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  40m Log, Page 29 of 344  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  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
  
  16619   Mon Jan 24 20:48:48 2022 AnchalUpdateBHDAS4 Input Matrix Diagonalization performed. I agree. That's an interesting idea.
But does that mean that there is an always
working inverse matrix solution or that any
  
  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
  
  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)
  
  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 
  16623   Tue Jan 25 16:42:03 2022 AnchalSummaryBHDReduced filter gains in all damped new SOSI noticed that our current suspension damping
loops for the new SOS were railing the DAC
outputs. The reason being that cts2um module
  
  16624   Tue Jan 25 18:37:12 2022 TYehonathanUpdateBHDPR2 SuspensionPR2's side magnet height was adjusted
and its roll was balanced (attachment 1,2).
I verified that the OpLev beam is still aligned.
 PR2_magnet_height.pngPR2_roll_balance.pngFreeSwingingSpectra_div_50mV.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
  
  16627   Thu Jan 27 17:57:35 2022 AnchalSummaryBHDPart III of BHR upgrade - Replaced small suspended PR3 with new SOS PR3 and OSEM tuning[Anchal, Paco]

We removed the old PR3 housed in
a tip-tilt style suspension and put it on
  
  16628   Thu Jan 27 18:03:36 2022 PacoSummaryBHDPart III of BHR upgrade - Install PR2, balance, and attempt OSEM tuning[Paco, Anchal, Tega]

After installing the short OSEMs
into PR2, we moved it into ITMX Chamber.
  
  16629   Thu Jan 27 20:46:38 2022 KojiSummaryBHDPart III of BHR upgrade - Install PR2, balance, and attempt OSEM tuning
Started debugging D1002818
/ S2100737
(8:30PM)
Confirmed the issue of
 Screen_Shot_2022-01-27_at_20.33.56.pngScreen_Shot_2022-01-27_at_21.30.16.png 
  16630   Fri Jan 28 10:37:59 2022 PacoSummaryBHDPart III of BHR upgrade - PR2 OSEM finalized, reinsall LO1 OSEMs[Paco]

Thanks to Koji's hotfix on
the PR2 SatAmp box last evening, this morning
  
  16631   Fri Jan 28 11:30:52 2022 KojiSummaryBHDPart III of BHR upgrade - PR2 OSEM finalized, reinsall LO1 OSEMsAll
green! Great work, Team!
  
  16632   Fri Jan 28 16:35:18 2022 AnchalSummaryBHDAS1, PR2 and PR3 set to trigger free swing testAS1, PR2 and PR3 are set to o go through
a free swinging test at 3 am. We have used
this script 
  
  16635   Tue Feb 1 15:33:28 2022 KojiSummaryBHDOptomechanics configuration for the in-vacuum aux small opticsI've summarized the optomechanics configuration
for the in-vacuum aux small optics

It's not obvious here but the
 Invac_opto_mechanics_v2.pdf 
  16636   Tue Feb 1 20:16:09 2022 TegaUpdateBHDPR2 candidate mirror analysisgit repo: git@git.ligo.org:tega-edo/charmirrormap.git

The analysis code takes in a set
of raw images, 10 in our case,  for
 PR2_M2_data.pngPR2_M2_recon_FoV_10mm.pngPR2_M2_residual_FoV_10mm.png 
  16637   Wed Feb 2 16:22:00 2022 AnchalSummaryBHDPart III of BHR upgrade - PR2 inpute matrix diagonalizedThe
free swinging test was successful. I
ran the input matrix diagonalization code
 PR2_FreeSwingData_PeakFitting_20220125.pdfPR2_SUS_InpMat_Diagnolization_20220202.pdf 
  16638   Wed Feb 2 16:27:57 2022 AnchalSummaryBHDPart III of BHR upgrade - PR3 inpute matrix diagonalizedThe
free swinging test was successful. I
ran the input matrix diagonalization code
 PR3_FreeSwingData_PeakFitting_20220125.pdfPR3_SUS_InpMat_Diagnolization_20220202.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 
  16640   Wed Feb 2 18:55:58 2022 KojiSummaryBHDOptomechanics configuration for the in-vacuum aux small opticsHere is more detail of the POP_SM4
mount assembly.

It's a combination of BA2V
 Screen_Shot_2022-02-02_at_6.46.46_PM.png 
  16641   Wed Feb 2 21:16:23 2022 KojiSummaryBHDOptomechanics configuration for the in-vacuum aux small opticsAsked Jordan to clean 2x 1.5" posts
(0.5 dia) and a washer with 1" dia.

 
 PXL_20220203_050156031.jpg 
  16678   Thu Feb 24 18:05:58 2022 YehonathanUpdateBHDRe-susspension of AS1{Yehonathan, Anchal, Paco}

Yesterday, Anchal and Paco removed
AS1 from the vacuum chamber and moved it
 signal-2022-02-24-173933_003.jpegsignal-2022-02-24-173933_002.jpeg 
  16694   Wed Mar 2 14:02:43 2022 YehonathanUpdateBHDRe-susspension of AS1Yesterday, I rebuilt the OpLev setup in
the cleanroom in order to suspend AS1. It
took me a while to find all the necessary
  
  16698   Thu Mar 3 17:09:46 2022 PacoUpdateBHDRe-susspension of AS1[Anchal, Paco]

Wire clamp spare was installed,
furthermore AS1 was reinstalled on adapter,
  
  16710   Mon Mar 7 16:56:08 2022 YehonathanUpdateBHDRe-susspension of AS1{Paco, Yehonathan}

We tried to roughly balance the
adapter with two counterweights at the front,
 signal-2022-03-07-171520_001.pngsignal-2022-03-07-172659_001.jpegsignal-2022-03-07-172659_003.jpeg 
  16711   Mon Mar 7 18:53:16 2022 KojiUpdateBHDRe-susspension of AS1Not sure if that small difference can cause
the alignment inability. Particularly, the
removed metal was just below the wire. This
  
  16714   Tue Mar 8 12:24:13 2022 YehonathanUpdateBHDRe-susspension of AS1The gluing seemed to be successful. I assembled
the side block with the magnet on the adapter.
Paco helped me hang the adapter on the SOS
 AS1_Roll_Balance.pngAS1_Height_Balance.pngFreeSwingingSpectra_new.pdf 
  16715   Tue Mar 8 19:29:36 2022 PacoUpdateBHDRe-balance of AS1[Paco]

Installed AS1 in vacuum, near the
center of the table, and installed the OSEMs.
  
  16716   Wed Mar 9 09:35:26 2022 PacoUpdateBHDRe-balance of AS1[Paco]

AS1 is installed, OSEMs balanced,
and the optic damped successfully. We should
  
  16718   Wed Mar 9 11:52:18 2022 YehonathanUpdateBHDSimplified BHD readout sketch on ITMY tableI have made an editable
draw.io diagram of the planned simplified
BHD setup on the ITMY table (see attached). 
 ITMY_Table_Sketch.drawio.pdf 
  16719   Wed Mar 9 12:57:52 2022 KojiUpdateBHDSimplified BHD readout sketch on ITMY table- BHD beams were already mixed in the chamber.
So we don't need a BS on the table. (Probably
there is no BS already)
  
  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
  
  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
  
  16732   Thu Mar 17 16:50:53 2022 PacoUpdateBHDXARM AUX alignment[Ian, Paco]

We opened the ITMX chamber and


Inspected PR2 and LO1 and
  
  16733   Thu Mar 17 17:23:22 2022 AnchalSummaryBHDPart IIa of BHR upgrade - Green laser alignment[Anchal, Yehonathan] (on Y Arm)

We first checked if the PZT mirrors
M1 and M2 can be controlled. They indeed
  
  16735   Fri Mar 18 17:15:19 2022 PacoUpdateBHDXARM AUX alignment cont.[Paco, Ian]

First, we re-balanced the ITMX
OSEMs so that they would damp at around half-a-shadow.
 Screen_Shot_2022-03-18_at_4.09.38_PM.png 
  16739   Mon Mar 21 18:00:05 2022 Ian MacMillanUpdateBHDXARM AUX alignment cont.[Ian, Paco]

Continuing with the previous alignment
that we stoped on friday, we re set up my
 PXL_20220322_015247138.jpg 
  16740   Mon Mar 21 18:24:07 2022 AnchalSummaryBHDPart IIa of BHR upgrade - Green laser alignment on Yarm[Anchal, Tega]

We did the following alignment
steps on Yarm today:
  
  16742   Thu Mar 24 19:20:28 2022 AnchalSummaryBHDPart IIa of BHR upgrade - Green laser alignment on Yarm[Anchal, Paco]


Uneloged: yesterday, Paco
and Ian tried locking the green laser on
  
  16744   Fri Mar 25 18:20:28 2022 AnchalSummaryBHDPart IIa of BHR upgrade - Green laser alignment on Yarm[Anchal, Paco, Shruti]


Today we found out that
the laser controller at the Yend had it's
  
  16745   Sat Mar 26 13:04:38 2022 PacoSummaryBHDPart IIa of BHR upgrade - Green laser alignment on YarmI came for a bit to check on the "1Y0
burning smell" reported by Koji last
evening. I agree that there's a toasty
  
  16749   Thu Mar 31 18:58:16 2022 Ian MacMillanSummaryBHDPart IIa of BHR upgrade - IR laser alignment on Xarm[Ian, Paco]

We continued to try and lock the
IR laser to the x-arm. Last time we adjusted
  
  16757   Tue Apr 5 18:15:06 2022 AnchalSummaryBHDPart IIa of BHR upgrade - IR laser alignment on Xarm[Paco, Anchal, Ian, JC]

We attempted the alignment of IR
beam into the arm cavities. We used PR2 and
  
  16758   Wed Apr 6 01:20:48 2022 KojiSummaryBHDPart IIa of BHR upgrade - IR laser alignment on XarmPR2/PR3 Output R for fame OSEMS reduced
from 1.2K to 1.2K//100Ohm

I
 PXL_20220406_060846581.jpgPXL_20220406_014205726.jpgPXL_20220406_060324812.jpgPXL_20220406_015259326.jpg 
  16759   Wed Apr 6 12:03:51 2022 AnchalSummaryBHDPart IIa of BHR upgrade - IR laser alignment on Yarm[Anchal, Paco]

After Koji reduced the output resistors
on PR2/PR3 coil drivers, we got much better
  
  16760   Wed Apr 6 22:51:47 2022 KojiSummaryBHDPart IIa of BHR upgrade - IR laser alignment on Xarm[Yuta Koji]

We took out the two coil driver
units for PR3 and the incorrect arrangement
 PXL_20220406_213356237.MP.jpgPXL_20220406_212936502.MP.jpg 
  16761   Thu Apr 7 11:47:22 2022 YehonathanUpdateBHDInitial BHD modeling: AS - LO mode matching

I begin modeling the initial BHD
  
  16762   Thu Apr 7 17:59:51 2022 AnchalSummaryBHDPart IIa of BHR upgrade - IR laser alignment on Yarm[Anchal, Paco, JC, Tega]

Today we have aligned the Yarm
cavity for IR, with verified 1.5 roundtrips.
  
  16766   Thu Apr 7 21:15:04 2022 YehonathanUpdateBHDInitial BHD modeling: AS - LO mode matchingOk, it turns out these optics were purchased
on purpose, as this elog
shows. Jon considered building a mode-matching
  
  16768   Fri Apr 8 17:21:31 2022 Ian MacMillanSummaryBHDPart IIa of BHR upgrade - IR laser alignment on Yarm[Ian, Paco, Tega]

Paco and I opened the ETMY and
ITMY chamber to work on yesterdays efforts
  
ELOG V3.1.3-