This morning I tweaked the operating current and temperatures for the pump diodes for both PSL amplifiers (35W FE and 70W).  The changes are summarzied in the below tables.  This work was done with the ISS OFF.

Pump Diode Operating Currents:

Pump Diode Operating Temperatures:

When I began, the 35W FE had an output power of 32.3W, and after adjustment it had an output power of 32.4W.  Not a big change, but it did bump up the transmitted PMC power by ~0.1W without changing the reflected power.  Further increases in the current made things worse, so I stopped there.  The temperature tweaks had a slight effect on the PMC Reflected power (~0.1W), so I moved on to the 70W amp.

The 70W amp was not happy with any change in the operating current for D3 and D4, but I did see an increase in PMC transmitted power without a corresponding increase in PMC reflected power when I slightly bumped up D1 and D2.  As far as temperature tweaks, the 70W amp was not happy with any tweaks to the operating temperature of D1, D2, or D3 (temp up, temp down, didn't matter, PMC Refl increased and Trans decreased regardless).  On the other hand, lowering the temp of D4 by 0.4 °C lowered the PMC reflected power by ~0.3W without changing the transmitted power; this change did lower the overall power out of the 70W by ~0.3W, but with no corresponding change in the transmitted PMC power, I think this small temp tweak removed some power from higher-order modes.  The 70W amp is currently outputting just under 70W, at roughly 69.7W.  I attached a screenshot of both PSL pump diode Beckhoff screen for future reference.

I also slightly tweaked the beam alignment into the PMC to see if I could further lower the PMC reflected power.  With this complete, the PMC is now transmitting 54.1W (ISS OFF) and reflecting 10.0W.  Upon turning the ISS back ON, the diffracted power was above our upper 3% limit, so I tweaked the ISS Reference Signal from -2.06V to -2.08V.  This changed the ISS diffracted % to ~2.2%, which is where it's been sitting during normal operation.  This change was accepted in SDF, both SAFE and OBSERVE.

To finish, I reset both PSL power watchdogs at 16:38 UTC (9:38 PDT).  This completes FAMIS 10720.

The EY cold-cathode gauges have tripped due to local radio usage. I've bypassed H0:VAC-EY_Y1_PT423B_PRESS_TORR until this work is complete.

Bypass will expire:
Tue Jul 23 12:59:28 PDT 2019
For channel(s):
    H0:VAC-EY_Y1_PT423B_PRESS_TORR
 

TITLE: 07/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
OUTGOING OPERATOR: Niko
CURRENT ENVIRONMENT:
    Wind: 4mph Gusts, 2mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

Have sprung healong into Mainteance!  (& can finally submit this after the initial wave of activity.)

H1 lost lock within seconds of 8amPDT (I was transitioning SEI to No SC/BRS.)

TITLE: 07/23 Owl Shift 07:00 – 15:00 (00:00-08:00), all times posted in UTC

STATE of H1: Observing

INCOMING OPERATOR: Corey

SHIFT SUMMARY: Locked early in the shift, noticed ITMX 13 violin mode was in the ~4.5 region but the gain was already set to its nominal state (0). Dropped out of Observing a couple times due to TCS ITMY CO2 laser losing lock (air bubble in chiller?). Then I lost lock switching to EQ mode for a 6.0 near New Zealand, and re-locked ~2 hours later.

LOG:

07:00 (00:00) Start of shift

08:00 (01:00) Locked and going into Observing

08:53 (01:53) Dropped briefly out of Observing to try and damp ITMX 13 before realizing it matched its lsc_params gain setting of 0.

09:46 (02:46) Dropped out of Observing, not entirely sure why. Only notification was for violin damping, but that has been going on (within acceptable ranges) for hours. TCS ITMY CO2 laser unlocked at 09:44 (02:44).

10:15 (03:15) Dropped out of Observing with USERMSG: “Waiting for TCS_ITMY_CO2”. Looking at the TCS_ITMY_CO2 log shows the laser unlocked at 10:14 (03:14). Given Corey’s post from yesterday (50702), I would imagine a new air bubble has formed in the TCSY chiller.

11:39 (04:39) Lockloss when trying to change SEI_CONFIG to EARTH_QUAKE. Despite the Nom vs. EQ SC outputs looking okay, it seems this caused the lockloss.

12:15 (05:15) As far as I can tell, FSS unlocked during ENGAGE_ASC_FOR_FULL_IFO, causing things to swing around until I took the IFO to DOWN. Waiting for FSS to relock.

13:12 (06:12) At NLN, going to Observing. Waiting for some high violin modes to ring down.

14:08 (07:08) Chris moving forklift to OSB parking lot

14:45 (07:45) Starting PEM injections

14:46 (07:46) Robert to E-bay -- turn wifi on

14:49 (07:49) Robert back from E-bay

14:55 (07:55) Bubba, Chris to EX, MX, MY, EY -- lubricating fans

14:55 (07:55) HFD to EY

15:00 (08:00) End of shift

Accepting the following sdf changes to go into Observing. It should be noted that the LSC signals have been fairly noisy throughout the locking process, and remain noisier than usual despite low wind and seismic activity.

Ops Shift Transition: 07/23/2019, Owl Shift 07:00 – 15:00 (00:00-08:00) - UTC (PT)

State of H1: Lock acquisition

Intent Bit: Commissioning

Weather: 0-10 mph wind

Primary 0.03 – 0.1Hz: 0.01 um/s

Secondary 0.1 – 0.3Hz: 0.1 um/s

Outgoing Operator: Travis

Quick Summary: Continuing Travis’s re-locking efforts. Low wind, low seismic activity.

TITLE: 07/23 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Niko
SHIFT SUMMARY:  After lockloss, DRMI would not lock.  Locked PRMI and tweaked BS and PRM.  Still no luck with DRMI.  Tried tweaking up SRM during DRMI locking, but no luck.  After half an hour or so of tweaking and hoping DRMI would lock, started Initial Alignment which completed with no issues. 
LOG:

No obvious cause.  SEI and wind are both relatively calm. 

Finished doing the 8,000 hour service (13,400 hours) on VBOD's two scroll pumps -> VBOD and VBOC are now available

    Laser Status:
    Front End Power is 32.01W (should be around 30 W)
    70W Output Power is 70.03W
    Front End Watch is GREEN
    70W Watch is GREEN

    PMC:
    It has been locked 20 days, 6 hr 14 minutes (should be days/weeks)
    Reflected power = 10.26Watts
    Transmitted power = 54.39Watts
    PowerSum = 64.65Watts.

    FSS:
    It has been locked for 0 days 3 hr and 55 min (should be days/weeks)
    TPD[V] = 4.676V (min 0.9V)

    ISS:
    The diffracted power is around 2.2%
    Last saturation event was 0 days 5 hours and 30 minutes ago (should be days/weeks)

    Possible Issues:  None that I can see.

TITLE: 07/22 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 114Mpc
OUTGOING OPERATOR: Ed
CURRENT ENVIRONMENT:
    Wind: 14mph Gusts, 8mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:  All is good now.  I'll avoid pushing any front end power buttons;)

TITLE: 07/22 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 115Mpc
INCOMING OPERATOR: Travis
SHIFT SUMMARY:
LOG:

16:56 Sundae out to optics lab

17:15 Kyle to mid stations

17:23 Start IA

17:25 Peter out to optics lab

19:35 First DRMI lock of the day

20:16 NLN - Staying out of Observing for Robert, Jeff K.

J. Kissel

Since we're still whistling in the dark regarding understanding some of the noise in the mid frequency band, and because we haven't done these tests since O2 (see LHO aLOGs 38132, 38122, and 37752), I gathered a round of broadband injections driving the BSC-ISIs' Stage 2 (ST2) in Pitch (RX and/or RY) and Yaw (RZ), which *used* to have caused coupling with the IFO via what we think was charge. This time, I also measured the BS in addition to the Test Masses, just in case this might be the source of the nasty 48 Hz feature. For RX/RY, my drive (between 10 and 100 Hz) increased the motion of ST2 by a factor of ~100. For RZ, the ST2 motion was increased by a factor of ~1000 during excitation.

I plan to do a more complete (allowing for non-linear) analysis, but from comparing the ASD of -- and coherence between excitation and -- DELTAL EXTERNAL during the excitation against ambient, the only injections that were even remotely coherent (at the 0.3-0.4 kind of level at worst, in select ~few Hz wide, likely QUAD Cage frequencies around 70 and 90 Hz) were excitations that drive the stage a factor of ~1000 above ambient noise floor. In other words, *any* coupling from this kind of motion to DELTAL_EXTERNAL is at least a factor of 100 away from the noise floor.

Data result templates live and have been committed here:
/ligo/svncommon/SeiSVN/seismic/BSC-ISI/H1/Common/Data/
    2019-07-22_BSCISI_ST2_BB_RX_Injections_BS.xml
    2019-07-22_BSCISI_ST2_BB_RY_Injections_BS.xml
    2019-07-22_BSCISI_ST2_BB_RZ_Injections_BS.xml

    2019-07-22_BSCISI_ST2_BB_RXRY_Injections_ETMX.xml
    2019-07-22_BSCISI_ST2_BB_RXRY_Injections_ETMY.xml
    2019-07-22_BSCISI_ST2_BB_RXRY_Injections_ITMX.xml
    2019-07-22_BSCISI_ST2_BB_RXRY_Injections_ITMY.xml

    2019-07-22_BSCISI_ST2_BB_RZ_Injections_ETMX.xml
    2019-07-22_BSCISI_ST2_BB_RZ_Injections_ETMY.xml
    2019-07-22_BSCISI_ST2_BB_RZ_Injections_ITMX.xml
    2019-07-22_BSCISI_ST2_BB_RZ_Injections_ITMY.xml

Attached is the kind of "worst" case coupling I saw, from RZ injections of the ITMs. On the ETMs, during RZ injections, there is a sharp feature at ~95 Hz with a coherence of 0.5. Again, this coherence is with excitations *far* above ambient noise levels, so ambient coupling will be very small, and in most cases, we will only be able to provide an upper limit.

More analysis to come.

Accepted diffs:

Everything looks ok. PMC power seems to have improved a bit.

Some BSC channels louder than others but nothing outstanding to report.

C. Vorvick, E. Merilh, J. Kissel, J. Driggers,
FRS Ticket 13295
Revelant LHO aLOGs 50695 50698 50706.

Continuing notes from LHO aLOG 50706.

19:35 UTC First lock of DRMI. Quite quick after PRMI this time.

19:40 UTC Hanging out in DRMI_LOCKED_CHECK_ASC for a little bit extra amount of time. 

20:16 UTC Recovered NOMINAL LOW NOISE, checking in on a few ASC differences.

Starting ISI / HEPI Injections, recovery considered DONE at 20:16 UTC.

About 6 hours of slow drift caused some issues relocking and maintaining IMC lock.  Around 15:30 UTC, 8:30AM local, the IMC was unlocked, reset to 7/22 5:06 UTC alignmet, and relocked, and was stable, and withing urads of it's previous alignment.

Plots attached show the drift.

- Ed, TJ, Cheryl, Jenne, JeffK

    Lost lock at  00:12 (17:12). 

While relocking: 

   (1). ALS-Y would not build up or lock. Tweaked ETM-Y in pitch and yaw to get it to lock. Then dressed up TMS-Y in pitch to get build up above 1.0. It took two attempts to get past DRMI_1F.   Lost this lock attempt at PREP_DC_READOUT_TRANSITION. OMC had Failed to find Carrier message. 

   (2). Green locked OK. IR Diff was not found, so I tweaked it by hand. Locking stuck again at DRMI_1F. After 12 minutes, and because the AS_Air spot looked so bad in the first lock attempt, I tried to engage CHECK_MITCH_FRINGES, but it never reached it. Lost lock around DRMI_1F.

   (3). Next couple of lock attempts made it past DRMI_1F OK. Then started getting OMC Did Not Find Carrier or Wrong Mode? messages. After losing lock while trying to sort out OMC issue, stopped at ENGAGE_SOFT_LOOPS to work with the OMC to get it READY_FOR_HANDOFF. Again lost lock.

   (4). Called Keita. Stopped at PREP_ASC_FOR_FULL_IFO to work on getting OMC to lock. Was able to get OMC to READY_FOR_HANDOFF. But would continue to lose lock at ENGAGE_ASC_FOR_FULL_IFO. 

   (5). Running an Initial Alignment now and will try to relock when complete.