40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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Entry  Mon Oct 25 13:23:45 2021, Anchal, Summary, BHD, Before photos of BSC 
    Reply  Mon Oct 25 17:37:42 2021, Anchal, Summary, BHD, Part I of BHR upgrade - Removed optics from BSC rn_image_picker_lib_temp_44cb790a-c3b4-42aa-8907-2f9787a02acd.jpgrn_image_picker_lib_temp_0fd8f4fd-64ae-4ccd-8422-cfe929d4eeee.jpg
       Reply  Tue Oct 26 16:56:22 2021, Paco, Summary, BHD, Part I of BHR upgrade - Locked PMC and IMC 
          Reply  Wed Oct 27 16:27:16 2021, Anchal, Summary, BHD, Part II of BHR upgrade - Prep OMCNorthBefore.jpegOMCNorthAfter.jpeg
             Reply  Wed Oct 27 16:31:35 2021, Anchal, Summary, BHD, Part III of BHR upgrade - Removal of PR2 Small Suspension 
                Reply  Thu Oct 28 16:32:32 2021, Paco, Summary, BHD, Part IV of BHR upgrade - Removal of BSC eastern optics 
                   Reply  Fri Nov 5 12:21:16 2021, Anchal, Summary, BHD, Part VI of BHR upgrade - Removal of ITMYC optics XendFlowBenchLeftEnd.jpgXendFlowBenchMiddle.jpgXendFlowBenchRightEnd.jpg
                      Reply  Wed Dec 15 16:11:38 2021, Anchal, Summary, BHD, Part VIII of BHR upgrade - Placed LO1 signal-2021-12-15-161437.jpeg
                         Reply  Wed Dec 15 17:44:18 2021, Koji, Summary, BHD, Part VIII of BHR upgrade - Placed LO1 
                            Reply  Thu Jan 6 21:04:41 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO1 OSEMs inserted 
                               Reply  Mon Jan 10 14:52:51 2022, Anchal, Summary, BHD, LO1 OSEMs roughly calibrated and noise measured LO1_vs_ETMX_OSEM_Spectrum_LF_x30_Gain.pdfLO1_vs_ETMX_OSEM_Spectrum_HF_x30_Gain.pdf
                                  Reply  Mon Jan 10 18:36:41 2022, Anchal, Summary, BHD, LO1 free swinging test set to trigger 
                                     Reply  Tue Jan 11 12:19:12 2022, Anchal, Summary, BHD, LO1 Input Matrix Diagonalization performed. LO1_SUS_InpMat_Diagnolization.pdfLO1_FreeSwingData_PeakFitting.pdf
                               Reply  Mon Jan 24 18:53:09 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO2 placed and OSEMs tuned 
                                  Reply  Tue Jan 25 10:55:02 2022, Anchal, Summary, BHD, Part VIII of BHR upgrade - LO2 input matrix diagonalization performed. 
                                     Reply  Tue Jan 25 16:42:03 2022, Anchal, Summary, BHD, Reduced filter gains in all damped new SOS 
                         Reply  Thu Jan 6 11:54:20 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - Placed AS1 and AS4 
                            Reply  Fri Jan 7 16:17:42 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - Placed AS1 and AS4 filters 
                               Reply  Sat Jan 8 16:01:42 2022, Paco, Summary, BHD, Part IX of BHR upgrade - Placed LO2 filters 
                                  Reply  Tue Jan 18 14:26:09 2022, Paco, Summary, BHD, Part IX of BHR upgrade - Placed remaining filters SR2, PR3, PR2 
                               Reply  Tue Jan 11 18:18:29 2022, Anchal, Summary, BHD, Attempted OSEM installation on AS1 
                                  Reply  Tue Jan 11 18:40:25 2022, Anchal, Summary, BHD, AS1 Sat Amp has a PCB issue signal-2022-01-11-184917.jpeg
                                     Reply  Thu Jan 13 09:48:41 2022, Anchal, Summary, BHD, AS1 Sat Amp fixed signal-2022-01-13-094823_001.jpegsignal-2022-01-13-094823_002.jpeg
                                  Reply  Thu Jan 13 12:24:08 2022, Anchal, Summary, BHD, AS1 SD and LR magnets broke 
                                     Reply  Mon Jan 24 21:18:40 2022, Paco, Summary, BHD, Part IX of BHR upgrade - AS1 placed and OSEM tuned 
                                        Reply  Tue Jan 25 11:02:54 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 free swing test failed AS1_freeSwingTestFailed.pdf
                                           Reply  Thu Jan 27 08:27:34 2022, Paco, Summary, BHD, Part IX of BHR upgrade - AS1 inspection and correction 
                                              Reply  Wed Feb 2 16:32:02 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 free swing test still not good AS1_FreeSwingData_PeakFitting_20220125.pdfAS1_SUS_InpMat_Diagnolization_20220202.pdf
                                                 Reply  Tue Mar 15 18:42:37 2022, Anchal, Summary, BHD, Part IX of BHR upgrade - AS1 resuspended and OSEMs tuned 
                                                    Reply  Tue Mar 15 18:45:12 2022, Anchal, Summary, BHD, Part X of BHR upgrade - BHDBS Path setup 
                            Reply  Thu Jan 13 12:29:27 2022, Anchal, Summary, BHD, AS4 LR magnet broke 
                               Reply  Fri Jan 14 18:12:47 2022, Anchal, Summary, BHD, AS4 placed in ITMY Chamber, OSEMs connected 
                                  Reply  Tue Jan 18 18:19:22 2022, Koji, Summary, BHD, AS4 placed in ITMY Chamber, OSEMs connected Screen_Shot_2022-01-18_at_17.48.16.pngcable_swap.png
                                     Reply  Wed Jan 19 12:56:52 2022, Paco, Summary, BHD, AS4 OSEMs installation 
                                        Reply  Thu Jan 20 16:42:55 2022, Paco, Update, BHD, AS4 OSEMs installation - part 2 
                                           Reply  Thu Jan 20 18:16:29 2022, Anchal, Update, BHD, AS4 set to trigger free swing test 
                                              Reply  Fri Jan 21 16:40:10 2022, Anchal, Update, BHD, AS4 Input Matrix Diagonalization performed.  AS4_SUS_InpMat_Diagnolization_20220121.pdfAS4_FreeSwingData_PeakFitting_20220121.pdf
                                                 Reply  Mon Jan 24 17:12:27 2022, rana, Update, BHD, AS4 Input Matrix Diagonalization performed.  
                                                    Reply  Mon Jan 24 20:48:48 2022, Anchal, Update, BHD, AS4 Input Matrix Diagonalization performed.  
                   Reply  Tue Jan 18 15:19:49 2022, Paco, Summary, BHD, Part IV of BHR upgrade - Replaced old SR3 with SOS SR2. OSEM tuning attemtped. PXL_20220119_012954365.jpgPXL_20220119_013003522.jpg
                      Reply  Tue Jan 18 18:16:28 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 Sat Amp Box inspection 
                         Reply  Wed Jan 19 12:50:10 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 OSEM tuning progress. 
                            Reply  Thu Jan 20 17:03:36 2022, Anchal, Summary, BHD, Part IV of BHR upgrade - SR2 OSEM tuned. DJI_0144.JPG
                               Reply  Thu Jan 20 18:41:55 2022, Anchal, Summary, BHD, SR2 set to trigger free swing test 
                                  Reply  Fri Jan 21 11:24:42 2022, Anchal, Summary, BHD, SR2 Input Matrix Diagonalization performed.  SR2_SUS_InpMat_Diagnolization_20220121.pdfSR2_FreeSwingData_PeakFitting_20220121.pdf
                Reply  Thu Oct 28 17:01:54 2021, Anchal, Summary, BHD, Part III of BHR upgrade - Adding temp fixed flat mirror for PR2 
                Reply  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 
                   Reply  Thu Jan 27 18:03:36 2022, Paco, Summary, BHD, Part III of BHR upgrade - Install PR2, balance, and attempt OSEM tuning 
                      Reply  Thu Jan 27 20:46:38 2022, Koji, Summary, BHD, Part III of BHR upgrade - Install PR2, balance, and attempt OSEM tuning Screen_Shot_2022-01-27_at_20.33.56.pngScreen_Shot_2022-01-27_at_21.30.16.png
                         Reply  Fri Jan 28 10:37:59 2022, Paco, Summary, BHD, Part III of BHR upgrade - PR2 OSEM finalized, reinsall LO1 OSEMs 
                            Reply  Fri Jan 28 11:30:52 2022, Koji, Summary, BHD, Part III of BHR upgrade - PR2 OSEM finalized, reinsall LO1 OSEMs 
                               Reply  Fri Jan 28 16:35:18 2022, Anchal, Summary, BHD, AS1, PR2 and PR3 set to trigger free swing test 
                            Reply  Wed Feb 2 16:22:00 2022, Anchal, Summary, BHD, Part III of BHR upgrade - PR2 inpute matrix diagonalized PR2_FreeSwingData_PeakFitting_20220125.pdfPR2_SUS_InpMat_Diagnolization_20220202.pdf
                   Reply  Wed Feb 2 16:27:57 2022, Anchal, Summary, BHD, Part III of BHR upgrade - PR3 inpute matrix diagonalized PR3_FreeSwingData_PeakFitting_20220125.pdfPR3_SUS_InpMat_Diagnolization_20220202.pdf
             Reply  Wed Oct 27 16:38:02 2021, Anchal, Summary, BHD, Part II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment 
                Reply  Wed Oct 27 18:11:37 2021, Koji, Summary, BHD, Part II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment 
                Reply  Wed Oct 27 18:16:45 2021, Koji, Summary, BHD, Part II of BHR upgrade - Relocation of TT2 and MMT1/2 alignment 
             Reply  Thu Mar 17 17:23:22 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment 
                Reply  Mon Mar 21 18:24:07 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm 
                   Reply  Thu Mar 24 19:20:28 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm 
                      Reply  Fri Mar 25 18:20:28 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm 
                         Reply  Sat Mar 26 13:04:38 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - Green laser alignment on Yarm 
                            Reply  Thu Mar 31 18:58:16 2022, Ian MacMillan, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm 
                               Reply  Tue Apr 5 18:15:06 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm 
                                  Reply  Wed Apr 6 01:20:48 2022, Koji, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm PXL_20220406_060846581.jpgPXL_20220406_014205726.jpgPXL_20220406_060324812.jpgPXL_20220406_015259326.jpg
                                     Reply  Wed Apr 6 22:51:47 2022, Koji, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Xarm PXL_20220406_213356237.MP.jpgPXL_20220406_212936502.MP.jpg
                                  Reply  Wed Apr 6 12:03:51 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Yarm 
                                     Reply  Thu Apr 7 17:59:51 2022, Anchal, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Yarm 
                                        Reply  Fri Apr 8 17:21:31 2022, Ian MacMillan, Summary, BHD, Part IIa of BHR upgrade - IR laser alignment on Yarm 
                                           Reply  Mon Apr 11 21:13:21 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging 
                                              Reply  Mon Apr 11 21:44:14 2022, Koji, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging D990543A1.PDFPXL_20220412_023941730.jpgPXL_20220412_023950567.jpg
                                                 Reply  Thu Apr 14 11:52:57 2022, yehonathan, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging Screenshot_2022-04-14_15-53-39.pngPXL_20220414_220616875.jpg
                                                    Reply  Thu Apr 14 18:39:13 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging 
                                                       Reply  Mon Apr 18 17:53:45 2022, Paco, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging 
Message ID: 16742     Entry time: Thu Mar 24 19:20:28 2022     In reply to: 16740     Reply to this: 16744
Author: Anchal 
Type: Summary 
Category: BHD 
Subject: Part IIa of BHR upgrade - Green laser alignment on Yarm 

[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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