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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Category Subjectdown Text Attachments
  59   Sat Nov 3 16:20:43 2007 waldmanSummaryOMCA good day's work
I followed up yesterday's test of the PZT
with a whole mess of characterizations of
 6x 
  4376   Fri Mar 4 03:31:35 2011 kiwamuUpdateGreen LockingA first noise budgetI made a noise budget for the ALS noise
measurement that I did a week ago (see
#4352).
 noise_budget.png 
  15562   Mon Sep 7 23:49:14 2020 gautamUpdateBHDA first look at RF44 schemeSummary:

Over the last couple of days, I've
been working towards getting the infrastructure
  
  15563   Tue Sep 8 01:31:43 2020 KojiUpdateBHDA first look at RF44 scheme- Loose fiber coupler: Sorry about that.
I could not detect something was loose there,
although some of the locks were not tightened.
  
  6414   Wed Mar 14 13:16:50 2012 kiwamuUpdateLSCA correction on Noise estimatino in the REFL33QA
correction on the previous elog about the
REFL33Q noise:
  
  1286   Mon Feb 9 17:09:51 2009 YoichiUpdateComputersA bunch of updates for the network GPIB stuff.During the work on ISS, we noticed that netgpibdata.py
is very unreliable for SR785.
The problem was caused by flakiness of the
  
  15820   Thu Feb 18 20:24:48 2021 KojiSummaryElectronicsA bunch of electronics receivedTodd provided us a bunch of electronics.
I went to Downs to pick them up this afternoon
and checked the contents in the box. Basically,
 IMG_0416.jpeg 
  15828   Sat Feb 20 10:01:48 2021 gautamSummaryElectronicsA bunch of electronics receivedWill we also be receiving the additional
34 Satellite Amplifier PCBs?
  
  15830   Sat Feb 20 16:46:17 2021 KojiSummaryElectronicsA bunch of electronics receivedWe received currently available sets. We
are supposed to receive more coil drivers
and sat amps, etc. But they are not ready
  
  15866   Fri Mar 5 00:53:09 2021 KojiSummaryElectronicsA bunch of electronics receivedReceived additional front/rear panels.
Updated the original entry and Wiki [Link]

 
  
  15868   Fri Mar 5 15:03:28 2021 gautamSummaryElectronicsA bunch of electronics receivedThe PCBs for the D1002593
BIO I/F (5pcs ea of D1001050
and D1001266)
  
  15870   Fri Mar 5 15:32:53 2021 KojiSummaryElectronicsA bunch of electronics receivedThe parts will be ordered by Koji
The components for the additional BIO I/F
have been ordered.
  
  15981   Wed Mar 31 03:56:37 2021 KojiSummaryElectronicsA bunch of electronics receivedWe have received 9x 18bit DAC adapter boards
(D1000654)
 P_20210331_013257.jpgP_20210331_014020.jpg 
  10038   Fri Jun 13 19:09:44 2014 KojiUpdateIOOA blown fuse found on the euro card crate at 1X2 (IOO) rack.[Rana Zach Koji]
We tracked down the MC locking issue
to be associated with the power supply problem.
  
  4486   Mon Apr 4 18:58:44 2011 BryanConfigurationGreen LockingA beam of purest greenWe now have green light at the Y end. 
The set-up (with careful instructions
 P4040042.JPG 
  3942   Wed Nov 17 23:45:20 2010 JenneUpdateSUSA bad day for suspensions[Jenne, Suresh]
Today has been a downright miserable
day in the world of suspension work. Thumbs
 StatusTable.png 
  2364   Tue Dec 8 09:18:07 2009 JenneUpdateComputersA *great* way to start the day....Opening of ETMY has been put on hold to
deal with the computer situation.  Currently
all front end computers are down.  The
  
  7587   Mon Oct 22 09:10:07 2012 SteveUpdateVAC@750Torr

    

       
            
 ventOct222012.png 
  1659   Sat Jun 6 01:44:53 2009 rob UpdateLocking?Lock acquisition is proceeding smoothly
for the most part, but there is a very consistent
failure point near the end of the cm_step
  
  1660   Sun Jun 7 04:57:39 2009 YoichiUpdateLocking?


   
        
            
  
  1663   Tue Jun 9 23:25:24 2009 robUpdateLocking?


   
        
            
  
  11685   Tue Oct 13 05:48:39 2015 ericqUpdateLSC:/[ericq, Gautam]

Despite our best efforts, the grappa
remains out of reach: the DRFPMI was not
  
  4237   Wed Feb 2 03:27:20 2011 KojiSummaryGreen Locking85MHz Freq dividerThe freq divider was built and installed
in the beat detection path.
Attachment 1: Circuit diagram
 freq_divider.pdfIMG_3816.JPGIMG_3818.JPG 
  3803   Thu Oct 28 03:07:53 2010 kiwamuUpdateGreen Locking80MHz VCO for green PLL : a health check I
did a health check for a 80MHz VCO box. 
 VCO_LPF_fit.png 
  3820   Fri Oct 29 06:20:20 2010 kiwamuUpdateGreen Locking80MHz VCO for green PLL : VCO calibration I calibrated the VCO frequency
as a function of the applied input voltage.
 calibration.png 
  3898   Thu Nov 11 17:47:36 2010 kiwamuUpdateGreen Locking80MHz VCO : improve PLL hold-in range and put a boostIn order
to enlarge the hold-in range I modified the
 vco_pll.pngVCO_lfb.png 
  3896   Thu Nov 11 13:54:05 2010 kiwamuUpdateGreen Locking80MHz VCO : about PLL hold-in range

The hold-in
 range_green.pngPLL.png 
  3879   Mon Nov 8 10:48:58 2010 kiwamuUpdateGreen Locking80MHz VCO : PLL open loop looks good   vco_pll.pngVCO_PLL.png 
  3881   Mon Nov 8 16:03:46 2010 kiwamuUpdateGreen Locking80MHz VCO : PLL open loop looks good


   
        
            
  
  3397   Wed Aug 11 11:51:45 2010 Gopal UpdateWIKI-40M Update8.5.10 - 8.11.10 Weekly UpdateSummary of
this Week's Activities:
  
  12511   Wed Sep 21 09:04:57 2016 SteveUpdateGeneral8 hours recovery progressGood 8 hours




 8hrs.png 
  5619   Tue Oct 4 20:34:20 2011 KatrinUpdateGreen Locking7kHz Peak in servo input YARM[Kiwamu, Katrin]
As reported earlier an oscillation
around 7kHz is an the PDH error signal. The
 servoinput.pngservoinput2.png 
  7077   Thu Aug 2 04:58:00 2012 MashaUpdatePEM70 Meter Long Guralp 1 CableThe parts Jenne and I ordered arrived today,
so we made a
 BeforeCable.pngAfterCable.pngNewCableStrip.pngNewCableFreq.png 
  3219   Wed Jul 14 13:03:04 2010 Gopal UpdateWIKI-40M Update7.8.10 - 7.14.10 Weekly UpdateSummary of this Week's Activities:
Wed. 7/7: COMSOL Busbar tutorials;
began stack design; began base; Viton rubber
  
  3363   Wed Aug 4 20:58:22 2010 GopalUpdateWIKI-40M Update7.28.10 - 8.4.10 Weekly UpdateSummary
of this week's activities:
  
  3307   Wed Jul 28 12:31:00 2010 GopalUpdateWIKI-40M Update7.21.10-7.28.10 Weekly UpdateSummary of this week's activities:
7/21: Frequency Domain Analysis of
rectangular bar; discussed with Koji how
  
  3255   Wed Jul 21 11:57:59 2010 GopalUpdateWIKI-40M Update7.14.10-7.21.10 Weekly UpdateSummary of this week's activities:
7/14: Analytical calculation of Viton
spring constant; updated Viton values in
  
  5657   Wed Oct 12 18:54:02 2011 KatrinUpdateGreen Locking60 Hz oscillation due to broken BNC cableThere was a 60 Hz and 120 Hz oscillation
on the green PDH photo diode output. After
a long search, I could identify that
  
  17431   Fri Jan 27 19:35:31 2023 yutaSummaryBHD60 Hz noise investigations around IMCSo far different measurements are consistent
with the hypothesis that the 60 Hz noise
is from PSL frequency noise (40m/17423).
 6x 
  6127   Sat Dec 17 00:00:03 2011 kiwamuUpdateGreen Locking60 Hz line nose gone

    

       
            
  
  17413   Mon Jan 23 22:51:17 2023 yutaSummaryBHD60 Hz harmonics side lobe investigations[Paco, Yehonathan, Yuta]

Since we have installed BH44, we
are seeing side lobes of 60 Hz + harmonics
 Screenshot_2023-01-24_11-43-40_POXPOYDark.png 
  3752   Thu Oct 21 12:15:02 2010 ranaUpdatePEM6.9 Mag EQ in Gulf of California

   
        
            Magnitude
  
  3166   Wed Jul 7 11:35:59 2010 GopalUpdateWIKI-40M Update6.30.10 - 7.7.10 Weekly Update Summary of this Week's Activities:
6/30: 2nd and 3rd drafts of Progress
Report
  
  3142   Wed Jun 30 11:35:06 2010 Gopal UpdateGeneral6.23.10 - 6.30.10 Weekly UpdateSummary of this Week's Activities:
6/23: LIGO Safety Tour; Simulink
Controls Tutorial
  
  3103   Wed Jun 23 12:31:36 2010 GopalUpdateGeneral6.16.10-6.23.10 Weekly UpdateSummary of This Week's Activities:
6/16: LIGO Orientation; First Weekly
Meeting; 40m tour with Jenne; Removed WFS
  
  11139   Fri Mar 13 03:10:35 2015 JenneUpdateLSC6+ CARM->REFL transitions, 1 DARM->AS transitionMuch more success tonight. 
I only started my tally after I got the CARM
 AS55whitening_lockloss_12March2015.pdfMoreDARMB_powerWentDown_12March2015.pngcarm_cm_up_zip.sh.gz 
  11140   Fri Mar 13 14:11:59 2015 ranaUpdateLSC6+ CARM->REFL transitions, 1 DARM->AS transitionSince the DARM_OUT signal is only 500 counts_peak,
I don't see why AS55 whitening needs
to be switched on.
  
  12392   Wed Aug 10 15:34:24 2016 SteveUpdateSUS6 in-lbs torque driver for wire clamp screwThe 7.5 in-lb of Wiha seems at the upper
end of torque range for a 4-40 SS screw

Wiha 28502 ordered with range 5
  
  11596   Mon Sep 14 23:12:49 2015 ericqUpdateLSC55MHz modulation phase effect on PRMIWith the adjustable delay line box installed
in the 55MHz modulation path, I've
measured the PRMI sensing matrix as a function
 PRMI_CAR_0ns.pdfPRMI_CAR_4ns.pdfdelaySweep_nominal.pdf55delay_PRMI_REFL33.pdf 
  11173   Wed Mar 25 18:48:11 2015 KojiSummaryLSC55MHz demodulators inspection[Koji Den EricG]

We inspected the {REFL, AS, POP}55
demodulators.
  
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