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.

Subsystems

• SEI, Hugh:  HAM6 tripping investigations & HEPI pump station continue
• SUS, Kissel:  ITMx M0 was railed (causing it to swing around).  Kissel cleared history for M0 Lock
• CDS, Fil:  One of the magnetometers didn't come back after PEM power supply work yesterday, ISS autoloop cable pulling needed
• VAC:  Can shut down 2 of 4 pumps at HAM6
• FAC:  HVAC walkthrough AT 10am

PNNL Tour this afternoon

H1 request granted for this morning:

• TCSx laser for ~2hrs:  want to use for investigations (to check damaged rf drivers)
• HAM6 investigations (Jim)
• ETM Charge Measurements (Kissel)
• ISS autoloop (Ben & Fil)

Title:  08/16/2016, Evening Shift 23:00 – 07:00 (16:00 – 00:00) All times in UTC (PT)
State of H1: Relocking the IFO after maintenance   
Commissioning: 
Outgoing Operator:  TJ
 
Activity Log: All Times in UTC (PT)

23:00 (16:00) Start of shift
23:05 (16:05) Jason – Out of the LVEA
23:38 (16:38) Jason – Going into the LVEA to turn on the TCS-X laser
23:43 (16:43) Jason – Out of LVEA – TCS-X laser has been restarted
00:05 (17:05) Rick S. and crew – Out of the LVEA
01:18 (18:18) HAM5 ISI and SRM WDs tripped. – Perhaps commissioning activities 
03:47 (20:47) Sheila & Terra – Going to ISCT1 to align camera
05:10 (22:10) Sheila & Terra – Out of the LVEA
05:15 (22:15) Jeff – Into the LVEA to check doors and run particle counts
05:25 (22:25) Jeff - Out of the LVEA

Title: 08/16/2016, Evening Shift 23:00 – 07:00 (16:00 – 07:00) All times in UTC (PT)
Support:  Sheila, Jenne, Terra 
Incoming Operator: N/A

Shift Detail Summary:  The commissioners spent the shift working stability and robustness of the IFO. 

   There were high particle counts recorded on both dust monitors (Beirgarten and at HAM6) and in the PSL Anti-Room starting at 09:30. The high counts were mostly in the 0.3um particle sizes. Elevated counts were not recorded in the PSL Laser room. Counts were tapering off by the start of the evening shift and by shifts end had returned to somewhat normal levels. Have not been able to determine the source, yet.   

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. 

PSL model changes. WP6084

Ben, Jim, Dave:

Three psl models were changed today:

h1ioppsl0: Had the new Contec 6464 binary IO card added.

h1pslpmc: Removed its grounding of the last four DAC channels, these channels will now be used by the new outerloop system

h1psliss: added the new outerloop test code for this week's chassis install and test by Ben. Current code just monitors the ADC input channels and writes them at 2kHz to the commissioning frame. I permits the four DAC channels to be driven by filter modules, it provides binary control and monitoring of the eight BIO channels.

I have created a simple MEDM and attached itto the site map (PSL -> 'ISS BEN TEST').

We anticipate more h1psliss code changes as this commissioning progresses during the week.

New GDS code

Jim:

please see Jim's alog.

Reboot h1guardian0

TJ, Dave:

h1guardian0 was rebooted after running 29 days. The loading came down a bit but starts off in the mid-20s.

New digital video camera

see today's alog for details

Wind gust meter attached to h1pemex

Jim W, Jim, Fil, Richard, Dave:

LHO's Young ultrasound 3d anemometer was attached to three spare ADC channels on h1pemex. The channels are ADC_0_12,13,14.

Frame Writer Code Testing

Jonathan:

New daqd code was tested on h1fw0. The new code has been left running.

Beckhoff C1-PLC1 code change

Daniel:

please see Daniel's alog

DAQ Restart

Daniel, Dave:

DAQ was restarted to sync to new h1psliss channels and the latest Beckhoff h1ecatc1plc1.

   After running a low battery shutdown test, dust monitor #7 has been removed from the LVEA. 

Isolated pump carts from HAM5/HAM6 annulus system but leaving carts running.  AIPs were started earlier in the day and pump currents look low enough as to not need assistance -> Will shut down 2 of 4 running pump carts in the morning if not needed.  Other pump carts will need to run until Friday morning judging from current data

TITLE: 08/16 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: Jeff
SHIFT SUMMARY: Pretty busy mintenance day. Much more than I expected at least. TCS crew is still working on diagnosing TCSY, commissioners are trying to lock without disturbing them too much.
LOG:

• 14:00 Chris C to both ends for work in the fan rooms.
• 15:08 Bubba to LVEA t ofind 3IFO parts
• 15:13 Ed M in and out of LVEA at SUSR3 (WP#6074)
• 15:35 Christina & Karen to ends
• 15:37 Richard to LVEA table camera work
• 15:49 Fil to LVEA t odo cabling over HAM1 and HAM4 (WP#6086)
• 15:50 Corey to LVEA for ISCT1 camera work (WP#6071)
• 16:02 John, Bubba to LVEA
• 16:12 Jason, Alastair to LVEA TCSY work (WP#6083)
• 16:16 Richard to LVEA to Corey
• 16:20 Guardian reboot
• 16:46 Hugh starting HEPI WP work in CS mech room (WP#5986)
• 17:01 Joe to LVEA
• 17:02 Gerardo to LVEA starting cable pulling (WP#6089)
• 17:05 Norco at the gate
• 17:05 Corey out
• 17:12 Vern, Alastair, Jason to LVEA looking at TCS inventory
• 17:14 Joe out
• 17:52 PSL FE restart (WP#6084)
• 17:56 Joe to all out buildings
• 18:00 Marc to Ends for CPS timing update (WP#6092)
• 18:09 Rich, CJ to LVEA for PCal ITMX pictures (WP#6078)
• 18:38 Jim W, Ian to EX for annemometer work
• 18:45 Hugh to end stations for HEPI maintenance
• 18:51 Marc back from ends
• 18:57 Joe back
• 19:05 Jim W, Ian back
• 19:13 Jason, Alastair out for lunch
• 19:20 Hugh back from end stations
• 19:30 Gerardo out
• 19:47 Mike and guest into LVEA for tour
• 19:53 Richard to LVEA to Fil
• 19:54 Ben Abbot to LVEA to PSL rack
• 19:56 Richard out
• 20:10 Rick, CJ to LVEA to PCal ITMX
• 20:12 Fil out
• 20:38 PSL tripped off
• 20:46 Mike, guest out
• 21:09 Fil to CER (WP#6034)
• 21:15 Dave, Jim back from EX
• 21:24 Ben to LVEA to PSL racks
• 21:43 Jason back out to TCSY
• 22:24 Kyle to LVEA to get temps for vertex RGA
• 23:02 Fil back out to check on magnetometer near HAM2

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.

The PSL power watchdogs tripped at 20:38:13 UTC (13:38:13 PDT).  The cause appears to be the NPRO turning off.  In the attached trend the NPROOK channel, which monitors if the NPRO is working or not. goes to zero (indicating the NPRO turned off) at 20:38:08 UTC, 5 seconds before the power watchdogs trip.  The cause of the NPRO turning off is currently unknown.  I am bringing the PSL back up.

The OMC alignment servos keep turning on, even though the OMC guardian is paused.  I found that it gets turned on in engage_wfs_centering whenever we do any ASC since it's in a generate states function.  So, I have commented out that line, but we must uncomment it when we have the OMC back and are ready to use it again.  It is currently line 113 in ISC_GEN_STATES.