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ID Date Author Type Category Subjectup Text Attachments
  13728   Thu Apr 5 04:36:56 2018 KevinUpdateIOOCoil driver noise[Gautam, Kevin]

We measured the MC coil driver
noise at the output monitors of the coil
 MC3.pdfMC2.pdfCoilDriver.pdf 
  13730   Thu Apr 5 12:13:18 2018 KojiUpdateIOOCoil driver noiseWhy is MC2 LR so different from the others???   
  13738   Fri Apr 6 22:23:53 2018 KevinUpdateIOOCoil driver noise 




 MC2_coil_driver.pdf 
  16162   Wed May 26 02:00:44 2021 gautamUpdateElectronicsCoil driver noiseI was preparing a short write-up / test
procedure for the custom HV coil driver,
when I thought of something I can't resolve.
 coilDriverTopologies.pdfshotVthermal.pdf 
  13870   Sun May 20 23:43:50 2018 gautamUpdateIOOCoil driver noise re-measurementSummary:

In the IMC actuation chain, it
looks like the MC1/MC3
 MC1_coilDriver.pdfMC2_coilDriver.pdfMC3_coilDriver.pdfMC_coilDriverNoises.tgzActuationChainNoiseMeas.pdf 
  14019   Tue Jun 26 16:28:00 2018 gautamUpdateSUSCoil driver protoboard characterizationI wanted to investigate my coil driver
noise measurement technique under more controlled
circumstances, so I spent yesterday setting
 IMG_7060.JPGETMXstitchced.pdfETMXfullSpan.pdfPSRR.pdf 
  16512   Thu Dec 16 12:21:16 2021 AnchalUpdateBHDCoil driver test failed for S2100619-v1Today I found one of the coil driver boards,
S2100619
failed the test on CH2. There appears to
 D1100687_S2100619-v1_TF_CH2_Not_Matching.pdf 
  16516   Thu Dec 16 17:41:12 2021 KojiUpdateBHDCoil driver test failed for S2100619-v1Good catch. It turned out that the both
+ and - side of the output stages for CH2
were oscillating at ~600kHz. If I use a capacitance
 6x 
  15480   Tue Jul 14 16:52:47 2020 gautamUpdateElectronicsCoil drivers for the test massesSummary:

Koji and I had a discussion last
Friday about the suspension electronics.
 coilDriverSchem.pdf 
  15494   Mon Jul 20 17:23:46 2020 gautamUpdateElectronicsCoil drivers for the test massesSummary:

Looking at the signals to the test
mass coils, it seems borderline
 ALSlock_timeDomain.pdfALSlock.pdfRFlock.pdf 
  13082   Tue Jun 27 16:11:28 2017 gautamUpdateElectronicsCoil whiteningI got back to trying to engage the coil
driver whitening today, the idea being to
try and lock the DRMI in a lower noise configuration
 ETMYT_1182669422.mp4ITMY_whitening_studies.pdf 
  4900   Tue Jun 28 15:23:21 2011 steveUpdateElectronicsCoilcraft RF-design kits are restockedOur design kits are full again. They are
waiting for a new brilliant PD design.
 P1070917.JPGP1070915.JPG 
  13862   Fri May 18 09:13:41 2018 PoojaUpdateSUSColored GigE imageTo obtain a colored version with good contrast
of the grayscale image of scattering of light
by dust particles on the surface of test
 Image__2017-11-14__08-25-13_100k100g1V_colored.pngImage__2017-11-14__08-25-13_100k100g1V.tiff 
  5676   Mon Oct 17 10:43:14 2011 MirkoUpdateCDSCommited changes to c1rfmI want to make changes to c1rfm. Found
uncommited changes to it from Sept 27. Since
we recompiled it since then it should be
  
  12145   Wed Jun 1 16:28:28 2016 ericqUpdateElectronicsCommon board Op amp input offsetsI used a Eurocard extension board to peek
at the inputs and outputs of each of the
gain-ladder AD829s on input B of the CM board
  
  12147   Fri Jun 3 12:53:44 2016 ericqUpdateElectronicsCommon board Op amp input offsetsI replaced some of the AD829s with other
AD829s, but the offset situation didn't
improve.
 CMboard_offsets.png 
  8922   Thu Jul 25 12:53:45 2013 CharlesUpdateISSComparator + Triggering Prototype I realized I totally forgot to post
this last week, but I prototyped the comparator
and boost triggering portion of the ISS,
 Comparator_Prototype.pngComp_Triggering_Behavior.jpg 
  1172   Wed Dec 3 20:10:09 2008 Jenne, RanaUpdatePEMComparing Wiener subtraction with different seismometersAttached is a plot of MC_L, and then the residual
MC_L after static Wiener filtering, using
different combinations of our accelerometers
 Dec032008_c1wino_seisCombos.png 
  1173   Wed Dec 3 20:36:07 2008 Jenne, RanaUpdatePEMComparing Wiener subtraction with different seismometersThe Ranger has now been moved over to sit
underneath the MC2 tank (it was previously
close to the PSL rack). It
 d.pdfsco.pngfly.pdf 
  379   Fri Mar 14 14:59:51 2008 josephbConfigurationCamerasComparison between GC650 (CCD) and GC750 (CMOS) looking at ETMXAttached are images taken of ETMX while locked.

The first two are 300,000 microsecond exposure
 ETMX_z2_exp_300000_650.tiffETMX_z2_exp_300000_750.tiffETMX_z2_exp_30000_650.tiffETMX_z2_exp_30000_750.tiff 
  4632   Thu May 5 04:38:20 2011 KojiSummaryLSCComparison between S3399 and FFD-100Comparison between Hamamatsu S3399 and
Perkin Elmer FFD-100
These are the candidates for the
 PD_response.pdf 
  16923   Thu Jun 16 17:40:15 2022 YehonathanUpdateBHDComparison of MICH OLTF model with measurementI made some progress in modeling MICH loop.

Putting all the LSC and SUS filters
together with the MICH Finesse model I constructed
 MICH_Model_Measurement_Comparison.pdf 
  16927   Fri Jun 17 12:05:32 2022 YehonathanUpdateBHDComparison of MICH OLTF model with measurementI should write down what I didn't include
for completeness:

1. AA filters
  
  16928   Fri Jun 17 13:07:08 2022 KojiUpdateBHDComparison of MICH OLTF model with measurementI'm curious why the actual OLTF included
the 60Hz comb...? It is undesirable to have
such structure in the OLTF around the UGF
  
  1999   Thu Sep 24 20:17:05 2009 ranaSummaryLSCComparison of Material Properties for the new RFPD Mounts
    

       
             
  
  3855   Wed Nov 3 17:01:01 2010 josephbSummaryCDSComparison of RFM read times Problem:
RFM reads are slow.  Rolf has
said it should take 2-3 microseconds per
  
  13938   Mon Jun 11 11:45:13 2018 keerthana UpdateelogComparison of the analytical and finesse values of TMS and FSR.


Quantity
 finesse1.pdf 
  13941   Mon Jun 11 18:10:51 2018 Koji UpdateelogComparison of the analytical and finesse values of TMS and FSR.Hmm? What is the definition of the percentage
error? I don't obtain these numbers from
the given values.
  
  13943   Mon Jun 11 19:16:49 2018 keerthanaUpdateelogComparison of the analytical and finesse values of TMS and FSR.The percentage error which I found out
=[(analytical value - finesse value)/analytical
value]*100
 fitting_1.pdf 
  13944   Mon Jun 11 22:05:03 2018 KojiUpdateelogComparison of the analytical and finesse values of TMS and FSR.> The percentage error which I found
out =[(analytical value - finesse value)/analytical
value]*100
  
  13945   Mon Jun 11 22:18:18 2018 keerthanaUpdateelogComparison of the analytical and finesse values of TMS and FSR.Oopss !! I made a mistake while taking
the values from my notes. Sorry.

  
  3339   Sat Jul 31 04:03:11 2010 GopalSummaryOptic StacksComplete Displacement Translational Transfer Function MatrixOver the past 36 hours, I've run full-fledged
FDAs on KALLO.
 Progress_Report_2.png 
  16647   Fri Feb 4 10:21:39 2022 AnchalSummaryGeneralComplete lab shutdownPlease edit this same
entry throughout the day for the shutdown
 Vac_Status_Screenshot_2022-02-04_10-19-24.png 
  17080   Mon Aug 15 15:43:49 2022 AnchalUpdateGeneralComplete power shutdown and startup documentationAll steps taken have been recorded here:
https://wiki-40m.ligo.caltech.edu/Complete_power_shutdown_2022_08
  
  15204   Mon Feb 10 15:54:47 2020 JordanUpdatePSLCompleted Acromag WiringAll spare channels on the PSL acromag chassis
are connected with ~12in of spare wiring
for future use.
  
  4913   Wed Jun 29 22:35:06 2011 NicoleSummarySUSCompleted Quad photodiode Box Circuit DiagramsI have finished
drawing the circ
 summingcircuit.jpgQPDYcircuit.jpgQPDX_2circuit.jpg 
  3180   Thu Jul 8 16:24:30 2010 GopalUpdateOptic StacksCompletion of single stack layerSingle layer of stack successfully modeled
in COMSOL. I'm working on trying to add Viton
springs now and extend it to a full stack.
  
  9708   Mon Mar 10 21:12:30 2014 KojiSummaryLSCComposite Error Signal for ARms (1)The ALS error (i.e. phase tracker output)
is linear everywhere, but noisy. 
The 1/sqrt(TR) is linear and less
 composite_linear_signal.nb.zip 
  9715   Tue Mar 11 15:14:34 2014 denSummaryLSCComposite Error Signal for ARms (1)

    

       
            
  
  9717   Tue Mar 11 15:21:08 2014 KojiSummaryLSCComposite Error Signal for ARms (1)True. But we first want to realize this
for a single arm, then move onto the two
arms case. 
  
  9710   Mon Mar 10 21:14:58 2014 ericqSummaryLSCComposite Error Signal for ARms (3)Using Koji's mathematica notebook, and
Nic's python work, I set out to run a time
domain simulation of the error signal, with
 model.pngsimSweep.pdfalsSweep.pdf 
  9751   Wed Mar 26 11:16:59 2014 ericqSummaryLSCComposite Error Signal for ARms (3)Extending the previous model, I've closed
a rudimentary CESAR loop in simulink. Error
signals with varying noise levels are combined
 simlink.pdfsimulatedCESARLock.pdf 
  9711   Mon Mar 10 21:16:13 2014 KojiSummaryLSCComposite Error Signal for ARms (4) The LSC model was modified for CESAR.
A block called ALSX_COMBINE was made
in the LSC block. This block receives the
 ss1.pngss2.pngCESAR_OFFSETS.pdf 
  9712   Mon Mar 10 21:16:56 2014 KojiSummaryLSCComposite Error Signal for ARms (5) After making the CDS modification, CESAR
was tested with ALS.
First of all, we run CESAR with threshold
  
  9718   Tue Mar 11 18:33:21 2014 KojiUpdateLSCComposite Error Signal for ARms (6) Today we modified the CESAR block.
- Now the sign(X) function is in
a block.
 14.png 
  9719   Tue Mar 11 18:34:11 2014 JenneUpdateLSCComposite Error Signal for ARms (7)[Nic, Jenne, EricQ, and Koji]
We
have used CESAR successfully to bring the
 spectra-ungarble.pdfScreenshot-1.pngScanFromOffToOnResonance.pdfScanThroughResonance.pdf 
  9724   Thu Mar 13 01:18:00 2014 JenneUpdateLSCComposite Error Signal for ARms (8)[Jenne, EricQ]
As Koji suggested in his email this
afternoon, we looked at how much actuator
 7x 
  9728   Fri Mar 14 12:18:55 2014 KojiUpdateLSCComposite Error Signal for ARms (9)Asymptotic cooling of the mirror motion
with CESAR was tested.
With ALS and the full control bandwidth
 asymptotic_cooling.pdf 
  477   Wed May 14 14:05:40 2008 AndreyUpdateComputersComputer Linux-2, MEDM screen "Watchdogs"
Computer "Linux-2", MEDM screen "C1SUS_Watchdogs.adl":
there is no indication for ETMY watchdogs,
  
  447   Fri Apr 25 11:33:40 2008 AndreyConfigurationComputersComputer controlling vaccum equipment
[COLOR=blue]Old computer[/COLOR] (located
in the south-end end of the interferometer
  
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