrs!

While we are down, Nutsinee is doing Hartman Wavefront Sensor alignment out on the floor (TJ mentioned Landry approved this earlier).  I see that HAM2, HAM5, & HAM6 ISIs are in the DAMPED state.  Will transition back to ISOLATED when Nutsinee work complete.

• TITLE: 11/13 DAY Shift: 16:00-00:00UTC (08:00-16:00 PDT), all times posted in UTC"

• STATE Of H1: Down due to high wind, high useism, earthquake

• SHIFT SUMMARY: Down the whole time, the winds and seismic activity keeping us down
  

• INCOMING OPERATOR: Corey

• ACTIVITY LOG:

• 16:36 Gerardo, Jodi - To H2 enclosure
• 17:05 Chris - to Xarm
• 17:18 Gerardo, Jodi - back
• 19:24 Chris - To Xarm again
• 19:35 Peter King - to PSL Diode room to find part
• 19:45 Peter - out
• 20:10 Jodi - To Optics lab
• 21:20 Jodi - Out
• 21:41 WDs tripped: IMs, PR3, MC3, MC1, ITMX ISI. Jim was changing sensor correction.
• 21:52 Dave - To CER
• 23:10 Nutsine - To LVEA for HWS alignment.

I managed to get an initial alignment done when the winds were around 30mph, though it probably isn't a very good alignment because I could not let the WFS wait to converge too long or it would get knocked out of lock. After the IA, the winds have picked up to gusts of 50mph according to our Striptool. Keeping ALS locked is proving impossible.

The good news: useism may be trending down slightly. Maybe it's just an illusion from DMT, but I'd rather be optimistic.

model restarts logged for Thu 12/Nov/2015 No restarts reported

model restarts logged for Wed 11/Nov/2015 No restarts reported

Wanted to post some screenshots to show what we have going on.

1st attachment - Wind Striptool

2nd - NOAA Wave height

3rd - Seismic DMT in control room

• Title: 11/13 Day Shift: 16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC
  

• State of H1: Down due to high microseism and high wind
  

• Outgoing Operator: Cheryl
  

• Quick Summary: Microseism is at 1um/s, winds gusts up to 40mph

A large group of middle school students participated in a field trip at LHO on the morning of 11/12.  Arrival time at LSB = 9:00 AM.  Departure time = 11:30 AM.  Group size = ~100 middle school students; ~10 adults.  Vehicles at the LSB = ~3 school buses.  The group was in the control room near 11:15 AM.  

Title: Owl Shift  08:00-16:00UTC (00:00-08:00PT)

State of H1:  can lock arms in green, cannot go any further

Shift Summary: H1 has been unlocked all night due to high winds and useism.

Currently: No hope of locking even the X arm in IR (I tried, it's not yet possible because of the ground motion)

- useism is around 0.7

- winds are 0-30mph

- guardian state left on Locking Arms Green

With no hope of locking, Richard gave me to ok to head out a bit early.

Patrick is watching the Control Room/phones.

Three plots attached

Plot 1:  ETMY ISI right before lock loss.  Clear to see motion increasing, and Z positoin rings ups about 45 seconds before lockloss.

Plot 2: ETMY ISI after lock loss.  The ringing in the CPS_X sensor

- at 7:14UTC ISO RX output sees something and the signal grows to 4x it's previous size - red oval

- at 8:10UTC CPS X Location Mon rings up, Jeff and I disable FM8 Boost3, signal quiets around 8:55UTC

- later, with no locking, I disable and enable again to measure a power spectrum (X and Y)

Plot 3: power spectrum comparing ISO X in

--- 2:49UTC (ref6 ,7) - baseline

--- 7:50UTC (ref8, 9) - ISO RX has run up a bit, but ISO X isn't yet

--- 8:45UTC (ref10, 11) - Boost3 turned off on ISO X

--- 10:27UTC (ref22, 23) - as a test I turned off ISO Y Boost3, and yes, it's noticable (bottom plot)

--- 12:22UTC (ref24, 25) - current state, Boost3 filters have been back on since around 11UTC, winds are between 15mph and 40mph, useism is around 0.8 (slightly better than 1.5 hours ago)

Title: Owl Shift 08:00UTC-16:00UTC (midnight to 08:00AM PT)

State of H1: unlocked for 6+ hours due to useism and wind.

Details:

- max wind speed this shift 60mph

- windspeed sitewide about 2 hours ago across all wind stations was between 18mph and 45mph

Currently:

--- useism is around 0.9 and apears to be rising in the last hour

--- wind is between 5mph and 40mph across the site

--- winds at EY have just spiked to 45mph as I wrote this

Activity Log: All Times in UTC (PT)

00:00 (16:00) Take over from TJ
01:50 (17:50) Jeff – Add 250ml water to TCS-Y chiller. TCS-X OK
06:03 (22:03) Lockloss – Environmental, high winds and microseism.
07:15 (23:15) Put IFO into DOWN to wait for conditions to improve
08:00 (00:00) Turn over to Cheryl


End of Shift Summary:

Title: 11/12/2015, Evening Shift 00:00 – 08:00 (16:00 – 00:00) All times in UTC (PT)

Support: Jim W., Nutsinee,
 
Incoming Operator: Cheryl

Shift Summary: Lockloss at 06:03 (22:02) – Probably due to high winds (in the high 20s to mid 30s with gusts over 40mph) and increasing microseism (centered at 0.8um/s with high at plus 1.0um/s). Attempting to relock. 

The wind has dropped a bit, but microseism is increasing. Switched the ETM-X Y and ETM-Y X dof from Quite90 to 45mHz to see if this will help with locking. ETM ISI CPSs are not rung up.  

Relocking seldom making it past LOCKING_ALS and ETM-X ISI CPS starting to ring up. Put the IFO into a DOWN state and reset the ETM X & Y blends back to original settings. ETM-X ISI CPS has settled back down to a normal state. When wind and microseism calm down will work on relocking.  

GWINC quantum noise curve is replaced with dynamically-generated shot noise curve. Radiation pressure will be included later.

The null stream spectrum shows 8×10⁻⁸ mA/rtHz shot noise, which seems to imply 17 mA of dc photocurrent on the sum, rather than the expected 20 mA.

I took a quick look at the swept sine measurements Chris made earlier today, in order
to derive a transfer function from H1:CAL-INJ_CW_OUT to H1:GDS-CALIB_STRAIN,
using the same matlab script written recently to analyze L1 measurements>.

Attached are spectrograms of H1:CAL-INJ_CW_OUT and H1:GDS-CALIB_STRAIN for
the period of the measurements, along with the derived transfer function
(see LLO alog entry above for explanation of graphs). Although there is an
odd bump in magnitude response at 610 Hz (due to compensating for a notch 
at a BS 2nd violin harmonic?), things are otherwise smooth between 200 and 1400 Hz,
albeit with phase wrapping at a bit more than 1000 Hz. This measurement seems
at odds with Matt Pitkin's CW hardware injections recoveries (summary plot attached), as is
the case for the recent L1 measurements. 

On the one hand, one could wonder if perhaps the swept sine just isn't sampling the frequency range
finely enough to catch everything that affects the particular frequencies where CW injections
are made, especially given the complexity of the inverse actuation filter Jeff posted here. 

On the other hand, the swept sine points were chosen to coincide almost exactly with
CW injection frequencies (575 and 849 Hz) for which discrepancies between injection 
recovery and the transfer function measurements seem to occur. 

Matt has double-checked and triple-checked the phase definitions he uses in 
injection recovery. So the discrepancies in phase for pulsar 1 and 2 phase remain
mysteries (for both H1 and L1). 

As discussed elsewhere, these lingering discrepancies suggest (to me, anyway) that we 
should simplify CW injections either by using PCAL with its considerably simpler IAF
or by dispensing entirely with an IAF in the current ESD injection mode (i.e., rescale
each CW injection amplitude by the point value of the inverse of the measured
actuation function).

Figure 1 - Spectrogram of H1:CAL-INJ_CW_OUT
Figure 2 - Spectrogram of  H1:GDS-CALIB_STRAIN
Figure 3 - Derived transfer function from H1:CAL-INJ_CW_OUT tp H1:GDS-CALIB_STRAIN
Figure 4 - Summary of CW hardware injection recoveries

I have turned off the violin mode damping filters for IX and IY by zeroing their gains. Patrick accepted these into SDF so that we can go to observing.

This is meant to be temporary, i.e., for this one lock only.

The next time the interferometer comes into lock, the Guardian will turn on the normal violin mode damping settings. These settings will appear as SDF diffs (two on IX, and six on IY). These should be accepted into SDF.

We do not expect these modes to ring up during the course of the lock. However, if the mode height on the control room DARM spectrum around 500 Hz rises above 10⁻¹⁶ m/rtHz, the damping should be turned back on:

1. Make sure the ramp times for the damping filter modules are at least a few seconds (currently they seem to be set to 10 s).
2. The filters should already be configured to provide the right damping phase, so changing the filters should not be necessary.
3. Start typing in gain settings. Refer to the values listed below. If the violin mode amplitude is much much higher than usual (e.g., it's off the scale on the control room DARM spectrum), it is wise to start with a small gain (e.g, gain of ±1) in order to make sure the suspension drive does not saturate. Then you can increase the gain in several steps, until the nominal setting is achieved.

A screenshot of the nominal IY damping settings is attached (I didn't take one for IX).

ITMX:

• MODE3 gain: −100
• MODE6 gain: +200
• all others zero

ITMY

• MODE1 gain: −200
• MODE2 gain: −200
• MODE3 gain: +100
• MODE4 gain: −50
• MODE5 gain: +400
• MODE6 gain: +50
• all others zero