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ID Date Author Type Categoryup Subject Text Attachments
  15228   Wed Feb 26 22:09:52 2020 gautamSummaryBHDProjected IFO noise budget, post-BHD upgradeThe quantum noise curves here are not correct.
c.f. amplitude quadrature noise
budget.
  
  15241   Mon Mar 2 23:49:03 2020 JonSummaryBHDProjected IFO noise budget, post-BHD upgradeUpdated noise budget curves, now computed
using the latest version of pygwinc. This
resolves the inconsistency between the gwinc
 40m_phase_quad.pdf40m_ampl_quad.pdf40m_aligo_comp.pdf 
  15244   Tue Mar 3 18:11:05 2020 JonSummaryBHDProjected IFO noise budget, post-BHD upgradeRevised noise estimates, correcting a couple
of factor of 2 and factor of pi errors found
in the coil driver noise calculation. Also
 40m_phase_quad.pdf40m_ampl_quad.pdf40m_aligo_comp.pdf 
  15267   Wed Mar 11 21:03:57 2020 KojiUpdateBHDSOS packages from SyracuseI opened the packages send from Syracuse.

- The components are not vacuum
clean. We need C&B.
 P_20200311_203449_vHDR_On.jpg 
  15284   Thu Mar 26 17:41:18 2020 JonOmnistructureBHDBHD docs compilationSince there has been a proliferation of
BHD Google docs recently, I've linked
them all from the BHD
  
  15295   Fri Apr 3 13:40:07 2020 JonUpdateBHDBHD front-end complicationI wanted to pass along a complication pointed
out by K. Thorne re: our plan to use Gen1
(old) Dolphin IPC cards in the new real-time
  
  15299   Tue Apr 7 10:56:39 2020 JonUpdateBHDBHD front-end complication


Quote:


  
  15305   Thu Apr 16 21:13:20 2020 JonUpdateBHDBHD optics specificationsSummary

I've generated
specifications for the new BHD optics. This
includes the suspended relay mirrors as
 LO_Beam_Calc-v1.pdfAS_Beam_Calc-v1.pdf 
  15322   Fri May 8 14:27:25 2020 HangUpdateBHDNew SRC gouy phase[Jon, Hang]

After updating the 40 m finesse
file to incorporate the new SRC length (and
 mode_spec_finesse.pdfmode_spec_ideal.pdf 
  15334   Fri May 15 09:18:04 2020 JonUpdateBHDBHD telescope designs accounting for ASCHang and I have reanalyzed the BHD telescope
designs, with the goal of identifying
sufficiently non-degenerate locations for
 LOpath.pdfASpath.pdf 
  15336   Mon May 18 18:00:16 2020 HangUpdateBHDBHD mode-matching study[Jon, Tega, Hang]

We proposed a few BHD mode-matching telescope
designs and then preformed a few monte-carlo
 MM.pdf 
  15337   Tue May 19 15:24:06 2020 ranaUpdateBHDBHD mode-matching studyIt would be good to have a corner
plot with all the distances/ RoCs. Also
perhaps a Jacobian
  
  15339   Wed May 20 18:45:22 2020 HangUpdateBHDBHD mode-matching study--corner plot & adjustment requirementAs Rana suggested, we present the
scattering plot of the AS path
mode matching for various variables.
 AS_MM_scat2.pdfAS_MM_adj2.pdf 
  15357   Tue May 26 19:19:30 2020 HangUpdateBHDBHD MM-- effects of astigmatismPlease see the attached doc. 

I think the conclusion is that
if the AS1 RoC error is not significantly
 MM.pdf 
  15363   Tue Jun 2 14:05:24 2020 HangUpdateBHDMM telescope actuation range requirmentsWe computed the required actuation range
for the telescope design in elog:15357. The result
 TM_OL_spec_1274418500_512.pdfCORNER_OL_spec_1274418500_512.pdf 
  15379   Sat Jun 6 14:07:30 2020 JonUpdateBHDStock-Part Mode-Matching Telescope OptionSummary

For the initial phase of
BHD testing, we recently discussed whether
the mode-matching telescopes could be built
 ASpathStock.pdfLOpathStock.pdf 
  15380   Mon Jun 8 11:50:02 2020 HangUpdateBHDAstigmatism and scattering plotsWe consider the astigmatism effects of
the stock options. The conclusions are:

1. For the AS path, the stock should work
 6x 
  15381   Mon Jun 8 12:49:07 2020 KojiUpdateBHDAstigmatism and scattering plotsCan you describe the mode matching 
in terms of the total MM? Is MM_total = sqrt(MM_vert
* MM_horiz)?
  
  15382   Mon Jun 8 17:40:22 2020 JonUpdateBHDAstigmatism and scattering plotsMM_total = (MM_vert + MM_horiz) / 2. 

The large astigmatic MM loss in
the LO case is mainly due to the strong LO4
 LOpathStock2.pdf 
  15384   Mon Jun 8 21:45:47 2020 JonUpdateBHDAstigmatism and scattering plotsHmm? T1300364
suggests MM_total = Sqrt(MM_Vert * MM_Horiz)
  
  15386   Tue Jun 9 14:55:43 2020 JonUpdateBHDMM telescope actuation range requirmentsI don't think we ever discussed why
the angular RMS of the ETMs is so much higher
than the ITMs. Maybe that's a separate
  
  15387   Tue Jun 9 15:02:56 2020 eHangUpdateBHDAstigmatism and scattering plotsUsing the updated AOI's for the LO
path: (4.8, 47.9, 2.9, 4.5) deg for (LO1,
LO2, LO3, LO4), we obtain the following results. 
 LO_MM_t_scat_stock.pdfLO_MM_s_scat_stock.pdfLO_MM_adj_stock.pdf 
  15389   Thu Jun 11 09:37:38 2020 JonUpdateBHDConclusions on Mode-Matching TelescopesAfter further astigmatism/tolerance analysis
[ELOG
15380, 15387]
  
  15456   Mon Jul 6 15:10:40 2020 JonSummaryBHD40m --> A+ BHD design analysisAs suggested last week, Hang and I have
reviewed the A+ BHD status
(DRD, CDD, and reviewers' comments) and
  
  15464   Thu Jul 9 17:12:52 2020 gautamUpdateBHDIn-air BHDSummary:

We can probably learn something
about the interferometer / top level BHD
 OMCchamber.pdfAP_Table_20180328.pdf 
  15479   Tue Jul 14 15:29:25 2020 gautamUpdateBHDIn-air BHD - DCPD amplifier noiseFor the first pass, it's probably easiest
to use the existing DCPD
amplifier. Looking at the gain and noise
 DCPDamp.pdf 
  15483   Wed Jul 15 19:11:40 2020 gautamUpdateBHDIn-air BHD - alignment into OMCI forgot about the pointing - probably
we will need another actuator to control
the pointing of the AS beam onto the DCPDs.
  
  Draft   Wed Jul 15 19:17:09 2020 gautamUpdateBHDIn-air BHD - alignment into OMCYou can activate all 3axis

 
  
  15489   Thu Jul 16 01:12:22 2020 gautamUpdateBHDIn-air BHD - preparing the LO pathAttachment
#1 - The 80mW pickoff
 IMG_8626.JPGIMG_8627.JPGIMG_8628.JPGIMG_8629.JPG 
  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
  
ELOG V3.1.3-