This afternoon, Dave reattached the SDF status to the INTENT bit via the Guardian IFO node.  Jenne, Hugh, Kissel, Sheila and I then cleaned house on the SDF in order to make sure everything was green.  The operators should now be able to hit the intend bit tonight as needed.  If not, figure out what SDF diff is blocking it and either determine to accept or not-monitor it.  Please alog any such changes.  In the coming days, we will switch all SAFE files in use on the SDF to OBSERVE files so that the full screen shows all OBSERVE files in use when the intent bit it set.

TITLE: 11/29 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Preventitive Maintenance
INCOMING OPERATOR: Jim
SHIFT SUMMARY:

Cheryl handed over an H1 in NLN, and we actually stayed locked until 9:10am (17:10utc).  We had a fairly light Maintenance Day & ended by noon.  Then we transitioned to locking up H1 for injection & other work on H1.  After a few tweaks by Jenne, we made it to NLN with no issues.  On DIAG_MAIN, we have the "IM2 Y out of range" note.

LOG:

• Maintenance Day ended at around noon.
• Spent time (1) measuring Dark Offsets, & (2) phasing POP90 (Jenne)
• Went through Locking steps to find where the ASC 1.8Hz oscillation develops (Sheila)
• Made it to NLN.  Ran an A2L.
  • kiwamu opened ALS shutter for measurements
  • sheila working on ASC loops
  • robert running rf injections
• Remote Access for Terra & Evan (Patrick took care of this)

I see now Jim had already plotted most of these yesterday but since I had already wrote this log, I thought i should post it anyway. My explainations and plots are better anyway.

The two attached plots show 2 months and 7 days of a number of the status channels from the BRS for diagnosis.  On the 7 day plot, the large steps up on the DRIFTMON (upper left) are when Jim opened the BRS box on Thursday and when I opened it yesterday--this is a thermal step and recovery.

The CBIT indicates if the C# code is running. This code reads the camera light image.

The AMPBIT is an indication of the BRS Beam swing amplitude--looking at the 60 day image indicates the PEM crew really got the beam disturbed as it has not been in the past 60 days until last Wednesday. Jim plots 90 days and shows this happened ~21 Sept but things did not get out of whack as it did last Wednesday.

The drop outs (to zero) of the CBIT and CAMERA channels are indications of stopping the code as we attempt to get it running again.

The BOXBIT logics from 1 when the Beckoff communications to the BRS box are disrupted.  Not sure why it occurred for Jim and on 8 Nov (no log spotted) but not for me yesterday.

The DAMPBIT just indicates the set point enabled damping has kicked on.

The LIGHTSRC and MODBIT are not included in these plots as they were unity for the duration indicating the light source has been fine and the ISI is communicating without problem.  I expected to see a DRIFT_BIT channel but it remained ellusive.

(Sheila Daniel)

Concerning alogs 31573 and 31679, and FRS 6787.

Increasing the thresholds didn't work because the tidal system is engaged, when we are first locked on RF at the AS port which is before the CARM reduction. At this stage the thresholds need to be small, since the arm power is still low. It won't trigger later because we loose the ALS. So, we made a change to guardian to increase the ON/OFF thresholds to 8000/4000 (from 30/10) at the same time that we change the NSUM whitening gains (which is after CARM reduction). They are reset in the down state. We also removed the 3 sec ramp time from the NSUM filter modules. They introduced a false down transient in the arm powers. Without the ramp it will now produce a false up transient.

At the moment these thresholds are optimized for a 2W lock. A further improvement could be to scale them with input power.

The attached plots shows the power readbacks of the HPO:

• PWR_HPL_DC (after HPO): Looks reasonable for most of the frequency range. ADC limited >5kHz.
• OSC_PD_INT_DC (internal): Looks reasonable for frequencies below 1kHz. ADC limited >1kHz.
• OSC_PD_ISO (small, wrong polarization): Not useful above 50Hz.
• OSC_PD_BP (don't know what it measures): isn't ADC limited.
• OSC_PD_AMP (after 35W amp): On the one hand, at low frequencies the RIN is below the HPO readbacks as expected; on the other hand, it isn't between 1 kHz and 4kHz. Looks contaminated.
• OSC_PD_*_AC: nothing useful, not even correlated to corresponding DC channels.

The RIN calibration was obtained by dividing by the corresponding DC value. 

Figure 1 shows the “before” to “after” improvement in DARM. In addition, the figure shows the large decrease in jitter in the IMC WFSs. Both are included because the coupling to DARM varies, but the jitter signal is consistent. 

Figure 2 shows the original and the new mounts for the piezo mirror. The main mechanical changes are: 1) the collar is glued into the U200 mount instead of pressed by the usual single set screw. This stiffens the pitch and yaw motion of the piezo and collar around the connection to the U200 mount. 2) I added a “flying buttress”, bolted to the alternate U200 connection point on the side (inset photo). This is to stiffen and damp the pitch and yaw degrees of freedom around the single connection screw between the U200 mount and the base. 3) I added damping material to the new mount. 4) We shortened the lever arm of the massive mirror, while keeping the mirror in the same place, by moving the U200 attachment point forward to an alternate threaded hole in the base.

The main resonance moved from 260 to 350 where it overlapped with the largest resonance of the top periscope mount, so we brought it back down about 15 Hz by adding moment of inertia with damped clamps. It is now much damped and lying on top of one of the lower amplitude modes of the top mount.

In addition, we noticed that the beam was very close to the edge of the safety tube (second page of Figure 2). We moved the beam further from the edge by reducing the length of the tube by a couple of inches (the tube is angled relative to the beam) and by shimming the inner tube in the telescoping assembly. We replaced the white clean room tape, that was locking the telescoping assembly, with Kapton tape. The safety tube is a couple of inches shorter but still extends over the edge of the table (see figure).

Kiwamu I., Rick S., Robert S.

Betsy, Keita, Daniel

As part of the LVEA sweep, prior to the start of O2, this morning, we spent over an hour doing a cleanup of misc cables and test equipment in the LVEA and electronics room.  There were quite a few cables dangling from various racks, here's the full list of what we cleaned up and where:

I also threw the main breaker to the OFF position on both of the free standing unused transformer units in the LVEA - one I completely unplugged because I thought I could still hear it humming.

No monitors computers appear to be on except the 2 VE BECKHOFF ones that must remain on (in their stand alone racks on the floor).

We'll ask the early morning crew to sweep for Phones, Access readers, lights, and WIFI first thing in the morning.

Maintenance Log:  7:20am - 12:06pm

• 15:20 Paradise Water on site (noted by Cheryl)
• 16:10-17:55 Joe to MidY
• 16:15 Ken on Elec mez
• 16:40 & 17:24: LN Trucks for EX & MX (gone by 18:30?)
• 16:47 Bathroom contractor
• 16:50-19:43 Clean Up & BSC8 work (Kyle)
• Transitioned EX & EY to NO BRS
• 17:00-done Matlab down 20min (Carlos)
• 17:01-done ALS shutter open (kiwamu)
• 17:05-17:18 EX oplev work (jason)
• 17:08-17:40 EY Patch Panels & turned off phones/wifi (fil)
• 17:12 PSL Trip & lockloss, restored at 18:10 (Peter, Jeff B)
• 17:18-17:  EY oplev work (jason)
• 17:21-done isct6 camera removal (kiwamu)
• 17:28 End Station cleaning (chris/karen)
• 17:45-18:12 EY HEPI fluid check (Hugh)
• 18:00-19:30 EX Patch Panels & turned off phones/wifi (fil)
• 18:05-19:38 POP90 chasis (Richard)
• 18:18 LVEA cleaning (christina, karen)
• 18:33-19:00 LVEA tour (vern)
• 18:50 PEM clean-up & Tues Inj set up at LVEA & EY (robert)
• 18:53 Dropping off filter boxes at each fan room (Chris)
• 19:17-19:48 Checking curtain clearance on HEPI (Hugh)
• 19:25 3IFO walkaround (Bubba)
• "Fast Shutter HV" message on DIAG_MAIN--->Fil going to restart
• 20:06:  Observatory Mode Switched to Locking (from Preventative Maint)
• Working on phasing for POP90 (Jenne)

[Richard, Fil, Kawabe, Marc]

WP6362

See ALOG 31948

Replaced I&Q Demod Chassis (D0902796) S1000977 with S1001002.  We removed the 0 ohm bypass resistors from channels 1 and 2 and installed filters from the old chassis into the new chassis.

Channel 1 = MCL PLP-21.4+ (21.4Mhz Low Pass Filter)

Channel 2 = MCL PHP-100+ (100MHz High Pass Filter)

This new chassis also had the power supply cable installed upside down, we fixed this.  The +15V LED lead was not fully seated into the connector housing, we fixed this as well.

We do not have spare filters in stock or we would have replaced these, Fil will order some replacements.

Kyle R., Gerardo M., Richard M. 

(completes WPs #6332 and #6360)

Initial pressure indication shortly after being energized was 3 x 10-3 torr (PT180 is a "wide-range" gauge).  If real, this would be higher than expected for the ~17 hrs. of accumulation -> "burped" the accumulated gas into the connected pump setup while Gerardo monitored its pirani gauge -> it gave no indication of a change and remained steady at 1.9 x 10-3 torr which is as expected.  Neither gauge is calibrated in this pressure region of interest.  Noted PT180 responded as expected to being combined with local turbo -> Isolated temporary local pump setup, valved-in (exposed/combined) PT180 to site vacuum volume, vented locally mounted turbo and removed from PT180 hardware -> Installed 1 1/2" O-ring valve and 2.75" CF to NW40 adapter in place of the turbo and pumped to rough vacuum the space between the two 1 1/2" pump port valves.  

I was informed that the laser had tripped this morning.  Not sure exactly why the laser tripped as TwinCAT indicated
that the EPICS alarm was triggered.  At first glance it looks like the flow in head 3 caused the trip.  It reached
the trip value (0.4 lpm) roughly 2 seconds before heads 1 and 2.

    Attached are other trends of the laser power(s) versus the flow rate in head 3.  There is some evidence to
suggest that the NPRO might have tripped first, triggering the power watchdog for the front end (mis-named
Head2NPROa.png).

Summary:

Average range: 70 Mpc

Duty Cycle: 35% (commissioning activities reduced observing time)

1080Hz glitching continuing

Mysterious noise at 10-30Hz for ~2 hours on Tuesday (22nd)

Hardware injections during observing time on Wednesday (1 CBC, 10 detchar safety injections)

Full DQ Shift report: https://wiki.ligo.org/DetChar/DataQuality/DQShiftH120161121

Added error channels to help address issue reported in alogs 31910 and 31912. Also added all pressure gauges and updated guidance text.

Completes WP 6358.

Significant exhaust temperature response (<-30C) 47 seconds after changing the manual mode %open value of the LLCV (liquid level control valve) from its as-found valve of 17 to 50 -> restored this value back to 17 following this exercise.