Richard, Fil, Jim W, Jim B, Dave

The voltage outputs from the gust meter when it was installed at EX yesterday did not look correct and did not correlate to wind conditions. Today Jim W brought the unit back to the shop and we tested it with a fan. There was some variation in voltage output but it did not look correct when referencing the manual. Jim Bconfigured the system for RS232 serial communications and logged into the unit. The serial readbacks for wind speed, azimuth and elevation looked correct. Jim reprogrammed the three voltage outputs to be Speed, Azimuth and Elevation. We then set the system back to analog voltage mode, and now the outputs vary by many volts and are V1=speed, V2=azimuth, V3=elevation. We suspect the system lost its programming at some time and was perhaps outputting U,V,W  analog voltages.

The unit is ready for re-install at EX.

Ben, Dave:

today I modified h1psliss to read the PD5-8 FAST and SLOW channels. On paper it looked like the h1psldbb model was not using the last eight channels of its ADC (the fourth adc, or ADC3). In practice the DB25 connector for the last eight channels of this AA chassis have a cable connected. (Note to team-psl, perhaps the model should be recording these channels). I had already made the model change and restarted the DAQ before we discovered this.

Ben suggests for plan-B we re-use eight of the ISS ADC channels for reading PD5-8. We are going to disconnect the production ISS cables from ADC0 chans 16-23 and replace them with the new ISS PD5-8 cables during tomorrow's test. Specifically ADC0 chans16-19 are PD5-8FAST, chans20-23 are PD5-8SLOW.

I've modified h1psliss, we will wait until tomorrow morning the restart the model and DAQ.

This morning Ed asked me to look at some trend plots he had just generated.  Clearly noticeable was a sharp
rise in the humidity and a drop in the flow rates for the heads.  I checked the crystal chiller and its
water level was below minimum and the controller displayed an error informing of such.

    Attached is a picture of the burst hose attached to the head 3 water cooling circuit.  This is the same
connection that failed ~2-1/2 years ago.  I do not recall if it has been adjusted since that time.  Although
care is/was taken to prevent twisting of the hose when the fitting is tightened, it is highly likely that
there was a small twist in the hose that exerted a small shear resulting in the tear seen in the picture.

    Also attached is a picture of the 4f lens for head 4, clearly showing some water droplets on it.

    Apart from the obvious step of replacing the hose, the turbine flow sensor for head 4 will also be
replaced.  The laser will take the better part of a day to dry out - to be on the safe side.  All optical
surfaces and the fibre bundle tips will need to be inspected for cleanliness before any operation of the
high power oscillator is contemplated.

(All times in PST)

Today's Headline:  H1 PSL Water Leak.  

H1's state this morning:  DOWN.  ITMx was swinging around, and Kissel cleared history for M0 Lock to calm it down.

• 8:40-9:41:  ETM Charge measurements (Kissel)
• 8:46 - done?:  HAM6 ISI investigations (Jim W)
• 8:47 - 9:40:  Checking MX hvac sensors (Bubba)
• 9:02-10:48:  TCSx rf driver investigations (Jason & Alastair)
• 9:05 - 9:58:  Turning off/removing two (of 4) HAM6 pumps (Kyle)
• 9:09:  Fire Dept on site for RAFAR (Radio & Fire Alarm Reporter) problem:  Will need to visit all buildings with RAFAR box.
  • 9:40-ish:  Bubba noted that their two vans went over the X-arm bridge (Looks like they thought they could get to the box by driving around the building. [?])
  • 9:50:  Third vehicle arrived
• 9:57 MX Compressor work, also gave an MX Instrument Air alarm (Joe D)
• 10:12:  ISS cable pulling
• ~9:45am:  Noticed we had a PSL WD trip (no alarm, just noticed no light).  Possible chiller water leak, noticed from dataviewer check by Ed/Peter.
• 10:36:  Restart ISS Model & DAQ on the PSL  (Barker)
• 11?:  TCSy work (Alastair, Jason)
• Facilities Tour out to MX (Bubba)
• 10:55  Checking Gust meter cabling at EX (Jim)
• 11:00:  Investigate possible PSL chiller leak in H1 PSL Room(Peter, Ed)
• 11:05:  Another gust meter check (Jim, Ian, Fil)
• 11:08-11:40:  Jenne LVEA tour with cousin
• 11:13- lunch time:  TCSy work begins (Alastair, Jason)
• 1:05:  ISS Cable pulling (Alfredo, Ben, Fil, Mark)
• 1:35:  Check microphone electronics in CER (Terra)
• 1:38:  framewriter testing (Jonathan)
• 1:48:  HAM6 VAC check (Chandra)
• 1:59:  Eyewash station maintenance (Bubba)
• 2:30-2:42:  PNNL Tour in CR (Jeff K)
• 3:05 Continuing TCSy work (Alastair, Jason)
• 3:06-3:26 CP3 fill (Kyle)
• 3:52:  Checking tubing for chiller in the diode room (Jeff B)
• 3:53:  Checking POPX at ISCT1 (Sheila)
• 4:01:  Mic Check (Terra)

Turned off locking servos for the night for ISS, FSS, & PMC.

LN2 at exhaust in 8 minutes

In preparation for the next CW hardware injection test, the /hinj/Details/pulsar/ subdirectories on h1hwinj1
have been updated. Here are the major changes:

Two new subdirectories have been created: O2_H1_test1 and O2_L1_test1. Separate H1 and L1 directories are now
needed (as was the case in initial LIGO) since explicit inverse actuation files are used.
The signal amplitudes in the PulsarXX_StrainAmp.cfg files 
in these subdirectories have been doubled for pulsars XX = 0, 1, 2, 4, 7 and 9
and tripled for pulsar 14 with respect to the amplitudes used in O1. These
increases are meant to allow quicker validation of injection recover fidelity.
Evan's new inverse actuation function for L1 has been copied to the O2_L1_test1 subdirectory.


The symbolic link RELEASE in /hinj/Details/pulsar/ has not been changed yet.
When we are ready to perform a test, we will change it from its current pointing to O2test
to O2_H1_test1.

CPS sensor checks for BSCs and HAMs - measurement taken around now-6hours, or about 14:30UTC today.

Nothing remarkable - spectras look good.

Nothing unusual to report. Typical noise at both end stations and data glitching at EY. Corner station pressure shows pump removal as described in Hugh's aLog. Corresponding control activity for this action is also notable in the plots.

Peter, Ed

Investigation currently underway regarding potential water leak in HPO.

J. Kissel

This is your weekly assessment of charge accumulation, resulting effective bias voltage, and actuation strength change of the ETM ESD systems. The extremes of each test mass are now showing ~30 to 40 [V] of effective bias voltage, which is an actuation strength change of ~10% from nominal. ETMX's quadrants are all consistently at +30 [V]; ETMY's quadrants are less consistent, with some showing as little effective bias voltage as -10 [V]. 

Sadly, we've still not fully recovered the IFO since ER9 so we've still not yet been comfortable with the lock acquisition sequence to commission regular bias flipping (or even flipping it once), but let's hope we can get there soon! 

(I encourage the commissioning vanguard to not wait for me to be present to try...)

Required climbing on HAM5/HAM6.  Two pump carts left running in LVEA for rest of week, one at South door of HAM5 and the the second on North side of tube near HAM4.

Digging into the HAM6 ISI and shutter issues, I found that the "high" isolation filters had very low phase margin in DTT open loop measurements, something like ~10 degrees or less. These have not been changed since before O1, so either something has changed the plant or we've been living on the edge. The Matlab commisioning scripts say the installed loops should have had more like ~20 degrees.  I've done a quick adjustment on them, and now the DTT measurments show more like 20-30 degrees. First attached plot shows the X DOF DTT OL measurments. Blue is before, red is after UGF is now about 32 hz and phase margin is about 22 degrees.

I don't think this will have large effect on the performance of the ISI, the difference in gain at 1 hz is a factor of <10, but it went from 10000 to ~ 1000, the gain at 10 is different by less than a factor of 2. The attached pdf shows the matlab commissioning plots for X, Y and RZ, the first 3 pages are the old loops, last 3 pages are the new. Pages 1 and 4 are for the X dof, which should be compared to the first image. Still more digging to be done, I'm not sure why the commissioning scripts are off so much.

The shutter still saturates the actuators, but I've triggered the shutter a half dozen times this morning and the actuators get ~3000-5000 saturations each time it shuts. There are a few hundred more when the shutter resets, so we can probably ride out one cycle, before clearing the saturations, which I think the ISC_LOCK guardian does. I don't believe this fully avoids trips, yet, but re-isolating should be better in the event of a trip.

Terra, Sheila

Tonight we had trouble engaging the ASC again.

• We still have trouble turning up the gain in DHARD, and didn't get a chance to look at this tonight. We did try reverting the ETMX notches but that doesn't solve the problem. 
• We also had trouble with our MICH error point being wrong, which might have been related to TCS being off durring maintence.  Now that TCS has been on for several hours the MICH loop seems to be working OK. 
• We had to restore OMC QPD offsets that weren't in SDF before today's boots.  We are now back in DC readout. 
• Once we reached DC readout we manually tried the CARM gain redistribution that we had commented out of the ANALOG_CARM state yesterday, and we did not see glitches reappear in the MCL drive.  We left this uncommented in the guardian, so we can try this in the morning.
• Jenne reset the soft offsets for our new alignment, and we also got rid of the POP A yaw offset.

Losing optical gain in POP X

We rang up what we think is a PR3 bounce mode when engaging the ASC the same way as last night.  We found that we could avoid ringing this mode up by keeping the PRC2 gain low (digital gains of -500).  Right before the OMC damage/vent, the POP X path was reworked and the optical gain seemed suspiciously low. 

Tonight we found that the optical gain has decreased even more.  Terra changed the demod phase by dithering PR3 pit (500 counts to M3) and rotated the phase positive 65 degrees, (Q1, Q2, Q3, Q4 from 55, 53, 54, 51 to 120, 118, 119, 116 ) to maximize the signal in I (minimize the Q signal).  The 2 attached figures show Terra's before and after OLG measurements (excitation gain of 50), both with Jenne's gain of -5000, showing a 10dB increase in optical gain which is about what we expected based on the dither amplitude change. 

After optimizing the phase, we did not see the 28 Hz mode get rung up, but this seems to come and go because we also didn't see it yesterday.  We quickly tried moving L2 on the POP X path, while watching the amplitude of the PR3 dither line in the POP X signal.  We moved the lens about 4 inches closer to POP X and about 3 inches further away, and didn't find any location that had more signal for PR3 so we replaced it as we found it. 

We are going to leave the IFO locked in DC readout 2 Watts with the request set to down so that it will not try to relock. The noise is bad as expected. 

PEM power supplies in the CER mezzanine were swapped out for Kepco model JQE supplies. This model is a 1/4 rack version, and allows for four power supplies to be mounted on one shelf. This is to make room for the ±24V power supplies that will be used to power Beckhoff/Baffle PD Amplifier/ Spool X/Y camera ect. All PEM instrumentation microphones, magnotometers, ect. were powered down from around 10:30 am to 1:00 pm. All power is now restored.