J. Kissel

In order to complete the characterization of the new H1SUSITMX fiber suspension's violin modes while they're now at vacuum, I began driving the PUM stage in Pitch looking for resonances in the L2 OSEMs and the ITMX optical lever in PIT or YAW. I've found nothing. Sadly, the OSEMs are no help, at a sensitivity of ~2e-10 m/rtHz or ~1e-9 rad/rtHz at the fundamental frequencies of the violin modes (~500 Hz), and the optical lever is not that much better at 5e-12 rad/rtHz. My guess is that even the most excited violin modes don't get up past ~1e-15 rad/rtHz.

Sadly, both of these channels are only stored at 256 Hz, so we can't envoke the DetChar / CW groups to run some insanely long FFTs to find them either. All tests done today were with the test point versions of the channels.

I drove awggui with the attached settings (sweeping through the elliptic bandpass' frequency from 500 Hz to 505 Hz with a 1 Hz window at a time, though I started with much broader band passes, 490-515, then 500-505 Hz), and measured the ASD of the above mentioned sensors, looking for coherence between excitation and sensor. Nothing.

The frequencies are motivated by the in-air measurements from LHO aLOG 39135.
Remember, there's a proposal on the table (G1701332) to tailor the frequencies of the violin modes to make them more easily identifiable and to reduce the amount of damping filter commissioning time.
The hope here is to find out what these new at-vac mode frequencies ASAP such that we understand how the evolve from AIR to VAC, with the end goal of being able to predict the mode shift well enough to chose fibers from their in-air measurements.

Advice on how to find these with what limited sensors I have is welcome. 
Otherwise, we'll have to wait until we get some semblance of an IFO up and running -- hopefully a DRMI will be sensitive enough.

TITLE: 01/05 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: Back to laser Hazard in the LVEA. CDS cabling work continues and so does IMC work.
LOG: (See attached for long log)

J. Kissel

Wrapping up the core optic suspensions standard rubbing check top-to-top transfer functions after pump down, I've measured the main (M0) and reaction (R0) chains of H1SUSITMX and H1SUSITMY. 
ITMX looks great and free of rubbing, no "ifs," "ands," or "buts".
ITMY shows poor response / low coherence in both main and reaction chain vertical.

Conclusion: (albiet a weak conclusion) I suspect something is awry with the ITMY M0 (LF RT) / R0 (LF RT) OSEM signal chain, with a slight preference toward it being a drive problem. I *hope* that it's an external-to-chamber problem.  More discussion below. 

Attached are the results.

Discussion of ITMY:
- Start with the comparison between previous measurements, allquads_2018-01-05_H1SUSITMY_All_Phase3b_ALL_ZOOMED_TFs.pdf, and flip to pages 3, 9, and  10 for the M0 V to V, R0 V to V, and R0 R to R. 
NOTES: 
    - These are particularly low coherence, and these are driven with the same excitation amplitude as ITMX. 
    - I tried to drive harder, in case the templates were tuned for some other configuration, and it saturates the DAC, so the templates *are* well tuned. 
    - As per normal, I was in the top coil driver state 1, i.e. that with the low-pass OFF, and therefore the most DAC range.
    - Also, there are features in the R0 R to R transfer function at 1.11 1.70 2.82 4.52 5.90 (+/- 0.01) Hz that don't correspond to any other DOF's resonances for either chain.

- Next look at the individual measurements detailed TF analysis, 2018-01-05_1944_H1SUSITMY_R0_ALL_TFs.pdf. Pg 3 and 4 are repeats of what you've seen, but 
NOTES: 
    - on pg 7 (L to V), pg 9 (R to V), pg 11 (P to V) which show the "expected" or "interesting" cross-coupling between the vertical DOF and others, one sees pretty good reciprocity. I.e. we see that what features and frequency response shape are seen in the V to ? TF are also seen in the reciprocal ? to V transfer function. This is evidence toward the sensors/electronics being a problem and not the suspension's dynamics. Admittedly, the P to V and V to P TFs look the least alike. These TFs *have* changed from the previous at-vacuum measurement of this suspension (see 2017-07-20_2358_H1SUSITMY_R0_ALL_TFs.pdf from LHO aLOG 37848), but it's unclear if one could claim that one was "better" or "more right" than the other.
    - on pg 15 (V to LF RT) and 16 (R to LF RT), one can see that both sensors are showing the same response to the drive (as was true in 2017-07-20 data set as well), but it just looks over all weaker. This implies that it's a *drive* electronics problem, not a *sensor* electronics problem.

A final note: other than
    - Aligning / Rebalancing the Reaction Chain,
    - Installing BRDs & NMBDs on the Main Chain, and
    - Resolving all in-vac cable grounding issues
we did comparatively little to this suspension.

Following all these clues, I was perusing aLOGs to see if I could find any hanging chads regarding the cable grounding issues, and found LHO aLOG 39675, but 
    (a) Those cables in question for ITMY were for R0's (F1 F2 F3 SD) and PUM (UL LL UR LR) signal chains, *not* for those involved with these transfer functions, namely the M0 (LF RT) / R0 (LF RT) signal chain, and
    (b) Richard assures me that *every* grounding issue in that aLOG was resolved (confirmed quickly by Besty in passing by LHO aLOG 39749)

As a final test, I ran the R0 V to V transfer function with all DOF's damping loops CLOSED -- see 2018-01-05_2214_H1SUSITMY_R0_V_Damped_WhiteNoise_0p01to50Hz.png for the results (BLACK is the 2017-12-20 data set, MAGENTA is the latest 2018-01-05 undamped data set shown the analysis .pdfs, and RED is the damped data set).
The only major difference (besides the -- surprisingly in-effective -- reduction of the primary vertical modes), is that the extra 1.11 1.70 2.82 4.52 5.90 (+/- 0.01) Hz features are reduced to the in-air 2017-12-20 level.

Measurement Templates:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/
ITMX/SAGM0/Data/2018-01-05_1828_H1SUSITMX_M0_WhiteNoise_L_0p01to50Hz.xml
ITMX/SAGM0/Data/2018-01-05_1828_H1SUSITMX_M0_WhiteNoise_P_0p01to50Hz.xml
ITMX/SAGM0/Data/2018-01-05_1828_H1SUSITMX_M0_WhiteNoise_R_0p01to50Hz.xml
ITMX/SAGM0/Data/2018-01-05_1828_H1SUSITMX_M0_WhiteNoise_T_0p01to50Hz.xml
ITMX/SAGM0/Data/2018-01-05_1828_H1SUSITMX_M0_WhiteNoise_V_0p01to50Hz.xml
ITMX/SAGM0/Data/2018-01-05_1828_H1SUSITMX_M0_WhiteNoise_Y_0p01to50Hz.xml

ITMX/SAGR0/Data/2018-01-05_1923_H1SUSITMX_R0_WhiteNoise_L_0p01to50Hz.xml
ITMX/SAGR0/Data/2018-01-05_1923_H1SUSITMX_R0_WhiteNoise_P_0p01to50Hz.xml
ITMX/SAGR0/Data/2018-01-05_1923_H1SUSITMX_R0_WhiteNoise_R_0p01to50Hz.xml
ITMX/SAGR0/Data/2018-01-05_1923_H1SUSITMX_R0_WhiteNoise_T_0p01to50Hz.xml
ITMX/SAGR0/Data/2018-01-05_1923_H1SUSITMX_R0_WhiteNoise_V_0p01to50Hz.xml
ITMX/SAGR0/Data/2018-01-05_1923_H1SUSITMX_R0_WhiteNoise_Y_0p01to50Hz.xml

ITMY/SAGM0/Data/2018-01-05_1828_H1SUSITMY_M0_Mono_WhiteNoise_L_0p01to50Hz.xml
ITMY/SAGM0/Data/2018-01-05_1828_H1SUSITMY_M0_Mono_WhiteNoise_P_0p01to50Hz.xml
ITMY/SAGM0/Data/2018-01-05_1828_H1SUSITMY_M0_Mono_WhiteNoise_R_0p01to50Hz.xml
ITMY/SAGM0/Data/2018-01-05_1828_H1SUSITMY_M0_Mono_WhiteNoise_T_0p01to50Hz.xml
ITMY/SAGM0/Data/2018-01-05_1828_H1SUSITMY_M0_Mono_WhiteNoise_V_0p01to50Hz.xml
ITMY/SAGM0/Data/2018-01-05_1828_H1SUSITMY_M0_Mono_WhiteNoise_Y_0p01to50Hz.xml

ITMY/SAGR0/Data/2018-01-05_1944_H1SUSITMY_R0_L_WhiteNoise_0p01to50Hz.xml
ITMY/SAGR0/Data/2018-01-05_1944_H1SUSITMY_R0_P_WhiteNoise_0p01to50Hz.xml
ITMY/SAGR0/Data/2018-01-05_1944_H1SUSITMY_R0_R_WhiteNoise_0p01to50Hz.xml
ITMY/SAGR0/Data/2018-01-05_1944_H1SUSITMY_R0_T_WhiteNoise_0p01to50Hz.xml
ITMY/SAGR0/Data/2018-01-05_1944_H1SUSITMY_R0_V_WhiteNoise_0p01to50Hz.xml
ITMY/SAGR0/Data/2018-01-05_1944_H1SUSITMY_R0_Y_WhiteNoise_0p01to50Hz.xml
ITMY/SAGR0/Data/2018-01-05_2214_H1SUSITMY_R0_V_Damped_WhiteNoise_0p01to50Hz.xml

This morning we removed the south door of HAM 6 and the O-Ring protector on the north side and installed viton plugs in the annuli ports to facilitate the pump down of HAM 5 doors for leak checking.  We re-installed the HAM 6 door with 4 bolts and bolted the O-Ring protector back on.

   Installed and configured dust monitor #2 at End-Y. This is located inside the cleanroom next to the BSC door. Will use the weekend data to establish the baseline for the cleanroom. 

   The Contamination Control Kit #1 has been reset and is at chamber side. 

Today I was able to get down to the lab to finish up the processing of the new AERM-06 (ETMY reaction mass replacement).  Before the corner station vent, Gerardo and I were only able to finish the LLO AERMs and part of this AERM-06.  I'll need to make time to do the ETMX one prior to needing it after the ETMY vent.

Bubba has transitioned the LVEA to laser HAZARD

Kyle and I turned on purge air skid at EY in preparation for venting Monday. 

The DAQ EDCU is currently not connecting to the two old channels on h1ecatc1plc3 (needs DAQ restart), and none of the HWS ITMY system. TJ and TiVo report that the HWS code for ITMY (which runs on h1hwsmsr1) is not stable, whereas the ITMX code on h1hwsmsr is stable. Both computers are running Ubuntu-14, albeit with slightly different kernel versions 

h1hwsmsr 3.19.0-49-generic #55~14.04.1-Ubuntu SMP Fri Jan 22 11:24:31 UTC 2016

h1hwsmsr1 3.19.0-73-generic #81~14.04.1-Ubuntu SMP Wed Oct 19 00:03:45 UTC 2016

Both models on h1susauxh56 stopped running at 15:14 PST yesterday presumably due to CER work. I restarted both models this morning to get the auxiliary data flowing to the DAQ again.

Greg, TJ, TVo

We've aligned the ITMX side and got a retro-reflection back and an image on the HWS, however, I'm not entirely convinced we're looking at the HR surface of ITMX since the beam looks smaller than it did before so we're still investigating that.   We probably still need to do more fine tune adjustment of the alignment, it's a lot harder without the green beams from the end station to help get our injection beam on-axis with the arms.

Attached are the images taken, they're in different spots because I played around with the picomotors on the periscope a bit to avoid some clipping.

TITLE: 01/05 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 1mph Gusts, 0mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.37 μm/s
QUICK SUMMARY: HAM5 HAM6 South door removal has started. Bubba transitioned the LVEA to SAFE earlier this morning.

IMC/IOT2L alignment - progress and an alignment issue to be resolved tomorrow

• the HWP was removed from the beam path into the IMC
• IMC power-in DCPD was centered
• this required moving a steering mirror and a lens in the DCPD path (bottom periscope mirror transmitted beam)
• recovery of the beam from the PSL into the IMC was not possible after those adjustments
• the rotation stage software was frozen, probably after the Beckoff reboot, and then restored
• with the beam from the PSL increased in power to ~46W, the MC2 Trans QPD was centered with the PZT (MC3 misaligned, no flashing)
• after centering MC2 Trans, there was a uniform disk of 1064nm light on the REFL path on IOT2L, but no centroid
• moving MC1 and flashing the IMC did not alter the beam on the REFL path in a significant way
• I believe the beam from MC1 is clipped in the second REFL periscope, and the uniform disk is scatter through the last baffle aperture
• a large shift in the beam from the PSL explains the alignment issues encountered today
• the plan for tomorrow:  
  • rest all optics and the PZT to known good values and align to the IMC/MC2 Trans from inside the PSL

- Jenne, Keita, Cheryl

J. Kissel

I've run detailed analysis on the post-vent transfer functions for all HSTSs -- MC1, MC2, MC3, PR2, PRM, SR2, SRM -- taken in LHO aLOGs 39975 and 39993.

All suspensions are free of rubbing at a corner volume vacuum level of ~1e-6 Torr.

A few oddballs in the results are due to measurement error:
 - The gains on the P and Y TEST bank (through which excitation is driven) of PRM were not set to unity, so the P to P and Y to Y transfer functions look like they have higher response than previous measurements, but the scale difference is exactly the extra TEST gain. 
 - SRM transfer functions were taken with the HAM5 ISI in DAMPED only, not ISOLATED, so the second zero in the T to T transfer function shows a cross coupled mode of the ISI.
Both are non-issues.

Note, I've made a pretty major overhaul to the comparison script
    /ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/MatlabTools/plotallhsts_tfs_M1.m
namely, I've rearranged the measurement list to be alphabetical by IFO, then by optic. This has a few benefits: 
    (1) The optics that we aren't measuring regularly, the LIGO India Optics are at the top. Since they don't get any new measurements ever added, we don't have to increment the measurement counter. We had to before, because they were interspersed between the other IFOs.
    (2) LLO gets to be at the bottom, so they don't have to increment LHO's measurement numbers when they add a new SUS measurement
    (3) The list is grouped by IFO, so once you add your IFOs new suspensions, it'll be more obvious if the other IFO's numbers have gotten screwed up.
This is a step toward some future better way of handling this gigantic list of data. We'll get there one day!
The changes have been committed to the SusSVN repo.

TITLE: 01/04 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: IMC Trans work, CDS cabling, and a temperamental h1ioplsc0 are the highlights of the day. In other work, EY clean room is set up and running, corner station HWSX table is aligned (Y is still in progress), and TCS Y chiller sprung a leak.
LOG:

• 15:29 Mark, Tyler to LVEA
• 16:10 Chris to ends with pest control
• 16:31 Fil to LVEA to IOT2 table
• 16:35 Mark, Tyler out and moving TMDS equipment to EY
• 16:50 Terry to SQZr Bay
• 16:53 Ed to CER
• 17:10 Chris back
• 17:11 Corey, Niko to Optics Lab
• 17:22 Richard to LVEA to join Fil
• 17:42 Jeff B to ends for dust monitor maintenance
• 17:55 Corey out of optics lab
• 18:00 Jenne, TVo to LVEA to realign MC trans path on IOT2
• 18:11 Marc to CER
• 18:12 Sheila to LVEA around HAM6 and SQZr Bay
• 18:17 Mark, Tyler back from EY
• 18:22 Karen, Vanessa to EY
• 18:28 Jeff K starting transfer functions on SRs
• 18:41 Sheila, Nutsinee to Opt Lab, Daniel is in the LVEA as well
• 19:30 Jeff B back from ends, going to LVEA via mechanical room.
• 19:25 Richard to LVEA
• 19:41 Jenne, TVo out
• 19:41 Jeff B out
• 19:52 Richard out
• 20:01 Ed out for lunch
• 20:01 Greg checking TCS chiller and lines for leaks
• 20:03 Daniel restarting CS Beckhoff
• 20:14 Jenne to LVEA for align MC Trans some more. Cheryl to PSL and then joining Jenne
• 20:26 Karen, Vanessa leaving EY
• 20:28 Niko out of Opt Lab
• 21:48 Marc to LVEA to continue wiring
• 13:52 Daniel to LVEA?
• 21:53 Ed to CER
• 21:56 Keita to LVEA to talk to Daniel
• 22:01 Daniel, Keita out
• 22:04 Niko to Opt Lab
• 22:10 Terry out for lunch
• 22:15 Chandra, Bubba to LVEA and using the snorkel lift
• 22:24 Jenne out
• 22:30 h1ioplsc0 timing error again
• 22:39 Terry to SQZr Bay
• 22:39 Bubba out
• 23:21 TVo to LVEA to HWS table
• 23:27 Niko out
• 23:35 TVo out
• 23:38 Betsy to EY
• 23:48 Keita out
• 23:50 Chandra out
• 00:05 Ed, Fil out

Measured -30.4 deg C

J. Kissel

I've taken standard rubbing-check, top-mass to top-mass transfer functions for all suspensions in HAM4, HAM5, and BSC2 now that we're down to about 1e-6 Torr (which is sufficient a vacuum that the suspension positions won't change further from buoyancy). Good news: All suspensions are free of rubbing after pumpdown, including SRM, SR2, SR3 and BS

Data files are listed below. Detailed results will be processed and posted in due time.
    /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SR?/SAGM1/Data/2018-01-04*.xml

    /ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/SR3/SAGM1/Data/2018-01-04*.xml

    /ligo/svncommon/SusSVN/sus/trunk/BSFM/H1/BS/SAGM1/Data/2018-01-04*.xml

As a teaser / proof, I attach screenshots of each M1 Pitch to M1 Pitch transfer functions for the Triples.

Over the last week we have noticed an anomalous peak in the amplitude spectrum of various sensors on ETMX-ISI, reminiscent of the 0.6Hz peak on HAM 2(?) back when

Looking more closely it seems to be mostly showing up on  a few of the CPS channels, St1-H1, ST2-H2 and H3, see the attached screen shot. This data is with the loops on

Ground loop checks for SUS have been completed for the following HAM's:

HAM2, HAM3, HAM4, HAM5, and HAM6.

Multiple shorts to ground chamber were found and addressed. Many cables required the in-vacuum cables to be disconnected at the flange and re-seated. See alog 12528 for similar issues of four screws touching the feed-thru if not recessed completely.

HAM 3 gave us the most difficulties. In-chamber shorts were found at one of the table brackets. We also suspect air-side cables SUS-3 and SUS-26 to be faulty. To convince ourselves we had no grounding shorts in-chamber we disconnected the following air-side cables and tested directly at the air-side feed-thru: cables SUS-3, SUS-2, SUS-25, and SUS-26.

Same was seen on HAM5 for cable SUS-20.

Testing of OFI and SQZ ZM(tip-tilts) all passed.

TCS temperature sensor - Read about 110 ohms on pins 1/2 and 14/15 which does not agree to drawing. According to D1102257, two sets of RTD's should be seen on pins 2/3 and 14/15 and on pins 12/13 and 24/25.

Shorts were also found in the BSC chambers that still need to be looked at:

ITMX - SUS-42, SUS-57
ITMY - SUS-9, SUS-17
BS - SUS-81, SUS-82

Please note that moving cables in-chamber can produce shorts. Please use caution when doing final closeout activities.