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ID Date Author Type Category Subjectup Text Attachments
  10059   Wed Jun 18 16:44:55 2014 ManasaUpdateElectronicsBBPD installed for BEATX detectionThis BBPD is the spare that we pulled out
and is installed for ALSX-PSL beat note detection.
  
  17152   Thu Sep 22 19:51:58 2022 AnchalUpdateBHDBH55 LSC Model Updates - part III updated follwoing in teh rtcds models
and medm screens:


c1lsc

Added
  
  17157   Fri Sep 23 19:04:12 2022 AnchalUpdateBHDBH55 LSC Model Updates - part IIIBH55

I further
updated LSC model today with following changes:


BH55 whitening switch binary
  
  17165   Thu Sep 29 18:01:14 2022 AnchalUpdateBHDBH55 LSC Model Updates - part IVMore model changes

c1lsc:


BH55_I and BH55_Q are now
being read at ADC_0_14 and ADC_0_15. The
  
  17150   Wed Sep 21 17:01:59 2022 PacoUpdateBHDBH55 RFPD installed - part I[Radhika, Paco]

Optical path setup

We
realized the DCPD - B beam path was already
 IMG_3760.jpegIMG_3764.jpeg 
  17155   Fri Sep 23 14:10:19 2022 RadhikaUpdateBHDBH55 RFPD installed - part I[Radhika, Paco, Anchal]

I placed a lens in the B-beam
path to focus the beam spot onto the RFPD
 IMG_3766.jpegIMG_3770.jpegIMG_3773.jpeg 
  17156   Fri Sep 23 18:31:46 2022 ranaUpdateBHDBH55 RFPD installed - part IA design flaw in these initial LIGO RFPDs
is that the SMA connector is not strain releieved
by mounting to the case. Since it is only
  
  17159   Mon Sep 26 11:39:37 2022 PacoUpdateBHDBH55 RFPD installed - part II[Paco, Anchal]

We followed rana's suggestion
for stress relief on the SMA joint in the
 PXL_20220926_175010061.MOTION.jpgBH55_Transimpedance_Measurement.pdf 
  15524   Fri Aug 14 00:01:55 2020 gautamUpdateCDSBHD / OMC model channels now added to autoburtI added the EPCIS channels for the c1omc
model (gains, matrix elements etc) to the
autoburt such that we have a record of these,
  
  16954   Tue Jun 28 14:24:23 2022 yutaUpdateBHDBHD DC PD signals now also sent to c1lsc to circumvent IPC error[JC, Yuta]

To circumvent IPC error sending
BHD DC PD signals from c1sus2 to c1lsc, DB9
 C1LSC.JPGC1SUS2.JPGScreenshot_2022-06-28_16-03-16_BHDDCPDcopied.png 
  16932   Tue Jun 21 14:17:50 2022 yutaConfigurationBHDBHD DCPDs re-routed to c1sus2After discussing with Anchal, we decided
to route BHD related PD signals directly
to ADC of c1sus2, which handles our new suspensions
 C1X07ADC1.JPGBHDDCPDs.JPG 
  17034   Mon Jul 25 18:09:41 2022 TegaConfigurationBHDBHD Homodyne Phase control MEDM screen[Paco, Tega, Yuta]

Today, we made a custom MEDM screen
for the BHD Homodyne Phase Control, which
 Screen_Shot_2022-07-25_at_6.12.08_PM.pngScreen_Shot_2022-07-25_at_6.18.09_PM.png 
  17024   Wed Jul 20 18:07:52 2022 PacoUpdateBHDBHD MICH test[Paco, Yuta, JC]

We did some easy tests on the BHD
readout in preparation for BHD MICH. With
 BHD_MICH_OSC.pdf 
  17037   Tue Jul 26 20:54:08 2022 PacoUpdateBHDBHD MICH test - LO phase control[Yuta, Paco]


TL;DR
Successfully
 20220726_BICHD.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 
  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
  
  16198   Fri Jun 11 20:19:50 2021 KojiSummaryBHDBHD OMC invacuum wiringStephen and I discussed the in-vacuum OMC
wiring.

- One of the OMCs has already been
 40mBHD_OMC_wiring.pdf 
  16318   Thu Sep 9 09:54:41 2021 StephenSummaryBHDBHD OMC invacuum wiring - cable lengths[Koji, Stephen - updated 30 September]

Cable lengths task - in vacuum
cabling for the green section (new, custom
 bhd_cable_length_check_cable_bracket_to_components.pngbhd_cable_length_check_flange_to_cable_bracket.pngbhd_cable_length_check_cable_bracket_to_omc_bracket.png 
  16839   Mon May 9 22:19:06 2022 KojiUpdateBHDBHD Platform Progress status[Don, Koji]

Don is working on finalizing the
BHD Platform design. All the components on
 Screenshot_2022-05-09_220220.pngScreenshot_2022-05-09_222405.png 
  16840   Mon May 9 23:18:44 2022 KojiUpdateBHDBHD Platform Progress statusI quickly ran the FEA model to check the
resonant freqs of the BHD platform.
The boundary conditions were:
 6x 
  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 
  16785   Mon Apr 18 16:09:07 2022 YehonathanUpdateBHDBHD Readout simulationI'm planning on simulating the BHD
readout noise in a manner very similar to
the ALS noise model using Simulink. I've
 BHD_Simulink_Sketch.drawio.pdf 
  16828   Tue May 3 21:07:17 2022 YehonathanUpdateBHDBHD Readout simulationI feel like there is an instability in
my thought process on this. Before my tendency
to try to scale and generalize this problem
  
  16834   Thu May 5 17:50:48 2022 YehonathanUpdateBHDBHD Readout simulationI have made a Simulink diagram to use in
the MICH modeling (attachment) for the homodyne
angle detection scheme. The model will be
 BHD_controls_40m_MICH.pdf 
  16815   Wed Apr 27 16:28:57 2022 AnchalSummaryBHDBHD Upgrade - Retreiving arm cavity alignment[Anchal, Paco, JC]

We had to open ITMY, ETMY chamber
doors to get the cavity aligned again. Once
  
  15540   Wed Aug 26 00:52:55 2020 gautamUpdateBHDBHD activitiesListing some talking points from the last
week of activity here.


  
  16880   Fri May 27 17:45:53 2022 yutaConfigurationBHDBHD camera installed, GRY aligned[JC, Paco, Yuta]

After the IFO recovery (elog 40m/16881),
  
  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
  
  17056   Wed Aug 3 16:00:51 2022 yutaUpdateBHDBHD fringe aligned with reduced LO and AS beam clippingLast week, we could find an alignment which
realizes LO beam and AS beam both unclipped,
but it was not consistent with an alignment
 Screenshot_2022-08-03_15-46-36_BHDfringeAlmostUnclipped.png 
  17067   Tue Aug 9 15:33:12 2022 yutaUpdateBHDBHD fringe contrast improved from 43% to 74%[Anchal, Yehonathan, Yuta]

We did the constrast measurement with
 HPC-DCPD_B_OUT_1344118517_ITMY-LO.pngHPC-DCPD_A_OUT_1344118517_ITMY-LO.pngHPC-DCPD_B_OUT_1344118318_ITMX-LO.pngHPC-DCPD_A_OUT_1344118318_ITMX-LO.png 
  17068   Tue Aug 9 15:50:22 2022 KojiUpdateBHDBHD fringe contrast improved from 43% to 74%For both 40m/17020
and 40m/17024,
what does the contrast mean if the numbers
  
  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:


  
  16475   Thu Nov 18 14:29:01 2021 KojiSummaryBHDBHD invac optics / opto-mechanicsI   
  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 
  15151   Fri Jan 24 13:56:21 2020 JonUpdateBHDBHD optics specificationsI've started a spreadsheet for the
BHD optics specifications and populated it
with my best initial guesses. There are a
  
  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 
  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 
  16849   Thu May 12 20:11:18 2022 AnchalUpdateBHDBHDBS Output beams steered out to ITMY tableI successfully steered out the two output
beams from BHD BS to ITMY table today. This
required significant changes on the table,
 signal-2022-05-12-201844.jpeg 
  16188   Sun Jun 6 16:33:47 2021 JonUpdateCDSBI channels on c1auxey



There
  
  16189   Mon Jun 7 13:14:20 2021 YehonathanUpdateCDSBI channels on c1auxeyI added a new XT1111 Acromag module to
the c1auxey chassis. I sanitized and configured
it according to the slow
  
  16193   Tue Jun 8 11:54:39 2021 YehonathanUpdateCDSBI channels on c1auxeyI tested the digital inputs the following
way: I connected a DB9 breakout to DB9M-5
and DB9M-6 where digital inputs are hosted.
  
  15248   Wed Mar 4 12:25:11 2020 gautamUpdateCDSBIO1 on c1psl is deadThere was some work done on the Acro crate
this morning. Unclear if this is independent,
but I found that the IMC servo board IN1
  
  5567   Wed Sep 28 18:39:50 2011 MirkoUpdatePEMBLRM seismic channels in c1pem[Mirko,Jenne]
Created 5-band BLRMS for seismometer
data (Gur1, Gur2 and STS1 each in x,y,z respectively)
  
  6523   Wed Apr 11 22:48:39 2012 ranaUpdateEnvironmentBLRMS   seis_blrms.png 
  7183   Tue Aug 14 21:01:51 2012 ranaUpdatePEMBLRMS   Screenshot-Untitled_Window.png 
  8764   Thu Jun 27 15:50:03 2013 JenneUpdatePEMBLRMS are going crazyThe BLRMS are totally crazy today! 
I'm not sure what the story is, since it's
been this way all day (so it's not an earthquake,
 WeirdBLRMSincrease_27June2013_rawSeis.pngWeirdBLRMSincrease_27June2013_lowFreqBLRMS.pngWeirdBLRMSincrease_27June2013_Gur1xBLRMS.png 
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