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  40m Log, Page 3 of 339  Not logged in ELOG logo
ID Datedown Author Type Category Subject Text Attachments
  16990   Tue Jul 12 09:25:09 2022 ranaUpdateIOOIMC WFSMC WFS
Demod board needs some attention.
  
  16989   Tue Jul 12 09:14:50 2022 ranaUpdateBHDMICH AS55 noise budgetLooking good:


I think the notches you
see in he measured noise are a clue as to
  
  16988   Mon Jul 11 19:29:23 2022 PacoSummaryGeneralFinalizing recovery -- timing issues, cds, MC1[Yuta, Koji, Paco]

Restarting
CDS

We were having
  
  16987   Mon Jul 11 17:41:52 2022 KojiHowToVACStartup after Power Outage- Once the FRG gauge readings are back
(see next elog by Tega), I could open V1
to pump down the main vacuum manifold.
 Screen_Shot_2022-07-11_at_18.13.00.png 
  16986   Mon Jul 11 17:25:43 2022 TegaUpdateVACfixed obsolete reference bug in serial_XGS600 serviceKoji noticed that the FRG sensors were
not updating due to reference to an
obsolete modbusIOC_XGS service, which was
  
  16985   Mon Jul 11 15:26:12 2022 JCHowToVACStartup after Power Outage[Koji, Jc]

Koji and I began starting that
Vacuum system up.
  
  16984   Mon Jul 11 11:56:40 2022 he YehonathanUpdateBHDMICH AS55 noise budgetI calculated a noise budget for the MICH
using AS55 as a sensor. The calculation includes
closed-loop TF calculations.
 Control_Diagram.pdfMICH_AS55_Noise_Budget.pdf 
  16983   Mon Jul 11 11:16:45 2022 JCSummaryElectronicsStartup after Shutdown[Paco, Yehonathan, JC]

We began starting up all the electronics
this morning beginning in the Y-end. After
  
  16982   Fri Jul 8 23:10:04 2022 KojiSummaryGeneralJuly 9th, 2022 Power Outage Prep The 40m team worked on the power outage
preparation. The detailed is summarized on
this wiki page. We will still be able to
  
  16981   Fri Jul 8 16:18:35 2022 ranaUpdateLSCActuator calibration of MC2 using Yarmalthough I know that Yuta knows this, I
will just put this here to be clear: the
NNN/f^2 calibration is only accurate abouve
  
  16980   Fri Jul 8 14:03:33 2022 JCHowToVACVacuum Preparation for Power Shutdown [Koji, JC]

Koji and I have prepared the vacuum
system for the power outage on Saturday.
 Screen_Shot_2022-07-12_at_7.02.14_AM.png 
  16979   Thu Jul 7 21:25:48 2022 TegaSummaryCDSUse osem variance to turn off SUS damping instead of coil outputs[Anchal, Tega]

Implemented
ramp down of coil bias voltage when
  
  16978   Thu Jul 7 18:22:12 2022 yutaUpdateLSCActuator calibration of MC2 using Yarm(This is also
a restore of elog 40m/16971
from Jul 5, 2022 at 17:36)
 TF.pngMC2.png 
  16977   Thu Jul 7 18:18:19 2022 yutaUpdateLSCActuator calibration of ETMX and ETMX(This is a
complete restore of elog 40m/16970
from July 5, 2022 at 14:34)
 Screenshot_2022-07-05_14-52-01_OLTF.pngScreenshot_2022-07-05_14-54-03_TF.pngScreenshot_2022-07-05_14-56-41_Ratio.png 
  16976   Wed Jul 6 22:40:03 2022 TegaSummaryCDSUse osem variance to turn off SUS damping instead of coil outputsI updated the database
files for the 7 BHD optics to separate
the OSEM variance trigger and the LATCH_OFF
  
  16975   Wed Jul 6 19:58:16 2022 PacoSummaryNoiseBudgetXARM noise budget[Anchal, Paco, Rana]

We locked the XARM
using POX11
 xarm_nb_2022_07.pdf 
  16974   Wed Jul 6 18:51:20 2022 DeekshaUpdateElectronicsMeasuring the Transfer Function of the PZTYesterday, we set up the loop to measure
the PZT of the transfer function - the MokuLab
sends an excitation (note - a swept sine
 pzt_transfer_fn.pngckt_diagram.jpegMokuPhaseMeterTFData_20220706_174753_TF_Data.txt 
  16973   Wed Jul 6 15:28:18 2022 TegaUpdateSUSOutput matrix diagonalisation : F2P coil balancinggit repo : https://git.ligo.org/40m/scripts/-/tree/main/SUS/OutMatCalc

local dir: 
  
  16972   Tue Jul 5 20:05:06 2022 TomislavUpdateElectronicsWhitening electronics noiseFor whitening electronics noise for WFS1,
I get (attachment). This doesn't seem
right, right?
 whitening_noises.png 
  16969   Fri Jul 1 12:49:52 2022 KojiUpdateIOOMC2 seemed misaligned / fixedI found the IMC was largely misaligned
and was not locking. The WFS feedback signals
were saturated and MC2 was still largely
 C1-MULTI_FBDB3F_TIMESERIES-1340668818-86400.pngC1-LOCKED_MC_5E4267_TIMESERIES-1340668818-86400.png 
  16968   Fri Jul 1 08:50:48 2022 yutaSummaryLSCFPMI with REFL/AS55 trial[Anchal, Paco, Yuta]

We tried to lock FPMI with REFL55
and AS55 this week, but no success yet.
  
  16967   Thu Jun 30 19:24:24 2022 ranaSummaryPEMeffect of nearby CES constructionFor the proposed construction in the NW
corner of the CES building (near the 40m
BS chamber), they did a simulated construction
  
  16966   Thu Jun 30 19:04:55 2022 ranaSummaryPSLPSL HEPA: How what when whyFor the PSL HEPA, we wanted it to remain
at full speed during the vent, when anyone
is working on the PSL, or when there is a
  
  16965   Thu Jun 30 18:06:22 2022 PacoUpdateALSOptimum ALS recovery - part I[Paco]

In the morning I took some time
to align the AUX beams in the XEND table.
 als_ool_06_2022.png 
  16964   Thu Jun 30 17:19:55 2022 DeekshaSummaryElectronicsMeasured Transfer Functions of the Control Loop, Servo (OLTF); got Vectfit working [Cici, Deeksha]

We were able to greatly improve
the quality of our readings by changing the
 TFSR785_29-06-2022_114042.pdfTFSR785_29-06-2022_114650.pdfTF_OLG_vectfit.png 
  16963   Wed Jun 29 18:53:38 2022 ranaUpdateElectronicsElectronics noisethis is just the CDS error signal, but
is not the electronics noise. You have to
go into the lab and measure the noise at
  
  16962   Wed Jun 29 14:28:06 2022 PacoSummaryALSALS beat allan deviation (XARM)I guess it didn't make sense since
f_beat can be arbitrarily moved, but the
beat is taken around the PSL freq ~ 281.73
 frac_adev_xbeat.pdf 
  16961   Tue Jun 28 23:10:34 2022 YehonathanUpdateBHDMeasurement of AS55 demod board conversion factor{Yuta, Yehonathan}

We measured the AS55 demod board
conversion from the amplitude of a 55MHz
  
  16960   Tue Jun 28 22:27:11 2022 YehonathanUpdateBHDMeasurement of input and output electronics noise{Yuta, Yehonathan}

For MICH noise budgeting we measure
the input electronics noise which includes
 input_noise_spectrum.pdfoutput_noise_spectrum.pdf 
  16959   Tue Jun 28 18:53:16 2022 ranaSummaryALSALS beat allan deviation (XARM)what's the reasoning behind using df/f_beat
instead of df/f_laser ?

  
  16958   Tue Jun 28 18:19:09 2022 TomislavUpdateElectronicsElectronics noiseI measured electronics noise of WFSs and
QPD (of the WFS/QPD, whitening, ADC...) by
closing PSL and measuring the error signal.
 electronics_noise_spectra.pngerror_signal.png 
  16957   Tue Jun 28 17:07:47 2022 AnchalUpdateCalibrationAdded Beatnote channels in demodulation of c1calI added today demodulation of C1:LSC-BEATX/Y_FINE_I/Q
in the c1cal demodulation where different
degrees of freedom can be dithered. For McCal
  
  16956   Tue Jun 28 16:59:35 2022 PacoSummaryALSALS beat allan deviation (XARM)[Paco]

I took ~ 7 minutes of XALS beatnote
data with the XAUX laser locked to the XARM
 xbeat_1340469968.pdffrac_avar_xbeat.pdf 
  16955   Tue Jun 28 16:26:58 2022 CiciSummaryGeneralVector fitting open loop transfer function/Audio cancellation of optical table enclosure[Deeksha, Cici]

We attempted to use vectfit to
fit our earlier transfer function data, and
 vectfit_firstattempt.pngTFSR785_28-06-2022_161937.pdfenclosure_open.MP4enclosure_closed.MP4 
  16954   Tue Jun 28 14:24:23 2022 yutaUpdateBHDBHD DC PD signals now also sent to c1lsc to circumvent IPC error[JC, Yuta]

To circumvent IPC error sending
BHD DC PD signals from c1sus2 to c1lsc, DB9
 C1LSC.JPGC1SUS2.JPGScreenshot_2022-06-28_16-03-16_BHDDCPDcopied.png 
  16953   Tue Jun 28 09:03:58 2022 JCUpdateGeneralOrganizing and CleaningThe plan for
the tools in 40m

As of right now, there are 4 tool
  
  16952   Mon Jun 27 18:54:27 2022 yutaUpdateLSCModulation depths measurement using Yarm cavity scan[Yehonathan, Yuta]
EDITED
by YM on 22:11 June 27, 2022 to correct for
 YarmModIndex.png 
  16951   Mon Jun 27 13:39:40 2022 DeekshaUpdateElectronicsSetting up the MokuLab[Cici, Deeksha]

On Friday Cici and I set up the
Mokulab to take readings of our loop. The
 WhatsApp_Image_2022-06-24_at_5.21.28_PM.jpeg 
  16950   Mon Jun 27 13:25:50 2022 CiciUpdateGeneralCharacterizing the Transfer Loop[Deeksha, Cici]

We first took data of a simple
low pass filter, and attempted to perform
 TF_measurement_b.pngtransfer_function_mag_fit.pngtransfer_function_phase_fit.pngcontrol_flow.png 
  16949   Mon Jun 27 12:32:45 2022 yutaUpdateIOOWFS issues fixed    
  16948   Sat Jun 25 22:18:41 2022 TomislavUpdateASCSimulation and reality comparisonsIn the attachment please find plots comparing
controller output, local damping output,
and error signals.
 sens_output_comparison_23_6_new.pngcontr_out_comparison_23_6_new.pnglocal_damp_out_comp_23_6_new.png 
  16947   Sat Jun 25 20:23:59 2022 KojiUpdateIOOWFS issuesI could run the WFS servo (6dofs) for more
than 15min by flipping the sign for the MC2
Pit and WFS1 Yaw. (See attachments)
 Screen_Shot_2022-06-25_at_20.23.21.pngScreen_Shot_2022-06-25_at_20.29.24.png 
  16946   Sat Jun 25 14:29:48 2022 AnchalUpdateIOOWFS issuesThis issue is very weird and still unresolved.
Without WFS loops, we'll have to realign
IMC often and we might loose IMC alignment
  
  16945   Fri Jun 24 17:16:59 2022 PacoUpdateALSXAUX cable in control room[JC, Paco]

We took the long BNC cable that
ran from ETMX to ETMY and ran it from ETMX
  
  16944   Fri Jun 24 13:29:37 2022 YehonathanUpdateGeneralOSEMs from KAGRAThe box was given to Juan Gamez (SURF)




  
  16943   Fri Jun 24 12:13:16 2022 JCUpdateIOOWFS issues[Yuta, JC]

It seems that early this morning
MC got very misaligned. Yuta was able to
 WFS.png 
  16942   Thu Jun 23 15:05:01 2022 Water MonitorUpdateUpgradeWater Bottle Refill22:05:02 UTC Jordan refilled his water
bottle at the water dispenser in the control
room.
  
  16941   Wed Jun 22 19:41:13 2022 KojiUpdateLSCDaily alignment work; POY trouble solvedBefore the final measurement of the DC
values for the transmissions, I aligned the
PMC. This made the PMC trans increased from
  
  16940   Wed Jun 22 18:55:31 2022 yutaUpdateLSCDaily alignment work; POY trouble solved[Koji, Yuta]

I found that Yarm cannot be locked
 Screenshot_2022-06-22_17-17-42_XYaligned.pngScreenshot_2022-06-22_18-58-26_Transmission.png 
  16939   Wed Jun 22 17:04:06 2022 DeekshaSummaryElectronicsCharacterising the AUX control loop[Cici, Deekha]

Setup loop to measure transfer
function of control loop - the aim is
 after.jpegbefore.jpegfreq_response.png 
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