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ID Date Author Type Category Subjectup Text Attachments
  8598   Fri May 17 18:58:58 2013 Jamie, KojiSummaryCDSWeird DAC bit flipping at half integer output valuesWhile looking at the DAC anti-imaging filters,
Koji noticed an odd feature of the DAC output:
 const.pdfsweep.pdf 
  8599   Fri May 17 19:56:52 2013 KojiSummaryCDSWeird DAC bit flipping at half integer output valuesLet me make a complimentary comment on
this effect.
Because of this oscillation feature,
  
  8613   Wed May 22 11:09:33 2013 JamieSummaryCDSWeird DAC bit flipping at half integer output valuesAfter querying CDS folks about this issue,
I got some responses that indicated the problems
was likely limit-cycle oscillations due to
 nopad.pdf 
  8614   Wed May 22 11:21:28 2013 KojiSummaryCDSWeird DAC bit flipping at half integer output valuesIs this limit cycle caused by the residual
of the digital AI filtering at the half sampling
freq and that his the threshold?
  
  8615   Wed May 22 11:35:06 2013 JamieSummaryCDSWeird DAC bit flipping at half integer output values

    

       
            
  
  8616   Wed May 22 15:08:37 2013 KojiSummaryCDSWeird DAC bit flipping at half integer output valuesIt seems that the effect is from the (linear)
residual fluctuation of the digital AI filter
for the zero-padded signal.
 Screenshot.png 
  11682   Fri Oct 9 16:43:50 2015 ericqUpdateIOOWeird IMC behaviorA few minutes ago, Gautam and I were poking
around the IOO rack, looking at where he
should power his frequency divider box, and
 IMC_oddity.png 
  16113   Mon May 3 18:59:58 2021 AnchalSummaryGeneralWeird gas leakagr kind of noise in 40m control roomFor past few days, a weird sound of decaying
gas leakage comes in the 40m control room
from the south west corner of ceiling. Attached
 40mNoiseFinal.mp3 
  16115   Mon May 3 23:28:56 2021 KojiSummaryGeneralWeird gas leakagr kind of noise in 40m control roomI also noticed some sound in the control
room. (didn't open the MP3 yet)

I'm afraid that the hard disk
  
  13207   Mon Aug 14 20:12:09 2017 Jamie, GautumUpdateCDSWeird problem with GPS receiverToday we saw a weird issue with the GPS
receiver (EndRun Technologies Tempus LX). 
GPS timing on fb1 (which is handled via IRIG-B
  
  10945   Tue Jan 27 17:58:21 2015 JenneConfigurationTreasureWelcome, Donatella!Welcome to your new abode, Donatella!  IMG_1806.JPG 
  5585   Fri Sep 30 15:22:17 2011 KatrinUpdateGreen LockingWhat happened on green YARM? 
This is a kind
  
  15080   Fri Dec 6 00:02:48 2019 gautamUpdateLSCWhat is the correct way to set the 3f offsets?Summary:

I made it to 0 CARM offset, PRMI
locked a bunch of times today. However, I
  
  15419   Fri Jun 19 17:06:50 2020 gautamUpdateLSCWhat should the short-term commissioning goals be?Summary:

 CARM_superBoost.pdf 
  15427   Wed Jun 24 17:20:16 2020 gautamUpdateLSCWhat should the short-term commissioning goals be?Per the discussion at the meeting today,
the plan of action is:


Lock the PRMI on carrier
  
  16017   Mon Apr 12 10:07:35 2021 AnchalUpdateSUSWhat's F2A??I'm not sure I understand what F2A
is? I couldn't find a description of
this filter anywhere and don't remember
  
  16020   Tue Apr 13 09:51:22 2021 ranaUpdateSUSWhat's F2A??Force to Angle. It just means the filters
that are in the POS OUTPUT matrix. I think
in the past sometimes they are called F2P
  
  11851   Sat Dec 5 12:02:25 2015 yutaroHowToCamerasWhen image capture does not work...Today image capture did not work again,
though it had worked 3 days before. I also
found that red indicator light on the
  
  11852   Sat Dec 5 21:28:33 2015 KojiHowToCamerasWhen image capture does not work...Do we need "make" everytime?
Do you mean just running "modprobe"
didn't work?
  
  11853   Sat Dec 5 21:57:32 2015 yutaroHowToCamerasWhen image capture does not work...I don't know if just running "modprobe"
will work or not, because I didn't try
it...  When the same problem happens
  
  2786   Sun Apr 11 13:51:04 2010 AlbertoOmnistructureComputersWhere are the laptops?I can't find the DELL laptop anywhere in
the lab. Does anyone know where it is?
Also one of the two netbooks is missing.
  
  2787   Sun Apr 11 19:05:34 2010 KojiOmnistructureComputersWhere are the laptops?One dell is in the clean room for the suspension
work.

  
  5714   Thu Oct 20 18:01:17 2011 JenneUpdateComputer Scripts / ProgramsWhere should the "Update Snapshots" of screens live?While trying to implement the regular yellow
shell script button in MEDM for my new OAF
screen, I noticed that the update snapshot
  
  5715   Thu Oct 20 18:42:47 2011 KojiUpdateComputer Scripts / ProgramsWhere should the "Update Snapshots" of screens live?The following directory exists.  We can
apply this convention to all of the models.
  
  2305   Fri Nov 20 11:01:58 2009 josephb, alexConfigurationComputersWhere to find RFM offsetsAlex checked out the old rts (which he
is no longer sure how to compile) from CVS
to megatron, to the directory:
  
  10595   Fri Oct 10 03:25:11 2014 JenneUpdateLSCWhich side of optical spring are we on (simulation)I have a simulated version of the differences
that we expect to see between the 2 different
sides of the CARM resonance.  The point
 10x 
  10594   Fri Oct 10 03:05:09 2014 ericqUpdateLSCWhich side of optical spring are we on? I made some measurements to try and
see if any difference could be seen with
different CARM offset signs. 
 comparison.pdf 
  10598   Mon Oct 13 12:01:28 2014 ericqUpdateLSCWhich side of optical spring are we on? I went back into the DQ channels
to look at the TF from AO injection to REFLDC
(which is easy to do with this kind of noise
 AOInjection_SqrtInv_REFLDC.pngAOinjection_SqrtInv_REFLDC.xml.zip 
  10607   Wed Oct 15 02:58:03 2014 JenneUpdateLSCWhich side of optical spring are we on? Some measurements.  Unclear meaning.
 
We tried both positive and negative
 PRFPMI_MC2injection_PosCARMoffset_REFLDC_TRX_response_14Oct2014_TRX.pdfPRFPMI_MC2injection_PosCARMoffset_REFLDC_TRX_response_14Oct2014_REFLDC.pdfPRFPMI_MC2injection_NegCARMoffset_REFLDC_TRX_response_14Oct2014_TRX.pdfPRFPMI_MC2injection_NegCARMoffset_REFLDC_TRX_response_14Oct2014_REFLDC.pdf 
  10603   Mon Oct 13 21:20:56 2014 JenneUpdateLSCWhich side of optical spring are we on? (No progress)[Jenne, Diego]
In order to distinguish between the
spring and antispring sides of the CARM resonance,
  
  10604   Mon Oct 13 21:59:47 2014 ranaUpdateComputer Scripts / ProgramsWhich side of optical spring are we on? (No progress) 
 Since no one was here, I started
the Ubuntu 10 - 12 upgrade on Rossa. It didn't
  
  10612   Wed Oct 15 19:56:38 2014 JenneUpdateLSCWhich side of optical spring are we on? Meas vs Model I have plotted measured data from
last night (elog
10607) with a version of the result from
 AntispringModel_NegOffsetMeas_comparison.pdfSpringModel_NegOffsetMeas_comparison.pdf 
  14759   Mon Jul 15 03:30:47 2019 KruthiUpdateCalibration-RepairWhite paper as a Lambertian scattererI made some rough measurements, using the
setup I had used for CCD calibration, to
get an idea of how good of a Lambertian scatterer
 BRDF_paper.png 
  15531   Mon Aug 17 23:36:10 2020 gautamUpdateALSWhitening and ALS noiseI finally managed to
install a differential-receiving whitening
board in 1Y2 - 4 channels are available at
 ALSimprovement.pdf 
  15533   Tue Aug 18 13:55:23 2020 ranaUpdateALSWhitening and ALS noiseNo, there should be no unscheduled visits
from any inspector, marshal, tech, or vendor.
They all have to be escorted or they don't
  
  15532   Mon Aug 17 23:41:50 2020 gautamUpdateBHDWhitening and air BHD dark noiseSummary:

With the chosen transimpedance
of 300 ohms, in order to be able to see the
 BHD_whitening.pdf 
  13563   Sat Jan 20 01:20:37 2018 gautamUpdateElectronicsWhitening filter D990694We use D990694
in various places. Today, Rana alerted me
to an important consideration to be kept
 whiteningBoardLimitations.pdf 
  13564   Sat Jan 20 15:57:11 2018 ranaUpdateElectronicsWhitening filter D990694this
is the note from Hartmut Grote on this
topic from 2004
  
  13568   Tue Jan 23 01:33:23 2018 gautamUpdateElectronicsWhitening filter D990694After discussing with Koji, we looked at
the aLIGO
incarnation of this board. Interestingly,
  
  13572   Wed Jan 24 00:48:47 2018 gautamUpdateElectronicsWhitening filter D990694I plan to do some characterization of this
problem. The plan is to use THD
as a metric for whether we are having hidden
  
  3790   Tue Oct 26 22:57:37 2010 JenneConfigurationComputersWhy doesn't DTT work?!?DTT has only SUS and "X02" channels
under C1 in the drop down channel selection
menu.  Basically, we can't measure any
  
  3793   Wed Oct 27 10:53:03 2010 josephbConfigurationComputersWhy doesn't DTT work?!?Test points for the SUS channels should
be there.  They have been working previously
this week.  Possibly break down points
  
  4027   Wed Dec 8 14:46:19 2010 josephb, kiwamuUpdateCDSWhy the ETMX daq channels were not recorded last nightWhen adding
the ETMX DAQ channels using the daqconfig
gui (located in /opt/rtcds/caltech/c1/scripts/)
  
  14829   Mon Aug 5 17:23:26 2019 gautamSummaryComputersWiFi Settings on asiaThe VEA laptop asia was configured to be
able to connect to too many WiFi networks
- it was getting conflicted in its default
  
  13905   Thu May 31 19:51:06 2018 KojiUpdateGeneralWiFi router firmware update / rebootingThe model of our martian wifi router (NETGEAR
R6400) was found in the FBI router list to
be rebooted asociated with the malware "VPNFilter"
  
  2664   Tue Mar 9 09:32:31 2010 KojiSummaryGeneralWideband measurement of Fast PZT responseI have measured a wideband response
of the fast PZT in the LWE NPRO 700mW in
the Alberto's setup.
 PZT_response.png 
  1105   Sun Nov 2 20:44:58 2008 ranaUpdateASSWiener Filter performance over 5 hoursI took one 2 hour stretch of data to calculate
a MISO Wiener filter to subtract the Ranger
seismometer
 f.pngf1.png 
  1111   Mon Nov 3 22:35:40 2008 ranaUpdateASSWiener Filter performance over 5 hours[FONT=Comic Sans MS]To speed up the Wiener
filter work I defined a 256 Hz version of
the original 16kHz IOO-MC_L signal. The
 DAQ.pdf 
  1112   Tue Nov 4 00:47:53 2008 ranaUpdateASSWiener Filter performance over 5 hoursSame as before, but now with a working Ranger
seismometer.
 f2.pngf.png 
  5102   Wed Aug 3 02:28:08 2011 Manuel, IshwitaUpdateWienerFilteringWiener Filtering in X-armWiener Filtering was applied on the data
collected from the X-arm during the time:
GPS
 WFgur1X1Y2X2YN20000srate2048.pngWFgur2XN20000srate2048.pngWFgur2YN20000srate2048.pngSchermata-6.pngSchermata-7.png 
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