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ID Date Author Type Category Subjectup Text Attachments
  7701   Tue Nov 13 00:27:50 2012 JenneUpdateElectronicsEthernet Illuminator Control

    

       
            
  
  14414   Wed Jan 23 18:11:56 2019 gautamUpdateElectronicsEthernet Power Strip IP conflictFor the last week, I noticed that I was
unable to turn the EY chamber illuminator
on using the remote python scripts. This
  
  14418   Fri Jan 25 12:49:53 2019 gautamUpdateElectronicsEthernet Power Strip IP conflict resolvedTo avoid the annoying excercise of having
to manually toggle the illuminators, I solved
the IP conflict. Made a wiki
  
  3852   Wed Nov 3 09:32:00 2010 ranaSummaryCDSEurocard board swapping When swapping Eurocard boards, it
is safest to first turn down the power supplies
and then do the swapping. 
  
  4903   Tue Jun 28 22:07:46 2011 JamieHowToSAFETYEurocrate extender card fried (ie. Jamie did a very bad thing)IMPORTANT ELECTRONICS SAFETY
LESSON TO FOLLOW
Yesterday,
  
  8167   Tue Feb 26 09:55:46 2013 SteveUpdateSAFETYEvan receives safety trainingEvan got 40m specific safety training today.   
  6505   Sat Apr 7 01:45:02 2012 Mike J.UpdateComputersEven Better Hysteresis Model and Plots The new hysteresis model is slightly
based on the SHO equation, but with the force
being out of phase with the position by an
 hyst_v3.pnghyst_v_3.pnghyst_v_3-x(t).png 
  9674   Tue Feb 25 18:16:22 2014 JenneSummaryLSCEven more violin filtersA new violin mode at 1303 Hz was ringing
up this afternoon.  Rana and I added
a notch for this.
 PRMvio2.png 
  2189   Fri Nov 6 00:40:29 2009 AlbertoUpdateLSCEverything put back as it wasI disconnected the setup for the arm cavity
TF measurement. I opened the scitation switch
on the ISS medm screen. I reconnected the
  
  2217   Mon Nov 9 15:11:02 2009 AlbertoUpdateLSCEverything put back as it was


   
        
            
  
  4187   Sat Jan 22 01:56:04 2011 SureshUpdateGreen LockingExamining the stability of VCO PLL at low frequencies[Kiwamu,
Suresh, Rana]
Our
 VCO_PLL_stability.pngVCO_PLL_stability.png 
  4188   Sat Jan 22 02:03:55 2011 KojiUpdateGreen LockingExamining the stability of VCO PLL at low frequenciesDamn.
If this figure is true, we were looking at
wrong signal. We should look at the feedback
  
  3090   Sat Jun 19 17:31:48 2010 ranaDAQCDSExcess Noise in C1:IOO-MC_DRUM1 fixed by rebootI was getting an excess noise in the C1:IOO-MC_DRUM1
channel - it was a flat spectrum of 10 cts/rHz
  
  6007   Fri Nov 25 18:45:31 2011 Den, RanaSummarySUSExcess Noise in Digital FilteringWe are now trying to understand why the
coherence between SUS-X_SUSPOS_IN1 and SUS-X_SUSPOS_OUT
is lost below 1 Hz for X = MC1, MC2, MC3,
 FiltNoise.png 
  6008   Fri Nov 25 19:45:36 2011 Mirco, DenSummarySUSExcess Noise in Digital Filtering


   
        
            
 sus_coh-crop.pdflsc_coh-crop.pdf 
  15641   Fri Oct 23 16:41:06 2020 KojiUpdateIOOExcess laser freq noise investigation[Koji, Rana]

We wanted to track down the excess
noise seen in MC_F and other places (see
 plot.pdf 
  15643   Mon Oct 26 13:35:58 2020 KojiUpdateIOOExcess laser freq noise investigationIn fact, the problem was the grounding
issue (presumably on the IOO racks).
A temporary differential receiver
 6x 
  15644   Mon Oct 26 17:26:26 2020 gautamUpdateIOOExcess laser freq noise investigationApart from the questionable wiring on the Acromags,
one other important difference is in the
way the connections were made between the
  
  15259   Fri Mar 6 01:19:19 2020 gautamUpdateIOOExcess laser frequency noiseSummary:

Sometime between 1PM and 6PM on
Tuesday, excess laser frequency noise
 MCF.pdfExcessFreqNoise.pdfALSnoise.pdf 
  15260   Fri Mar 6 16:33:11 2020 gautamUpdateIOOExcess laser frequency noiseI did some preliminary debugging of this,
and have localized the problem to the output
path (after MC slow) on the IMC Servo card.
  
  16329   Tue Sep 14 17:19:38 2021 PacoSummaryPEMExcess seismic noise in 0.1 - 0.3 Hz bandFor the past couple of days the 0.1 to
0.3 Hz RMS seismic noise along BS-X has increased.
Attachment 1 shows the hour trend in the
 SEIS_2021-09-14_17-33-12.png 
  16331   Tue Sep 14 19:12:03 2021 KojiSummaryPEMExcess seismic noise in 0.1 - 0.3 Hz bandLooks like this increase is correlated
for BS/EX/EY. So it is likely to be real.

Comparison between 9/15
 C1-ALL_393F21_SPECTRUM-1315699218-86400.pngC1-ALL_393F21_SPECTRUM-1315267218-86400.png 
  5623   Wed Oct 5 18:31:02 2011 KatrinUpdateGreen LockingExchanged mirror on YARM tableOn the Green YARM end table the second
mirror behind the laser has been exchanged.
Reason: The light is impinging on
  
  8900   Tue Jul 23 04:07:48 2013 gautamUpdateCDSExcitation points set up on c1scx 
 In
light of recent events and the decision to
  
  8909   Tue Jul 23 16:47:01 2013 gautamUpdateCDSExcitation points set up on c1scx I just compiled and installed the
model with the excitation points on c1scx
and then restarted framebuilder. The channels
  
  1708   Sat Jun 27 03:16:16 2009 ClaraUpdatePEMExciting microphone things!So, I'm double-posting, but I figured the
last post was long enough as it was, and
this is about something different. After
 mic_voltage_out.pngvoltage_dividers.pngvoltage_divider_sketch.png 
  15763   Thu Jan 14 11:46:20 2021 gautamUpdateCDSExpansion chassis from LHOI picked the boxes up this morning. The
inventory per Fil's email looks accurate.
Some comments:
  
  15764   Thu Jan 14 12:19:43 2021 JonUpdateCDSExpansion chassis from LHOThat's fine, we didn't actually
request those. We bought and already have
in hand new PCIe x4 cables for the chassis-host
  
  15766   Fri Jan 15 15:06:42 2021 JonUpdateCDSExpansion chassis from LHOKoji asked me assemble a detailed breakdown
of the parts received from LHO, which I do
based on the high-res photos
  
  15767   Fri Jan 15 16:54:57 2021 gautamUpdateCDSExpansion chassis from LHOCan you please provide a link to this "list
of boards"? The only document I can
find is T1800302.
 Screenshot_2021-01-15_17-00-06.png 
  15770   Tue Jan 19 13:19:24 2021 JonUpdateCDSExpansion chassis from LHOIndeed T1800302 is
the document I was alluding to, but I completely
missed the statement about >3 GHz speed.
  
  7905   Wed Jan 16 18:08:06 2013 JenneUpdateLockingExpected PRC gainsI was calculating the power recycling gains
we expect for different versions of the PRC,
and I am a little concerned that we aren't
  
  7909   Wed Jan 16 20:27:16 2013 ranaUpdateLockingExpected PRC gainsWhy would we use such a bad optic in our
recycling cavity? Is 1.5% the spec for these
mirrors? Is this the requirement that Kiwamu
  
  7910   Thu Jan 17 00:17:31 2013 JenneUpdateLockingExpected PRC gains

    

       
            
  
  3224   Wed Jul 14 19:36:17 2010 GopalUpdateOptic StacksExperimental Confirmation of COMSOL AnalysisI experimentally determined the spring
constant of a single Vitol spring in
order to obtain a rough estimate for the
 Untitled.png 
  4208   Wed Jan 26 12:04:31 2011 josephbUpdateCDSExplanation of why c1sus and c1lsc models crash when the other one goes downSo apparently
with the current Dolphin drivers, when one
of the nodes goes down (say c1lsc), it causes
  
  15503   Tue Jul 28 13:55:11 2020 HangUpdateBHDExploring bilinear SRCL->DARM couplingWe explore bilinear SRCL to DARM noise
coupling mechanisms, and show two cases that
by doing BHD readout the noise performance
 SRCL_bilin_DHARD.pdfARM_RIN.pdfSRCL_bilin_SRCL.pdf 
  16100   Thu Apr 29 17:43:48 2021 AnchalUpdateCDSF2A Filters double checkI double checked today and the F2A filters
in the output matrices of MC1, MC2 and MC3
in the POS column are ON. I do not get what
 F2AFiltersON.png 
  16105   Fri Apr 30 00:20:30 2021 gautamUpdateCDSF2A Filters double checkThe SDF system is supposed to help with
restoring the correct settings, complementary
to burt. My personal opinion is that there
  
  17218   Tue Nov 1 15:41:18 2022 AnchalUpdateSUSF2A filter design and trial on MC1Following discussion in this elog thread
(40/6004),
I used the design of F2A (force to angle(pitch))
 20221101_MC1_F2A_Filters.pdfETMY_F2A_Filters_Already_There.pdfMC1_F2A_Test.png 
  6004   Thu Nov 24 20:22:42 2011 MirkoUpdateIOOF2A filter for MCI calculated the F2A filters for the input
mode cleaner optics as described in T010140-01-D
eq (4). On Ranas recommendation I added an
 UpperCoils.pdfLowerCoils.pdf 
  6006   Fri Nov 25 17:52:28 2011 ranaUpdateIOOF2A filter for MCWoo. Pretty crazy. The numerators should
only be ~10% larger than the denominator
below 1 Hz. Let's try again.
  
  6012   Fri Nov 25 23:25:24 2011 MirkoUpdateIOOF2A filter for MC


   
        
            
 F2aForMCcomparedToBS.pdf 
  6021   Mon Nov 28 10:54:40 2011 ranaUpdateSUSF2A filter for MCOur
approach to making the F2A or F2P filters
  
  17235   Mon Nov 7 16:14:43 2022 AnchalUpdateSUSF2A filter with Q=1, 0.3 stable with MC3I tired running for a few hours F2A filter
with Q=1 and for maybe 30 min Q=0.3 on MC3
today and that keeps the suspension stable.
  
  17317   Mon Nov 28 16:53:22 2022 AnchalSummaryBHDF2A filters on LO1 LO2 AS1 and AS4[Paco, Anchal]

I changed the script in /opt/rtcds/caltech/c1/Git/40m/scripts/SUS/outMatFilters/createF2Afilters.py
  
  17227   Thu Nov 3 17:36:00 2022 AnchalUpdateSUSF2A filters on MC1, MC2, and MC3 set to test at 1 am


  
  17231   Mon Nov 7 11:24:05 2022 AnchalUpdateSUSF2A filters on MC1, MC2, and MC3 set to test at 1 amThis test was not successfull as IMC lost
lock during the f2A filter trial. However,
we do have 1 hour off data when all f2A filters
 MC3_f2a_failure_analysis.pdfMC3_f2a_Failure_Event.pngMC3_f2aQ3_filters.pdf 
  989   Thu Sep 25 02:35:21 2008 ranaSummaryPSLFAST is moving alotIt looks like the FAST signal has started
moving a lot - this is partly what inspired
us to tune the SLOW loop.
 Untitled.pngUntitled.png 
  1023   Fri Oct 3 15:09:58 2008 robUpdatePSLFAST/SLOW
Last night during locking, for no apparent
reason (no common mode), the PSL FAST/SLOW
 FASTSLOW.png 
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