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ID Date Author Type Categorydown Subject Text Attachments
  15431   Thu Jun 25 15:11:00 2020 gautamUpdateSUSMC1 coil driver resistance quarteredI implemented this change today. We only
had 100 ohm, 3W resistors in stock (no 200
ohm with adequate power rating). Assuming
 MCF.pdf 
  15434   Sun Jun 28 15:30:52 2020 gautamUpdateSUSMC1 sat-box de-liddedJudging by the summary
pages, some 18 hours after this
change was made and the board re-installed,
 20200628T144138.jpg 
  15435   Sun Jun 28 16:29:58 2020 ranaUpdateSUSMC1 sat-box de-liddeddoes the FLIR have an option to export
image with a colorbar?

How about just leave the lid open?
  
  15436   Sun Jun 28 17:36:35 2020 gautamUpdateSUSMC1 sat-box de-liddedHmm I can't seem to export with the
colorbar, might be just my phone though.
I tried to add some "cursors" with
  
  15438   Mon Jun 29 11:55:46 2020 gautamUpdateSUSMC1 sat-box de-liddedThere was no improvement to the situation
overnight. So, I did the following today:


Ramped bias voltages for
 SatBoxSwap.jpg 
  15440   Mon Jun 29 20:30:53 2020 KojiUpdateSUSMC1 sat-box de-liddedSigh. Do we have a spare sat box?   
  15506   Thu Jul 30 16:16:43 2020 gautamUpdateSUSSuspension recoveryThis
earthquake and friends had tripped all
watchdogs. I used the scripted watchdog re-enabler,
  
  15610   Sun Oct 4 15:32:21 2020 gautamUpdateSUSSuspension health checkSummary:

After the earthquake on September
19 2020, it looks to me like the only
 combined.pdfallPlots.zip 
  15712   Mon Dec 7 11:25:31 2020 gautamUpdateSUSMC1 suspension glitchy againThe MC1 suspension has begun to show
evidence of glitches again, from Friday/Saturday.
You can look at the suspension Vmon tab a
  
  15720   Wed Dec 9 16:22:57 2020 gautamUpdateSUSYet another round of Sat. Box. switcharooAs discussed at the meeting, I decided
to effect a satellite box swap for the misbehaving
MC1 unit. I looked back at the summary pages
 WFS2.pngWFS_lineNoise.pngWFSchar.pdf 
  15730   Thu Dec 10 22:45:42 2020 gautamUpdateSUSMore spare OSEMsI acquired several spare OSEMs (in unknown
condition) from Paco. They are stored alongside
the shipment from UF.
  
  15747   Sun Jan 3 16:26:06 2021 KojiUpdateSUSIMC WFS check (Yet another round of Sat. Box. switcharoo)I wanted to check the functionality of
the IMC WFS. I just turned on the WFS servo
loops as they were. For the past two hours,
 Screen_Shot_2021-01-03_at_17.14.57.png 
  15777   Tue Jan 26 10:58:30 2021 gautamUpdateSUSMC2 tickler stuck onFor whatever reason, the autolocker didn't
turn the tickle off for several
hours. Seems to work okay now. The linked
  
  15783   Thu Jan 28 22:34:21 2021 gautamUpdateSUSDe-whiteningSummary:


We will need de-whitening
filters for the BHD relay optics in order
 DACnoiseModels.pdfactuationRange.pdfdeWhiteTFs.pdfdispNoiseModels.pdf 
  15805   Thu Feb 11 18:21:39 2021 gautamUpdateSUSMC suspension glitchesMC1
suspension is glitching again, so
this is a good chance to install the new
  
  15806   Fri Feb 12 15:03:48 2021 JordanUpdateSUSCoM on 3"->2" Adapter Ring for SOSAs it currently stands the Center of Mass
of the Adapter Ring/Optic assembly is 0.0175"
out of the plane formed by the suspension
 Screenshot_(1).pngScreenshot_(3).pngCoM.PNG 
  15809   Tue Feb 16 14:56:44 2021 gautamUpdateSUSaLIGO Sat Amp installed, powered[jordan,
gautam]


Ran 60ft long cables from
 MC1_deadUL.pngIMG_9100.jpg 
  15813   Wed Feb 17 13:59:43 2021 KojiUpdateSUSCoM on 3"->2" Adapter Ring for SOSNote from today's meeting:

1. Can we adjust the thickness of
  
  15814   Wed Feb 17 16:11:53 2021 gautamUpdateSUSaLIGO Sat Amp installed, poweredThere is some non-trivial sign flipping
in the sensors/coils in this new setup because
it is a hybrid one with the old interfacing
  
  15816   Thu Feb 18 15:15:12 2021 yehonathanUpdateSUSOSEM testing for SOSsI am setting up a testing rig for the OSEMs
we recently obtained. I found the schematic
for the OSEM assembly from which the pin
 OSEM_Pin_Plate.png 
  15817   Thu Feb 18 15:33:21 2021 gautamUpdateSUSaLIGO Sat Amp installed, powered and commissionedThe WFS servo was recommissioned. The matrix
can be tuned a bit more, but for now, I've
recovered the old performance and the alignment
  
  15818   Thu Feb 18 18:05:04 2021 gautamUpdateSUSaLIGO Sat Amp characterizationBefore installation, I performed a bunch
of tests on the aLIGO sat amp. All the measurements
were made with the dummy suspension box substituting
 OSEMnoise.pdfLEDdriveNoise.pdf 
  15819   Thu Feb 18 20:20:25 2021 KojiUpdateSUSaLIGO Sat Amp characterizationYeah, it's really inconsistent. You
had 35mA LED drive and the current noise
of the noisy channel was 5e-7 A/rtHz at 1Hz.
  
  15823   Fri Feb 19 15:17:51 2021 JordanUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSAdjusting the thickness of the cylindrical
hole for the mirror on the 2" optic
sleeve, from .6875" to .61" thick,
 Neutral_Point.pngDumbell_Max_Negative_Travel.pngDumbell_Max_Positive_Travel.png 
  15824   Fri Feb 19 16:06:01 2021 KojiUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSWe want to move the CoM with the adjustment
range so that the residual deviation is adjusted
by the bottom dumbbell. 0.0003" is well
  
  15825   Fri Feb 19 16:14:16 2021 gautamUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSI briefly talked with Jordan about this.
This suspension will have OSEMs right? With
400ohm series resistance for the coil drivers,
  
  15826   Fri Feb 19 16:55:26 2021 KojiUpdateSUSCoM Range on 3"->2" Adapter Ring for SOSJordan's screenshot actually shows
that the vertical distance (Y) is 0.0000".
We want to have the vertical distance of
  
  15832   Mon Feb 22 14:06:49 2021 YehonathanUpdateSUSOSEM testing for SOSsContinuing with the OSEM testing. I measure
the resistance of the wires from the RLC
meter to the coil to be ~ 0.9ohm. I will
  
  15835   Tue Feb 23 20:55:19 2021 KojiUpdateSUSOSEM testing for SOSsI can't obtain a consistent view between
the existing drawings/photographs and your
pin assignment. Please review the pin assignment
 SOS_OSEM.pdf 
  15836   Tue Feb 23 23:12:37 2021 KojiSummarySUSSUS invacuum wiringThis is my current understanding
of the in-vacuum wiring:
1. Facts
 SOS_OSEM_cabling.pdf 
  15837   Wed Feb 24 10:09:16 2021 yehonathanUpdateSUSOSEM testing for SOSsYes, my phone camera mirrored the image.
Sorry for the confusion.

I see you already uploaded the
  
  15838   Wed Feb 24 10:23:03 2021 YehonathanUpdateSUSOSEM testing for SOSsContinuing with the new rig, I measure
the resistance of the cable leading to the
coil to be 0.08+(0.52-0.08)+(0.48-0.08)=0.9ohm.
 OSEM_078_LED_Spot.JPGOSEM_280_LED_Spot.JPGOSEM_117_LED_Spot.JPG 
  15856   Wed Mar 3 11:51:07 2021 YehonathanUpdateSUSOSEM testing for SOSsI finished testing the OSEMs. I put all
the OSEMs back in the box. The OSEMS were
divided into several bags. I put the OSEM
  
  15880   Mon Mar 8 17:09:29 2021 gautamUpdateSUSPRM coil actuators heavily imbalancedI realized I hadn't checked the PRM
actuator as thoroughly as I had the others.
I used the Oplev as a sensor to check the
 PRMact.pdf 
  15881   Mon Mar 8 19:22:56 2021 ranaSummarySUSIMC suspension characterizationHerewith,
I describe an adventure
  
  15886   Tue Mar 9 14:30:22 2021 YehonathanUpdateSUSOSEM testing for SOSsI finished ranking the OSEMS on the OSEM
wiki page.
  
  15887   Tue Mar 9 14:37:26 2021 gautamSummarySUSPRM suspensionThe PRM got tripped ~5AM this morning.
The cause is unclear - the seismometer reports
elevated activity ~10 minutes before the
 PRMtrip.png 
  15888   Tue Mar 9 15:19:03 2021 KojiUpdateSUSOSEM testing for SOSsHow were the statistics of them? i.e. #
of Good OSEMs, # of OK OSEMs, etc...
  
  15889   Tue Mar 9 15:22:56 2021 KojiSummarySUSPRM suspensionI just saw the PRM watchdog tripped
at ~15:20 local (23:20UTC). I restored
the PRM but I saw only the side watchdog
  
  15891   Tue Mar 9 18:49:28 2021 YehonathanUpdateSUSOSEM testing for SOSs29 Good OSEMs, of which 1 is questionable
(089) with PD voltage of 1.5V, 5 need some
work (pigtailing, replace/remove/add screws).
  
  15894   Wed Mar 10 11:55:22 2021 gautamUpdateSUSPRM suspension suspectThe procedure is that the optic is kicked
to excite it, and allowed to ring down for
~1ksec, with damping turned off. The procedure
 PRM_sensorSpectra.pdfPRM_pkFitNaive.pdfPRM_diagComp.pdf 
  15898   Wed Mar 10 17:35:47 2021 gautamUpdateSUSSpooky action at a distanceAs I am sitting in the control room, the
PRM suspension watchdog tripped again. This
time, there is clearly no
 PRMtrip.pngPRMtrip_zoom.png 
  15902   Thu Mar 11 08:13:24 2021 Paco, AnchalUpdateSUSIMC First Free Swing Test failed due to typo, restarting now[Paco, Anchal]

The triggered code went on at 5:00
am today but a last minute change I made
  
  15907   Fri Mar 12 03:08:23 2021 KojiSummarySUSCoil Rs & Ls for PRM/BS/SRMSummary

Per Gautam's request, I've
checked the coil resistances and inductances.
 P_20210311_224651.jpgP_20210311_225359.jpg 
  15913   Fri Mar 12 12:32:54 2021 gautamSummarySUSCoil Rs & Ls for PRM/BS/SRMFor consistency, today, I measured both
the BS and PRM actuator balancing using the
same technique and don't find as serious
 BS_actuator.pdfPRMact.pdf 
  15914   Fri Mar 12 13:01:43 2021 ranaSummarySUSCoil Rs & Ls for PRM/BS/SRMugh. sounds bad - maybe a short. I suggest
measuring the inductance; thats usually a
clearer measurement of coil health
  
  15915   Fri Mar 12 13:48:53 2021 gautamSummarySUSCoil Rs & Ls for PRM/BS/SRMI didn't repeat Koji's measurement,
but he reports the expected ~3.2mH per coil
on all the BS and PRM coils.
  
  15926   Tue Mar 16 19:13:09 2021 Paco, AnchalUpdateSUSFirst success in Input Matric DiagonalizationAfter jumping through few hoops, we have
one successful result in diagonalizing the
input matrix for MC1, MC2 and MC3.
 IMC_InputMatrixDiagonalization.pdfInMatCalcScripts.zip 
  15929   Wed Mar 17 10:52:48 2021 JordanUpdateSUS3" Ring Adpater for SOS I have added a .1", 45deg chamfer
to the bottom of the adapter ring. This was
added for a new placement of the eq stops,
 Side_View.pngFront_View.pngRing_with_Modifed_Bracket.pngBack_of_ring.pngFront_of_Ring.png 
  15930   Wed Mar 17 11:57:54 2021 Paco, AnchalUpdateSUSTested New Input Matrix for MC1[Paco, Anchal]

Paco accidentally clicked on C1:SUS-MC1_UL_TO_COIL_SW_1_1
(MC1 POS to UL Coil Switch) and clicked it
 20210317_MC1_InMATtest.pdfMC1_Input_Matrix_Test.tar.gz 
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