TITLE: 07/18 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Corey
SHIFT SUMMARY:
LOG:

15:00 Chris & Bubba working on fans
15:00 Pep to EY
15:00 Richard to CER mezzanine
15:00 HFD on site
15:15 SEI_CONF take to SC_OFF_NOBRSXY, IFO still locked
15:30 Richard Marc to LVEA to move rack near HAM6
15:30 JeffB to both ends compressor rooms, done 16:00
15:45 Cheryl & Sheila to PSL to remove gig-e camera
15:45 Hugh and Richard to TCSY to look at laser trip, out 16:00
16:15 Chandra to VEAs for viewport tabs
16:30 Marc to CER
17:00 Chris to VEAs
18:00 Mike to LVEA with tour
18:00 Pep to EY
20:15 Sheila, Jian to LVEA comm excitations
20:30 Travis to LVEA
20:30 Richard to CER
21:30 Sheila, Thomas doing CARM measurement

We lubed all of the supply fans on site today and as part of the quarterly lube, I switch fans and chillers at the end stations. This was done this morning during maintenance and all settings on the chillers and air handlers currently running are duplicated. There may be a slight lag in the temperature catch up. Should be < .75 F. 

Keita and Daniel pointed out that one way to check if all of our range loss is due to subtractable jitter noise or something else, is to compare cleaned data from before the earthquake to after. 

In the attached plot, the blue trace labeled "Orig" is the raw data from the 15th of July, before we (accidentally) switched to using only one DCPD.  The red-orange trace labeled "CleanPostEQ" is from that same 15 July time, but has been cleaned.  The yellow trace labeled "CleanPreEQ" is cleaned data from the 5th of July, just before the big Montana earthquake hit us. 

The ratios in the bottom portion of the plot are the 2 cleaned spectra compared to the raw post-EQ blue spectrum.  Because of this, the % improvements in the title of the plot are misleading.

The conclusion is that we definitely have some noise below 90Hz or so that is not witnessed by the IMC WFS, the PSL bullseye, the ASC Hard loops, or the vertex length loops.

Richard, Fil, Dave, Carlos, Cheryl

The two digital GIGE cameras Cheryl installed on the PSL table are now producing images.

The cameras are called h1iogige1 (10.106.0.52) and h1iogige2 (10.106.0.53).

I have reconfigured  h1digivideo2's VID-CAM28 and VID-CAM29 to be IO GIGE 1 and 2. For some reason monit had VID-CAM28 commented out, I reactivated this camera. I changed the MEDM screen to show the correct names (image attached).

Keita pointed out that we have only been using OMC DCPD B for at least the last lock.  I trended the relative gains of DCPD A and DCPD B, and it looks like we've been in this situation since 16July2017 at around 05:30 UTC.

The attached is a 5 day trend of the gains.  The 2 spikes earlier are when we were either adding or removing a layer of whitening, due to the violin modes being too high.  On the 16th, it looks like the guardian was started to switch the whitening, but then maybe got stopped halfway.  This explains why it has looked like the shot noise was too high the last few days.

Clearly we need to write into the READY_FOR_HANDOFF OMC lock state to ensure that the 2 gains are both at their nominal values.  Also, it looks like someone accepted the wrong values into the Observe SDF file, so we've been able to go to Observing with the wrong values :(  No good.  The safe SDF file was correct.  I'll fix the Observe file.

EDIT:  Looking through the guardian log file, it looks like the code gets a bit confused when you try to use these states before we're using the DCPDs for DARM.  So, now if we're at DC_Readout_Transition or before (and don't need to do any gain ramping), we skip the gain changes and just change the whitening.  If we're on DC_Readout or after, the change will happen as before.  Either way, at the end of the state is now a check to see if the DCPD gains are equal (they should both be 1000).  The new code is in the svn and has been reloaded, although not actually used.

• gouy phase is around 88deg
• beam waist size between GigE cameras is 150um
• at 30W input to the IMC, the IO beam at IO_lens3 = 42mW
• this beam is attenuated using beam splitters in the beam path between lenses
• at 30W input there is 105uW on each GigE camera

Beam spot measurements: according to these measurements, the beam spots from before to after the 5.8M EQ, and all changes are 0.14mm or less.

Dave and TJ:

we rebooted h1guardian0 because its loading has been regularly in the 50's. TJ recovered the GRD nodes following the reboot.

Looking over the trends, since the interface chassis was restarted and power cable secured, I see no large glitches, especially on corner3 only, that aren't seen on all CPSs and that are not related to ground motion.  Can't access FRS to give a number but I'll keep an eye on this for a few more days.

This morning I performed the weekly PSL FAMIS tasks.

HPO Pump Diode Current Adjust (FAMIS 8431)

I adjusted the HPO pump diode currents, changes summarized in the table below.  All adjustments were done with the ISS OFF.  I have attached a screenshot of the PSL Beckhoff main screen for future reference.

I then tweaked the DB operating temperatures.  The only change was to DB1, all diodes changed from 29.0 °C to 28.5 °C; no changes were made to the operating temps of DBs 2, 3, or 4.  The HPO is now outputting 154.9 W and the ISS has been turned back ON.  This completes FAMIS 8431.

PSL Power Watchdog Reset (FAMIS 3659)

I reset both PSL power watchdogs at 16:26 UTC (9:26 PDT).  This completes FAMIS 3659.

Tried two different browsers;

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IFO in Observing for past 4 hours. Environmental conditions are good. A2Ls are both below reference. Range is holding around 48Mpc.  

J. Kissel

As we're getting slammed by another earthquake, I wonder if there can be a few things that team SEI can change in order to get the SEI platforms back to DAMPED (HEPI robust isolated on L4Cs, HAMs Damping with GS13s, BSC ISIs damping with L4Cs and GS13s) and optics back to DAMPED as soon as possible. Here're the flaws I see at the moment:
(1) SEI_CONFIG manager doesn't turn off BSC-ISI Z sensor correction (at least in EARTHQUAKE_v2), so giant EQs like the current still push HEPI in Z enough that it makes the T240s angry and trips the ISI's watchdog, even though the T240s aren't yet involved in any active control. The SEI manager should have a state where it turns off ALL sensor correction, not just horizontal sensor correction.
    EDITNevermind => I had not read Jim's updates to the SEI_CONFIG Guide. We should be in LARGE_EQ_NOBRSXY, and that does indeed turn off ALL sensor correction.
(2) This may be hard, but it would be best if the T240s weren't in the watchdog system until they're used.

Just planting the seed for discussion, no need to pull out ECR pens just yet.

J. Oberling, E. Merilh, J. Warner

The PSL tripped this morning, likely due to the flow in laser head 3.  As can be seen in this alog, the flow in head 3 (and only head 3) dropped from 0.52 lpm to ~0.47 lpm sometime on the morning of Saturday, 7/15/2017.  It is likely this was the cause of the laser trip.  I will do more forensics when I am onsite tomorrow.  When restarting the cyrstal chiller, the flow in laser head 3 was back up around 0.54 lpm.  Maybe something worked its way through the system, causing the laser trip?

When restarting the laser, the Beckhoff software appeared to lose communication with the hardware of the PSL, requiring a reboot of the PSL Beckhoff PC.  Once this was done, everything worked fine and the laser came back up.  I had difficulty injection locking the 35W FE to the HPO; I believe this is due to the lower power out of the HPO.  I engaged the injection locking by turning the RAMP OFF, and monitoring the power circulating in both directions of the HPO.  When the circulating power favored the forward direction, I manually engaged the injection locking.  This worked the first time and the laser is now back up and running.  Ed re-engaged the PMC, FSS, and ISS, and Jim reset the NPRO noise eater.  By this time ~30 minutes had elapsed, so I engaged the LRA and the power watchdogs.  The laser is now up and running.

J. Kissel filed FRS 8539 for this trip.

SudarshanK, RickS

To study the downconversion of Pcal excitation we used a DB9 breakout at the back of the Pcal chassis and routed the excitation channel through H1:CAL-PCALX_WS_PD for now. This will be returned to its original configuration once the investigation is complete.