TITLE:    Dec 19 OWL Shift 08:00-16:00UTC (00:00-08:00 PST), all times posted in UTC

Outgoing Ops: Ed

Quick Summary: Useism is hanging at 90th percentile. Violin modes are relatively high (damping still turned off). Wind below 10 mph. Using 45mHz blen everywhere. Have StripTool running to monitor ETMs CPS sensors as Jim suggested (which Ed kindly passed on the information). The computer opposite to Ops station is very slow...

TITLE:    Dec 18 EVE Shift 00:00-08:00UTC (16:00-00:00 PDT), all times posted in UTC

STATE Of H1: Observing

SUPPORT: Jason

INCOMING OPERATOR: Nutsinee

SHIFT SUMMARY:

After repeated locklosses waiting at various stages of the locking sequence after I had changed the blends to QUITE_90 as recommended. I decided to switch back to the 45mHz blends at the end stations. I let the IFO “cook” on ENGAGE_ASC_PART3 for a good long while before advancing. I can’t say conclusively that this change in the ISI blends did the trick, but the IFO went all the way to NLN/78Mpc and it’s been there ever since. EQ bands are nominal. The mean uSeism is slightly above the 90th percentile. Wind is calm. Handing off Locked IFO to Nutsinee.

ACTIVITY LOG:

04:34 Lockloss while at ENGAGE_ASC_PART3

05:00 Switched end station blends to Quite_90 (off axis) to see if locking would improve.

05:33  still no satisfaction locking. Lock breaks at DC_READOUT_TRANSITION, repeatedly. I put a call in to Sheila.

05:32 OMC SUS watchdog tripped.

05:53  it appears that when DC_READOUT_TRANSITION occurs that OMC_LOCK reports OMC not ready as it may still be in TUNE_OFFSETS.

06:05 Waited at ENGAGE_ASC_PART3 for OMC to move to READY_FOR_HANDOFF. Lockloss occured, this time, at the very next step (REFL_IN_VACUO)

06:21 Locklos occurred sitting on ENGAGE_ASC_PART3 Grasping at straws at this point. Haven’t heard back from Sheila.

06:51 FINALLY! Locked at NLN. Switched back to 45mHz blends at Ends. Had to manually start ISS second Loop

MID-SHIFT SUMMARY:

After the lock loss that occurred at 02:54UTC caused by earthquake in Vanuatu and about a 1 hr stand down to permit ring down, re-locking is being delayed by locklosses at various stages in the sequence.

EQ bands have come back down below .1um/s. The mean uSeism is right about the 90th percentile. Wind is calm. Re-locking marches on.

ITLE: Dec 18 EVE Shift 00:00-08:00UTC (16:00-00:00 PDT), all times posted in UTC

STATE Of H1: Observing

OUTGOING OPERATOR: Jim

QUICK SUMMARY: IFO recently re-locked. µSeism @ 90thpercentile. EQ bands nominal. Winds ≤ 10mph.

TITLE:  12/17 Day Shift: 16:00-24:00UTC

STATE of H1: Observing

Support: Typical control room crowd

Quick Summary: Mostly quiet. Evan did some work on DARM, I worked on EX HEPI, lost lock late but got it back in time for the party

Shift Activities:

C. Cahillane

I have updated the LHO uncertainty budget, fixed some bugs, and generated fewer, more relevant plots.

All calibration versions are included in every budget.  I will review the details each version below:
C00: No kappas, no static systematics applied
C01: No kappas, static systematics applied
C02: kappa_tst and kappa_C applied, kappa_pu and cavity pole not applied, static systematics applied
C03: "Perfect", so all kappas and cavity pole applied, static systematics applied
Whenever I do ratio comparisons between model response functions, the "perfect" C03 model is in the denominator.

***** PDFs 1, 2, and 3 *****
These contain the C01, C02, and C03 uncertainty budgets at GPS Time = 1126259461.  (Kappas provided by Darkhan in aLOG 11499.  Thanks Darkhan!)
Plot 1 is the calibration version response function over C03's response function. 
Plot 2 is four plots.  The mag and phase squared uncertainty components plots and the total mag and phase strain uncertainty by itself.
Plots 3-6 are just enlarged versions of Plot 2.

***** PDF 4 and 5 *****
PDF 4 is the Sensing fits and statistics
PDF 5 are the Actuation stages fits and statistics

***** PDF 6 *****
This 4 way subplot of all the calibration versions together on one plot.  I plot the mag and phase response functions and their ratios.

For the C01 calibration version, we have under 7% and 4 degrees of uncertainty (See PDF 1, Plot 2)
For the C02 calibration version, we have under 6% and 3.5 degrees of uncertainty (See PDF 2, Plot 2)

We went to commisioning as LLO was down, as I was setting up ETMX they came back online.  As I returned ETMX to its nominal state so we could go back to observing I broke the lock.

The sensor correction on ETMX HEPI needs to be changed, it is using a bad filter. I think it's using a filter that we adjusted for the T240 that used to be installed there. The fix is a simple copy, paste from another bank, but its causing a lot of extra motion at EX. But it's possible that there maybe other issues

I noticed yesterday that the EX ISI Z performance was bad at low frequency compared to the other chambers. First plot shows  each test mass chamber T240 Z spectra. Red is ETMX, blue is ETMY, green is ITMX, brown is ITMY. Around 10mhz ETMX is doing very poorly, it should look like ETMY, which is in a similar configuration. ITMX and ITMY look different because they are still running the 90mhz blends in Z, as Hugh logged a couple weeks ago, alog 24115. I immediately expected some component of the Z sensor correction on ETMX, because we use a broad band low frequency sensor correction whose gain peaking is in this frequency band, somewhat lower than the 45 mhz blend. I did an on/off comparison of the Z sensor correction (LLO was down, so I asked the Mike if looking at this was okay). Second plot is the ETMX Z T240 (dashed lines) and STS ground (solid) with Z sensor correction on (red) and off (blue). The dashed red shows the expected suppression of the microseism, but there is a whole lot of extra motion at 10 -50 mhz, the dashed blue shows that this disapperars when I turned the sensor correction off. That I've seen, none of the other BSCs see this, so I think the other filters are correct.

This extra motion is spilling over into other DOFs, mostly RX/RY. The third plot is HEPI IPS (solid) and L4C (dashed) RX, red is sensor correction on, blue is off. RY is similar, but it looks somewhat worse because these measurements were taking when the IFO was locked, so Tidal was running: the X low frequency motion looks really bad on HEPI because of this, RY probably sees some of that.

It's possible this is contributing to the EX ISI ringing up, but the extra RX/RY motion is a little too high in frequency. I've been watching ETMY CPS's today and ETMY X is rung up because of wind. Maybe we have noticed EX ringing up because winds have been mostly north south lately? Or maybe we just can't lock with EY rung up.

The filters are shown in my last plot. Red is the current filter, blue is what the other chambers are running. The gain peaking on red is ~20 at 15 mhz, the gain peaking on blue is ~10 at 30 mhz.

I've continued to analyze stochmon's results (found here) for coherence between the h(t) channels of L1 and H1. One interesting line is at 74 Hz, at which I get coherences at both H1 and L1 from corner station accelerometers. You can find the full results for the coherence here and here, but I've attached some relevant summary slides. Any idea where this is coming from?

TITLE:  12/18 OWL Shift:  08:00-16:00UTC (00:00-08:00PST), all times posted in UTC     

STATE of H1:   Observing at ~75 Mpc.

Incoming Operator:  Jim

Support:   Jim, Jenne

Quick Summary:

The range has been ratty since 8 hours ago. Omicron shows band of glitches around 20 Hz and between 100-200 Hz. I don't see any significance changes in environment from 8 hours ago. I dig through the summary page breifly and found SR3 oplev spectogram looking very nasty started 8 hours ago, but the spectrum doesn't show any misbehave osems. So the cause of these glitches is still unknown.

Shift Activities:

• 11:34 Noticed ETMY timing error. Cleared it while still in Observing.

DMT Omega looks glitchy between 100-200Hz. Useism have reached 90th percentile. Low wind (<5mph). A 5.6M earthquake at North of Ascension Island is coming through. LLO is already down. Hope we ride this one......

TITLE:  12/17 OWL Shift:  08:00-16:00UTC (00:00-08:00PDT), all times posted in UTC     

STATE of H1: Observing

Incoming Operator:  Jim

Support: 

Quick Summary:

Very quiet night. Nothing to complain.

Shift Activities:

TITLE:  12/17 EVE Shift:  00:00-08:00UTC (16:00-00:00PDT), all times posted in UTC     

STATE of H1:   Observing for last 8+hrs with range of ~75Mpc 

Incoming Operator:  Nutsinee

Support:  None needed

Quick Summary:

A nice quiet shift.  useism holding steady at 0.4um/s for the last 24hrs.  The winds seem to be calming down.  And the snow is still on the ground.  Range has been a little ratty-looking 70-80Mpc.

Shift Activities:

• ETMy Saturations:  1:34, 7:27
• 6:16 PSL Crystal Chiller topped off
• 7:44 - 7:48 Acted as Buddy to Fyffe as he went to address PSL power meter (?)

Evan G, Jeff K

Summary:
We finally processed the data Jeff collected (aLOG 21325) to investigate the mysterious zero near 100 Hz. Unfortunately, while we began to further understand the calibration measurements, we also uncovered new issues needing investigation.

Solved:

1. We can verify the DC transconductance of the UIM BOSEMS is ~590 uA/V, and not off by a factor of 2 (see 21127 and 21142), and is an issue with the fast I MON
2. There is some "zero-like device" (see details below) that is at ~100 Hz

New mysteries:

1. The frequency dependence of the "zero-like device" appears to be f^{3/4}... WHUT?!
2. The state 3 and state 4 zero-pole might not be fit that well but we are not sure if it is real, but it looks smallish
3. The CAL model uses incorrect zero-pole pair in the UIM stage, and not using any of the fitted low-pass filter values

Details:

Taking Jeff's measurements of the driver electronics (plotted magnitude only called rawXX.pdf attached) and dividing by the fitted values for the low-pass filters from aLOG 21283, we can see the remaining effect of the BOSEM in the circuit (see XX.pdf attached). We plot the magnitude and phase of each state. Left hand plots are over the full range of 1 Hz to 10 kHz, while right hand plots are zooms from 1 Hz to 200 Hz.

Fortunately, from these measurements, we can confirm that the DC transconductance is: UL = 578 uA/V, LL = 589 uA/V, UR = 582 uA/V, LR = 600 uA/V. Earlier measurements (see 21127 and 21142) had found that this was off by a factor of 2, but we do find the expected value. However, when trying to understand the "zero-like device" we found that the frequency dependence at higher frequency goes like f^{3/4}! Now we are confused.

Looking closely at the low frequency region, and in the zoom (right hand plots) we see that the fitted zero-pole pair doesn't quite take out the low-pass filters for state 3 and state 4 (last two low-pass stages). This could be because of the buffers in the driver electronics, but we are not sure if this is really the cause.

We also started looking at the parameters file for the CAL model and found that the UIM parameters have the wrong zero-pole pair and, in addition, are not using the fitted low-pass filter values. This needs to be rectified.

The script that plots these results is in:

/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/ER8/H1/Scripts/Electronics/analyze_uimdriver_wBOSEM_20150908.m

The omicron scans of the top ten Hanford BBH/BNS triggers on December 16th show a notable recurring wave-like glitch. The glitches are present in the following scans:

https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BBH/GW/1134302174/
https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BBH/GW/1134294300/
https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BBH/GW/1134291513/
https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BNS/GW/1134295111/

Inspection of the auxiliary channels revealed that these signals seem to stem from one channel: H1:ASC-Y_TR_B_PIT_OUT_DQ.The scans for this channel are visible here:

https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BBH/1134302174/#H1:ASC-Y_TR_B_PIT_OUT_DQ
https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BBH/1134294300/#H1:ASC-Y_TR_B_PIT_OUT_DQ
https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BBH/1134291513/#H1:ASC-Y_TR_B_PIT_OUT_DQ
https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/BNS/1134295111/#H1:ASC-Y_TR_B_PIT_OUT_DQ

The rest of the scans from December 16th can be accessed from the chart here:

https://ldas-jobs.ligo-wa.caltech.edu/~jacob.broida/Dec16/Results.html