09:00 Meeting Minutes

Vent: 
CS post vent cleanup and close out efforts finishing up. 
Venting of End-Y will start today. Doors may come off on Wednesday. 
Prep work continues at End-Y.

Maintenance:
Hugh will be working on lifting the 16” conflate to the top of HAM6.
Hugh is servicing HEPI hydraulics at End-Y, and accumulator pressure checks in the corner station.  
Peter will be visiting the PSL alignment; it seems to have drifted a bit after the holidays. 
CDS rebooting servers and computers to pick up security patches.
Daniel is doing some Beckhoff work for the Squeezer implementation. 
There is a pending ASC model reboot.

Safety Message: 
Be aware there are large animals around the site and roads, especially in the mornings. 
The roads are still very slippery in the mornings. This morning there was a truck in the pond next to Twin Bridges road.    

End Y RGA scan pre-vent

For reference

PSL Weekly Report - 10 Day Trends FAMIS #6182

Evidently:

•  Recent dormancy of the PSL over the holidays resulted in some difficulties re-establishing the injection locking.
• This past Saturday, Peter's aLog tells of another trip.

all other plots show congruency with these events.

PSL crystal chiller topped off

Added 300 ml of water to the crystal chiller.

1810 hrs.local -> Kyle on site

Working in EE lab swapping cable connector needed for tomorrow.  Will first shut down HAM5/6 AIP pump cart and check in on Kobelco unit.  

Expect to be here for 1 - 3 hours and will make a comment to this entry when leaving.

Initial attempt at custom cable + connector combination didn't work due to cable's inner insulator diameter being too large for connector internals -> Have a new idea that should work and will try again tomorrow.  

2035 hrs. local -> Leaving site now.

Oscillator restart

As per alog entry 40022 the oscillator shutdown this morning.
The laser status screen indicated that there was a power watchdog trip and a head 1-4 flow error.  Looking at trend data for the flow rates
through the heads, the lowest one was head 3.  However its flow rate was relatively constant for the previous 12 hours - the increase at the
end is because I restarted the crystal chiller to see if there was a blockage in the system, because previously I remembered all the flow
rates to be around the 0.7 lpm mark.  My conclusion is that the power watchdog was tripped because the injection locking broke (for unknown
reasons at this point in time).

    I was a little surprised to find that the power reported by head 1 was so low and increased the current from 53.9 A to 56.6 A.  This
improved the output of the locking photodiode from ~0.4 to 0.6 V  to values consistently greater than 1 V as the system was trying to acquire
lock.  The servo gain control voltage was lowered from 0.50 to 0.00 V.  At this point it looks like the alignment into the locking photodiode
needs to be adjusted, as the alignment may have changed during the holiday shutdown period as the system cooled down.  I am opting to wait
until Monday to make that adjustment.

    The other servos came back on line without too much trouble.  The power stabilisation requires some looking at however.

The laser shutdown was triggered by the power watchdog, which in turn was activated by the injection locking losing lock.
A cursory glance at a number of signals does not explain why the injection locking broke.  It might be that the SR560
that was added to the injection locking servo to provide some low frequency boost gain, temporarily saturated.  That's
conjecture on my part as I do not know of any monitor signals that it provides.

SQZ Slow Control Testing

Sheila, Daniel, Nutsinee

 

We tested Beckhoff communications to the SQZ chassis on the squeezer rack and ISC rack. Below is the summary:

 

VCO

• 3 cables connecting the RF frequency monitor to the timing comparator were missing: ISC_SQ_370_1, 371_1, and 372_1 all BNC->N. Fil already know about these.
• Temperature calibration was wrong: ~5 V measured out of the chassis gets converted to something like 1C on the medm screen. Probably just the Beckhoff code problem

 

VCXO

• VCXO link screen was missing from the lsc electronics medm. Otherwise everything else seemed fine. 

 

Phase Shifter/Delay Line (U32, U23, U19)

• phase shifter screen didn't show errors when it's supposed to. Every LED on the tester lit up fine.

 

6MHz Demod (U31)

• medm screen complained "power supply out of range" and that power is not okay. The chassis powered just fine. Same complain for the other Demod screens.
   

CLF Common Mode Board Servo

• Filter button in the "Slow Path" didn't engage properly. One time I plugged the tester in the light was on all the time. The other time I plugged it back the light was off all the time. There's no problem on the software end. I have yet to check the back of the Ethercat chassis itself.

 

SHG Common Mode Board Servo

• When engaged Boost in the Slow Path the signal was actually sent to Compensation on the tester, when engaged Compensation the signal was sent to Boost.

 

LO and OPO Common Mode Board Servo

• Both work fine

 

PZT Driver (There's only one PZT driver chassis that controls all the SQZ PZTs)

• OPO PZT screen didn't work during this test (channels white out) and SEED PZT screen didn't seem to be talking to anything.
• "Offset 1" on the tester corresponded to LO PZT remote offset. When asked for 5V on the screen the tester read 0.248V. When asked for 10V it read 0.5V. When asked for -10V it read -5V. Seems like the signal that's actually get sent to the chassis read 5V to low (or high, when asked for negative V) consistently.
• "Offset 4" on the tester corresponded to SHG PZT offset. Also read 5V too low (or high when asked for negative). 
• I didn't get a chance to test what actually came out of the monitor. Not sure what's the best way to do that either.

 

Binary IO (whitening chassis)

• I could only test the binary IO signal sent to the chassis on the ISC rack (the bottom of the far right rack). They're fine. The one of SQZ rack needed a model restart before they can be tested.

 

What's left to do?

• Test the rest of the demod signal (35MHz, 80MHz, and I think the other one is 3MHz?).
• Complete testing PZT driver signal (OPO, SEED) and the monitors if there's anything we could test.
• Complete testing the binary IO signal to the whitening chassis on the SQZ rack.
• Check the CLF common mode board signal at the back of the Ethercat chassis.

 

Since every chassis has been tested to receive the signal properly prior to the installations (according to Daniel) I didn't bother to test that again (except for the VCO chassis, Sheila tested that one).

flashing IMC, then no light

I was mproving the flashing in the IMC, and then something happened, and there was no light into the IMC.

I collected 14 seconds of data on channels I think might help an expert explain, and have attached the plots.

NPRO is running, and OSC_PD_AMP_DC_OUT shows 35W, so that part of the laser in on.

IMC flashing, seems like correct Refl beam is coming out (based on power)

[Cheryl, Jenne]

This is going to be a short summary, and we'll comment with more details after we've had a chance to eat dinner.  But, it seems like the correct IMC Refl beam is coming out of the vacuum onto the table, based on power meter measurements.  With MC3 misaligned, we measured about 65mW on IOT2, compared with 65-71mW on the PSL table (hard to get a good measurement at either location, but the numbers match pretty well, so it's not like this is a ghost beam or something).

In the end, we put the IMC mirrors and the PZT back to the locations that were known to be good on Wednesday (HWP was still in, but refl beam on IOT2 looked reasonable at that time).  Cheryl did some adjustments to the bottom periscope mirror in the PSL enclosure, and we seem to be getting the right beam out.  However, the beam on the table looks not so great, so we're not 100% sure that we're really happy with the refl beam, but it's at least the right beam coming out.

Searching for At-Vacuum Violin Mode Resonances in H1 SUS ITMX

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.

Ops Day Shift Summary

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)

 

Rubbing Check Measurements on ITMs -- ITMX Great, Suspicious behavior of ITMY V and R DOFs

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

Opened FRS Ticket 9683 to track this issue.

Plugs installed in HAM 6 Annulus

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.

Setup Dust Monitor at End-Y

   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. 

EY purge air ON

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

HAM SUS Ground Loop Checking Status

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.

Translating which BSC SUS cables correspond to which, from D1100022,

ITMX - 
   SUS-42  = M0 LF RT, R0 LF RT OSEMs' signal chain, from vacuum flange to field sat amp
   SUS-57  = L2/PUM UL LL UR LR OSEMs' signal chain, from vacuum flange to field sat amp
ITMY - 
   SUS-9   = Reaction Chain's (R0) F1 F2 F3 SD OSEMs' signal chain, from the vacuum flange to the field sat amp
   SUS-17  = L2/PUM UL LL UR LR OSEMs' signal chain, from vacuum flange to field sat amp
BS - 
   SUS-81  = M1 F1 F2 F3 LF OSEMs' signal chain, from vacuum flange to field sat amp
   SUS-82  = M1 RT SD OSEMs' signal chain, from vacuum flange to sat amp