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ID Date Author Type Category Subjectdown Text Attachments
  4831   Fri Jun 17 08:03:48 2011 steveUpdateSUSITMY sus damping restoredITMY sus damping restored.
 
  
  5320   Mon Aug 29 18:24:11 2011 jamieUpdateSUSITMY stuck to OSEMs?ITMY, which is supposed to be fully free-swinging
at the moment, is displaying the tell-tale
signs of  being stuck to one of it's
  
  2623   Mon Feb 22 10:25:37 2010 JenneUpdateCOCITMY standoff and guiderod epoxiedThis work happened on Friday, after Nodus
and the elog went down....
[Jenne, Kiwamu]
  
  5326   Tue Aug 30 14:44:06 2011 kiwamuUpdateSUSITMY released without opening chambersThe
ITMY mirror was released. The OSEM readouts
became healthy.
  
  5458   Mon Sep 19 13:13:10 2011 PaulUpdateSUSITMY oplev available for use: SRM not for the moment I've got the bench set up for the
measurement of the beam spot change with
DC SRM alignment offsets. The ITMY oplev
  
  12720   Sat Jan 14 22:39:30 2017 ranaSummarySUSITMY is drifting ?https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20170114/sus/susdrift/

ITMY is not like the others. Real
or just OSEM madness?
  
  12455   Tue Aug 30 20:26:36 2016 gautamUpdateSUSITMY installed[gautam,
johannes, lydia]
 IMG_3052.JPGSRM_sensor_level_comp.pngETMY_BounceSpectra_30Aug2016.pdf 
  14623   Mon May 20 11:33:46 2019 gautamUpdateSUSITMY inspectionWith Chub providing illumination via the
camera viewport, I was able to take photos
of ITMY this morning. All the magnets look
  
  14443   Fri Feb 8 02:00:34 2019 gautamUpdateSUSITMY has tendency of getting stuckAs it turns out, now ITMY has a tendency
to get stuck. I found it MUCH
more difficult to release the optic using
 Screenshot_from_2019-02-08_02-04-22.png 
  14506   Mon Apr 1 22:33:00 2019 gautamUpdateCDSITMY freedWhile Anjali is working on the 1um MZ setup,
the pesky ITMY was liberated from the OSEMs.
The "algorithm" :
  
  14508   Tue Apr 2 15:02:53 2019 JonUpdateCDSITMY freed    
  12456   Wed Aug 31 18:07:43 2016 JohannesUpdateSUSITMY free swinging[Lydia, Gautam, Koji, Johannes]

Summary of things done today:
  
  16569   Tue Jan 11 10:23:18 2022 PacoUpdateElectronicsITMY feedthroughs and in-vac cables installed - part II[Paco, Chub]

The ITMY 10" flange with 4
DSUB-25 feedthroughs has been installed with
  
  16563   Mon Jan 10 15:45:55 2022 PacoUpdateElectronicsITMY feedthroughs and in-vac cables installed - part IThe ITMY 10" flange with 10 DSUB-25
feedthroughs has been installed with the
cables connected at the in-vac side. 
  
  1188   Mon Dec 8 17:50:21 2008 YoichiUpdateSUSITMY driftThe suspension drift monitor shows that the
ITMY alignment was shifted after the earthquake.
Looks like only the UL sensor had a step
 ITMY-OSEMs.pngITMY-UL.pngITMY-08-18.pdfITMY-12-08.pdf 
  5562   Wed Sep 28 07:36:41 2011 steveUpdateSUSITMY damping restoredITMY suspention damping restored   
  16899   Tue Jun 7 19:40:45 2022 AnchalUpdateSUSITMY changed output matrix to disable use of UL coilSince UL coil actuation is lost, we modified
the output matrix of ITMY to use only UR,
LR and LL face coils for POS, PIT and YAW
 ITMY_PIT_to_POS-PIT-YAW_Coupling.pdfITMY_YAW_to_POS-PIT-YAW_Coupling.pdf 
  16868   Fri May 20 20:03:48 2022 PacoUpdateBHDITMY chamber work finished - LO and AS overlapped[Paco, Anchal, Yuta]

Today, in short we:


Recovered alignment of
 Screenshot_2022-05-20_20-38-25.pngOSEMs.txt 
  5351   Wed Sep 7 00:01:23 2011 SureshUpdateIOOITMY chamber ready for heavy doors[Jenne, Suresh]
We did the following things in the
ITMY chamber today:
  
  4878   Fri Jun 24 10:38:01 2011 steveUpdateCamerasITMY camera gets fixedITMY gets new Tamron M118FM50 that has
improved close focusing. It is a small fixed
focal length camera so the video tube cover
  
  5487   Tue Sep 20 18:03:45 2011 PaulUpdateSUSITMY and SRM oplev calibrations - measured and estimatedThe measured calibration factors for the
oplevs are as follows:
 
SRM pitch: 666urad
  
  5488   Tue Sep 20 19:00:49 2011 PaulUpdateSUSITMY and SRM oplev calibrations - measured and estimated 
Kiwamu noticed that the 1/L in the
counts per radian should have just been L,
  
  5494   Wed Sep 21 00:37:01 2011 ranaUpdateSUSITMY and SRM oplev calibrations - measured and estimatedI found that some of the Optical Lever
Servos were ON today and injecting nonsense
into the interferometer optics. I have set
  
  5496   Wed Sep 21 09:10:15 2011 PaulUpdateSUSITMY and SRM oplev calibrations - measured and estimated

    

       
            
  
  5457   Mon Sep 19 12:23:30 2011 PaulUpdateSUSITMY and SRM oplev beam size reduced + next stepsI replaced the lenses that were there with
a -150mm lens followed by a +250mm lens.
This gave a significantly reduced beam size
  
  5499   Wed Sep 21 14:44:25 2011 PaulUpdateSUSITMY and SRM open loop transfer functions 
 Here are the open loop transfer
functions for ITMY and SRM. The various settings
 ITMY_SRM_oplev_OLTFs.png 
  5507   Wed Sep 21 23:05:16 2011 PaulUpdateSUSITMY and SRM actuator response functions - fitting results I used an fminsearch function to
fit the SRM and ITMY actuator response magnitudes.
The testfunction was just that for a single
 ITMY_PITCH_actuator_response_FIT.pngITMY_YAW_actuator_response_FIT.pngSRM_PITCH_actuator_response_FIT.pngSRM_YAW_actuator_response_FIT.png 
  5510   Thu Sep 22 00:00:10 2011 PaulUpdateSUSITMY and SRM actuator response functions - complex fitting resultsHere are the results of the complex fitting.
The residuals are bigger this time, but still
probably small enough to be ok(?), with the
 ITMY_PITCH_actuator_response_complex_FIT.pngITMY_YAW_actuator_response_complex_FIT.pngSRM_PITCH_actuator_response_complex_FIT.pngSRM_YAW_actuator_response_complex_FIT.png 
  5501   Wed Sep 21 16:31:28 2011 PaulUpdateSUSITMY and SRM actuator response functions I divided the open loop transfer
functions by the filter response and the
sensor responses (previously measured calibration
 ITMY_PITCH_actuator_response.pngITMY_YAW_actuator_response.pngSRM_PITCH_actuator_response.pngSRM_YAW_actuator_response.png 
  5418   Thu Sep 15 16:45:59 2011 PaulUpdateSUSITMY and SRM Oplev statusToday I worked on getting the ITMY and
SRM oplevs back in working order. I aligned
the SRM path back onto the QPD. I put excitations
  
  5422   Thu Sep 15 18:24:54 2011 PaulUpdateSUSITMY and SRM Oplev current status - comparison with ITMYJust to find out where we are currently,
I plotted the ITMY and SRM oplev spectra
along with the ETMY oplev spectra. ETMY seems
 oplev_spectra_comparison.pdf 
  5423   Thu Sep 15 18:31:27 2011 PaulUpdateSUSITMY and SRM Oplev current status - comparison with ITMY

    

       
            
  
  8172   Tue Feb 26 16:13:18 2013 BrettUpdateSUSITMY and ETMY mysterious loop gain difference of 2.5While doing initial measurements for the
new global damping infrastructure I discovered
that the ETMY loop between the OSEM actuation
 Screenshot.png 
  14627   Mon May 20 22:06:07 2019 gautamUpdateSUSITMY also kickedFor good measure:

  
  16903   Wed Jun 8 18:16:20 2022 yutaUpdateSUSITMY ULCOIL mystery: Coil driver swap testTo see if the ULCOIL channel of the ITMY coil driver
is working or not, I swapped ITMY coil
 Screenshot_2022-06-08_18-10-44.pngSWAP.JPG 
  16904   Thu Jun 9 23:08:39 2022 ranaUpdateSUSITMY ULCOIL mystery: Coil driver swap testwhat was the result of the inductance measurement?
should be ~3.3 mH as measured from the flannge
or cable that goes to the flange from sat
  
  16905   Fri Jun 10 13:02:14 2022 yutaUpdateSUSITMY ULCOIL mystery: Coil driver swap testITMY ULCOIL was measured to have ~3.3 mH
as measured from the flange. RTFE 40m/16896
.
  
  16908   Fri Jun 10 15:04:23 2022 ranaUpdateSUSITMY ULCOIL mystery: Coil driver swap testIts good that the inductance test passed.
This means that the coil is OK. How does
the inspection photo look? This is the one
  
  16910   Fri Jun 10 21:10:01 2022 yutaUpdateSUSITMY ULCOIL mystery: Coil driver swap testWe checked the photos we have, but we didn't
have the photos which show ULCOIL situation
clearly.
  
  16896   Tue Jun 7 17:26:21 2022 yutaUpdateSUSITMY ULCOIL mystery not solved[Paco, Yuta]

We investigated the ITMY ULCOIL
issue (40m/16873).
 ULCoilInductance.JPGULCoilResistance.JPGWrongSetting.JPG 
  16920   Wed Jun 15 17:03:17 2022 yutaUpdateSUSITMY ULCOIL issue solved, loose connection in sat amp box[Anchal, Yuta]

We fixed the issue of ITMY ULCOIL
 Measured16Ohms.JPGSatAmpTerminator.JPGBAD.JPGSUCCESSFUL_KICK.png 
  12638   Wed Nov 23 16:21:02 2016 gautamUpdateLSCITMY UL glitches are back 




 ITMYproblemsBack.png 
  12643   Mon Nov 28 10:27:13 2016 gautamUpdateSUSITMY UL glitches are backI left the tester box plugged in from Thursday
night to Sunday afternoon, and in this period,
the glitches still appeared in (and only
 ITMY_satboxSpectra.pdfITMY_UL_testerBox.png 
  12644   Tue Nov 29 11:07:37 2016 SteveUpdateLSCITMY UL glitches are back400 days plot. Satelite amp ITMY has been
swapped with ETMY

Unlabeled sat.amps are labeled.
 gliching400d.png 
  975   Mon Sep 22 12:06:58 2008 robUpdateSUSITMY UL OSEM

Last week I found the ITMY UL OSEM dead.
  
  2024   Tue Sep 29 23:43:46 2009 robUpdateSUSITMY UL OSEMWe had a redo of elog entry 975
tonight.  The noisy OSEM was fixed by
jiggling the rack end of the long cable. 
 ITMYosemBAD.pdf 
  13830   Thu May 10 11:38:19 2018 gautamUpdateGeneralITMY ULLooking at Steve's plot, I was reminded
of the ITMY UL OSEM issue. The numbers don't
make sense to me though - 300um of DC shift
 ITMY_UL.pdf 
  5436   Fri Sep 16 16:34:54 2011 PaulUpdateSUSITMY SRM oplev telescope planI've calculated a suitable collimating
telescope for the ITMY/SRM oplev laser, based
on the specs for the soon-to-arrive 2mW laser
 ITMY_SRM_telescope.png 
  16780   Thu Apr 14 18:34:51 2022 PacoSummaryBHDITMY Oplev reinstalled (Re: 2 in oplev mirrors incompatible with LMR2V)[Paco, Yehonathan]

We installed ITMYOL1 and ITMYOL2
on the ITMY chamber. We aligned the ITMY
  
  10253   Tue Jul 22 15:54:19 2014 ericqUpdateSUSITMY Oplev Recentered ITMY oplev was nearly clipping in
yaw, causing wonky behavior (POY lock popping
in and out frequently). I recentered it and
  
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