40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  OMC elog, Page 7 of 9  Not logged in ELOG logo
ID Date Authordown Type Category Subject Text Attachments
  273   Thu Dec 8 21:17:09 2016 KojiGeneralGeneralOMC placed on the table / the beam roughly alignedThe OMC cavity was locked. The alignment
was precisely adjusted. The mode matching
was optimized by the lens positions. The
  
  274   Thu Jan 19 20:57:53 2017 KojiSupplyGeneralPurchaseOrdered:

Office Depot
v AA battery Qty. 24
  
  275   Thu Feb 16 17:23:12 2017 KojiSupplyGeneralPurchase
BNC Patch Panel

8x
Amphenol Connex 112443 / Isolated BNC FEMALE
TO FEMALE BULKHEAD ISOLATED ADAPTER - 50
  
  276   Tue Mar 28 21:04:27 2017 KojiElectronicsCharacterizationPDH ampAttachment 1: PDH amp
RF part (before the preamp was installed)

Attachment 2:
 6x 
  277   Tue May 16 19:05:18 2017 KojiOpticsConfigurationOMC SN002 fix - temporary opticsWorking on the SN002 OMC fix. Checked the
inventory. I think I am using C8 mirror as
the new temporary CM1 and PZT24 as the new
  
  278   Fri May 26 21:53:20 2017 KojiGeneralConfigurationTrans RF PD setupRecent work

- DC output of the trans RF PD
was connected to the BNC patch panel. =>
  
  279   Tue Jun 6 00:49:48 2017 KojiGeneralConfigurationTrans RF PD setupLast week, I further worked on the RF system
to install 20dB coupler on the agilent unit
and setup the R channel. This allowed me
  
  280   Tue Jun 6 22:00:36 2017 KojiGeneralConfigurationTrans RF PD setup- Replaced the PZT with the one used from
the beginning. This must be PZT #21. After
the replacement, the spot positions look
  
  281   Fri Jun 23 01:58:11 2017 KojiOpticsGeneralOMC #002 Repair - CM1 gluing[Alena, Koji]

Jun 21: Alena and Koji
worked on gluing of the CM1 mirror on the
 6x 
  282   Fri Jun 23 10:55:07 2017 KojiOpticsGeneralDust layer on black glass beam dumps?I wondered why the black glass beam dumps
looked not as shiny as before. It was in
fact a layer of dusts (or contaminants) accumulated
 black_glass_dust.JPG 
  283   Sat Jul 1 15:29:57 2017 KojiOpticsGeneralBlack glass cleaning / Final bonding for the emergency repair for OMC #002[Alena, Koji] 

Report of the work on June
30.
 DSC_0347.jpgDSC_0348.jpgDSC_0350.jpgDSC_0352.jpgDSC_0354.jpg 
  284   Sat Jul 1 21:33:18 2017 KojiGeneralGeneralSome purchase notes- Forgot to close the cylinder valve...

v HEPA prefilter (20"x20"x1"
MERV 7)
  
  285   Wed Jul 5 16:59:44 2017 KojiGeneralGeneralThe OMC #002 was packed[Stephen Koji]

The OMC #002 was packed for the
transportation to Downs.
 DSC_0360.JPG 
  287   Sat Jul 29 21:42:51 2017 KojiElectronicsCharacterizationPDH ampThe polarities indicated in the right circuits
were opposite, obviously.
  
  288   Fri Sep 8 15:14:05 2017 KojiFacilityGeneralPreparation for the plumbing work[Steve, Aaron, Koji]

We've finished the preparation
for the forthcoming plumbing work on (nominally)
 7x 
  289   Mon Nov 27 20:24:24 2017 KojiGeneralGeneralA former LHO PD (Trans) removed from the OMC #002 for the shipment to StockholmAttachment 1: The PD was
removed from the transmission side of the
OMC #002 (former LHO OMC - the one blasted
 6x 
  291   Thu Feb 22 20:21:02 2018 KojiOpticsCharacterizationaLIGO EOM testPOSTED
to 40m ELOG
  
  292   Mon Apr 2 17:27:04 2018 KojiOpticsCharacterizationaLIGO EOM test2nd optical test http://nodus.ligo.caltech.edu:8080/40m/13725   
  294   Sat May 5 22:51:04 2018 KojiOpticsGeneral3IFO EOM Optical testThe 3IFO EOM test performed at
the 40m. Result: 40m
ELOG 13819
  
  295   Tue May 15 19:53:45 2018 KojiOpticsGeneralEOM Q comparisonQs' were estimated with a lorentzian
function (eye fit)

  
  296   Wed May 30 16:40:38 2018 KojiMechanicsCharacterizationEOM mount stability testhttps://awiki.ligo-wa.caltech.edu/wiki/EOM_Mount_Stability   
  297   Wed May 30 17:44:23 2018 KojiOpticsCharacterization3IFO EOM surface check3IFO EOM dark microscope images courtesy
by GariLynn and Rich

Attachment1/2: Hole #1
 IMG_5756.JPGIMG_5757.JPGIMG_5758.JPGIMG_5759.JPGLooking_at_Hole2.png 
  298   Mon Jul 2 11:30:22 2018 KojiElectronicsCharacterization3IFO EOM impedance measurement[Rich Koji]

3IFO EOM (before any modification)
was tested to measure the impedance of each
 impedance_eom.pdfEOM_Z_DATA.zip 
  299   Mon Jul 2 12:29:01 2018 KojiElectronicsCharacterizationImpedances of individual components (3IFO EOM)[Rich Koji]

The impedances of the individual
components from the 3IFO EOM (before modification)
 impedance_coils.pdfimpedance_xtals.pdfq_coils.pdfcomponent_models.pdfliso_models.zip 
  302   Wed Jul 4 18:30:51 2018 KojiElectronicsCharacterizationEOM circuit modelsThe circuit models for the 3IFO EOM (before
mods) were made using LISO.
Then the modification plan was made
 eom_models.pdfeom9.pdfeom24.pdfeom45.pdf180704_3IFO_EOM_model.zip 
  303   Thu Jul 26 20:57:07 2018 KojiElectronicsCharacterization9MHz port tuned impedance[Rich Koji]

The 9MHz port was tuned and the
impedance was measured.
 impedance_eom.pdfeom9.pdfeom_models_9MHz.pdf 
  304   Tue Aug 7 15:43:12 2018 KojiElectronicsCharacterizationNew LLO EOM stuffed[Rich, Dean, Koji]

Stuffed all inductors for the new
LLO EOM. As the impedances were sensitive
 P_20180806_154457.jpgimpedance_eom.pdfimpedance_eom_zoom.pdf 
  306   Thu Aug 9 11:24:29 2018 KojiGeneralCharacterizationModulation Index Test Setup at 40m Lab[Rich Koji]

The impedances of the new LLO EOM
were measured with the beat note setup at
 modulation_depth.pdfmodulation_depth_zoom.pdf 
  307   Wed Aug 29 11:06:30 2018 KojiGeneralGeneralRF AM RIN and dBc conversion0. If you have an RF signal whose waveform
is , the amplitude is constant and 1.
  
  308   Sun Sep 23 19:42:21 2018 KojiOpticsGeneralMontecarlo simulation of the phase difference between P and S pols for a modeled HR mirror[Koji Gautam]


With Gautam's help,
I ran a coating design code for an HR mirror
 reflectivities.pngtransmission.pngphase_diff.pngphase_difference_histogram.png 
  311   Thu Jan 10 20:42:54 2019 KojiOpticsCharacterizationFSR / HOM Test of OMC SN002OMC SN002 = Former LHO OMC
which CM1 was destroyed by the lock loss
pulse in 2016. This OMC needs to be optically
  
  312   Thu Jan 10 20:45:00 2019 KojiOpticsCharacterizationPZT test cableAs OMC SN002 already has the PZTs connected
to the Mighty-Mouse connector, a test cable
with a female mighty-mouse connector was
 OMC_PZT_wiring.pdf 
  313   Sat Jan 12 22:49:11 2019 KojiOpticsCharacterizationPM-SM patch cable mode cleaning effectMode
cleaning capability of an optical fiber was
measured. The conclusion
 fiber_mode_cleaning.pdf 
  314   Fri Feb 1 12:52:12 2019 KojiMechanicsGeneralPZT deformation simulationA simple COMSOL simulation was run to see
how the PZT deforms as the voltage applied.

Use the geometry of the ring PZT
 pzt.png 
  315   Sat Feb 2 16:17:13 2019 KojiOpticsCharacterizationSummary: OMC(001) HOM structure recalculationEach peak of the transfer function measurement
was fitted again with a complex function:

 OMC_HOM_130531.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_HOM.pdf 
  316   Sat Feb 2 20:03:19 2019 KojiOpticsCharacterizationSummary: OMC(002) HOM structure recalculation (before mirror replacement)OMC (002)
History: Measurement date
2013/10/11, Installed to L1 2013/XX
 OMC_HOM_131011.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT_HOM.pdf 
  317   Sat Feb 2 20:28:21 2019 KojiOpticsCharacterizationSummary: OMC(003) HOM structure recalculationOMC (003)
History: Measurement date
2014/7/5, Stored for I1, Installed to H1
 OMC_HOM_140705.pdfHOM_PZTV_PZT1_0V.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT_HOM.pdf 
  318   Sat Feb 2 20:35:02 2019 KojiOpticsCharacterization Summary: OMC(002) HOM structure recalculation (after mirror replacement) OMC (002) after repair
History:Mirror replacement
after the damage at H1. Measurement date
 OMC_HOM_190110.pdfHOM_PZTV.pdfHOM_plot_PZT0_0.pdfCav_scan_response_PZT.pdf 
  319   Tue Mar 19 17:30:25 2019 KojiGeneralCharacterizationOMC (002) Test itemsOMC #002 Optical tests


FSR
measurement (done, 2019/1/8-9, 2019/4/1)
  
  320   Thu Mar 28 16:36:52 2019 KojiMechanicsCharacterizationOMC(002) PZT characterization As
performed in the ELOG 202, the PZTs of
the OMC 002 were tested.
 PZT_Scan.pdfOMC_PZT_Response.pdf 
  321   Thu Apr 4 20:07:39 2019 KojiSupplyGeneralPurchase== Office Depot ==
Really
Useful Box 9L x 6 (delivered)
  
  322   Fri Apr 5 01:07:18 2019 KojiOpticsCharacterizationOMC(002): transmitted beam imagesThere was a concern that the transmission
from CM1 has additional fringes. The shape
of the transmitted beams from CM1, CM2, and
 CM1trasns.pngCM2trasns.pngFM2trans2.png 
  323   Fri Apr 5 01:08:17 2019 KojiOpticsCharacterizationOMC(002): DCPD / QPD alignmentThe beam height in the cavity became totally
different from the previous one and the shims
needed to be much thicker than before. This
 IMG_7521.JPGIMG_7529.JPGIMG_7539.JPGIMG_7541.JPG 
  324   Fri Apr 5 20:50:54 2019 KojiOpticsCharacterizationOMC(002): QPD alignmentQPD#             
QPD1      
QPD2
 P_20190405_215906.jpgP_20190405_215927.jpg 
  325   Fri Apr 5 23:30:20 2019 KojiGeneralGeneralOMC (002) repair completedOMC(002)
repair completed

When the cable harness of OMC(004)
 P_20190405_222401.jpgP_20190405_222509.jpgP_20190405_222529.jpg 
  326   Wed Apr 10 19:22:24 2019 KojiGeneralGeneralOMC(004): preparation for the PZT subassembly bonding Preparation for the PZT subassembly
bonding (Section 6.2 and 7.3 of T1500060
(aLIGO OMC optical testing procedure)
  
  328   Thu Apr 11 12:15:31 2019 KojiMechanicsConfigurationPZT sub assy mirror orientations   PZT_subassy.pngPZT_subassy.pdf 
  329   Thu Apr 11 21:22:26 2019 KojiMechanicsGeneralOMC(004): PZT sub-assembly gluing[Koji Stephen]

The four PZT sub-assemblies were
glued in the gluing fixtures. There were
 IMG_7561.jpgIMG_7567.jpg 
  330   Thu Apr 11 21:22:58 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly air baking[Stephen Koji]

The baking of the PZT subassemblies
was more complicated than we initially thought.
 temp_profile.pdfbake.xlsx 
  331   Sun Apr 14 23:58:49 2019 KojiGeneralGeneralOMC(004): PZT sub-assembly post air-bake inspection[Koji Stephen]

(Friday afternoon) We retrieved
the PZT sub-assemblies to the clean room.
  
ELOG V3.1.3-