1/2 open LLCV bypass valve, and the exhaust bypass valve fully open.

Flow was noted after 20 seconds, closed LLCV valve, and 3 minutes later the exhaust bypass valve was closed.

Next over-fill on Thursday, March 3rd before 23:59 utc.

After a LN2 delivery to CP3, Kyle suggested to visit the Y-Mid station to see how CP3 was doing, there was LN2 being spilled out of the exhaust pipe.  At 22:23 utc I decreased the LLCV valve setting to 15%, previous setting was 18%.

Maintenance list in earlier alog.

DAC reboots by DaveB since that post.

Currently TCS is working with heating on ITMs.

Alignment and locking resume after their work.

(Chandra, Gerardo and Kyle)

Regenerated NEG pump with the aid of an aux cart.

Valved out NEG pump from X-End, then started regeneration of NEG pump ~19:00 utc.
2 hours later heating was complete, waited for temperature to drop down, valved in NEG pump to X-End volume at 21:45 utc and @ 92 deg C.

Finished adding Caps to the Negative regulator per latest dwg. Today we completed the ITMx,ITMy,BS, and all of Ham5 and Ham6 Suspensions.  Also verified and corrected were needed Ham2 optics.
This should stem any oscillations caused by the long cables from the SAT amp side.

IM2 signals changed behavior on 23 Feb around 19:00UTC.

Pitch and Yaw signals sent from about 1 count pp to 6 counts pp.

Looking at OSEM signals, UL and LL decreased in pp counts, UR remained about the same, and LR increased it's pp counts.

Plots attached: power spectrums look very similar to the "good" values, time series shows the OSEMs and the increased pitch and yaw signals.

Monday: Noise hunting (sort of)

Tuesday: ITM preloading, SRC work, get back to locking

Wednesday: WFS (morning) & noise hunting (later in the afternoon)

Thursday: Noise hunting (all day)

Nairwita and Jeff found yesterday that the foton file for HAM5 did not show the same controller that the seismic matlab commissioning scripts said were installed. The changes weren't huge (some very different low frequency gains, but only factors of a couple at a few hz), and are shown in the two attached plots. First figure is the old filters, second is the new filters. While everything was down this afternoon I've installed the Matlab filters. I don't expect any difference in the performance at HAM5, the diffrences are not huge, this was mostly a housekeeping task, to make offline modeling work easier. I still haven't figured out why the difference, but it would likely take digging through months of archived foton files. This also makes the controllers at HAM5 more similar to HAMs 4&6 over 1-10hz.

(Fil Keita Daniel)

OMC PZT dither: change cap for 1000 less analog gain. Issue 1208, ECR TBD. Done

OMC DCPD bias voltage: increase bypass caps on power supply. Issued 1207, ECR E1600061. Done

Cao, Nutsinee, Elli

We replaced the ITMX HWS SLED with a spare.

We remeasured power coming out of the SLEDs using an Ophir power meterhelp directly in front of the fiber.

The ITMX SLED power was 1.35mW (running at 98mA current)

The ITMY SLED power was 2.90mW (running at 103mA current.)

The SLED power channel H1:TCS-ITMX/Y_HWS_SLEDPOWERMON was recalibrated using new gains and dark offsets

H1:TCS-ITMY_HWS_SLEDPOWERMON=0.48*intput-0.0071

H1:TCS-ITMX_HWS_SLEDPOWERMON=1.089*input-0.154

Posted are the data from the 3IFO desiccant cabinet and the two dry storage boxes for February. Data shows no apparent problems.  

Site activities: some started before 16:00UTC (08:00PT)

- 15:14 Richard - SUS work, ITMs, BS, and MMT1
- 15:23 JeffB - both end stations for Dust Monitor install
- 15:30 ChrisS to mid-X to retrieve items, no VEA entry
- 16:11 Fire Department - testing in OSB
- 16:11 Filiberto/TJ - EY then EX RF cable pulling
- 16:27 Christina - EX and mids
- 16:28 Hugh - restarted HAM4 and HAM5 models, all working
- 16:43 Ryan - restarting Remote Access, alog
- 17:00 GRB test alert
- 17:30 ChrisS - resumes beam tube sealing on X-arm roughly 300 yards from corner station
- 18:00 Gerardo - BSC5 recharge canister outside of chamber, 6 hours
- 18:00 Cheryl - H1 PSL Anti Room access for parts
- 18:02 Brynley/Vinny - heading to EY to get their magnetometer equipment
- 18:10-18:43 DaveB - SUS hardware wd swap out (CERitmy & EY ETMy)
- 18:10 portapotty service
- 18:12 ITMx sattelite back
- 18:13 Paradise water
- 18:23 Elli, Nutsinee - looking for TCS sled in west bay
- 18:44 Dave - ETMy SUS hardware wd swap
- 18:45 Ken - variacs work for bubba
- 18:45 JeffB - completed dust monitor work at end stations
- 18:57 Ed, JoeD - HAM5/6re-install sattelite amps
- 19:21 DaveB - done at EY with SUS hardware watchdog
- 19:21 JimB going to EX to look at electronics
- 19:50 Kiwamu - CO2 laser heating tests using ITMs and SRC

8:50 - 9:53:  Ran charge measurements on ETMX & ETMy, per these instructions. 

The only activity at end stations were:  Fil & TJ were pulling CPS RF cables at EY (8:25-8:58) & then EX (9:49-ongoing).

Here are the alignment slider values (before/after):

ETMx:

• PIT:  8.6 / same
• YAW:  83.9 / 84.9

ETMy

• PIT:  180.9 / 
• YAW:  -89.1 / 

WHAMs 2 & 3 models were built by Hugo/Vincent while Jim and I were busy building things.  When Jim & I got to bringing the other HAMs up, we did not realise there was a modification needed to generate a non-cust medm screen.  This screen is the PAYLOAD button on the ISI OVERVIEW that gives access to the SUS and the SUS-model-is-not-running-so-trip-the-ISI override controls.

The attached image shows the model elements needing correction.

I switched the Chamber Guardian to STOP.  Interestingly, it then reloaded its code and switched itself to PAUSE, huu?  Anyway, it stayed there and then the ISI Guardian was switched to READY.  The utility of oing this is to keep HEPI ISOLATED.  Once there, I opened the MASTERSWITCH and updated the safe.snap for FF settings.

JimB then restarted the FE.  The medms are now available and the ISI reisolated fine.

Apparently, I failed to file a work permit nor Inegration Issue, else, I'd list those items here.

02:18 UTC Sheila and Jenne at end X checking green beam alignment
02:53 UTC Nutsinee to LVEA to find equipment for Elli
03:22 UTC Nutsinee back
03:40 UTC Sheila and Jenne back
04:15 UTC X arm locked on green
05:29 UTC Initial alignment done
09:31 UTC ISC_LOCK set to down. Started script for ring heater test.

Cheryl, Jenne and Sheila were struggling to get the X arm realigned on green after HEPI and ISI trips earlier in the day. After this was resolved we ran through an initial alignment. We have since been having trouble with engaging the ASC loops. We have left the ISC_LOCK guardian at down and started the script for the ring heater test.

I have extended the cross spectrum analysis (see 25009 and its comments) to the entire O1 run.

Preliminary conclusions are that:

• Noise in 80 -160 Hz seem to have fluctuated by about +/- 20%.
• Noise in 80 -160 Hz seem to have kept the same spectral color.

I will dig into some interesting days or periods and study how different things were.

[Setting up band limited rms]

To analyze the cross spectrum as a function of time, I decide not to do spectrogram type analysis which may contain too much information. Rather I wanted to study the time evolution of the band limited rms. This approach is very similar to what Gabriele does (e.g. 22514).

I selected eight interesting bands in which I avoided tall peaks in the spectrum because I am not interested in their amplitudes in this study. The attached below shows the eight selected frequency bands.

The frequency bands are chosen as follows,  Band 1 = [20 25], Band 2 = [30 35], Band 3 = [50 55], Band 4 = [81 95], Band 5 = [101 110], Band 6 = [121 126], Band 7 = [130 140] and Band 8 =[150 156].

[Time-varying calibration parameters are corrected]

I have corrected for all kappas, the time varying calibration parameters, by applying them to the H1 DARM model of the calibration group. Since one cross spectrum is produced from a twelve minutes integration, kappas are also averaged for twelve minutes. Therefore, the data sets that I analyzed here must be less sensitive to calibration errors due to the time varying parameters which can deviate roughly by 10% from the reference values.

[Glitches and transients are removed]

I have removed data segments that were contaminated by some glitches or transients because I am not interested in their characteristics. This was done by computing an average Rayleigh static over the frequency range from 60 to 100 Hz and rejecting the segment which had a Rayleigh statistic deviating from unity by more than 10%. So the data set I analyze here has more or less good Gaussianity.

[Result 1: time evolution]

The attached plot below shows the band limited rms of the selected eight frequency bands as a function of time in days starting from Sep-01 00:00:00 UTC.

Typically, the two lowest bands (band 1 and band 2) vary more than the others presumably due to the fact that they can be easily degraded by seismic activities, alignment loop and LSC feedforward. In contrast, the rest of high frequency bands (bands 3 -8) are more stable but still do fluctuate. Notice that the high frequency bands decreased their rms at t = 50 days or so. I believe that this is due to Robert's improvement of reducing the PSL jitter coupling (22497). Also, one can find many interesting periods where one of the bands increased the displacement while the rest stayed unchanged and so on. I will try to check those interesting days later.

The fluctuation of the four highest bands (bands 5 -8) are at 15-20 % level (or 30-40 % in peak to peak) with high sigma data points excluded.

By they way, I forgot to multiply sqrt(df) with df being the frequency resolution to all the band limited rms . The frequency resolution df is currently 0.1 and therefore all the data shown in the above plot should be lowered by a factor of sqrt(0.1) = 0.3. This does not change the main conlusions.

[Result 2: behavior of the high frequency bands]

Now, the plot below shows a primitive correlation plot.

where the horizontal axis represents the displacement of band 8 and the vertical axis is for the rest of the bands in order to show correlation with band 8. I have excluded the first 50 days in which the high frequency noise was higher due to the PSL jitter coupling. By the way, the x-axis is in log scale although it may look linear to some people. As seen in the plot, bands 4-7 show a positive correlation with band 8. Also their slopes seem to be identical. These indicate that noise level above 80 Hz fluctuate in such a way that it keeps the same spectral color. As mentioned above, the size of fluctuation is about 15-20% for bands 4-8.

All the data in the above plot should be lowered by a factor of 0.3 for the same reason as the time series plot . This does not change the main conlusions.