Ops Day Shift Summary

h1sush2a One Stop Fiber Replacement and OneStop Fiber Inventory

WP7774 h1sush2a OSS fiber replacement

	serial number	cable label
old	UA10490001.A	h1sush2a
new	UA10510002.A	h1sush34

which leads to the question if h1sush34's cable was on top of the rack, what is h1sush34 using

	serial number	cable label
h1sush34	UA11040002.A	no label

There is a spare OSS fiber at h1oaf0 following a past upgrade

	serial number	cable label
old	UA12110005.A	h1oaf0
new	UA12120006.A	ONESTOP 2

For all the front end computers, their OSS cable has the computer name as its label except for the following:

host	OSS cable label
h1lsc0	no label
h1oaf0	ONESTOP 2
h1sush2a	h1sush34
h1sush34	no label
h1susauxh34	no label

And finally on the top of the MSR rack, there are the following OSS cables

h1susauxh34 (good spare?)

ONESTOP 1 (good spare)

ONESTOP 3 (good spare)

no label (good spare)

h1oaf0 (behind h1oaf0, possibly bad)

h1sush2a (behind h1sush2a, possibly bad)

 

CDS maintenance summary

WP7765 CDS WAP configuration standardization

Dave, Carlos:

All 6 CDS WAPs (wireless access points) now share a common networking configuration.

WP7774 Replacing h1sush2a One Stop fiber

Richard, Dave:

As part of the investigation into h1sush2a's recent instability, we replaced the One Stop fiber for a spare line today. Details in separate alog.

WP7770 ISI-HAM[2,3] GS13 cable and model switching

Hugh, Dave:

New models for h1isiham[2.3] were installed to match the GS13 field cabling changes made today. Also the updated BIO parts were added to the models.

WP7749 Removal of temporary GS13 fast channels from frame

Hugh, Dave:

New h1isiham[2,3,4] models were installed which remove the temporary GS13 DQ channels from the frame (six per model).

Vacuum Controls end station ion pump addition

Patrick, Dave:

h0vacey was modified to add IP17, h0vacex was modified to add IP18. A new INI file was created for each system.

Slow Controls Wind Fence channels added to h1ecaty1plc1

Patrick, Dave:

h1ecaty1plc1 was modified to add its wind fence channels. A new INI file was created.

DAQ Restart

Dave:

The DAQ was restarted at 13:07 PDT to support:

h0vacex and h0vacey new IP channels.

h1ecaty1plc1 new wind fence channels.

h1isiham[2,3,4] removal of temporary GS13 channels.

Movement of HWS ITM periscope mirrors

TVo, Danny

To get a better idea of how the picomotor movements effect the movement of the Hartmann beam across the ITM, we decided to move them by a larger amount. To make sure there isn't any clipping I went out to the HWS table and removed the Hartmann plate to view the beam on the ccd while moving. 

The following moves were made: 

ITMX upper periscope mirror: 700 counts to the right

ITMX lower periscope mirror: 500 counts to the right

ITMY upper periscope mirror: 500 counts to the left. 

Attached are the current picomotor settings.

A ring heater test will be coming soon. 

Added IP17 and IP18

WP 7773

The PLC code on h0vacex has been updated to add IP18. The PLC code on h0vacey has been updated to add IP17.

I also took the opportunity to split the PLC code for the BPG 402 gauges into separate revisions to address the problem I noted in alog 43341.

The high voltage has been turned back on at both end stations.

I burtrestored both to 6 am today.

BS M1 L2P decoupling

We updated the L2P FF filter in BS M1 stage.

The resultant M1 L drive to BS oplev pitch TF is shown in the first attached image. The blue curves were for the old L2P FF (only a scalar with gain 0.002), and the red ones were for the new, freq-dependent FF at the M1 stage.

The measured FF filter = L2P/P2P appeared to be quite hard to fit, partly due to that I did not took a long enough measurement to integrate for good SNR. Thus for now we only focused on the main SUS resonance at ~ 0.5 Hz, and the microseismic band ~0.2-0.3 Hz, while sacrificing the earthquake band < 0.1 Hz. It should be fine in the full lock state when we could relying on the feedback to handle the <0.1 Hz band, but whether the current FF would be beneficial for the lock acquisition would still need to be tested.

Somehow in the coherence plot (top-right) the reduction in the main sus resonance was not apparent (it might be due to the fact that the DTT TF is a biased measurement, as the measurement noise term would not vanish in the auto-correlations used for computing coherence; see, e.g., Evan Hall's thesis, Appendix A). Nonetheless in the TF plot (top-left) we could see roughly an order of magnitude reduction at 0.5 Hz. The measurement used to fit the TF was done with the oplev damping off, and the attached plot showed the result with the oplev on. Thus it seemed that the FF should work in either case.

In the FF_fit_vs_data.pdf we show the fitted TF (blue) and the data (orange). The foton filter we use currently is:

zpk(
[
0.000000e+00+i*0.000000e+00; 
-1.400000e-01+i*0.000000e+00; 
-2.043560e+00+i*0.000000e+00; 
1.348996e+00+i*0.000000e+00; 
-1.028492e+00+i*8.718815e-01; 
-1.028492e+00-i*8.718815e-01; 
],
[
-5.000000e-03+i*0.000000e+00; 
-2.000000e-01+i*0.000000e+00; 
-1.720109e+00+i*0.000000e+00; 
-1.734806e+00+i*0.000000e+00; 
-2.301921e+01+i*0.000000e+00; 
-1.335285e-01+i*2.691426e+00; 
-1.335285e-01-i*2.691426e+00; 
-2.199115e+01+i*3.808979e+01; 
-2.199115e+01-i*3.808979e+01; 
],
4.584153e+02
)

I've updated the Actuator Tuning Spreadsheet accordingly (remember to switch from personal google account to ligo.org authentication in order to view). Thanks Hang!

EY PT423 alarm bypassed following restart of h0vacey

After the restart of h0vacey, PT423 did not engage. While we wait for a cosmic ray to trigger this gauge, I've bypassed it from the cell phone alarms system. This will be standard procedure following code restarts, providing the bypass period overlaps with the operator's shift (i.e. no unattended bypass period).

Bypass will expire:
Tue Aug 14 15:48:54 PDT 2018
For channel(s):
    H0:VAC-EY_Y1_PT423B_PRESS_TORR

 

WHAM2 & 3 GS13 Switching now seamless and successful

WPs 7770, 7749, FRS 11049.  DaveB, RichardM, JimW, HughR

Conclusion--Yes the model and the hardware were at cross purposes as Interface Chassis 1 had GS13s corners 1 & 3 while the BIO switching via the model thought it was corners 1 & 2.

Details:

Rewired the interface chassis for HAMs 2 & 3 to have corners 1 & 2 GS13s  to chassis #1 and corner 3 to go to chassis #2 (switched cables 2 & 3.)  Rewired the top level models for HAM2 & 3 to reflect this field wiring change.  Dave also swapped out the deprecated digital IO cds RCG part with the current latest version.  Removed the GS13INF_OUT channels from the DAQ list in the common model and the one occurrence of "DACKILL", an annotation element.  There should be no more user model DACKILL parts.

After Dave rebuilt, checked etc, and the model was restarted, ran the ISIs in DAMPED mode and toggled each digital filter on the GS13s.  No problematic wildness occurred.  Then ISOLATED the platform and used the commands scripts to toggle the filters--all good.  Finally, changed the Guardians to include the GS13 switching--the GS13s switch to high gain whitening off after isolating and switches back when deisolating or tripped.  Exercised the platforms via the guardian and no issues; the GS13 change state with out bothering the platform much less tipping them violently.

Finally.

 

 

SQZ CLF Shutter

Haocun Nutsinee Daniel

We set up the mechanical shutter in front of the CLF photodetector. With the threshold at 0.5V, it triggers around 10mW.

Some cables/optics/etc. needed to be added and adjusted. It also required a configuration change in TwinCAT for Shutter_H.

locking tonight

We've been able to lock (on RF) several times tonight, but each lock only lasted a few minutes.  

• I added the DHARD P compensation filter and gain increase that I've been doing manually to the guardian. 
• We think that often when we grab the DRMI lock we unlock when the guardian switches off the limiter on the beam splitter.  the largest signal to the BS is due to the PRCL oscillation (we acquire with a high gain setting).  As a test I put the gain decrease for PRCL before turning off the limiter, this hasn't really solved the prolem.  Earlier tonight I had removed teh SRCL mode hopping offset, and for about three lock acquitisions after that we didn't have any of the short locks, but then they returned. 
• We have commented out the gain redistribution in the ANALOG_CARM state, we lost lock once doing this and it needs to be re-written for our current gain settings anyway.  
• The CARM loop may be the reason we keep loosing lock so quickly.  These lock losses have had a very quick glitch visible in DARM and about 0.1 of a second later we loose lock. 
• We also have lost lock frequently while engaging DHARD WFS.  It think that this might be because the michelson gets misaligned when DHARD comes on, so it might be helpful if we could run at least a BS alignment loop during lock.  Hang looked at the 72 MHz signal for this, but earlier tonight it wasn't a good choice.   I have changed the DHARD WFS state so that the signal is only sent to the ETMs for now, we can add it back in when we have some ASC working.  I also doubled the gain to compensate.  

I started the ETMX ring heater test, but another EQ is starting just now.  

EFM spectra from chassis with modified gain

This afternoon I switched on the EFM chassis for the first time since Fil fixed the gain.

The Y axis, which used to have high noise at high frequency, is now very quiet, see first screenshot. I'm not sure why this is the case.

I also had a look at the time series over 4 hours after turning on the EFM, see second screenshot, the noisy parts are when the ETMX ESD actuators are used while the commissioning team acquire lock. This noise is seen in both X and Y axes.

Hi Georgia,  I am not quite sure I follow all of this, but I am interested.  I see a few plausible explanations relating to changing the machine states that may explain a shift in the noise spectrum, but I could be missing your point.  At this point, are you thinking there could be a malfunction in the electronics chain somewhere?  I can dig into this further tomorrow and generate zero field noise spectrum if you find it useful.  Please let me know if there’s anything I should be working on relating to this issue.

Prototype large magnetic injection coil

With the magnetic injection system that we currently have, we must inject lines or combs in order to see the magnetic coupling in DARM in a reasonable time. We would like to probe more of the coupling spectrum using bands rather than lines, especially since the coupling functions are more complex now that coupling is dominated by cable and connector coupling instead of coupling to permanent magnets.  In order to inject larger fields we have prototyped a large coil.

The coil is a rounded square 16’ feet on edge that is bent around the corner of the wall in the LVEA. The coil is about 30m +X and 30m +Y of the vertex (Figure 1). The coil consists of about 5000’ of 10 gauge plastic-insulated copper wire, giving 80 turns and 5 ohms of resistance. The coil is held by four 90-degree-turn cable tray segments attached at studs, and two bars that extend out from the corner of the wall at the top and bottom. We wound the coil from the ground using a system illustrated in this video: https://youtu.be/OdJbYw1uyow

Figure 2 shows that we were able to produce several times greater fields at the vertex than for our standard PEM injections, even though the big coil was further away than the 1m coil for the standard Y-manifold PEM injections.

Figure 3 shows broad band injections with the 5m coil that are, in some frequency bands, comparable in amplitude to the comb injected by the 1m coil.

Philippe N., Kara M., Richard M., Mark D., Tyler G., Robert S.

ITMX and ITMY Ring Heater test 8-9-2018

Georgia, TVo, TJ, Danny

According to the prism values it appears we are better overall (relative to the 8-7-2018 and 8-8-2018 measurements alog 43325) : 

	Horizontal displacement from ITM center (mm)	Vertical displacement from ITM center (mm)
ITMX	39	5
ITMY	24	18

Attached are gifs display the heating up and cooling down. (There appear to be no visible particulates on the ITMX image anymore)

Also attached is the prism and spherical power trend data. 

PEM chassis/cables update

The PEM corner station AA chassis have some dead channels and will need to be removed for repair:
Channel 7 (bottom chassis) - (MIC EBAY)
Channel 2 (bottom chassis) - (MIC HAM7)
Channel 29 (2nd from bottom chassis) - (MIC INPUTOPTICS/HAM2)

Cables will be run for accelerometers in the following locations this Tuesday:
HAM 1 - X, Y, Z (top)
HAM 2 - X
HAM 5 - Y, Z (top)
HAM 6 - Y
BSC 2 - X, Z (bottom)
BSC 3 - Z (bottom)