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ID Date Author Typeup Category Subject Text Attachments
  15780   Thu Jan 28 12:53:14 2021 AnchalSummaryBHDHAM-A Coil Driver measurements before modificationsI took some steps to reduce the coupling
of 60 Hz harmonics in noise measurement.
The box was transferred to the floor instead
 D1100117_S2100027_Current_Noise_Spectrum.pdfD1100117_S2100027_Voltage_Noise_Spectrum.pdfD1100117_S2100028_Current_Noise_Spectrum.pdfD1100117_S2100028_Voltage_Noise_Spectrum.pdfSpectrumMeasurement.zip 
  15781   Thu Jan 28 18:04:55 2021 AnchalSummaryBHDHAM-A Coil Driver measurements After modificationsI did the recommended
modifications on of the boards with serial
number S2100028. These included:
 D1100117_S2100027_TF.pdfAfterChanges.zip 
  15782   Thu Jan 28 21:44:45 2021 gautamSummaryBHDHAM-A Coil Driver measurements After modificationsLooks fine to me visually but the verdict
can only be made once the z:p locations are quantitatively confirmed,
and the noise tests pass. It would be interesting
  
  15784   Fri Jan 29 15:39:30 2021 AnchalSummaryBHDHAM-A Coil Driver measurements After modifications TF and Noise S2100027I fitted zeros and poles in the measured
transfer function of D1100687 S2100027 and
got zeros at 130 Hz and 234 Hz and poles
 D1100687_S2100027_After_Modifications_Jan28.jpgD1100117_S2100027_TF.pdfD1100117_S2100027_Voltage_Noise_Spectrum.pdfD1100117_S2100027_Current_Noise_Spectrum.pdfAfterChanges.zip 
  15787   Tue Feb 2 11:57:46 2021 AnchalSummaryBHDHAM-A Coil Driver measurements After modifications TF and Noise S2100028I have made the modifications on the other
board D1100687 S2100028 as well. The measurements
were taken as mentioned in 40m/15784.
 D1100687_S2100028_After_Modifications_Feb01_2021.jpgD1100117_S2100028_TF.pdfD1100117_S2100028_Voltage_Noise_Spectrum.pdfD1100117_S2100028_Current_Noise_Spectrum.pdfAfterChanges.zip 
  15793   Wed Feb 3 16:27:19 2021 AnchalSummaryBHDSatellite Amplifier Transfer Functions and noise After modificationsI have made modifications recommended in
this doc.
The changes made are:
 D1002818_S2100029_TFAfterChanges.pdfD1002818_S2100029_OutputNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefferedNoiseSpecAfterChanges.pdfD1002812_S2100029_After_Modifications_Feb3.jpgAfterChanges.zip 
  15797   Wed Feb 10 11:45:59 2021 AnchalSummaryBHDSatellite Amplifier Very Low frequency noise After modificationsAs suggested, I wrapped the satellite amplifier
box D10028128 S2100029 in blanket and foam
and took very low frequency spectrum starting
 6x 
  15799   Wed Feb 10 15:07:50 2021 AnchalSummaryBHDSatellite Amplifier Output Offset measurementsI measured the output DC voltage of the
satellite amplifier box at PDMon port when
the PDA input was shorted
  
  15800   Wed Feb 10 15:25:45 2021 gautamSummaryBHDSatellite Amplifier Output Offset measurementsWhy not just do this test with the dummy
suspension box and CDS system? I think Rich's
claim was that the intrinsic LED RIN was
  
  15801   Wed Feb 10 17:18:03 2021 KojiSummaryBHDSatellite Amplifier Output Offset measurementsTesting the satellite amp i.e. 
PD driver
- To test the noise of the PD transimpedance
  
  15803   Thu Feb 11 11:10:05 2021 AnchalSummaryBHDSatellite Amplifier Very Low frequency noise After modificationsHere is a proper measurement for PD transimpedance
amplifier circuit in the Satellite amplifier
box D1002818 S2100029. The input from rear
 AfterChangesSpectrum_AC.zipD1002818_S2100029_OutputNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefCurrentNoiseSpecAfterChanges.pdfD1002818_S2100029_InputRefDispNoiseSpecAfterChanges.pdf 
  15804   Thu Feb 11 16:58:52 2021 ranaSummaryBHDSatellite Amplifier Very Low frequency noise After modificationsI expect that a single OSEM channel can't
be better than 1e-10 m/rHz above 5 Hz, so
probably something wrong in the calibration.
  
  15815   Thu Feb 18 03:20:09 2021 KojiSummaryElectronicsCurrent Rack MapFor your planning:  rack_plan.pdf 
  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
  
  15836   Tue Feb 23 23:12:37 2021 KojiSummarySUSSUS invacuum wiringThis is my current understanding
of the in-vacuum wiring:
1. Facts
 SOS_OSEM_cabling.pdf 
  15851   Mon Mar 1 11:40:15 2021 Anchal, PacoSummaryIMCgetting familiar with IMC controls[Paco, Anchal]

tl;dr: Done no harm, no
lasting change.
  
  15852   Mon Mar 1 12:36:38 2021 gautamSummaryIMCgetting familiar with IMC controlsPretty minor thing - but PMCT and PMCR
were switched on Quad 2 for whatever reason.
I switched them back because I prefer the
  
  15861   Thu Mar 4 10:54:12 2021 Paco, AnchalSummaryLSCPOY11 measurement, tried to lock Green Yend laser[Paco, Anchal]

- First ran burtgooey as last time.

- Installed pyepics on base environment
 20210304_POY11_Spectrum_YARMLocked.pdf20210304_POY11_Spectrum_YARMLocked.tar.gz 
  15862   Thu Mar 4 11:59:25 2021 Paco, AnchalSummaryLSCWatchdog tripped, Optics damped backGautam came in and noted that the optics
damping watchdogs had been tripped by a >5
magnitude earthquake somewhere off the coast
  
  15863   Thu Mar 4 15:48:26 2021 KojiSummaryPEMWatchdog tripped, Optics damped backEQs seen on Summary pages
https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20210304/pem/seismic_blrms/
  
  15865   Thu Mar 4 23:57:35 2021 KojiSummaryElectronicsInspection of the new custom dsub cablesI made the inspection of the new custom
DSub cables (came from Texas).

The shelled version gives us some
 6x 
  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.
  
  15877   Mon Mar 8 12:01:02 2021 Paco, AnchalSummarytrainingInvestigate how-to XARM locking[Paco, Anchal]

- Started zoom stream; thanks to
whoever installed it!
  
  15878   Mon Mar 8 12:40:35 2021 gautamSummarytrainingInvestigate how-to XARM lockingFor the arm locking, the "Restore
Xarm (XARM POX)" script from the "IFO_CONFIGURE"
MEDM screen should get you there (I just checked
  
  15881   Mon Mar 8 19:22:56 2021 ranaSummarySUSIMC suspension characterizationHerewith,
I describe an adventure
  
  15884   Tue Mar 9 10:57:06 2021 Paco, AnchalSummaryIMCXARM lock and POX spectra[Paco, Anchal]

- Upon arrival, MC is locked, and
we can see light in MON5 (PRM) (usually dark).
 20210309_POX11_Spec_XARMLocked.pdf20210309_XARM_Locked.tar.gz 
  15885   Tue Mar 9 12:41:29 2021 KojiSummaryElectronicsInvestigation on the invacuum Dsub cablesI believe the aLIGO style invac dsub cables
and the conventional 40m ones are incompatible.
While the aLIGO spec is that Pin1
 SOS_OSEM_cabling.pdf 
  15887   Tue Mar 9 14:37:26 2021 gautamSummarySUSPRM suspensionThe PRM got tripped ~5AM this morning.
The cause is unclear - the seismometer reports
elevated activity ~10 minutes before the
 PRMtrip.png 
  15889   Tue Mar 9 15:22:56 2021 KojiSummarySUSPRM suspensionI just saw the PRM watchdog tripped
at ~15:20 local (23:20UTC). I restored
the PRM but I saw only the side watchdog
  
  15893   Wed Mar 10 11:46:22 2021 Paco, AnchalSummaryIMCIMC free swinging prep[Paco, Anchal]

# Initial State
- MC is locked. The PRM monitor shows
  
  15895   Wed Mar 10 15:00:16 2021 gautamSummaryIMCIMC free swinging prepDid you fix this issue? It is helpful to
post a screenshot of the offending MEDM screen
in addition to witticisms. The elog says
  
  15896   Wed Mar 10 15:29:58 2021 AnchalSummaryIMCIMC free swinging prepNo we didn't fix the issue. We'll
post some screenshots tomorrow. From "sitemap>Shutter>PSL"
we meant in Shutter medm window, we clicked
  
  15897   Wed Mar 10 15:35:25 2021 Paco, AnchalSummaryIMCIMC free swinging experiment set to trigger at 5:00 amA tmux session named "MCFreeSwingTest"
will run on Rossa. This session is running
script scripts/SUS/freeSwingMC.py (also attached)
 freeSwingMC.py.zip 
  15901   Thu Mar 11 02:10:06 2021 KojiSummaryBHDBHD Platform vertical dimentionsStephen and I discussed the nominal heights
of the BHD platform components.


The beam height from the
 BHD_Platform_Vertical_Dimentions.pdf 
  15907   Fri Mar 12 03:08:23 2021 KojiSummarySUSCoil Rs & Ls for PRM/BS/SRMSummary

Per Gautam's request, I've
checked the coil resistances and inductances.
 P_20210311_224651.jpgP_20210311_225359.jpg 
  15913   Fri Mar 12 12:32:54 2021 gautamSummarySUSCoil Rs & Ls for PRM/BS/SRMFor consistency, today, I measured both
the BS and PRM actuator balancing using the
same technique and don't find as serious
 BS_actuator.pdfPRMact.pdf 
  15914   Fri Mar 12 13:01:43 2021 ranaSummarySUSCoil Rs & Ls for PRM/BS/SRMugh. sounds bad - maybe a short. I suggest
measuring the inductance; thats usually a
clearer measurement of coil health
  
  15915   Fri Mar 12 13:48:53 2021 gautamSummarySUSCoil Rs & Ls for PRM/BS/SRMI didn't repeat Koji's measurement,
but he reports the expected ~3.2mH per coil
on all the BS and PRM coils.
  
  15916   Fri Mar 12 18:10:01 2021 AnchalSummaryComputer Scripts / ProgramsInstalled cds-workstation on allegraallegra had fresh Debian 10 installed on
it already. I installed cds-workstation packages
(with the help of Erik von Reis). I checked
  
  15919   Mon Mar 15 08:55:45 2021 Paco, AnchalSummarytraining [Paco, Anchal]


Found IMC locked upon arrival.
Since
"allegra" was set up as an additional
 IMC_InputMatrixDiagonalization.pdfinputMatrixCalculationMC.tarfreeSwingMC.py.tarSUSfreeswing_1299514263.txt.tar 
  15950   Sun Mar 21 19:31:29 2021 ranaSummaryElectronicsRTL-SDR for monitoring RF noise / interferenceWhen we're debugging our RF system,
either due to weird demod phases, or low
SNR, or non-stationary noise in the PDH signals,
 Screen_Shot_2021-03-21_at_7.43.24_PM.png 
  15966   Thu Mar 25 16:02:15 2021 gautamSummarySUSRepeated measurement of coil Rs & Ls for PRM/BSMethod

Since I am mainly concerned with
the actuator part of the OSEM, I chose to
  
  15971   Sun Mar 28 14:16:25 2021 AnchalSummarySUSMC3 new Input Matrix not providing stable loopRana asked us to write out here the new
MC3 input matrix we have calculated along
with the old one. The new matrix is not working
 MC3_Input_Matrix_Diagonalization.pdf 
  15973   Mon Mar 29 17:07:17 2021 gautamSummarySUSMC3 new Input Matrix not providing stable loopI suppose you've tried doing the submatrix
approach, where SIDE is excluded for the
face DoFs? Does that give a better matrix?
  
  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 
  15989   Thu Apr 1 23:55:33 2021 KojiSummaryGeneralHEPA AC cord replacementI think
the PSL HEPA (both 2 units) are not running.
The switches were on. And the variac was
  
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