Jim W. pointed out that there was an oscillation in the control loops. ETMX ISI seemed to be moving quite a bit as well. This grew to the point that we knew we were about to lose lock. Nutsinee suggested an increase in DHARD gain by 3dB (based on a previous experience she had, and advice from Jenne and Sheila then). I changed their gain and after about 10 seconds or so it dropped.

The ETMX ISI is still has large movement in it, and not showing signs of relaxing at all. The control room is working on it, we will try to relock again as soon as we can.

came in today to find ISI HAM2,3 models each have a single CRC DAQ error as reported by the data concentrator (this is calculated 16 times a second). I found that these numbers are not trended anywhere, so I'll open an ECR to add them to the DAQ. I know that all the CRCs were zero when I left at 18:00 last night.

Note to operators, if you see CRC errors on the new CDS O1 Detail screen not related to restarts please alog this. TJ tested the new "!DAQ Clear Accumulated CRC" button when H1 was not in observation mode to clear them.

Observing at 78MPc.

Environment:

• Winds < 15mph
• Seismic: 0.03-0.1Hz = 0.04 um/s, 0.1-0.3Hz = 0.8 um/s
• Outside Temp: 56.4F/13.6C
• Inside temps: Good

Lockloss @ 19:22

LLO is down with some "high" winds. Chris Biwer will run a swept sine while there is an opportunity.

Beginning swept-sine test for CAL-INJ while LLO is down.

Attached is a summary of PEM injections, with summary plots for both sites, estimates of environmental contributions to DARM and calibrated coupling factors. These are also useful for calculating the SNR in DARM from the SNR in the PEM channel, determining coupling sites for environmental events in DARM, and for comparing coupling between LHO and LLO. Links to the individual reports follow.

Magnetic

LHO: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=21272

LLO: https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=20599

RF

LHO: single f’s https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=23252

         sweep https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=22968

LLO: preliminary single f’s https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=20599

Vibration

LHO: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=22797

LLO: https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=22463

Site activities

LHO: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=21272

LLO: https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=20599

Robert, Anamaria

Travis brought it all the way up, We are now in Observing. Winds <15mph, Seismic: 0.03-0.1Hz = 0.02um/s, 0.1-0.3 = 0.8um/s. The PSL power was 21.8W a second ago, but seems to have come up to 22.1W since I started writing this.  LLO is also up and Observing.

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

• STATE Of H1: Almost locked

• OUTGOING OPERATOR: Travis

• QUICK SUMMARY: Winds and seimic kept the previsou shifts down, but seemed to have died down 30min ago so Travis has the IFO almost all the way locked for me.

Title: 11/11 Owl Shift 7:00-15:00 UTC (0:00-8:00 PST).  All times in UTC.

State of H1: Lock acquisition

Shift Summary:  Wind dropped like a rock at ~15:00 UTC.  I began an initial alignment since it had been down for 4 hours and had been through a windstorm.  Microseism is trending up but still at a manageable level. 

Incoming operator: TJ

Activity log:

8:33 GRB alert, LLO was down

12:03 Adjusted X and Y arm ALS fiber polarization

15:42 Chris to X arm for beam tube sealing

Still down after the lockloss earlier due to high winds.  Winds are in the 30s with gusts to over 40 mph, and the forecast predicts it won't get better for the rest of the day.  But who believes the weathermen anyways?? (According to the NWS, they are off by a factor of 2 in their prediction at the moment, however in the wrong direction for GW science.  It is supposed to be 15 mph with gusts to 20.)

I had to call Keita at 4am PST to walk me through an ALS fiber polarization adjustment since I had never done one and could not find a procedure to do so (it is on my list to add to the OPS Wiki).  The wind did its typical thing where it calms just enough to lull you into the sense that you should begin locking again before it picks back up.  Sorry Keita, you should sleep in this morning or get a nice breakfast or something.

Lockloss, most likely due to winds which are gusting to over 50 mph.

Activity Log: All Times in UTC (PT)

00:00 (16:00) Take over from TJ
02:40 (18:40) First of four large (mag 6.9 to 4.9) EQs in Chile. All four arrived within 30 minutes.
05:00 (21:00) Start initial alignment
06:19 (22:19) IFO locked at NOMINAL_LOW_NOISE, 22.1w, 78Mpc
06:24 (22:24) Cleared SDF and set intent bit to Observing
06:56 (22:56) Lockloss – mag 5.2 EQ on Mid-Pacific Ridge
07:30 (23:30) Relocked at NOMINAL_LOW_NOISE, 22.2w, 78mpc
	      No SDF differences flagged – Set Intent bit to Observing
08:00 (00:00) Hand off to Travis


End of Shift Summary:

Title: 11/10/2015, Evening Shift 00:00 – 08:00 (16:00 – 00:00) All times in UTC (PT)

Support: Keita, Betsy, Hugh, Vern, Marissa 

Incoming Operator: Travis

Shift Summary: Had problems locking the ALS green, mostly in X. Keita found the BSC-9 ISI had a large swing on the X platform location. (See #23293). The motion slowed down, and I was able to realign the ALS green for both arms. Tried relocking. Made it to DARM_1F before 4 large EQs hit Chile. Seismic motion is very high right now (See #23296). Waiting for things to settle and will try relocking. 

After seismic activities settled down to below 0.1 um/s and microseism dropped to 0.3 – 0.2 um/s, ran initial alignment. The IFO was locked at NOMINAL_LOW_NOISE. Cleared up several SDF issues, and set the intent bit Observing. Wind at the CS is a moderate breeze (13 – 18 mph) and light to gentle (4 – 12) at the ends and mids. 

Lockloss due to Mid-Pacific Ridge Earthquake. Seismic activity has rung up a bit, but is quickly coming down. Microseism did not change from 0.3 um/s. Wind is up to a fresh breeze (19 – 24 mph) in the CS. The wind at the ends and mids is still light to gentle breeze (4 – 12 mph). Will attempt to relock without doing an initial alignment.

IFO relocked easily without the need for a realignment. Back to Observing
   

 

This entry follows upon the entry 23167 where the frequency of the 3rd and 4th harmonic for the QUAD suspensions violin modes were identified. This entry is also complementary to Evan Hall's entry 22847 where similar Q's were measured with a different technique.

In this analysis, a line tracker (iWave) was applied over each of the identified 3rd and 4th harmonic frequencies (23167) on 21 hours of data during which the detector was continuously in Observing mode and with the damping filters turned off, data analysed started from 2015-10-21 21:30:00. The channel I used is H1:OMC-DCPD_SUM_OUT_DQ downsampled to 8192Hz in order to be able to handle the considerable ammount of data.

The line tracker was set to lock, on an automated way, to each of the monitored frequencies of interest. The tracker provides the frequency value which it is following and the amplitude of that frequency as a function of time. This information is provided in real time with the data being analysed. Although I automated the process the line tracker could not always lock to the mode of interest, in a few cases it locked to the wrong mode of higher amplitude and/or was not able to separate modes of high amplitude and close proximity. Therefore a targetted run had to follow the automated one.

The result of the analysis is summarised on the attached 'png' plots which shows; in each column the mode monitored with the top plot being the frequency tracked as a function of time and the bottom plot the 'log(Amplitude)' (Napierian or natural logarithm of the mode's amplitude). The red dashed lines are respectively the median of the tracked frequency and the fitted first order polynomial to the 'log' of the mode's ringdown.

Notice that monitoring 21 hours at 8192Hz resolution of 50 modes provide a huge ammount of data so here I only present a summary of the results, and this is also the reason why the plots shown are .png files.

The first order polynomial fitting of the ringdown was done using Matlab's 'polyfit' function which implements a least-squares minimization fitting. This function also provides an estimate of the covariance matrix of the fitted coeficients which is used to calculate the standard error or variance of the estimated coeficients for the linear fit of the log(Amp) ringdown. In particular only the slope of the fitted line is used to estimate Q = Pi * f0 / abs(slope_fit), where f0 is the median of the frequency tracked. The median of the tracked frequency has an observed uncertainty smaller than 1mHz which makes the Q relative uncertainty to be dominated by the slope fitting uncertainty as given by the covariance matrix of the fitted coefficients. Therefore the reported error on Q will be given by the uncertainty of the slope of the fit as:

(Delta(Q) / Q)^2 = (Delta(slope_fit) / abs(slope_fit))^2

Next I summarise the results in 4 columns (also on attached .txt files labelled 'Q_results_3Harm_1stFreq_2ndQ_3rdDeltaQ_4thEHresults' and ''Q_results_4Harm_1stFreq_2ndQ_3rdDeltaQ_4thEHresults); first is the mode frequency, second is my estimated Q, third is the estimated Q error, and 4th is Evan Hall's results from 22847 for comparison:

Mode frequency (Hz)          Q (line tracker)                Delta(Q)                Q_from_22847

1.0e+09 *
   0.000001456177151   1.055261277139490   0.000021679047341   1.060000000000000
   0.000001456842619   1.011674961643711   0.000024977780728   1.020000000000000
   0.000001461409317   0.547106388691582   0.000007012695846   0.550000000000000
   0.000001461732469   1.000243995219630   0.000121822842175   1.000000000000000
   0.000001461859533   0.673721968942594   0.000056781365996   0.644000000000000
   0.000001462031866   1.015448724742734   0.000039055044799   1.030000000000000
   0.000001462313302   1.109264503070151   0.000020406518349   1.120000000000000
   0.000001462596624   0.879503445780186   0.000090574514768   0.921000000000000
   0.000001463096689   0.881010088452959   0.000383879344618   0.995000000000000
   0.000001463100039   0.990987050813072   0.000431799209313                   0
   0.000001467475846   1.089361798635816   0.000107769329936   1.130000000000000
   0.000001467964869   0.979770107952095   0.000024671825593   1.000000000000000
   0.000001470380790   0.886560854120574   0.000042794470546   0.894000000000000
   0.000001470826225   1.046162403099169   0.000070957888675   1.040000000000000
   0.000001471928631   1.433692732321030   0.000246428147278   1.280000000000000
   0.000001472216373   1.036874013551553   0.000319968824557   1.070000000000000
   0.000001472450299   1.116249774693906   0.000012761989599   1.130000000000000
   0.000001474079863   1.178125176004288   0.000086507667346   1.170000000000000
   0.000001475097416   1.001120432026481   0.000377881305540   0.935000000000000
   0.000001475251394   1.148066981481587   0.000155330486516   1.160000000000000
   0.000001478169574   0.781717093501666   0.000095725814070   0.830000000000000
   0.000001482585386   0.865266831531971   0.000049369138115   0.879000000000000
   0.000001484077440   0.912365853159565   0.000100741959112   0.914000000000000
   0.000001484430000                                   0                                 0   0.796000000000000
   0.000001484525699   0.821953404180692   0.000053588794283   0.836000000000000
   0.000001484668763   1.396430023353472   0.000359948050123   1.270000000000000

   0.000001922925589   0.806732893457201   0.000050155023271   0.812000000000000
   0.000001923612098   0.904079503131098   0.000101465317927   0.856000000000000
   0.000001923854589   0.730146274074320   0.000057632970265   0.741000000000000
   0.000001923861257   1.045943198261562   0.000286910927180   1.000000000000000
   0.000001924673359   0.656777206317145   0.000037377872702   0.675000000000000
   0.000001924914736   0.822610665784300   0.000055143089987   0.845000000000000
   0.000001926240582   0.877913538609440   0.000041733066792   0.888000000000000
   0.000001927465534   1.193131464187697   0.000196087122798   1.080000000000000
   0.000001928461859   0.491982285283618   0.000060799517584                   0
   0.000001929312799   1.014511076625149   0.000491391979504   0.742000000000000
   0.000001931573475   0.770986524485489   0.000120874236513   0.778000000000000
   0.000001932139817   0.721080850064806   0.000077175334498   0.739000000000000
   0.000001932335653   0.723984558093199   0.000083370684684   0.713000000000000
   0.000001932612502   0.802178526483954   0.000016727734773   0.806000000000000
   0.000001940322842   0.727877169848855   0.000210139484624   0.778000000000000
   0.000001940663844   0.923330707711907   0.000027923601820   0.941000000000000
   0.000001941349656   0.922491569137019   0.000274707300452   0.906000000000000
   0.000001942174877   1.171274720414585   0.000377051759607   1.050000000000000
   0.000001942390477   1.094325186350570   0.000475289691312                   0
   0.000001943777687   0.914373092200222   0.000483429769721                   0
   0.000001946732789   0.732800137163962   0.000093031972218   0.677000000000000
   0.000001954459289   0.803950536039718   0.000153319383649                   0
   0.000001955921818   0.684755442755530   0.000143761779921                   0
   0.000001957335075   0.651607142944878   0.000091322052084                   0
   0.000001959023577   0.785016144699797   0.000093723756453                   0

NOTE: Although there are not big differences in results with entry 22847 for the 3rd harmonics, however some difference is observed on the Q's of 4th harmonics, also 7 more modes are reported here for the 4th harmonics.