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ID Date Author Type Category Subjectup Text Attachments
  16771   Mon Apr 11 21:44:14 2022 KojiSummaryBHDPart IIa of BHR upgrade - POY11 debuggingWe took out the right most PD interface
board D990543 and removed the 74LS04 chips.
In fact two out of 4 were already replaced
 D990543A1.PDFPXL_20220412_023941730.jpgPXL_20220412_023950567.jpg 
  16779   Thu Apr 14 11:52:57 2022 yehonathanSummaryBHDPart IIa of BHR upgrade - POY11 debugging{JC, Paco, Yehonathan, Ian}

POY lens was moved to infront of
the POY steering mirror to make the POU beam
 Screenshot_2022-04-14_15-53-39.pngPXL_20220414_220616875.jpg 
  16781   Thu Apr 14 18:39:13 2022 PacoSummaryBHDPart IIa of BHR upgrade - POY11 debugging[Paco]

In reply to Koji's questions;

Q1: What is the product number
  
  16786   Mon Apr 18 17:53:45 2022 PacoSummaryBHDPart IIa of BHR upgrade - POY11 debugging[Paco, Ian]

We aligned the X-arm IR laser


First fix pointing on the
  
  16437   Thu Oct 28 16:32:32 2021 PacoSummaryBHDPart IV of BHR upgrade - Removal of BSC eastern optics[Ian, Paco, Anchal]

We turned off the BSC oplev laser
by turning the key counterclockwise. Ian
  
  16592   Tue Jan 18 15:19:49 2022 PacoSummaryBHDPart IV of BHR upgrade - Replaced old SR3 with SOS SR2. OSEM tuning attemtped.[Tega, Anchal, Paco]

We started working on SR2 installation.
Preliminary work involved
 PXL_20220119_012954365.jpgPXL_20220119_013003522.jpg 
  16605   Thu Jan 20 17:03:36 2022 AnchalSummaryBHDPart IV of BHR upgrade - SR2 OSEM tuned.The main issue with SR2 OSEMs, now that
I think of it, was that the BS table was
very inclined due to the multiple things
 DJI_0144.JPG 
  16595   Wed Jan 19 12:50:10 2022 AnchalSummaryBHDPart IV of BHR upgrade - SR2 OSEM tuning progress.It was indeed the issue of the top OSEM
plate not being in the right place horizontally.
But the issue was more non-trivial. I believe
  
  16593   Tue Jan 18 18:16:28 2022 AnchalSummaryBHDPart IV of BHR upgrade - SR2 Sat Amp Box inspectionI tested the monitor ports on the SR2
Sat Amp Box but found that all LED Mon
and PD Mon are giving expected values. I
  
  16622   Tue Jan 25 11:02:54 2022 AnchalSummaryBHDPart IX of BHR upgrade - AS1 free swing test failedFor some reasonf the free swing test showed
only one resonance peak (see attachment 1).
This probably happened because one of the
 AS1_freeSwingTestFailed.pdf 
  16639   Wed Feb 2 16:32:02 2022 AnchalSummaryBHDPart IX of BHR upgrade - AS1 free swing test still not goodWe still did not get a good AS1 free swinging
spectrum. It seems the Side OSEM is reporting
coupling to too many DOFs and some extra
 AS1_FreeSwingData_PeakFitting_20220125.pdfAS1_SUS_InpMat_Diagnolization_20220202.pdf 
  16625   Thu Jan 27 08:27:34 2022 PacoSummaryBHDPart IX of BHR upgrade - AS1 inspection and correction[Paco]

This morning, I went into ITMY
chamber to inspect AS1 after the free swinging
  
  16620   Mon Jan 24 21:18:40 2022 PacoSummaryBHDPart IX of BHR upgrade - AS1 placed and OSEM tuned[Paco]

AS1 was installed in the ITMY chamber
today. For this I moved AS4 to its nominal
  
  16729   Tue Mar 15 18:42:37 2022 AnchalSummaryBHDPart IX of BHR upgrade - AS1 resuspended and OSEMs tunedhttp://nodus.ligo.caltech.edu:8080/40m/16722

http://nodus.ligo.caltech.edu:8080/40m/16716
  
  16545   Thu Jan 6 11:54:20 2022 AnchalSummaryBHDPart IX of BHR upgrade - Placed AS1 and AS4[Paco (Vacuum Work), Anchal]

Today we opened the ITMY Chamber
and installed suspended AS1 and AS4 in their
  
  16554   Fri Jan 7 16:17:42 2022 AnchalSummaryBHDPart IX of BHR upgrade - Placed AS1 and AS4 filters[paco]

Added input filters, input matrix,
damping filters, output matrix, coil filters,
  
  16559   Sat Jan 8 16:01:42 2022 PacoSummaryBHDPart IX of BHR upgrade - Placed LO2 filtersAdded input filters, input matrix, damping
filters, output matrix, coil filters, and
copy the state over from ITMX into LO2
  
  16591   Tue Jan 18 14:26:09 2022 PacoSummaryBHDPart IX of BHR upgrade - Placed remaining filters SR2, PR3, PR2[Anchal, Paco]

Added input filters, input matrix,
damping filters, output matrix, coil filters,
  
  16800   Thu Apr 21 18:42:47 2022 TegaUpdateBHDPart V of BHR upgrade - Align LO and AS beams to BHD BS[Tega, Yuta, Paco]

We tried aligning the LO and AS
beams on to the BHD beamsplitter. During
  
  16797   Thu Apr 21 16:49:01 2022 PacoUpdateBHDPart V of BHR upgrade - BS Oplev + LO1 offset[Paco, JC, Yuta]

We aligned the BS oplev using the
new BSOL mirror pair. The main change is
  
  16788   Tue Apr 19 18:10:10 2022 PacoUpdateBHDPart V of BHR upgrade - POX11 path, LO path, and ITMX Oplev[Yuta, Paco]

We set up POX11 beam path from
ITMX chamber to the ITMX in-air table. To
 DJI_0167.JPGDJI_0169.JPGDJI_0168.JPG 
  16789   Wed Apr 20 08:20:22 2022 PacoUpdateBHDPart V of BHR upgrade - PR2 weirdnessYesterday, I tried tuning the PR2 damping
gains by increasing the gain until the damping
gave the ~5 oscillations (by watching the
  
  16792   Wed Apr 20 18:50:03 2022 KojiUpdateBHDPart V of BHR upgrade - PR2 weirdnessIt seemed that it comes from the servo
oscillation. This does not happen when the
output limitters were set to be 100-ish.
 Screenshot_2022-04-20_18-46-11.png 
  16450   Fri Nov 5 12:21:16 2021 AnchalSummaryBHDPart VI of BHR upgrade - Removal of ITMYC opticsToday I opened the ITMY chamber and removed
the following optics and placed them in Xend
flow bench (See attachment 1-3 for updated
 XendFlowBenchLeftEnd.jpgXendFlowBenchMiddle.jpgXendFlowBenchRightEnd.jpg 
  16552   Thu Jan 6 21:04:41 2022 AnchalSummaryBHDPart VIII of BHR upgrade - LO1 OSEMs inserted[Anchal, Koji] Part of elog:
40m/16549.

The magnets on the mirror face
  
  16621   Tue Jan 25 10:55:02 2022 AnchalSummaryBHDPart VIII of BHR upgrade - LO2 input matrix diagonalization performed.The free swinging test was successful.
I ran the input matrix diagonalization code
(/opt/rtcds/caltech/c1/Git/40m/scripts/SUS/InMAtCalc/sus_diagonalization.py)
  
  16618   Mon Jan 24 18:53:09 2022 AnchalSummaryBHDPart VIII of BHR upgrade - LO2 placed and OSEMs tunedI placed LO2 in its planned position in
BS chamber, inserted the OSEMs, and tuned
their position to halfway brightness. At
  
  16509   Wed Dec 15 16:11:38 2021 AnchalSummaryBHDPart VIII of BHR upgrade - Placed LO1[Anchal, Yehonathan, Paco]


Today we opened ITMX chamber
and removed the following optics and placed
 signal-2021-12-15-161437.jpeg 
  16510   Wed Dec 15 17:44:18 2021 KojiSummaryBHDPart VIII of BHR upgrade - Placed LO1If ITMX already has another side magnet,
we can migrate the side OSEM of ITMX to the
other side. This way, the interference of
  
  16730   Tue Mar 15 18:45:12 2022 AnchalSummaryBHDPart X of BHR upgrade - BHDBS Path setup[Paco, Anchal]

BS Chamber work


ASL
was positioned in nominal place.
PR3
  
  15075   Thu Dec 5 01:54:39 2019 gautamUpdateLSCPartial CM board path engaged
The arm powers could be stabilized
somewhat once the CM_SLOW path to MC2 was
engaged.
However, I was never
 AOengaged.pdf 
  12672   Wed Dec 7 11:52:48 2016 ericqUpdateIMCPartial IMC ringdownsThe transients are likely due to doppler
interference due to the input laser frequency
sloshing due to errant control signals after
 IMCpartial.pngIMCpartial.zip 
  12675   Thu Dec 8 19:01:21 2016 ranaUpdateIMCPartial IMC ringdownsMach Zucker on howto do Ringdowns:  https://dcc.ligo.org/LIGO-T900007   
  949   Tue Sep 16 10:57:45 2008 YoichiConfigurationPEMParticle counter gainSummary:
Since we reduced the integration time of
the particle counter by a factor of 10, we
  
  16416   Wed Oct 20 11:16:21 2021 AnchalSummaryPEMParticle counter setup near BS ChamberI have placed a GT321 particle counter
on top of the MC1/MC3 chamber next to the
BS chamber. The serial cable is connected
 PXL_20211020_183728734.jpg 
  16420   Thu Oct 21 11:41:31 2021 AnchalSummaryPEMParticle counter setup near BS ChamberThe particle count channel names were changes
yesterday to follow naming conventions used
at the sites. Following are the new names:
 ParticleCountData20211021.pdf 
  16421   Thu Oct 21 15:22:35 2021 ranaSummaryPEMParticle counter setup near BS ChamberSVG doesn't work in my browser(s).
Can we use PDF as our standard for all graphics
other than photos (PNG/JPG) ?
  
  16422   Thu Oct 21 15:24:35 2021 ranaSummaryPEMParticle counter setup near BS Chamberrethinking what I said on Wednesday - its
not a good idea
to put the particle counter on a vac chamber
  
  16423   Fri Oct 22 17:35:08 2021 Ian MacMillanSummaryPEMParticle counter setup near BS ChamberI have done some reading about where would
be the best place to put the particle counter.
The ISO standard (14644-1:2015) for
  
  16750   Fri Apr 1 14:26:19 2022 Ian MacMillanSummaryPEMParticle counter setup near BS ChamberI mounted the particle counter over the
BS chamber attached to the cable tray as
seen in Attachment 1. The signal cable runs
 IMG_1407.jpg 
  16754   Sat Apr 2 15:46:13 2022 ranaSummaryPEMParticle counter setup near BS Chambernice - please update the particle counter
page in the 40m wiki. Its probably years
out of date.
  
  5140   Mon Aug 8 14:21:03 2011 steveUpdatePEMParticle counts controlled

    

       
            
 P1080149.JPGP1080150.JPG 
  1209   Wed Dec 31 22:59:40 2008 YoichiSummaryEnvironmentParticle counts going crazyYes it is a new year's eve, and a lot of crazy
people are on Colorado to secure seats for
the parade tomorrow.
  
  1211   Thu Jan 1 01:07:03 2009 YoichiSummaryEnvironmentParticle counts going crazyI increased the fan speed of the PSL HEPA
filter to the maximum.
  
  5134   Sun Aug 7 14:11:53 2011 JenneUpdatePEMParticle counts through the roof[Jenne, Kiwamu]
While Kiwamu was finalizing the X
green alignment, I started to prepare to
 ParticleCount_High_7Aug2011.png 
  13783   Tue Apr 24 10:10:43 2018 gautamUpdateComputer Scripts / ProgramsParticle swarm hyper parameter optimizationI'm copying and pasting Nikhil's
email here as he was unable to login to the
elog (but should now be able to in order
 ClusterFminScaled.pngClusterID_5.png 
  14153   Fri Aug 10 11:29:39 2018 aaronConfigurationUpgradeParts list for BHDI've started putting together a list
of things we'll need to buy to do BHD
readout. I'm still messing around with
  
  14154   Fri Aug 10 16:43:50 2018 gautamConfigurationUpgradeParts list for BHDCan we use the leakage
beam from MMT2 on the OMC table as the
LO beam? I can't find the spec for this
  
  14155   Sun Aug 12 10:59:34 2018 aaronConfigurationUpgradeParts list for BHDThat seems fine, I wasn't thinking
of that beam. in that case could we just
have a PBS directly behind MMT2 and send
  
  14158   Mon Aug 13 17:20:07 2018 aaronConfigurationUpgradeParts list for BHDI've attached the diagram of what I
mean.

There are a couple caveats and
 BHD_layout.pdf 
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