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ID Date Author Type Categoryup Subject Text Attachments
  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
  
  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,
  
  16555   Fri Jan 7 17:54:13 2022 AnchalUpdateBHDPR2 Sat Amp has a bad channel[Anchal, Paco]

Yesterday we noticed that one of
the ADC channels was overflowing. I checked
 Screen_Shot_2022-01-07_at_6.05.39_PM.png 
  16556   Fri Jan 7 17:59:45 2022 YehonathanUpdateBHDSOS assembly -- SR2{Yehonathan, Paco}

{Paco, Yehonathan}

Today we suspended SR2 (
 SR2_roll_balance.pngSR2_magnet_height.pngFreeSwingingSpectra.pdf 
  16557   Fri Jan 7 18:24:25 2022 KojiUpdateBHDSOS assembly -- SR2Vacseal in the freezer. It could have been
expired sooooo many years ago, We need some
cure testing.
  
  16558   Fri Jan 7 18:28:13 2022 KojiUpdateBHDPR2 Sat Amp has a bad channelLeave the unit to me. I can look it at
on Mon. For a while, you can take a replacement
unit from the electronics stack.
  
  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
  
  16560   Mon Jan 10 13:35:52 2022 AnchalUpdateBHDPR2 Sat Amp has a bad channelThe unit was tested before by Tege. The
test included testing the testpoint voltages
only. He summarized his work in
  
  16561   Mon Jan 10 14:00:44 2022 not KojiUpdateBHDSOS assembly -- SR2Yes,

For the thin optics adapter design,
we want Peek 1/4-20 screw (part # 98885A131)
  
  16562   Mon Jan 10 14:52:51 2022 AnchalSummaryBHDLO1 OSEMs roughly calibrated and noise measuredI used the open light level output of 908
for ITMX side OSEM from 40m/16549
to roughly calibrate cts2um filter module
 LO1_vs_ETMX_OSEM_Spectrum_LF_x30_Gain.pdfLO1_vs_ETMX_OSEM_Spectrum_HF_x30_Gain.pdf 
  16564   Mon Jan 10 15:59:46 2022 KojiUpdateBHDPR2 Sat Amp has a bad channelThe issue was present in the cable between
the small adapter board and the rear panel.
The cable and the Dsub 25 connectors were
 6x 
  16565   Mon Jan 10 17:04:47 2022 AnchalUpdateBHDAS1 Sat Amp CH2 had offsetWe found that there was a small offset
(~300 mV) at TP6 and TP8, in PD2 circuit
(CH2 of the board). I replaced U3 AD822ARZ
  
  16566   Mon Jan 10 18:20:45 2022 AnchalUpdateBHDTested 2" PR2 candidates transmissionI tested 2 more optics found by Paco and
Yehonathan in QIL.

  
  16567   Mon Jan 10 18:36:41 2022 AnchalSummaryBHDLO1 free swinging test set to triggerLO1 is set to go through a free swinging
test at 1 am tonight. We have used this script
(scripts/SUS/InMatCalc/freeSwing.py) reliably
  
  16568   Tue Jan 11 09:53:14 2022 not KojiUpdateBHDSOS assembly -- Peek screws and nutsI handed the Peek parts we got from McMaster
to Jordan for C&B.
  
  16572   Tue Jan 11 12:19:12 2022 AnchalSummaryBHDLO1 Input Matrix Diagonalization performed.The frree swinging test was successful.
I ran the input matrix diagonalization code
(scripts/SUS/InMAtCalc/sus_diagonalization.py)
 LO1_SUS_InpMat_Diagnolization.pdfLO1_FreeSwingData_PeakFitting.pdf 
  16575   Tue Jan 11 15:21:16 2022 AnchalUpdateBHDPR2 transmission calculationI did this simple calculation where I assumed
1W power from laser and 10% transmission
past IMC. We would go ahead with V6-704/V6-705
 LO_power_vs_PR2_transmission.pdfPRC_Gain_vs_PR2_transmission.pdfPRS_Trans_Calc.ipynb.zip 
  16577   Tue Jan 11 18:18:29 2022 AnchalSummaryBHDAttempted OSEM installation on AS1[Anchal, Paco, Yehonathan]

Connected in-cir cable to new flange
on ITMY Chamber
  
  16578   Tue Jan 11 18:40:25 2022 AnchalSummaryBHDAS1 Sat Amp has a PCB issueAS1
Sat Amp (S2100741) has a critical PCB
issue on it's Ch5-8 board S2100548. This
 signal-2022-01-11-184917.jpeg 
  16579   Thu Jan 13 09:48:41 2022 AnchalSummaryBHDAS1 Sat Amp fixedI fixed the issue in AS1
Sat Amp (S2100741) by using a razor blade.
I cut the short between the two places, cleaned
 signal-2022-01-13-094823_001.jpegsignal-2022-01-13-094823_002.jpeg 
  16580   Thu Jan 13 12:24:08 2022 AnchalSummaryBHDAS1 SD and LR magnets broke[Anchal (vacuum work), Paco (outside)]

After the AS1 Sat Amp fix (40m/16579),
we today were able to tune all OSEMs to the
  
  16581   Thu Jan 13 12:29:27 2022 AnchalSummaryBHDAS4 LR magnet brokeAfter the debacle with AS1 (40m/16580),
we decided the put the PEEK earthquake stop
by first removing the lower OSEM plate and
  
  16582   Thu Jan 13 16:08:00 2022 YehonathanUpdateBHDgluing magnets after AS1/4 misfortune{Yehonathan, Anchal, Paco}

In the cleanroom, we removed AS1
and AS4 from their SOS towers. We removed
  
  16583   Thu Jan 13 17:10:55 2022 AnchalUpdateBHDPR2 transmission calculationI corrected the calculation by adding losses
by the arm cavity ends times the arm cavity
finesse and also taking into account the
 LO_power_vs_PR2_transmission.pdfPRC_Gain_vs_PR2_transmission.pdfPR2_Trans_Calc.ipynb.zip 
  16584   Fri Jan 14 03:07:04 2022 KojiUpdateBHDPR2 transmission calculationI opened the notebook but I was not sure
where you have the loss per bounce for the
arm cavity.
  
  16585   Fri Jan 14 11:00:29 2022 AnchalUpdateBHDPR2 transmission calculationYeah, I counted the loss from arm cavities
as the transmission from ETMs on each bounce.
I assumed Michelson to be perfectly aligned
  
  16587   Fri Jan 14 13:46:25 2022 AnchalUpdateBHDPR2 transmission calculation updatedI updated the arm cavity roundtrip losses
due to scattering. Yehonathan told me that
arm cavity looses 50ppm every roundtrip other
 LO_power_vs_PR2_transmission.pdfPRC_Gain_vs_PR2_transmission.pdfPR2_Trans_Calc.ipynb.zip 
  16589   Fri Jan 14 17:33:10 2022 YehonathanUpdateBHDAS4 resurrection{Yehonathan, Anchal}

Came this morning, the gluing of
the magnets was 100% successful. Side blocks,
 AS4_roll_balance2.pngAS4_magnet_height2.pngFreeSwingingSpectra.pdf 
  16590   Fri Jan 14 18:12:47 2022 AnchalSummaryBHDAS4 placed in ITMY Chamber, OSEMs connectedAS4 was succesfully suspended and trasported
to ITMY chamber (40m/16589).
We placed it near the door to make it easy
  
  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,
  
  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 
  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
  
  16594   Tue Jan 18 18:19:22 2022 KojiSummaryBHDAS4 placed in ITMY Chamber, OSEMs connectedAS4 satellite amplifier D1002818
/ D080276 troubleshoot

I dug into the circuit to see what/where
 Screen_Shot_2022-01-18_at_17.48.16.pngcable_swap.png 
  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
  
  16596   Wed Jan 19 12:56:52 2022 PacoSummaryBHDAS4 OSEMs installation[Paco, Tega, Anchal]

Today, we started work on AS4 SOS
by checking the OSEM and cable. Swapping
  
  16597   Wed Jan 19 14:41:23 2022 KojiUpdateBHDSuspension StatusIs this the correct status? Please
directly update this entry.


  
  16598   Wed Jan 19 16:22:48 2022 AnchalUpdateBHDPR2 transmission calculation updatedI have further updated my calculation.
Please find the results in the attached pdf.

Following is the description of
 PR2transmissionSelectionAnalysis.pdfPR2_Trans_Calc.ipynb.zip 
  16599   Wed Jan 19 18:15:34 2022 YehonathanUpdateBHDAS1 resurrectionToday I suspended AS1. Anchal helped me
with the initial hanging of the optics. Attachments
1,2 show the roll balance and side magnet
 AS1_roll_balance2.pngAS1_magnet_heigh2.pngFreeSwingingSpectra.pdfIMG_6324.JPG 
  16602   Thu Jan 20 01:48:02 2022 KojiUpdateBHDPR2 transmission calculation updatedIMC is not such lossy. IMC output is supposed
to be ~1W.

The critical coupling condition
  
  16603   Thu Jan 20 12:10:51 2022 YehonathanUpdateBHDAS1 resurrectionI was wondering whether I should take AS1
down to redo the wire clamping on the side
blocks. I decided to take the OpLev spectrum
 FreeSwingingSpectra.pdfFreeSwingingSpectra_div_20mV.pdfFreeSwingingSpectra_div_50mV.pdf 
  16604   Thu Jan 20 16:42:55 2022 PacoUpdateBHDAS4 OSEMs installation - part 2[Paco]

Turns out, the shifting was likely
due to the table level. Because I didn't
  
  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 
  16607   Thu Jan 20 17:34:07 2022 KojiUpdateBHDV6-704/705 Mirror now @DownsThe PR2 candidate V6-704/705 mirrors (Qty2)
are now @Downs. Camille picked them up for
the measurements.
 PXL_20220120_225248265_2.jpgPXL_20220120_225309361_2.jpg 
  16608   Thu Jan 20 18:16:29 2022 AnchalUpdateBHDAS4 set to trigger free swing testAS4 is set to go through a free swinging
test at 10 pm tonight. We have used this
script (Git/40m/scripts/SUS/InMatCalc/
  
  16609   Thu Jan 20 18:41:55 2022 AnchalSummaryBHDSR2 set to trigger free swing testSR2 is set to go through a free swinging
test at 3 am tonight. We have used this script
(Git/40m/scripts/SUS/InMatCalc/freeSwing.py)
  
  16610   Fri Jan 21 11:24:42 2022 AnchalSummaryBHDSR2 Input Matrix Diagonalization performed. The free swinging test
was successful. I ran the input matrix diagonalization
code (
 SR2_SUS_InpMat_Diagnolization_20220121.pdfSR2_FreeSwingData_PeakFitting_20220121.pdf 
  16612   Fri Jan 21 14:51:00 2022 KojiUpdateBHDV6-704/705 Mirror now @DownsCamille@Downs measured the surface of these
M1 and M2 using Zygo.
 M1.PNGM1_30mm.PNGM2.PNGM2_30mm.PNG 
  16613   Fri Jan 21 16:40:10 2022 AnchalUpdateBHDAS4 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)
 AS4_SUS_InpMat_Diagnolization_20220121.pdfAS4_FreeSwingData_PeakFitting_20220121.pdf 
  16616   Mon Jan 24 17:12:27 2022 ranaUpdateBHDAS4 Input Matrix Diagonalization performed. I think our
suspension input matrix diagonalization is
not so robust usually because
  
  16617   Mon Jan 24 17:58:21 2022 YehonathanUpdateBHDPR2 SuspensionI picked up the PR2 mirrors (labeled M1,
M2) from Anchel's table and took them
to the cleanroom. By inspection, I spotted
  
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