J. Kissel, T. Sadecki, B. Weaver

Betsy, Travis, and I have measured the standard top2top transfer functions for ITMX, BS, ITMY. 
They are all clear of rubbing and we ready for doors on tomorrow. Wahoo! 

Attached are processed transfer functions.

Note, for those who have doubts:
Some of the 1st (lowest frequency) fundamental modes appear a little bit squashed, but I'm confident that this is lack of coherence in the measurement: the BSC-ISIs are only damped with HEPI locked, it's a little windy out this evening (~20 mph), and the purge air is running full blast. A little difficult for the OSEMs to drive the whole suspension (i.e. the mode shapes for these lowest frequency modes) above that residual seismic noise. No reason to not put on doors, but we'll check again, as always.

Data files live here:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGM0/Data/
    2017-12-19_2314_H1SUSITMX_M0_WhiteNoise_L_0p01to50Hz.xml
    2017-12-19_2314_H1SUSITMX_M0_WhiteNoise_P_0p01to50Hz.xml
    2017-12-19_2314_H1SUSITMX_M0_WhiteNoise_R_0p01to50Hz.xml
    2017-12-19_2314_H1SUSITMX_M0_WhiteNoise_T_0p01to50Hz.xml
    2017-12-19_2314_H1SUSITMX_M0_WhiteNoise_V_0p01to50Hz.xml
    2017-12-19_2314_H1SUSITMX_M0_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGR0/Data
    2017-12-19_2317_H1SUSITMX_R0_WhiteNoise_L_0p01to50Hz.xml
    2017-12-19_2317_H1SUSITMX_R0_WhiteNoise_P_0p01to50Hz.xml
    2017-12-19_2317_H1SUSITMX_R0_WhiteNoise_R_0p01to50Hz.xml
    2017-12-19_2317_H1SUSITMX_R0_WhiteNoise_T_0p01to50Hz.xml
    2017-12-19_2317_H1SUSITMX_R0_WhiteNoise_V_0p01to50Hz.xml
    2017-12-19_2317_H1SUSITMX_R0_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/BSFM/H1/BS/SAGM1/Data
    2017-12-18_1946_H1SUSBS_M1_WhiteNoise_L_0p01to50Hz.xml
    2017-12-18_1946_H1SUSBS_M1_WhiteNoise_P_0p01to50Hz.xml
    2017-12-18_1946_H1SUSBS_M1_WhiteNoise_R_0p01to50Hz.xml
    2017-12-18_1946_H1SUSBS_M1_WhiteNoise_T_0p01to50Hz.xml
    2017-12-18_1946_H1SUSBS_M1_WhiteNoise_V_0p01to50Hz.xml
    2017-12-18_1946_H1SUSBS_M1_WhiteNoise_Y_0p01to50Hz.xml


/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMY/SAGM0/Data/
    2017-12-20_0459_H1SUSITMY_M0_Mono_WhiteNoise_L_0p01to50Hz.xml
    2017-12-20_0459_H1SUSITMY_M0_Mono_WhiteNoise_P_0p01to50Hz.xml
    2017-12-20_0459_H1SUSITMY_M0_Mono_WhiteNoise_R_0p01to50Hz.xml
    2017-12-20_0459_H1SUSITMY_M0_Mono_WhiteNoise_T_0p01to50Hz.xml
    2017-12-20_0459_H1SUSITMY_M0_Mono_WhiteNoise_V_0p01to50Hz.xml
    2017-12-20_0459_H1SUSITMY_M0_Mono_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMY/SAGR0/Data
    2017-12-20_0055_H1SUSITMY_R0_L_WhiteNoise_0p01to50Hz.xml
    2017-12-20_0055_H1SUSITMY_R0_P_WhiteNoise_0p01to50Hz.xml
    2017-12-20_0055_H1SUSITMY_R0_R_WhiteNoise_0p01to50Hz.xml
    2017-12-20_0055_H1SUSITMY_R0_T_WhiteNoise_0p01to50Hz.xml
    2017-12-20_0055_H1SUSITMY_R0_V_WhiteNoise_0p01to50Hz.xml
    2017-12-20_0055_H1SUSITMY_R0_Y_WhiteNoise_0p01to50Hz.xml

Team left for the day after not getting very far in this alignment.  Peter King worked on it this am, then handed to Jason and Sheila.  Team is reconvening with the addition of Jenne and Rick tomorrow at 8am.

Today, Travis and I worked to closeout BSC 3 to finish out the set of chambers needing doors put on.  We:

• Pulled FC from CPX-AR, which needed a second paint job since there was some small bits left in the center of the optic from the first pull.  The second paint-and-dry was successful.  The usual N2ionizing blow was used
• Painted and pulled FC on the ITMX-HR which came off clean.  The surface looked good considering we were inspecting with laser goggles on (same for the CP above).
• Ran a few TFs - discovered major rubbing somewhere.  A few hours of troubleshooting later and we finally found the ring heater structure cable pushing on the main chain UIM.  That alleviated and the TFs all look great.
• For whatever reason, the ITMX needs ~+300 bias to get back on the oplev.  Not sure what that means, but at least we're still on the slider.
• Jim unlocked the ISI - his TFs look good.
• Added witness wafers and 1" optics where they should be: 1 vert on QUAD, 1 horiz under QUAD, 1 horiz under ACB in tube.
• WIped floor and surfaces many times throughout the day.
• Finished full round of high res TFs with Travis and Kissel - will post in coming days.
• Shopped around for all subsystem signoffs to put doors on.  Waiting for Kissel, but all looks good.

The second NEG pump of three was installed this morning on the H-1 output mode cleaner tube.

Ed, Sheila, Hugh

Today I removed the following from HAMS 2&3: ( all iris positions were photographed for convenient visual reference)

• MC1 iris (HAM2)- added an upside down dog clamp to mark position. Removed iris/post/fork w/bolt
• MC2 iris (HAM3)- removed the combination of fork clamps/spacer (w/bolt) that were constructed to hold the post. Left the upside down dog clamp installed.
• MC3 iris (HAM2)- 2 photos were taken of this position and no extra markers were added as it sits centered on a table line in front of it's baffle aperture. Iris/post fork clamp w/bolt removed
• MC3 Trans iris (HAM2)- 2 photos were taken of the two dog clamps used to position the fork/bolt was removed and the two upside down dogs remain.
• PRM iris (HAM2)- multiple photo angles were taken as this post doesn't center on anything of significance and getting an upside down clamp wasn't doable. Iris/post fork clamp w/bolt removed

I got approval from Sheila and Hugh to leave the marker (xxxx640 type) for MC1 iris. It was the only other position that I could fit a clamp against.

The half-wave plate was still in-chamber when I left the area. It will come out as well. ISS work in that area of the table and too many bodies prohibited me removing it at this time. Sheila may have removed it. If not, then I will in the morning.

TITLE: 12/20 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Still trying to close up, but getting closer.
LOG: (See attached)

After the ISC crew cleared the debris, and after scanning the table and wiping horizontal surfaces, removed one 1201 (50g) to give a slightly better float tilt.  Lock/unlock shift is 8urad, -2urad, & 3urad for RX RY & RZ.  Table left LOCKED.

Dan, Dave:

After sending all the system logs from raid-msr-e18-0-0 to Nexsan, Dan managed to clear the fault by performing a reset of controller-0. The system correctly failed over to the backup controller-1 and sent emails to sysadmin.

The vague controller-0 hardware fault occurred sometime on Saturday (12/16) and was reported in the daily status emails, but was not emailed at the time of the failure. This is a bug in the system since we have subscribed to all alerts.

Betsy called me out after they were done in BSC3, so I went out and unlocked the ISI, the shifts from the locked position are pretty good, considering the new optic. I've now taken tfs, they look okay with the typical caveats about in air measurements, with people working nearby. First attached plot shows the ST1 L4C tfs, second plot shows the ST2 GS13 tfs. ST2 resonances are a little fuzzy, ST1 resonances are pretty clean.

Sheila, Robert, Jenne

This morning Sheila and Robert confirmed that the IMs were aligned with the flashing IMC beam, and that the beam went through the irides near PRM and PR2. 

We then determined that the DAC output of IM4 was unacceptably high (actually, we were railing it in order to get the beam aligned through the irides).  Sheila loosened IM4's clamps and rotated it in yaw a bit, and tightened it back up.  She then adjusted the pitch adjustment screw.  After each adjustment we realigned the beam onto the PR2 iris to check the size of the DAC output.  In the end, the largest DAC counts on IM4 are less than 50k, which is hopefully acceptable.  IM2 has larger DAC counts (up to 71k), but we think that should be fine since IM2 isn't used for as much steering as IM4 is.  IM1 and IM3 have smaller maximum DAC counts.  I attach a screenshot so we remember what our in-air situation was, for next time we vent.

   All three dust monitor vacuum pumps check out OK. Temps are good. Made slight adjustment to vacuum pressure at End-X. No other adjustments needed. End-Y is a bit noisy and there is carbon dust (from vanes) on the muffler. There is a standby pump staged at End-Y should this pump fail. 

  

Whilst preparing to look at the beam headed towards the ISS photodetector array, we noticed that the
MC2 trans signal fluctuated whenever the Y-arm crane was activated (and/or was in motion).

    The really spikey section of the attached plot is when the shutter was opened to admit light.




  Jason/Peter

This morning I completed the weekly PSL FAMIS tasks.

HPO Pump Diode Operating Current Adjust (FAMIS 8453)

With the ISS OFF, I adjusted the operating current of the HPO DBs.  The changes are summarized in the below table and a screenshot of the main PSL Beckhoff screen is attached for future reference.

I did not adjust the operating temperatures of the HPO DBs.  The HPO is now outputting 155.2 W and the ISS is back ON.  This completes FAMIS 8453.

PSL Power Watchdog Reset (FAMIS 4024)

I reset both PSL power watchdogs at 18:54 UTC (10:54 PST).  This completes FAMIS 4024.

It seems that when the modifications were done to this particular chassis, there was an accidental swapping of wire harnesses when reassembling that was causing the team som difficulty. The swap I found was at the ISI Coil Driver Chassis Interface Board, connectors P6 and P9, which would swap the Coarse/Fine 1 & 2 Coil Driver Output signals. The unit was reinstalled and I'm waiting to hear the results of this correction.

Calibration lines that are continuously injected in the interferometer are used to estimate time varying factors of calibration model which are in turn are used to correct h(t) in GDS pipeline. Since the calibration lines are of finite height, whenever there are strong glitches in the interferometer data the estimated time varying factors tend to be corrupted. To avoid these glitchy times, a threshold is used on the coherence based uncertainties at calibration line frequencies (using coherence between injected signal and DARM error).  For C00 and C01, at LHO we used a maximum threshold of 0.4 %. The attached plot show the distribution of estimated uncertainties at various calibration lines during all of O2 (only observation intent times were used). We see that 0.4% is a little bit low, especially for PCal line 2 (331.9 Hz). From the plot, it seems any value above ~0.6%, outside the peaks of the distributions, will work fine. But we also don't want to go too large otherwise it would defeat the purpose avoiding glitchy times. At LLO we use a threshold of 2%. Since 2% satisfy our requirement of > 0.6% and also makes the thresholds between the two sites consistent, we could use 2% threshold for LHO also (for C02).

Was able to get ITMY tfs this morning. The stage 2 resonances are not super clean, but I'm think that's just because we are in air. Otherwise, looks okay.

The LVEA has been to transitioned to Laser HAZARD by Peter King.

Got the ClassA blanks installed and torqued down to 140" lbs.  I can still see copper so they are not metal to metal yet.  I was getting gun shy on the bolts and these will be replaced with the actual fiber feedthrus before a potential leak might be found or maybe even matters.

Trying to get close out tfs on BSC 2 and it appears the Corner 3 actuators are all swapped around. The H3 to H3 l4c/gs13 tfs for both stages look bad, but the H3 to V3 l4c/gs13 tfs look okay. I looked at the cables out of the coil drivers and the order of the labeling is the same for all 3 drivers, so I would guess that some work was done on the outside of the chamber and the cables weren't hooked back up correctly. First attached plot is the St2 tfs (with the cross-over tfs for corner 3), second shows the St2 corner 3 tfs, H3 to H3/V3 gs13s, V3 to H3/V3 tfs. The better looking tfs are H3 to V3 and V3 to H3, the crappy looking ones are H3 to H3 and V3 to V3. The St1 tfs are similarly confused, see third plot.