40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 346 of 346  Not logged in ELOG logo
New entries since:Wed Dec 31 16:00:00 1969
IDup Date Author Type Category Subject Text Attachments
  17407   Fri Jan 20 20:13:20 2023 AnchalUpdateASCInstalled 2 flipper mirrors for handingl MC reflection beam to cameraAfter discussions with Yuta, I figured
that a better optical layout is possible
which does not interfere with the existing
 PXL_20230121_035908170.NIGHT.jpg 
  17408   Sat Jan 21 15:32:40 2023 AnchalUpdateASCAS WFS path nominally setI've completed the beam redirection
path for AS beam to WFS heads in a nominal
way. By that I mean that all mirrors (M1,
 PXL_20230121_231740878.NIGHT.jpg 
  17409   Sat Jan 21 18:01:06 2023 AnchalUpdateALSDFD and Phase tracker AM couplingI took transfer function measurement
of DFD AM coupling using noise excitation.


Noise excitation
 BeatYRFAmplitudeNoiseASDwithSimulation.pdfAWGguiSettingsForSimulatedRFAMNoise.pngDFD_AM_to_Hz_Coupling_upto_0p1Hz.pdfDFD_Phase_Tracker_Noise_Due_To_Amplitude_Noise.pdf 
  17410   Mon Jan 23 11:20:44 2023 JCSummaryBHDBH44 RFPD optical path and LO/AS cameraHere's the beam path of BH44.  BH44.jpg 
  17411   Mon Jan 23 16:31:23 2023 ranaUpdateALSDFD and Phase tracker AM couplingBoth the TF measurement and the noise measurements
are useful, but the nosie measurement is
much more meaningful. Since we expect the
  
  17412   Mon Jan 23 20:50:58 2023 AnchalUpdateASCAS WFS path beam profiledI measured the expected beam profile by
WFS photodiodes by measuring the beam when
mode cleaner was unlocked from the point
 WFSPathBeamProfile.pdfASFocPathBeamProfile.pdfASPathBeamProfile.pdf 
  17413   Mon Jan 23 22:51:17 2023 yutaSummaryBHD60 Hz harmonics side lobe investigations[Paco, Yehonathan, Yuta]

Since we have installed BH44, we
are seeing side lobes of 60 Hz + harmonics
 Screenshot_2023-01-24_11-43-40_POXPOYDark.png 
  17414   Tue Jan 24 11:21:59 2023 yutaSummaryBHDFPMI displacement noise with 60 Hz harmonics side lobesJust to show how bad 60 Hz noise is, I
compared FPMI displacement noise with pre-BH44
era (measured on Jan 13, 40m/17400).
 FPMI_calibrated_noise_20230124_60Hz.pdfScreenshot_2023-01-24_11-27-22_FPMIndscope.png 
  17415   Tue Jan 24 16:12:07 2023 ranaSummaryBHDFPMI displacement noise with 60 Hz harmonics side lobes1) do a comparison with the whtiening before
the ADC on/off. This will tell us if it is
pickup before the whtiening filter or not.
  
  17416   Tue Jan 24 21:04:59 2023 AnchalUpdateASCAS WFS path beam profiledI completed the mode matching calculation
today and found good solution with 360.6
mm ROC PLCX lens at -1.2 m from z=0 point.
 ASBeamFocusingLens.png 
  17417   Tue Jan 24 21:29:31 2023 yutaSummaryBHDElectronics diagram around BH44 and BH551) Turning the whitening filter before
the ADC on/off didn't changed the relative
height of 60 Hz peak compared with the
 BH44BH55Diagram.pdf 
  17418   Wed Jan 25 10:02:47 2023 yehonathanUpdate Earthquake, MC3 watchdog trippedWe came this morning and noticed the FSS_FAST
channel was moving very rapidly. Short inspection
showed that MC3 watchdog got tripped. After
  
  17419   Wed Jan 25 11:35:20 2023 yutaSummaryBHDREFL55 visually inspected, BH44 Kapton tapedFollowing was done to investigate 60 Hz
noise issue, but no significant change in
the FPMI noise observed.
 REFL55.JPGBH44Kapton.JPG20230125_FPMIBHDPDs_Spectra_FPMILockedBH55Locked.pdf20230125_FPMIBHDPDs_Spectra_FPMILockedBH55LockedNoWhitening.pdf20230125_FPMIBHDPDs_Spectra_FPMILockedBH55LockedResG60InCARM.pdf 
  17420   Wed Jan 25 12:49:14 2023 RadhikaUpdateALSXARM green laser lock debugging   XEND_PDHservo_boost_on_gain2.pdfXEND_PDHservo_boost_on_gain4.pdfXEND_PDHservo_boost_on_gain6.pdfXEND_PDHservo_boost_on_gain8.pdfXEND_PDHservo_boost_on_gain10.pdf 
  17421   Wed Jan 25 14:33:07 2023 ranaSummaryBHDREFL55 visually inspected, BH44 Kapton tapedKapton tape is a good insulator, so its
a good block for 60 Hz. But it is mostly
useless for RF since the capacitance between
  
  17422   Wed Jan 25 16:58:19 2023 AlexUpdateCamerasRecording CCD camerasThus far, the software needed for the Magewell
video encoder has been successfully installed
on Donatella. OBS studio has also been installed
  
  17423   Wed Jan 25 18:01:21 2023 yutaSummaryBHDBH44 setup isolated, but 60 Hz noise stays the same[Paco, Anchal, Yuta]

Isolating
BH44 setup from the rest didn't help
 BH44BH55Diagram_Disconnected.pdf20230125_FPMIBHDPDs_Spectra_BothArmsLocked.pdf20230125_FPMIBHDPDs_Spectra_BothArmsLockedBH44Removed.pdf20230125_MCF.pdf 
  17424   Thu Jan 26 00:18:54 2023 KojiUpdateCamerasRecording CCD camerasConnect any video signal supported by the
adapter. Use Windows / Mac or any other OS.
If it keeps complaining, contact Magwell
  
  17425   Thu Jan 26 15:56:30 2023 AnchalUpdateASC1X1 -5V sorenson tripped[Yuta, Anchal]




  
  17426   Thu Jan 26 16:07:05 2023 yutaSummaryPSLPMC aligned, now PMC transmission is 0.7PMC aligned (Attachment #1).
Over the past month, PMC transmission
is actually slowly growing from 0.68 to 0.70
 Screenshot_2023-01-26_16-10-20.pngScreenshot_2023-01-26_16-10-35.png 
  17427   Thu Jan 26 18:20:43 2023 AnchalUpdatePEMHEPA Monitor setup using WFS BLRMSI implemented the BLRMS on WFS1/2_I_PIT/YAW
outputs and using there value, a HEPA state
can be defined. I've currently set it
 HEPA_MONITOR.png 
  17428   Thu Jan 26 23:33:19 2023 KojiUpdateLSCEP30-2 Epoxy bonding for Yuta@OMC Lab
EP30-2 Epoxy bonding of V beam dumps
for LSC PDs.
 PXL_20230127_053113856.jpgPXL_20230127_053145432.jpg 
  17429   Fri Jan 27 11:26:31 2023 ranaUpdatePEMHEPA Monitor setup using WFS BLRMSthis is very exciting! Its the beginning
of the task of reducing vast amounts of PEM
data into human-useful (bite sized) info.
  
  17431   Fri Jan 27 19:35:31 2023 yutaSummaryBHD60 Hz noise investigations around IMCSo far different measurements are consistent
with the hypothesis that the 60 Hz noise
is from PSL frequency noise (40m/17423).
 6x 
  17432   Fri Jan 27 21:22:57 2023 yutaSummaryBHDV beam dump installed for BH44 RF PDOne of these V beam dumps was installed
for BH44 RF PD.
The rest is now stored in the box
 V.JPG 
ELOG V3.1.3-