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IDup Date Author Type Category Subject Text Attachments
  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 
  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 
  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 
  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
  
  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 
  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 
  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 
  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
  
  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 
  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 ?

  
  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 
  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
  
  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 
  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
  
  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 
  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 
  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
  
  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
  
  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.
  
  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 
  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 
  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: 
  
  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 
  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 
  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
  
  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 
  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 
  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
  
  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 
  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
  
  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
  
  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
  
  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 
  16985   Mon Jul 11 15:26:12 2022 JCHowToVACStartup after Power Outage[Koji, Jc]

Koji and I began starting that
Vacuum system up.
  
  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
  
  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 
  16988   Mon Jul 11 19:29:23 2022 PacoSummaryGeneralFinalizing recovery -- timing issues, cds, MC1[Yuta, Koji, Paco]

Restarting
CDS

We were having
  
  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
  
  16990   Tue Jul 12 09:25:09 2022 ranaUpdateIOOIMC WFSMC WFS
Demod board needs some attention.
  
  16991   Tue Jul 12 13:59:12 2022 ranaSummaryComputersprocess monitoring: MonitI've installed Monit
on megatron and nodus just now, and will
set it up to monitor some of our common processes.
  
  16992   Tue Jul 12 14:56:17 2022 TomislavSummaryElectronicsElectronics noise measurements[Paco, Tomislav]

We measured the electronics noise
of the demodulation board, whitening board,
 23x 
  16993   Tue Jul 12 18:35:31 2022 Cici HannaSummaryGeneralFinding Zeros/Poles With VectfitAm still working on using vectfit to find
my zeros/poles of a transfer function - now
have a more specific project in mind, which
  
  16994   Tue Jul 12 19:46:54 2022 PacoSummaryALSHow (not) to take NPRO PZT transfer function[Paco, Deeksha, rana]

Quick elog for this evening:


Rana disabled MC servo
  
  16995   Wed Jul 13 07:16:48 2022 JCUpdateElectronicsChecking Sorensen Power Supplies[JC]

I went around 40m picking up any
Sorensens that were laying around to test
 658C5D39-11BD-4EE3-90E2-34CBBC1DBD3C.jpeg5328312A-7918-44CC-82B7-54B57840A336.jpeg 
  16996   Wed Jul 13 10:54:39 2022 YehonathanUpdateBHDMICH AS55 noise budgetI fixed some mistakes in the budget:

1. The BS pendulum resonance was
corrected from 0.8Hz to 1Hz
 BS_MICH_ACtuation_Calibration.pdfMICH_AS55_Model_Measurement_Comparison.pdfMICH_AS55_Noise_Budget.pdf 
  16997   Wed Jul 13 12:49:25 2022 PacoSummarySUSSUS frozen[Paco, JC, Yuta]

This morning, while investigating
the source of a burning smell, we turned
  
  16998   Wed Jul 13 13:26:44 2022 ranaSummaryElectronicsElectronics noise measurementsas I said to you yesterday, I
don't think image 2a shows the output
of the demod board. The output
  
  16999   Wed Jul 13 13:30:48 2022 YehonathanUpdateBHDadd Laser RIN to MICH budgetthe main laser noise coupling for a Michelson
is because of the RIN, not the frequency
noise. You can measure the RIN, in MC trans
  
  17000   Wed Jul 13 17:30:19 2022 KojiUpdateCDSToo huge script_archiveI wanted to check the script archive to
see some old settings. I found that the script archive
  
  17001   Wed Jul 13 18:58:17 2022 KojiUpdateIOOIMC suspecionThis is just my intuition but the IMC servo
seems not so optimized. I can increase the
servo gain by 6~10dB easily. And I couldn't
  
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