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  16963   Wed Jun 29 18:53:38 2022 ranaUpdateElectronicsElectronics noisethis is just the CDS error signal, but
is not the electronics noise. You have to
go into the lab and measure the noise at
  
  15980   Wed Mar 31 00:40:32 2021 KojiUpdateElectronicsElectronics Packaging for assembly workI've worked on packing the components
for the following chassis
- 5 16bit AI chassis
 P_20210330_233508.jpgP_20210330_233618.jpg 
  15986   Thu Apr 1 18:16:28 2021 KojiUpdateElectronicsElectronics Packaging for assembly workAll small
components are packed in the boxes. They
are ready to ship.

 
  
  15697   Wed Dec 2 23:07:19 2020 gautamUpdateASCElectrical LO signal for AS WFSI'm thinking of making some modifications
to the RF distribution box in 1X2, so as
to have an extra 55 MHz pickoff. Koji already
 RF_Frequency_Source.pdf 
  15700   Thu Dec 3 11:02:35 2020 ranaUpdateElectronicsElectrical LO signal for AS WFSlooks good to me.

The thing I usually look for is
how much the downstream system (mixers, etc)
  
  15702   Thu Dec 3 13:55:52 2020 KojiUpdateASCElectrical LO signal for AS WFSI got a bit confused by your description.

The demod board claims
that the nominal power at each LO port is
  
  15704   Thu Dec 3 20:38:46 2020 gautamUpdateASCElectrical LO signal for AS WFSI removed the Frequency Generation box
from the 1X2 rack. For the time being, the
PSL shutter is closed, since none of the
 RF_Frequency_Source.pdfdemodPath.pdfEOMpath.pdf 
  15705   Thu Dec 3 21:14:38 2020 KojiUpdateASCElectrical LO signal for AS WFSLet's use RG405 for better shielding.
It is not too stiff. The bending  (just
once) does not break the cable.
  
  15706   Thu Dec 3 21:44:49 2020 gautamUpdateASCElectrical LO signal for AS WFSI'm open to either approach. If the
full replacement requires a lot of machining,
maybe I will stick to just the 55 MHz line.
  
  15707   Fri Dec 4 03:02:40 2020 KojiUpdateASCElectrical LO signal for AS WFS1. That's true. But we are already
in that regime with the Var attn at 0dB,
aren't we? We can reduce the input to
  
  3207   Tue Jul 13 14:59:04 2010 GopalUpdateOptic StacksEigenfrequency Analysis of Single Stack CompleteVia reconfiguration of Viton parameters
(previously posted), I managed to debug the
COMSOL run time errors and null pointer exceptions.
 Eigenmode_Stack_4.pngEigenmode_Stack_4_xdisp.pngEigenmode_Stack_4_ydisp.pngEigenmode_Stack_4_zdisp.png 
  3199   Mon Jul 12 18:37:10 2010 GopalUpdateOptic StacksEigenfrequency Analysis of Simple ObjectsEigenfrequency analysis has been successfully
completed in COMSOL on both a tutorial camshaft,
as well as a homemade metal bar.
  
  3246   Mon Jul 19 16:11:17 2010 GopalUpdateOptic StacksEigenfrequency Analysis of Full StackExpanding on the single-layer model, I
added the second, third, and fourth layers
to the stack in COMSOL. Eigenfrequency
 Eigenfrequency_1_4Stacks.pngEigenfrequency_2_4Stacks.pngEigenfrequency_3_4Stacks.pngEigenfrequency_6_4Stacks.png 
  10630   Wed Oct 22 02:35:45 2014 JenneUpdateLSCEfforts at hopping PRMI to REFL165[EricQ, Jenne]
The first half of our evening
was spent working on CARM and DARM in PRFPMI,
  
  5906   Wed Nov 16 10:08:17 2011 SureshUpdateIOOEffect of turning on the MC2_TRANS_PIT and YAW loops in ASCI turned on the two remaining loops in
the ASC system to see if we can lock.  
I put in some ones into the WFS_OUTPUT matrix
 WFS_OUTMATRIX.pngWFS_OUTMATRIX.pngWFS_servo_err_20111115.png 
  12316   Wed Jul 20 14:03:01 2016 ericqUpdateSUSEffect of thicker ruby standoffsThe new ETMX ruby guide rods are slightly
thicker than the old aluminum ones; specifically
1.27mm vs 1.0mm.
  
  1512   Thu Apr 23 18:09:11 2009 YoichiUpdateEnvironmentEffect of cryopumpThe attached is the trend plot of the MC1
accelerometer for 3 days.
It is evident that the seismic level increased
 SeisTrend.pdf 
  9537   Wed Jan 8 13:01:48 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signalsI
ran a simulation of a double cavity with
a PRC length mismatched w.r.t. the modulation
 REFL_vs_PRClength.pdf 
  9539   Wed Jan 8 16:08:52 2014 ericqSummaryLSCEffect of PRC length mismatch on error signals [ericq,Gabriele]
So, we want an relatively quick measurement
of the PRC length error (with sign!) at the
 phaseVlength.pdf 
  9541   Wed Jan 8 19:05:30 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signals [Gabriele,
EricQ]
 
 as11.pngas55.png 
  9544   Thu Jan 9 17:58:31 2014 ericqSummaryLSCEffect of PRC length mismatch on error signals[ericq, Gabriele, Manasa]
 We wanted to perform the PRC
length measurement today with an AS11 signal,
  
  9546   Fri Jan 10 15:31:07 2014 ranaSummaryLSCEffect of PRC length mismatch on error signals 
 Its very doubtful that the
MC yaw drift matters for the IFO. That's
  
  9548   Sun Jan 12 09:57:24 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signals

    

       
            
  
  5565   Wed Sep 28 14:15:40 2011 JenneUpdateComputersEdits to c1pem, c1oaf[Mirko, Jenne]
Mirko edited c1pem to have some new
BLRMS channels.
  
  664   Sun Jul 13 22:39:16 2008 JohnSummaryGeneralEdited medm screens I've edited the FSS and PMC screens so that
red boxes are shown around the appropriate
slider if a gain or offset is not within
  
  1487   Wed Apr 15 17:11:37 2009 JenneUpdatePSLEdited c1psl.db to calibrate PMC's LO mon


Following the method in Peter's
Elog, 

I edited c1psl.db to include
the following: 


grecord(calc, "C1:PSL-PMC_LOCALC")
{
  
  1488   Thu Apr 16 11:17:56 2009 JenneUpdatePSLEdited c1psl.db to calibrate PMC's LO mon


   
        
            
  
  13275   Wed Aug 30 15:00:06 2017 gautamUpdateGeneralEdgeswitch fiber swapA couple of minutes ago, Larry W swapped
the fibers to our 40m Edgeswitch (BROCADE
FWS 648G) to a faster connection. This is
  
  8271   Mon Mar 11 17:18:00 2013 ManasaUpdateEnvironmentEarthquake: Suspensions tripped and MC realignedI found all suspensions including the MC
suspensions tripped this morning after the
earthquake.
  
  2675   Tue Mar 16 04:22:02 2010 JenneUpdateEnvironmentEarthquake, Mag 4.4 Earthquake Details

    

       
            Magnitude
 EQ_16Mar2010.png 
  2676   Tue Mar 16 05:10:39 2010 kojiUpdateEnvironmentEarthquake, Mag 4.4 Some of the suspensions got watchdog tripped
-> enabled -> damped.
The MC mirrors got slightly misaligned.
 100316_MC_SUS.png 
  323   Tue Feb 19 15:21:47 2008 AndreyUpdateSUSEarthquake tripped watchdogs in ETMY, ITMY
According to the web-page http://earthquake.usgs.gov/eqcenter/recenteqsus/Quakes/ci14351140.php
,
  
  17211   Tue Oct 25 14:29:56 2022 PacoSummarySEIEarthquake tripped SUS[Yuta, Paco, JC]

This
eq  potentially tripped ETMY, PR2,
  
  5209   Fri Aug 12 15:46:51 2011 JenneUpdateSUSEarthquake stop procedureAccording to Rana, the following is
the "new" (should always have been
used, but now we're going to enforce it)
  
  14724   Thu Jul 4 10:47:37 2019 MilindUpdateGeneralEarthquake nowThere was a magnitude 6.6 earthquake just
a few minutes ago. I am attaching photographs
of the monitor feeds for reference here.
 after_earthquake2.jpgafter_earthquake.jpg 
  1218   Thu Jan 8 20:26:17 2009 robOmnistructureGeneralEarthquake in San BernardinoMagnitude 4.5
Date-Time
  
  7229   Sun Aug 19 01:41:27 2012 MashaUpdatePEMEarthquake ClassifiedThere was a 5.6 Earthquake that occurred
near Tofino, Canada about 30 minutes ago.
It showed up rather strongly on the BLRMS.
 Earthquake_Found.png 
  6524   Thu Apr 12 00:16:38 2012 JenneUpdateEnvironmentEarthquake - moderate 

M4.7  - Santa Isabel, Mexico
2012-04-12 06:48:38 UTC
Mode
  
  7830   Fri Dec 14 03:49:02 2012 AyakaUpdateGeneralEarthquakeThere was an earthquake around 2:30 am.
Now all the mirrors except SRM are damped.
 earthquake.pngseis.pdf 
  7958   Tue Jan 29 20:28:11 2013 ericqUpdateGeneralEarly work on Mirror Mounts [Q, Chloe]
Chloe has been to the lab twice to
start up her investigations in acoustic noise
 early.pdf 
  7960   Wed Jan 30 03:01:55 2013 KojiUpdateGeneralEarly work on Mirror MountsI
can't believe that SR785 can have
such a low input noise level (<1nV/rtHz).
  
  15059   Mon Dec 2 18:20:29 2019 gautamUpdateALSEY uPDH post mixer LPFAs part of characterization, I wanted to
calibrate the EY uPDH error point monitor
into units of Hz. So I thought I'd measure
 EY_uPDH_LPF.pdfEY_uPDH_OLTF.pdf 
  15060   Mon Dec 2 20:18:18 2019 ranaUpdateALSEY uPDH post mixer LPF         
         filter
Q seems too high, 
  
  15063   Tue Dec 3 00:10:15 2019 KojiUpdateALSEY uPDH post mixer LPFI got confused. Why don't we see that
too-high-Q pole in the OLTF? 
  
  15064   Tue Dec 3 00:51:25 2019 gautamUpdateALSEY uPDH post mixer LPFI'm not sure - maybe it was measurement
error on my part, I will double check. Moreover,
the EX
  
  15066   Tue Dec 3 18:15:42 2019 gautamUpdateALSEY uPDH post mixer LPFRana and I discussed this alogrythym a
bit today - here are some bullet points,
I'll work on preparing a notebook. We
  
  15068   Tue Dec 3 21:28:24 2019 gautamUpdateALSEY uPDH post mixer LPFHere are some loop transfer functions.
I basically followed the decomposition of
the end PDH loop as was done in the multi-color
 uPDH.pdf 
  14835   Tue Aug 6 23:09:20 2019 gautamUpdateALSEY table work
Removed power monitoring PD (It
was off anyways)
Installed Steering
mirror and collimator in K6XS mount (fast
  
  14314   Wed Nov 21 16:48:11 2018 gautamUpdateCOCEY mini cleanroom setupWith Chub's help, I've setup a
mini cleanroom at EY - Attachment
#1. The HEPA unit is running on
 IMG_7174.JPG 
  14399   Tue Jan 15 10:52:38 2019 gautamUpdateSUSEY door opened[chub, bob, gautam]

We took the heavy door off the
EY chamber at ~930am.
  
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