Laser Status:
SysStat is good
Front End Power is 33.8W (should be around 30 W)
HPO Output Power is 154.8W
Front End Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 14 days, 1 hr 23 minutes (should be days/weeks)
Reflected power = 16.87Watts
Transmitted power = 57.1Watts
PowerSum = 73.97Watts.

FSS:
It has been locked for 0 days 1 hr and 12 min (should be days/weeks)
TPD[V] = 1.446V (min 0.9V)

ISS:
The diffracted power is around 3.2% (should be 3-5%)
Last saturation event was 0 days 1 hours and 12 minutes ago (should be days/weeks)

Possible Issues:

None

I decided to re-do these measurements because the previous aLOG-38213 seemed to have really bad noise associated with the contour plots for ETMY, I think from one of the ALS loops still being active and  trying to lock which flashed some extra light onto the HWS periodically and screwed up the images.

Note: It is a bit difficult to adjust PZT2 to a point where we only saw the ETMY reflection (ETMX still works well), so it seems like the values measured by Nutsinee in aLOG-35979 are no longer valid.  I also found it difficult to search for the new offsets needed so Sheila suggested changing the green QPD offsets instead while the PZT servo was in-loop to make the measurement more repeatable:

- H1:ALS-Y_IP_ANG_YAW_OFFSET = -750 cnts

- H1:ALS-Y_IP_ANG_PIT_OFFSET = 840 cnts

- H1:ALS-X_IP_ANG_YAW_OFFSET = -1000 cnts

We also turned off the PLL locking so that ALS doesn't try to lock as well.

I've attached the first 180 secs after power up, there seems to be some absorption present but no obvious point absorbers.  However, the things to keep in mind are that the ALS-ETM sampling spot size is only about 5 cm in diameter and the overlap with the resonant IR beam is assumed based off the locking process to get up to DC_READOUT and there could be a more precise way to get better overlap between the two beams.

DC_READOUT: 2017-08-29 03:30:00 UTC

NLN: 2017-08-29 03:43:00 UTC

Daniel, Marc

WP7129 

We successfully installed an Anybus Modbus adapter to the Corner 2 Chassis in the CER to prepare for the installation of squeezer.

This morning I completed the weekly PSL FAMIS tasks.

HPO Diode Current Adjustment (FAMIS 8437)

With the ISS turned OFF, I adjusted the operating current of the HPO pump diode boxes.  DB1 increased by 0.2A and no change on DB2, DB3, and DB4.  The changes are summarized in the below table; I also attached a screenshot of the PSL Beckhoff main screen for future reference.

I also adjusted the operating temperatures of the DBs; changes summarized in the below table:

The HPO is now outputting 154.9W and the ISS is back ON.  This completes FAMIS 8437.

PSL Power Watchdog Reset (FAMIS 3665)

I reset both PSL power watchdogs at 16:43 UTC (9:43 PDT).  This completes FAMIS 3665.

Jason O., Thomas V., TJ S.

TCSX chiller tripped at Aug 29 2017 11:21:40 UTC (1188040918 GPS). Flow rate only dropped to ~2.55gpm, this should not trip until 2.0gpm. See attached.

This 2.0gpm limit is set analog via some resistors in the controller. The plan, sometime in the future, is to test this controller and make sure that the resistance is what it is suppose to be, and then fix/replace if necessary.

Thomas and I went out to the LVEA to reset the interlock and it came right back. Verbal briefly complained that it had turned off a few minutes after we got back, but it seems that it just lost lock briefly and the power fell low enough that Verbal caught it. Everything seems okay now.

Sheila, TVo

We successfully swapped DARM control to ITMX.

In this configuration the TMX_DRIVE_ALIGN_GAIN = 150 compared to ETMY_DRIVEALIGN_GAIN = 30 is roughly the right actuation strengths, the OL DARM TF is attached and is roughly unchanged.

 This swap allows us to do a charge measurement on ETMY which Sheila will post about in a separate aLOG.  This did not change the mystery low frequency noise.

Adjusted curtains 

The attached plot shows our typical sawtooth behavior in the timing system. The PPS signals compare the 1 PPS signal from our timing system against other GPS units and the atomic clock. All of these comparisons show this sawtooth indicating it is a feature of our timing system. The master GPS unit which feeds our timing system is a Trimble unit. The GPS_A_PPSOFFSET channel is an internal readback which is read through an RS232. It shows ~80ns single second jumps up and down in synchronization with our sawtooth. This might be an indication that the sawtooth originates in the Trimple. The OCXERROR channels shows the 1 PPS comparison between the timing system and the Trimble unit. It is uses as an error signal for the timing master OCXO. Units are ns except for the OCXERROR which is in seconds. The -1450 ns offset is in the atomic clock.

TITLE: 08/28 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: None
SHIFT SUMMARY: Jeff K. ran charge measurements. Sheila fixed a bug from the SUS model change that accounted for additional low frequency noise seen yesterday and this morning.
LOG:

15:00 UTC Restarted nuc5.
15:04 UTC Restarted video2.
IFO stuck at LOCKING_ARMS_GREEN upon arrival, ETMY needed alignment.
15:20 UTC Kyle to end X VEA.
15:29 UTC Lock loss from CARM_ON_TR.
15:31 UTC Restarted video4.
15:42 UTC Lock loss from DRMI_LOCKED.
15:48 UTC Set ISI config to WINDY_NO_BRSX.
15:49 UTC Lock loss from DRMI_ASC_OFFLOAD.
16:00 UTC Kyle back.
16:14 UTC NLN. Additional low frequency noise present.
16:37 UTC Damped PI modes 27 and 28.
17:13 UTC Karen to warehouse and then mid Y.
17:32 UTC Jeff K. tuning MICH feedforward.
17:38 UTC Lock loss.
17:38 UTC Set ISI config back to WINDY.
Leaving in DOWN to let Jeff K. run charge measurements.
17:51 UTC Hugh and Jim to HAM6.
17:59 UTC Hugh and Jim back.
Hugh to LVEA.
TJ to optics lab.
Amber leading tour through control room.
18:27 UTC Hugh back.
18:44 UTC Karen leaving mid Y.
18:48 UTC Sheila restarting ITMY model: SUS and ISI WDs tripped.
Charge measurements done.
18:53 UTC Daniel to squeezer bay.
18:58 UTC Relocking, DAQ restart.
19:10 UTC Daniel done, TJ done.
Starting an initial alignment.
19:34 UTC Phone call: Hanford monthly alert system test.
19:46 UTC Initial alignment done.
20:26 UTC TJ to optics lab.
20:48 UTC Lock loss.
21:19 UTC Bubba and visitor to LVEA.
21:20 UTC Jeff B. to end stations and mechanical room (not VEAs) to check dust monitor pumps.
21:25 UTC NLN. Jeff K. starting BSC ISI charge measurements.
21:28 UTC Bubba back.
21:36 UTC Jeff K. done charge measurements.
21:40 UTC Bubba to H2 electronics building.
21:57 UTC Mike and Fred taking visitor into LVEA.
21:59 UTC Corey taking visitor to overpass.
22:08 UTC Jeff B. done.
22:17 UTC Lock loss (Jeff K. driving HAMS), HAM2 ISI, IM1, IM2, IM3 tripped.
22:45 UTC Mike, Fred and visitor back.
22:53 UTC Timing system error, SYS-TIMING_X_PPS_A_ERROR_FLAG: error code briefly at 1024 (PPS 1 OOR)

The following units have been balance calibrated as per LIGO-T1600116-v1:

#132740069233007, #132740069233002 and 132140069233006

The unit ending in 007 had been currently in use on the optic in the LSB Bonding lab and was found to be out of spec as defined in the procedure listed above. I was able to adjust it into an acceptable balance as per procedure.

#132740069233004 failed to meet the tolerances as stated in the above procedure.

There is another unit in the Bonding Lab garbing area that has no regulator. I didn't get the number off that one

The data for these units may be found here

J. Kissel

First regular charge measurement after O2; last regular charge measurement before the the Test Mass Discharge System (TMDS) tomorrow on ETMX. Trends are consistent with everything that has been true since the July 6th 2017 EQ (I've added by-hand, eye-ball trend lines to guide the eye). The reason I've been wishy-washy on claiming whether there was a jump in effective bias voltage: some quadrants don't show a change after July 6th, others do, and it depends on the suspension. We should really take the time to convert these results into a geometric display of the optic face #between02and03squadgoals. 
 
I won't display the relative actuation strength plots any more, since we don't really care when we're not in an observation run and they don't show much more information than the effective bias voltage plots. If someone still wants to see them, just post a comment to this log with your request.

Jonathan, Dave:

We have disabled the remote LHO CDS login permit system, Yubikey holders can now log into LHO CDS without having to get the operator to open a permit. The access system is running in monitor-only mode, remote logins are being displayed on the CDS Overview MEDM.

Sheila, Dave:

Sheila corrected and restarted the h1susitmy model. The change required a DAQ restart, which was done.

2017_08_28 11:53 h1susitmy
2017_08_28 12:00 h1broadcast0
2017_08_28 12:00 h1dc0
2017_08_28 12:02 h1fw0
2017_08_28 12:02 h1fw1
2017_08_28 12:02 h1fw2
2017_08_28 12:02 h1nds0
2017_08_28 12:02 h1nds1
2017_08_28 12:02 h1tw1

Nothing to report other than the normal, weekly current adjustments and the marginally twitchy chiller plots.

On friday Thomas and I ran excitations on all 4 ESDs in order to measure the 4 coefficients in this equation for the force applied by the ESDs (G1600699) Equation 2:

F = α (V_b-V_s)² +β (V_b+V_s)+ β _2(V_b-V_s)+γ (V_b+V_s)²

The first 2 excitations for each suspension were on the bias path with no signal voltage so that the linear response is:

F = [β+β_2+2(α+γ)V_b] δV_b

The bias path was excited twice, first with the normal bias of 380 V on and second with no bias. Then the script excited the signal path which gives a linear response of:

F = [β-β_2+2(α+γ)V_b+2(α-γ)V_s] δV_s

This path is excited 3 times, once with no DC offset on any electrodes, once with an offset of 7.6Volts on the signal electrodes, and once with the bias at its normal value of 380V.

The first 4 of these measurements allow us to make a complete measurement of all four coefficents, α, β β_2, and γ The fifth measurement is redundant and could be skipped, I used it as a sanity check.  I am still worried that I have some signs wrong which are making these results confusing.  

All of the scripts needed for taking the measurement and getting the coefficents are in userppas/sus/common/quad/scripts/InLockChargeMeasurements/

I came in to lock the IFO for Adam's injections which are scheduled for 2 hours from now, (38380), but have had about 4 BS ISI ST1 CPS trips in the last hour. 

Two of these might have happened while the BS was isolating stage 2 (I have not double checked) but at least one happened while we were just sitting in CHECK_IR (no feedback to the BS sus, ISI state should not have been changing).  The screenshot attached is for that most recent trip in CHECK_IR

Edit:  Made it to a fully locked interferometer and was engagning ASC when it happened again, again it was a glitch in the ST1 H3 CPS.  Second screenshot 

Edit again: This seems very similar to the situation described in 37499, 37522 the third screenshot shows the glitches getting worse over the last 1:40 minutes.  Jim describes power cycling the satlite racks which seemed to make the problem go away last time. 

Another update: I power cycled the 3 top chassis in the CER rack SEI C5, these are labeled BSC ISI interface chassis and have cables going to BSC2 CPSs, GS13s and L4C's.  The ISI has not tripped in about 20 minutes, I am relocking but paused to damp violin modes.

[Aidan]

I've been investigating the apparent increase in range that occurred this morning when CO2X was turned off. This would seem to indicate that either (a) the CO2 laser is somehow misaligned/or deformed and causing a very poor lens, or (b) the present level of lensing (SELF heating + CO2) is too much. It's worth noting that the requested (and delivered) levels of CO2X laser power haven't changed significantly over the last four or five months.

If we assume (b) and also that the better range in the past is partially due to a better thermal state, then the conclusion is that either the effective CO2 lens or the SELF heating lens has increased.

I've gone back and looked at the HWSX spherical power data (H1:TCS-ITMX_HWS_PROBE_SPHERICAL_POWER) from two months around the period of the earthquake. The relevant value here is the spherical power change per lock (the difference between the upper and lower levels that are obvious in the time series which shows the transient lens from SELF heating and CO2 laser changes). There is an interesting period form 22-June to 7-July where this trends upwards by approximately 25 micro-diopters (or about 50%). This indicates that the apparent lens change per lock seen by the HWS is increasing significantly.

Two factors also play into this. (1) the CO2 laser is being turned on and off during this time (to keep the thermal state warm when the IFO has lost lock). However there is no significant change in the CO2 power level behaviour over the corresponding time range. (2) we know there is already a point absorber on ITMX as well as uniform absorption. The spherical power value is fitted to the low spatial-frequency lens. The presence of a known high spatial frequency point in the wavefront complicates this. For example, it's possible that the HWS alignment may be drifting and the point absorber is contributing more to the total spherical power value. This obviously needs to be investigated further by looking at the stored gradient fields.

However, it does seem that there is a real effect going on as the range got much better (~15% better) when the CO2 laser turned off. 

I have compiled the results of in-air measurements during installation and in-vacuum measurements from the alogs; 14231 LLO (including corrections mentioned in alogs 21652 and 27901) and 17610 at LHO (including corrections mentioned on the comments).

In the case when a frequency split is shown on in-vacuum measurements we have taken the average of both frequencies. I have grouped these numbers per front and back fibres, then per test mass and then per detector, finally I obtained the difference as (in-vacuum – in-air) including the sign:

We notice that in most cases the frequency difference is always positive, so frequency increases when moving the suspension to in-vacuum.

The increase in frequency is always a few hundred mHz (mean of 0.3Hz and median of 0.4Hz), with a clear outlier on LLO_ITMY_FL (which as explained here seems to be involved with uncertainty in the identification).

There is not clear difference in frequency variation between front and back fibres (especially no sign difference) which would indicate pitch effect.

However, notice that as per the Technical document T1700399 the expected increase in frequency due to buoyancy is of 0.14Hz, and the variation in frequency due to pitch angles of 2mHz is of 0.33Hz (although that would be an opposite sign change between front and back fibres). Therefore while the observed changes cannot be explained through pitch and buoyancy alone, they are of the same order.