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ID Date Author Type Categoryup Subject Text Attachments
  15493   Sun Jul 19 15:40:15 2020 gautamUpdateBHDIn-air BHD - CDS and wiring summaryAttachment
#1 shows the proposed
 wiringDiagram.pdf 
  15495   Mon Jul 20 17:55:15 2020 gautamUpdateBHDIn-air BHD - preparing the LO pathThe LO pickoff has been coupled into a
fiber with ~90% MM (8 mW / 9 mW input). While
I wait for the DCPD electronics to be found
  
  15497   Tue Jul 21 00:30:24 2020 gautamUpdateBHDIn-air BHD - LO RINAttachment
#1 shows the RIN of
 LO_RIN.pdf 
  15498   Tue Jul 21 16:41:46 2020 gautamUpdateBHDPMC assembly space I decided to use the old EY auxiliary optics
table, which is now stored along the east
arm about 10 m from the end, as a workspace
 IMG_8635.JPG 
  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 
  15505   Wed Jul 29 11:57:59 2020 ranaUpdateBHDIn-air BHD - CDS and wiring summary3. I agree - this whitening will be handy
to have for diagnostics.

4. I think in principle, we can
  
  15507   Thu Aug 6 00:34:38 2020 YehonathanUpdateBHDMonte Carlo SimulationsI've pushed an MCMC simulation to the
A+ BHD repo (filename MCMC_TFs.ipynb). The
idea is to show how random offsets around
 8x 
  15509   Fri Aug 7 11:23:47 2020 ranaUpdateBHDMonte Carlo Simulationsthat's great. I think we would like
to figure out how to present this so that
its clear what the distribution of TFs is.
  
  15512   Mon Aug 10 07:13:00 2020 YehonathanUpdateBHDMonte Carlo SimulationsI fixed some stuff in the MCMC simulation:

1. Results are now plotted as shades
from minimum to maximum. I tried making the
 8x 
  15513   Mon Aug 10 16:52:04 2020 gautamUpdateBHDWorkable setup preparedAll the details are in E2000436,
and documents linked from there, I think
an elog would be much too verbose. In summary,
  
  15514   Tue Aug 11 23:20:29 2020 gautamUpdateBHDSome first tests with air BHD setupSome tests done today:

All of these tests were done with
the PRMI locked with carrier resonant in
 PRMI_RFlock.pdfPRMI_RFlock_fullscale.pdf 
  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 
  15535   Fri Aug 21 15:27:00 2020 gautamUpdateBHDBetter BHD mode-matchingSummary:

The mode-matching between the LO
and AS beams is now ~50%.
 IMG_7548.JPGBHD_MM.pngPRMI_DCPDs.pdf 
  15539   Tue Aug 25 05:51:29 2020 YehonathanUpdateBHDMonte Carlo SimulationsI re-plotted the MCMC results as semi-transparent
lines so that probable lines stick out.

This also reveals what is behind
 8x 
  15540   Wed Aug 26 00:52:55 2020 gautamUpdateBHDBHD activitiesListing some talking points from the last
week of activity here.


  
  15545   Fri Aug 28 23:33:38 2020 gautamUpdateBHDSome more hardware changesJust a quick set of notes detailing changes
so that there are no surprises, more details
to follow.
  
  15549   Sat Aug 29 22:46:29 2020 gautamUpdateBHDNew homodyne-phase control electronicsSummary:

The electronics chain used to drive
the three elements of the PI PZT on which
 zetaDrive.pdftrekTFs.pdf 
  15553   Wed Sep 2 00:49:47 2020 gautamUpdateBHDSome notes about homodyne phaseSummary:

Using a heterodyne measurement
setup to track both quadratures, I estimated
 heterodyneMICH.pdfunwrappedPhase.pdfunwrappedPhase_zoom.pdfphaseNoisePSD.pdf 
  15554   Thu Sep 3 00:00:57 2020 gautamUpdateBHDNew patch cable installed
10m PM1064 cable was installed.
I tried a double shielding approach (photos
tmrw here),
  
  15555   Thu Sep 3 15:55:04 2020 gautamUpdateBHDPhase drift between LO and IFO after fiber replacementSummary:

After replacement of the fiber
delivering the LO beam to the airBHD setup
 LOphaseDrift.pdfphaseDrift_tempCorr.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.
  
  15565   Wed Sep 9 00:05:18 2020 gautamUpdateBHDMore notes on the RF44 schemeSummary:


With the Michelson locked
on a dark fringe, the f2-f1 signal at ~44
 IMG_3397.JPGphaseNoisePSD.pdfmagnitudeHist.pdfLOpowerDrift.png 
  15567   Thu Sep 10 15:43:22 2020 JonUpdateBHDInput noise spectra for A+ BHD modelingAs promised some time ago, I've
obtained input noise spectra from the sites calibrated
to physical units. They are located in a
  
  15569   Mon Sep 14 07:50:01 2020 YehonathanUpdateBHDMonte Carlo SimulationsTurns out what was causing the instability
in the aLIGO plots were the lock
commands which I forgot to remove before
 10x 
  15575   Tue Sep 15 22:11:52 2020 gautamUpdateBHDMore notes on the RF44 schemeSummary:

After more trials, I
 RF44.pdf 
  15579   Fri Sep 18 10:47:48 2020 gautamUpdateBHDSensing scheme for homodyne phaseeSummary:

I
 fieldQuads.pdfPMAMratio.pdf 
  15596   Tue Sep 22 22:38:11 2020 gautamUpdateBHDSensing scheme for homodyne phase - some analytic calcsI got some feedback from Koji who pointed
out that the phase tracker is not required
here. This situation is similar to the phase
 simpleMich.pdf.zip 
  15611   Mon Oct 5 00:37:19 2020 gautamUpdateBHDSingle bounce interferometer lockedSummary:

The simple interferometer, composed
of a single bounce reflection from ITMY and
 simpleHomodyne.pngsingleBounceIFO.pdfproposedController.pdffreeRunningSuppressed.pdf 
  15612   Mon Oct 5 00:53:16 2020 KojiUpdateBHDSingle bounce interferometer locked🤘🤘🤘

 
  
  15623   Tue Oct 13 11:13:54 2020 gautamUpdateBHDInvestigation into RF44 sensingAttachment
#1: spectra of the
 phaseNoisePSD.pdfloopTF.pdf 
  15628   Thu Oct 15 10:42:39 2020 gautamUpdateBHDMore investigation into RF44 sensingSummary of discussion between
Koji and gautam on 14 Oct:


Koji questioned the accuracy
 analogZetaLock.pngrelPhaseNoise.pdfsigMagPhase.pdf 
  15631   Fri Oct 16 09:16:37 2020 YehonathanUpdateBHDMonte Carlo SimulationsPushed another update to MCMC simulation.
This includes:


Added new imbalances: ITM
 8x 
  15637   Thu Oct 22 11:48:08 2020 YehonathanUpdateBHDMonte Carlo SimulationsI found this H1 alog  entry
by Izumi confirming that the calibrated channels
CAL-CS_* need the same dewhitening filter.
 8x 
  15684   Mon Nov 23 12:25:14 2020 gautamUpdateBHDBHD MMT Optics deliveredOptics --> Cabinet at south end (Attachment #1)  IMG_8965.HEIC 
  15685   Mon Nov 23 14:52:10 2020 KojiUpdateBHDBHD MMT Optics deliveredBasically, they repeated our specs and
showed the coating performances for HR/AR
for 10deg P and PR/AR for 45deg P. There
  
  15727   Thu Dec 10 14:48:00 2020 YehonathanUpdateBHDMonte Carlo SimulationsI have rebuilt the MCMC simulation in an
OOP fashion and incorporated Lance/Pytickle
functionality into it. The usage of the MCMC
 MCMCLance_NoiseBudget_Example.pdfIFO_Check.pdf 
  15732   Fri Dec 11 09:28:52 2020 ranaUpdateBHDMonte Carlo loop coupling SimulationsCool. Can you give us Bode plots of the
open loop gain for each of the 5 length control
loops?
  
  15734   Mon Dec 14 11:09:28 2020 YehonathanUpdateBHDMonte Carlo loop coupling SimulationsI spent a few hours monkeying around with
the control filters. They are totally made
up and also it's my first time trying
 MCMC_LANCE_OLTFs.pdfMCMC_LANCE_OLCoupling2DARM.pdf 
  15758   Mon Jan 11 16:11:51 2021 YehonathanUpdateBHDMonte Carlo loop coupling SimulationsI dived into the alog to make the OLTFs
in the MC_controls example more realistic.
I was mainly inspired by these entries:
 MC_LANCE_OLTFs.pdf 
  15759   Mon Jan 11 19:10:10 2021 ranaUpdateBHDMonte Carlo loop coupling Simulations
looking better, but the CARM plot
still looks weird.
you should
plot from 0.01 - 10,000 Hz
All
  
  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 
  15788   Tue Feb 2 17:09:17 2021 yehonathanUpdateBHDSOS assemblyI set up a working area on the table next
to the south flow bench (see attachment).
I also brought in a rolling table for some
 20210202_165501.jpg20210202_162452.jpg 
  15790   Tue Feb 2 18:24:54 2021 KojiUpdateBHDSOS assemblyYou can remove the components of the optical
table enclosure (black ones) and use the
optical table as your working area too.
  
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