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40m Log |
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Mon Oct 25 13:23:45 2021, Anchal, Summary, BHD, Before photos of BSC
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Mon Oct 25 17:37:42 2021, Anchal, Summary, BHD, Part I of BHR upgrade - Removed optics from BSC 
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Tue Oct 26 16:56:22 2021, Paco, Summary, BHD, Part I of BHR upgrade - Locked PMC and IMC
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Wed Oct 27 16:27:16 2021, Anchal, Summary, BHD, Part II of BHR upgrade - Prep 
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Wed Oct 27 16:31:35 2021, Anchal, Summary, BHD, Part III of BHR upgrade - Removal of PR2 Small Suspension
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Thu Oct 28 16:32:32 2021, Paco, Summary, BHD, Part IV of BHR upgrade - Removal of BSC eastern optics
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Fri Nov 5 12:21:16 2021, Anchal, Summary, BHD, Part VI of BHR upgrade - Removal of ITMYC optics  
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Wed Dec 15 16:11:38 2021, Anchal, Summary, BHD, Part VIII of BHR upgrade - Placed LO1
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Wed Dec 15 17:44:18 2021, Koji, Summary, BHD, Part VIII of BHR upgrade - Placed LO1
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Thu Jan 6 21:04:41 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO1 OSEMs inserted
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Mon Jan 10 14:52:51 2022, Anchal, Summary, BHD, LO1 OSEMs roughly calibrated and noise measured 
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Mon Jan 10 18:36:41 2022, Anchal, Summary, BHD, LO1 free swinging test set to trigger
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Tue Jan 11 12:19:12 2022, Anchal, Summary, BHD, LO1 Input Matrix Diagonalization performed. 
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Mon Jan 24 18:53:09 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO2 placed and OSEMs tuned
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Tue Jan 25 10:55:02 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO2 input matrix diagonalization performed.
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Tue Jan 25 16:42:03 2022, Anchal, Summary, BHD, Reduced filter gains in all damped new SOS
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Thu Jan 6 11:54:20 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - Placed AS1 and AS4
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Fri Jan 7 16:17:42 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - Placed AS1 and AS4 filters
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Sat Jan 8 16:01:42 2022, Paco, Summary, BHD, Part IX of BHR upgrade - Placed LO2 filters
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Tue Jan 18 14:26:09 2022, Paco, Summary, BHD, Part IX of BHR upgrade - Placed remaining filters SR2, PR3, PR2
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Tue Jan 11 18:18:29 2022, Anchal, Summary, BHD, Attempted OSEM installation on AS1
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Tue Jan 11 18:40:25 2022, Anchal, Summary, BHD, AS1 Sat Amp has a PCB issue
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Thu Jan 13 09:48:41 2022, Anchal, Summary, BHD, AS1 Sat Amp fixed 
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Thu Jan 13 12:24:08 2022, Anchal, Summary, BHD, AS1 SD and LR magnets broke
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Mon Jan 24 21:18:40 2022, Paco, Summary, BHD, Part IX of BHR upgrade - AS1 placed and OSEM tuned
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Tue Jan 25 11:02:54 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 free swing test failed
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Thu Jan 27 08:27:34 2022, Paco, Summary, BHD, Part IX of BHR upgrade - AS1 inspection and correction
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Wed Feb 2 16:32:02 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 free swing test still not good 
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Tue Mar 15 18:42:37 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 resuspended and OSEMs tuned
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Tue Mar 15 18:45:12 2022, Anchal, Summary, BHD, Part X of BHR upgrade - BHDBS Path setup
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Thu Jan 13 12:29:27 2022, Anchal, Summary, BHD, AS4 LR magnet broke
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Fri Jan 14 18:12:47 2022, Anchal, Summary, BHD, AS4 placed in ITMY Chamber, OSEMs connected
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Tue Jan 18 18:19:22 2022, Koji, Summary, BHD, AS4 placed in ITMY Chamber, OSEMs connected 
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Wed Jan 19 12:56:52 2022, Paco, Summary, BHD, AS4 OSEMs installation
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Thu Jan 20 16:42:55 2022, Paco, Update, BHD, AS4 OSEMs installation - part 2
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Thu Jan 20 18:16:29 2022, Anchal, Update, BHD, AS4 set to trigger free swing test
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Fri Jan 21 16:40:10 2022, Anchal, Update, BHD, AS4 Input Matrix Diagonalization performed. 
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Mon Jan 24 17:12:27 2022, rana, Update, BHD, AS4 Input Matrix Diagonalization performed.
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Mon Jan 24 20:48:48 2022, Anchal, Update, BHD, AS4 Input Matrix Diagonalization performed.
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Tue Jan 18 15:19:49 2022, Paco, Summary, BHD, Part IV of BHR upgrade - Replaced old SR3 with SOS SR2. OSEM tuning attemtped. 
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Tue Jan 18 18:16:28 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 Sat Amp Box inspection
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Wed Jan 19 12:50:10 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 OSEM tuning progress.
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Thu Jan 20 17:03:36 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 OSEM tuned.
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Thu Jan 20 18:41:55 2022, Anchal, Summary, BHD, SR2 set to trigger free swing test
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Fri Jan 21 11:24:42 2022, Anchal, Summary, BHD, SR2 Input Matrix Diagonalization performed. 
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Thu Oct 28 17:01:54 2021, Anchal, Summary, BHD, Part III of BHR upgrade - Adding temp fixed flat mirror for PR2
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Thu Jan 27 17:57:35 2022, Anchal, Summary, BHD, Part III of BHR upgrade - Replaced small suspended PR3 with new SOS PR3 and OSEM tuning
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Thu Jan 27 18:03:36 2022, Paco, Summary, BHD, Part III of BHR upgrade - Install PR2, balance, and attempt OSEM tuning
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Thu Jan 27 20:46:38 2022, Koji, Summary, BHD, Part III of BHR upgrade - Install PR2, balance, and attempt OSEM tuning 
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Fri Jan 28 10:37:59 2022, Paco, Summary, BHD, Part III of BHR upgrade - PR2 OSEM finalized, reinsall LO1 OSEMs
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Fri Jan 28 11:30:52 2022, Koji, Summary, BHD, Part III of BHR upgrade - PR2 OSEM finalized, reinsall LO1 OSEMs
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Fri Jan 28 16:35:18 2022, Anchal, Summary, BHD, AS1, PR2 and PR3 set to trigger free swing test
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Wed Feb 2 16:22:00 2022, Anchal, Summary, BHD, Part III of BHR upgrade - PR2 inpute matrix diagonalized 
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Wed Feb 2 16:27:57 2022, Anchal, Summary, BHD, Part III of BHR upgrade - PR3 inpute matrix diagonalized 
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Wed Oct 27 16:38:02 2021, Anchal, Summary, BHD, Part II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment
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Wed Oct 27 18:11:37 2021, Koji, Summary, BHD, Part II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment
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Wed Oct 27 18:16:45 2021, Koji, Summary, BHD, Part II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment
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Thu Mar 17 17:23:22 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment
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Mon Mar 21 18:24:07 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm
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Thu Mar 24 19:20:28 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm
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Fri Mar 25 18:20:28 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm
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Sat Mar 26 13:04:38 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm
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Thu Mar 31 18:58:16 2022, Ian MacMillan, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm
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Tue Apr 5 18:15:06 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm
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Wed Apr 6 01:20:48 2022, Koji, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm   
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Wed Apr 6 22:51:47 2022, Koji, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm 
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Wed Apr 6 12:03:51 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Yarm
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Thu Apr 7 17:59:51 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Yarm
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Fri Apr 8 17:21:31 2022, Ian MacMillan, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Yarm
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Mon Apr 11 21:13:21 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging
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Mon Apr 11 21:44:14 2022, Koji, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging  
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Thu Apr 14 11:52:57 2022, yehonathan, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging 
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Thu Apr 14 18:39:13 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging
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Mon Apr 18 17:53:45 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging
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Message ID: 16742
Entry time: Thu Mar 24 19:20:28 2022
In reply to: 16740
Reply to this: 16744
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Author: |
Anchal |
Type: |
Summary |
Category: |
BHD |
Subject: |
Part IIa of BHR upgrade - Green laser alignment on Yarm |
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[Anchal, Paco]
Uneloged: yesterday, Paco and Ian tried locking the green laser on Yend to the Y-arm. Nothing noteworthy happened, no luck.
- Started with aligning the green injection to the Iris on table (it was misaligned) and getting it on the ITMY center.
- Then we realized that the beam is going through the focusing leans very offceter. This makes the beam warped and deflected inside that needs to be corrected by mirrors.
- So we decided to adjust the lens position first.
- We realized that lens position is hard to adjust along with keeping the beam hiting ITMY.
- So, we decided to remove the lens first and just align the green beam directly with the Iris on the table and the ITMY center. The beam became as big as ITMY when it reached there without the lens in path. We aligned it to fall on the mirror.
- Then we placed the lens back so that the beam goes through the center of the lens.
- Then we aligned ETMY to get the reflection back to the reflection PD.
- But then when we checked the beam at ITMY again, it was severely missing ITMY. The possible reason is that ETMY is a diverging lens for the beam as well and changing its position changed the beam direction in the beam tube.
- We decided to do another iteration of lens positioning with the new ETMY position. So same steps, removed lens, aligned beam with iris and ITMY, placed back the lens, aligned ETMY again to get reflection back on the PD.
- This time the beam was still reaching ITMY. So we were glad that our iterations converged in 2 repititions.
- Then we aligned ITMY to get counter propagating beam.
- At the end of this alignment:
- We see dips in relfection photodiode counts from 12200 to 9500.
- The ETMY oplev is partially out of range (only 1 of the quadrant seeing light) but that could be because we changed the lens position. So Oplev servo is off.
- We confirmed that the PDH servo is properly connected and loop is on. But we see no HOM catching lock for YARM even after us doing about 10 min search with ITMY-ETMY alignments.
- We are leaving things as it is. We'll continue trying to align the cavity tomorrow. Everyone is welcome to try as long as they restore the positions of the optics to a good state at the end.
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