THe LVEA was swept in accordance with LIGO-T1500386v7. There was the usual whirring of fans in the vacuum rack,  from a bench-type power supply on the floor at TCSX table and rather noticeably through the wall from the CER/High Bay area. I noticed some condensation dripping from CP1 and forming a little puddle on the floor.

The power cart/transformer next to HAM4 was powered down around 11:50 am. Panel VEAC-02 circuits 13,15, and 17 were turned off. The only extension cord connected to the power cart was connected to the Hartmann Table (TCSHT4R) for fans and lights, which are currently not being used.

J. Kissel

Took more standard top-to-top transfer functions today in order to rule out any rubbing from the July 6th EQ. I've closed out the doubles and triples by getting high-res data of the TMTS and IMC HSTS (I got the OMCS last Tuesday). Below are the listed data files. More detailed plots and analysis to come. 

This leaves only the single suspensions (IMs, RMs, OMs), and these should be pretty quick since there are only 3 DOFs per SUS instead of 6.

The data lives and is committed here:
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/
MC1/SAGM1/Data/2017-08-01_1645_H1SUSMC1_M1_WhiteNoise_L_0p01to50Hz.xml
MC1/SAGM1/Data/2017-08-01_1645_H1SUSMC1_M1_WhiteNoise_P_0p01to50Hz.xml
MC1/SAGM1/Data/2017-08-01_1645_H1SUSMC1_M1_WhiteNoise_R_0p01to50Hz.xml
MC1/SAGM1/Data/2017-08-01_1645_H1SUSMC1_M1_WhiteNoise_T_0p01to50Hz.xml
MC1/SAGM1/Data/2017-08-01_1645_H1SUSMC1_M1_WhiteNoise_V_0p01to50Hz.xml
MC1/SAGM1/Data/2017-08-01_1645_H1SUSMC1_M1_WhiteNoise_Y_0p01to50Hz.xml

MC2/SAGM1/Data/2017-08-01_1733_H1SUSMC2_M1_WhiteNoise_L_0p01to50Hz.xml
MC2/SAGM1/Data/2017-08-01_1733_H1SUSMC2_M1_WhiteNoise_P_0p01to50Hz.xml
MC2/SAGM1/Data/2017-08-01_1733_H1SUSMC2_M1_WhiteNoise_R_0p01to50Hz.xml
MC2/SAGM1/Data/2017-08-01_1733_H1SUSMC2_M1_WhiteNoise_T_0p01to50Hz.xml
MC2/SAGM1/Data/2017-08-01_1733_H1SUSMC2_M1_WhiteNoise_V_0p01to50Hz.xml
MC2/SAGM1/Data/2017-08-01_1733_H1SUSMC2_M1_WhiteNoise_Y_0p01to50Hz.xml

MC3/SAGM1/Data/2017-08-01_1703_H1SUSMC3_M1_WhiteNoise_L_0p01to50Hz.xml
MC3/SAGM1/Data/2017-08-01_1703_H1SUSMC3_M1_WhiteNoise_P_0p01to50Hz.xml
MC3/SAGM1/Data/2017-08-01_1703_H1SUSMC3_M1_WhiteNoise_R_0p01to50Hz.xml
MC3/SAGM1/Data/2017-08-01_1703_H1SUSMC3_M1_WhiteNoise_T_0p01to50Hz.xml
MC3/SAGM1/Data/2017-08-01_1703_H1SUSMC3_M1_WhiteNoise_V_0p01to50Hz.xml
MC3/SAGM1/Data/2017-08-01_1703_H1SUSMC3_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/TMTS/H1/
TMSX/SAGM1/Data/2017-08-01_1503_H1SUSTMSX_M1_WhiteNoise_L_0p01to50Hz.xml
TMSX/SAGM1/Data/2017-08-01_1503_H1SUSTMSX_M1_WhiteNoise_P_0p01to50Hz.xml
TMSX/SAGM1/Data/2017-08-01_1503_H1SUSTMSX_M1_WhiteNoise_R_0p01to50Hz.xml
TMSX/SAGM1/Data/2017-08-01_1503_H1SUSTMSX_M1_WhiteNoise_T_0p01to50Hz.xml
TMSX/SAGM1/Data/2017-08-01_1503_H1SUSTMSX_M1_WhiteNoise_V_0p01to50Hz.xml
TMSX/SAGM1/Data/2017-08-01_1503_H1SUSTMSX_M1_WhiteNoise_Y_0p01to50Hz.xml

TMSY/SAGM1/Data/2017-08-01_1504_H1SUSTMSY_M1_WhiteNoise_L_0p01to50Hz.xml
TMSY/SAGM1/Data/2017-08-01_1504_H1SUSTMSY_M1_WhiteNoise_P_0p01to50Hz.xml
TMSY/SAGM1/Data/2017-08-01_1504_H1SUSTMSY_M1_WhiteNoise_R_0p01to50Hz.xml
TMSY/SAGM1/Data/2017-08-01_1504_H1SUSTMSY_M1_WhiteNoise_T_0p01to50Hz.xml
TMSY/SAGM1/Data/2017-08-01_1504_H1SUSTMSY_M1_WhiteNoise_V_0p01to50Hz.xml
TMSY/SAGM1/Data/2017-08-01_1504_H1SUSTMSY_M1_WhiteNoise_Y_0p01to50Hz.xml

Laser Status:
SysStat is good
Front End Power is 33.92W (should be around 30 W)
HPO Output Power is 154.9W
Front End Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 14 days, 0 hr 44 minutes (should be days/weeks)
Reflected power = 16.71Watts
Transmitted power = 57.31Watts
PowerSum = 74.02Watts.

FSS:
It has been locked for 0 days 3 hr and 20 min (should be days/weeks)
TPD[V] = 2.327V (min 0.9V)

ISS:
The diffracted power is around 3.2% (should be 3-5%)
Last saturation event was 0 days 1 hours and 22 minutes ago (should be days/weeks)

Possible Issues:

PMC refl power is marginally higher than usual. Weekly PMC input alignment usually mitigates.

[Sudarshan Karki, Aaron Viets]

Sudarshan asked me how close to the 331.9 Hz line it is safe to inject another line using the X end photon calibrator without affecting the kappa_c and f_cc calculations. The short answer is very close, as long as the line injected is a very pure sinusoid.

I ran a test on about an hour of LHO data starting GPS second 1181534652, in which I added a 332.0 Hz sinusoid to DARM_ERR of similar amplitude to the 331.9 Hz line (see spectrum plot). I then collected data for kappa_c and f_cc from both C01 and the test I ran to compare. They were essentially identical:

                             mean(kappa_c)      std(kappa_c)      mean(f_cc)         std(f_cc)

C01                          1.0305                       0.0030            342.7737            1.6903

DCS_TEST               1.0305                       0.0030            342.7737            1.6903

Not convinced I did this correctly, I did a simpler test of demodulating a 332.0 Hz sinusoid at 331.9 Hz and applying the same smoothing that is done in the gstlal calibration pipeline. The sinusoid was attenuated by a factor of 1e-17, consistent with the above results.

Attached is a 5-day trend of the PSL laser head flow rates.  All is unchanged from the last report of these flow rates; head 2 is still ragged as usual.

This morning I completed the weekly PSL FAMIS tasks.

HPO Pump Diode Current Adjust (FAMIS 8433)

With the ISS OFF, I adjusted the pump diode currents for the HPO.  All currents were raised by 0.2 A, changes are summarized in the table below.  I have also attached a screenshot of the PSL Beckhoff main screen for future reference.

I did not adjust the DB operating temps.  The ISS is now back ON, and the HPO is outputting ~154.9 W.  This completes FAMIS 8433.

PSL Power Watchdog Reset (FAMIS 3661)

I reset both PSL power watchdogs at 16:51 UTC (9:51 PDT).  This completes FAMIS 3661.

J. Kissel

Today's measurement reminds us that we always need several weeks of data to really make a statement about trends when it comes to effective bias voltage. See attached data.

ETMX is still OK.

Today's data from ETMY shows that the effective bias voltage trend we thought we say last week (back towards zero) has been washed away. We see that the effective bias voltage remains as high as ~90-100 [V] in several quadrants.

We're still less that 10% actuation strength change in longitudinal however, even after the reaction chain move that decreased the actuation strength further by a few percent (see LHO aLOG 37854).

I still wouldn't raise the red flags just yet, but I'm glad that the vacuum team is "spinning up" the test mass discharge system.

I happened to open up the laser's Beckhoff screen this morning and noticed that the flow rate in the power meter circuit
was fluctuating between 1.2 lpm and 0.5 lpm.  Apparently it's been doing this for a good fraction of the past week.  For
the time being I've set the trip point to be 0.35 lpm - down from 0.4 lpm.

    Not certain what the problem is right now.  Possibly a partial blockage in an Ophir power meter similar to the
problem experienced over a year ago.

TITLE: 08/01 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 54Mpc
INCOMING OPERATOR: Jeff
SHIFT SUMMARY: locked all shift, out of Observe briefly for violins
LOG:

• 07:52:42UTC - out of Observe, damping violins, alog 37925
• 09:33:54UTC - back to Observe
• 14:45UTC - Karen to MY

Attached is a comparrison of how the OSEMs for ETMX, ETMY, ITMX, and ITMY changed from before the Montana EQ to after.

The OSEM sets (for example, pitch, all stages) are color coded:

• green = sets that are reasonable, which means no sign flips, and numbers are largest at the bottom stage
• yellow= sets that have a sign flips, but all OSEM values are small, and changes are small
• red = sets that have sign flips and have large changes in OSEM values between stages

Just looking at color, ETMX and ITMY are all yellow or red (more likely to have had issues as a result of the EQ?), and only ETMY and ITMX are green and yellow.

Attached is a plot of this lock showing violin modes ringing up starting about 2 hours ago (around 6UTC), and OMC DCPD sum also seeing the same thing.

OMC_DCPD was saturating starting at 7:46UTC, and only ended when I'd completed the removal of whitening from the OMC using guardian.

Unsure of what to do now - calling to see what's wanted now:

• put H1 back into Observe after accepting the diffs, and let the violins ring up. OR
• damp violins

TITLE: 08/01 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 53Mpc
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: Mostly quiet
LOG:

0:10 NLN, with violin mode damping left off, per Sheila's log
0:50 IFO went to commissioning for no reason I could find. IFO guardian only showed some spm diffs on SEI ETMX(that had been there all along), but there were no SDF diffs. No one had touched anything.

We have left the violin mode damping off for one lock, with the intention of measuring violin mode Qs to compare to what was measured in 23383.  We had the damping off starting at 00:05:00 UTC, and will leave it off for the rest of this lock.