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.

Hoping for a light Maintenance (since many activities done yesterday) & aiming for ending at noon.  Cheryl handed over a locked H1 & it stayed locked for quite a while into Maintenance before dropping out....

H1 PSL appeared to trip (causing lockloss).  Peter & Jeff B addressed and are looking into why it dropped out.

I have added MEDM overview screens for H1 SUS ETMX, ETMY to the CDS web screen shots pages. 

This morning when the interferometer was down, I went to the ISCT6 table and removed the temporary digital camera or CAM17 (that was for the SRC Gouy phase measurement, see for example 29389). The beam for this camera is currently dumped by an additional razor blade dump on the table. The ethernet cable was re-routed and plugged to the OMCR camera which is the nominal cabling configuration. Additionally, I have left the base plate for the camera untouched in case we want to revisit the same measurement.

State of H1: locked in NLN in Observe

Commissioners: Sheila, Jenne (early in the shift)

Activities:

• Initial Alignment
• locked in DC Readout
• damping Bounce, Roll, and Violins
• lockloss before Noise Tunings
• relocked
• back to DC Readout
• some damping
• on to SRM_ASC_HIGH_POWER
• Noise Tunings by hand, line by line (see previous alog)
• Manually to NLN
• Manually set IMC_LOCK to ISS_DC_COUPLED
• Observe
• had to change phase on PI mode 28, kept H1 in Observe (see previous alog)

Violin Mode Damping:

• ITMX violin mode1 likes +60deg in phase, not in quardian

• 15:20UTC (707:20PT) Vendor #1 arrives: Paradice Water

Noise Tunings:

• I took snapshots of my guardian terminal and another therminal where I executed the command "date" after each Noise Tunings command, however I started that about command 12, so guardian commands and data commands match if you start at the end of the files and go backwards

a2l:

• started at: Tue Nov 29 06:02:59 PST 2016, 14:02:59UTC
• ended at: Tue Nov 29 06:07:49 PST 2016, 14:07:49UTC

Observe:

• H1 in Observe, on hold, IMC ISS is not decoupled

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.

Following up on the DetChar report of ETMx oplev laser glitching causing problems, I confirmed (using the DetChar summary pages) that the laser was indeed showing signs of glitching.  I also noticed the ETMy laser was also showing signs of glitching.  I increased the power for both lasers to hopefully get them into a thermal state they are happy with.  I used the Current Monitor (outputs a voltage to monitor the current delivered to the laser diode) port on the back of each laser as a guide.  The changes were:

• ETMx
  • Current Monitor Before: 0.814 V
  • Current Monitor After: 0.830 V
• ETMy
  • Current Monitor Before: 0.861 V
  • Current Monitor After: 0.880 V

Seeing as I had to open the cooler for both lasers they will both need 4-6 hours to return to thermal equilibrium.  At that point a determination can be made as to whether or not this helped at all.  The attached 3 hour trend of the oplev SUM for both optical levers gives hope; after the power increase the SUM signal is quieter for both oplevs.  I will leave WP 6348 open for now as more adjustment may be necessary to fix the glitching.