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ID Date Author Typeup Category Subject Text Attachments
  15593   Tue Sep 22 00:14:43 2020 anchalSummaryALSALS noise budget updateThis is not a reply to comments
given to the last post; Still working on
incorporating those suggestions.
 ALS_NoiseBudgetUpdate.pdfALS_controls.yaml 
  15594   Tue Sep 22 12:14:42 2020 ranaSummaryALSALS noise budget updateThis ALS loop is not stable. Its one of
those traps that comes from using only the
Bode plot to estimate the loop stability.
  
  15601   Wed Sep 23 11:13:49 2020 anchalSummaryALSALS noise budget updateYes, that loop was unstable. I started
using the time domain response to check for
the stability of loops now. I have been able
 ALS_NoiseBudgetUpdate.pdfALS_controls.yaml 
  15617   Wed Oct 7 16:56:23 2020 anchalSummaryALSALS noise budget update - Updated AUX PDH Loop valuesAUX PDH Loop update

I
used D1400293
to get the latest logged details about the
 Extract_X_AUX_PDH_Model.zipALS_NoiseBudgetUpdate.pdf 
  15619   Thu Oct 8 11:59:52 2020 ranaSummaryALSALS noise budget update - Updated AUX PDH Loop valuesFor all the loops where we drive the NPRO
PZT, there is some notch/resonance feature
due to the PZT mechanical resonance. In the
  
  15622   Fri Oct 9 18:32:14 2020 anchalSummaryALSALS noise budget update - Updated AUX PDH Loop valuesThe only two PZT Phase modulation transfer
function measurements I could find are 40m/15206
  
  15626   Wed Oct 14 17:03:55 2020 anchalSummaryALSALS noise budget update - Added whitening filter for ADCKoji recommended that I can add whitening
filters to suppress ADC noise easily. I added
a filter before ADC in ALS loop with 4 zeros
 ALS_NoiseBudgetUpdate.pdf 
  15629   Thu Oct 15 13:48:58 2020 anchalSummaryGeneralLab Entry NotificationI entered 40m today at around 1:20 pm and
left by 1:45 pm. I entered 104 through the
machine shop entry. I did the following:
  
  15630   Thu Oct 15 20:00:23 2020 KojiSummaryGeneralHEPA AC cord replacementThe AC cord from the PSL HEPA variac
to the junction box was replaced.
Now the HEPA is running at 70%
 P_20201015_200732.jpgP_20201015_200752.jpgP_20201015_202615.jpgP_20201015_204234.jpg 
  15632   Fri Oct 16 19:44:41 2020 anchalSummaryGeneralLab Entry NotificationI entered 40m today at around 1:10 pm and
left by 1:50 pm. I entered 104 through the
machine shop entry. I took top view single
  
  15635   Tue Oct 20 20:12:18 2020 KojiSummaryGeneralDJI OSMO Pocket Camera KitI set up an action cam (DJI OSMO Pocket)
and brought it back to the 40m. The kit is
now placed in the control room cabinet together
 20201020200929_IMG_0173.JPG 
  15642   Fri Oct 23 19:01:57 2020 KojiSummaryPEMPSL Particle Counter kit removed from the tableThe particle counter on the 40m PSL was
removed. The package was made together with
the OMC lab particle counter (see the packing
 P_20201022_173529.jpgP_20201022_173419.jpg 
  15650   Thu Oct 29 09:50:12 2020 anchalSummaryCalibrationPreliminary calibration measurement takenI went to 40m yesterday at around 2:30
pm and Koji showed me how to acquire lock
in different arms and for different lasers.
 PreliminaryCalibrationData.pdf 
  15687   Mon Nov 23 23:27:43 2020 KojiSummaryASCQ3000 characterizationLast week and this week I've been working
on the characterization of the Q3000 QPDs.
The QPDs were named 81, 82, 83, and 94.
  
  15693   Wed Dec 2 12:35:31 2020 PacoSummaryComputer Scripts / ProgramsTC200 python driver Given the similarities between the MDT694B
(single channel piezo controller) and TC200
(temperature controller) serial interfaces,
  
  15694   Wed Dec 2 15:27:06 2020 gautamSummaryComputer Scripts / ProgramsTC200 python driver FYI, there is this.
Seems pretty well maintained, and so might
be more useful in the long run. The available
  
  15774   Wed Jan 20 18:07:09 2021 AnchalSummaryBHDHAM-A Coil Driver measurements before modificationsI have taken transfer functions and noise
measurements of the two HAM-A coil driver
boxes D1100687 #S2100027 and #S2100028. All
 7x 
  15776   Mon Jan 25 18:18:04 2021 AnchalSummaryBHDSatellite Amplifier Transfer Functions and noise 

I took transfer function and noise
measurement of satellite amplifier box's
 D1002818_S2100029_TFandNoiseSpectrum.pdfD1002818_Testing.zip 
  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 
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