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ID Date Author Type Categoryup Subject Text Attachments
  13380   Fri Oct 13 12:26:12 2017 gautamUpdateLSCAS55Q Dark NoiseAttachment #1 -
Measured / modelled noises for AS55 demod
board. I've plotted quadrature sum of
 AS55_DemodNoises.pdf 
  13382   Mon Oct 16 16:01:04 2017 gautamUpdateLSCAS55Q Dark NoiseKoji suggested looking at the output of
the AS55 demod board on a fast oscilloscope
to look for differences in the two channel
 DemodBoardwOscope.pdfDemodBoardwOscope_ASD.pdf 
  13383   Tue Oct 17 17:53:25 2017 jamieSummaryLSCprep for tests of Gabriele's neural network cavity length reconstructionI've been preparing for testing Gabriele's
deep
neural network MICH/PRCL reconstruction.
 c1dnn.png 
  13384   Tue Oct 17 19:31:53 2017 gautamUpdateLSCAS55Q Dark Noise[Koji, gautam]

We took a closer look at the AS55
demod board today. The procedure was to just
 D040179_TFs.pdfAS55_DemodNoises.pdf 
  13390   Wed Oct 18 12:14:08 2017 jamieSummaryLSCprep for tests of Gabriele's neural network cavity length reconstruction


  
  13395   Thu Oct 19 15:42:03 2017 jamieSummaryLSCMICH/PRCL reconstruction neural network running on c1lscGabriele's
PRCL/MICH reconstruction neural network is
now running on c1lsc. 
 NN.pngC1DNN_GDS.pngC1DNN_CPU_METER.png 
  13400   Tue Oct 24 20:14:21 2017 jamieSummaryLSCfurther testing of c1dnn integration; plugged in to DAQIn order to try to isolate CPU6 for the
c1dnn neural network reconstruction model,
I set the CPUAffinity in /etc/systemd/system.conf
 NN.pngc1dnn_out.png 
  13401   Wed Oct 25 09:32:14 2017 GabrieleSummaryLSCfurther testing of c1dnn integration; plugged in to DAQ


  
  13411   Mon Nov 6 18:22:48 2017 jamieSummaryLSCcurrent procedure for running c1dnn codeThis is the current procedure to start
the c1dnn model:

  
  13412   Tue Nov 7 17:45:05 2017 gautamUpdateLSCDRMI Nosie Budget v3.1Some days ago, I had tried to measure the
SRCL->MICH and PRCL->MICH cross couplings
using broadband noise injected between 120-180
 SRCL_MICH_whitenoise_tf.pdfPRCL_MICH_whitenoise_tf.pdfMICH_aux.pdfC1NB_disp_40m_MICH_NB_2017-10-08.pdf 
  13413   Tue Nov 7 22:56:21 2017 gautamUpdateLSCDRMI locking recoveredI hadn't re-locked the DRMI after the
work on the AS55 demod board. Tonight, I
was able to recover the DRMI locking with
 DRMI_7Nov20178.png 
  13414   Wed Nov 8 00:28:16 2017 gautamUpdateLSCLaser intensity coupling measurement attemptI tried measuring the coupling of PSL intensity
noise by driving some broadband noise bandpassed
between 80-300Hz using the spare DAC channel
 PSL_RIN.pdf 
  13415   Wed Nov 8 09:37:45 2017 ranaUpdateLSCDRMI Nosie Budget v3.1why no oplev trace in the NB ?




  
  13416   Wed Nov 8 09:59:12 2017 gautamUpdateLSCDRMI Nosie Budget v3.1The Oplev trace is missing for now, as
I have not re-measured the A2L coupling since
modifying the Oplev loop shape (specifically
  
  13421   Thu Nov 9 10:51:37 2017 gautamSummaryLSCcurrent procedure for compiling and installing c1dnn codeJamie pointed out that the compile and
install instructions are different for c1dnn:

  
  13428   Wed Nov 15 01:37:07 2017 gautamUpdateLSCDRMI low freq. nosie improvedPianosa
just crashed and ate my elog, along with
 C1NB_disp_40m_MICH_NB_2017-11-15.pdfOL_A2L_couplings.pdf 
  13431   Thu Nov 16 00:53:26 2017 gautamUpdateLSCDRMI noise sub-budgetsI've incorporated the functionality
to generate sub-budgets for the various grouped
traces in the NBs (e.g. the "A2L"
 C1NB_a2l_40m_MICH_NB_2017-11-15.pdfC1NB_aux_40m_MICH_NB_2017-11-15.pdf 
  13907   Thu May 31 23:12:17 2018 gautamUpdateLSCDRMI locking attemptSummary:

I wanted to recover the DRMI locking.
Among other things, Jon mentioned that his
 REFL55_whtCheck.pdf 
  13908   Fri Jun 1 01:22:50 2018 gautamUpdateLSCDRMI locking restoredAs it happened last time, the problem apparently
fixed itself - somehow the act of me disconnecting
the cables and reconnecting them seems to
 DRMI_20180531.png 
  13920   Wed Jun 6 14:36:15 2018 gautamUpdateLSCTRX clippingFor some time now, I've been puzzled
by the unreliability of the ASS_X dither
alignment servo. Leaving the servo on, TRX
  
  13927   Thu Jun 7 16:15:03 2018 gautamUpdateLSCTRX clippingI opted for the quickest fix - I raised
the height of the offending steering mirror
using a 0.25" shim. In the long term,
  
  13933   Fri Jun 8 01:58:56 2018 gautamUpdateLSCDRMI locking attempt againGiven the various changes to the IFO config
since last Thursday when I was last able
to lock the DRMI, I wanted to try once again
  
  13948   Tue Jun 12 03:22:25 2018 gautamUpdateLSCAUX laser shutteredI worked a bit on recovering the DRMI locking
again tonight. I decided to shutter the AUX
laser on the PSL table at least until I figured
  
  13952   Wed Jun 13 01:02:40 2018 gautamUpdateLSCReliable and repeatable 1f DRMI locking[koji,
gautam]

With Koji's help, I got repeatable
  
  13953   Wed Jun 13 11:17:40 2018 gautamUpdateLSCPRCL loop shape anomalyAttachment
#1 shows the measured
 PRCL_12Jun2018_WeirdShape.pdf 
  13959   Thu Jun 14 00:40:42 2018 gautamUpdateLSCPRCL loop shape anomalydon't use IN_1/IN_2: recall pizza meeting
from a few weeks back: use IN1/EXC + Al-Gebra

  
  13966   Thu Jun 14 18:09:24 2018 gautamUpdateLSCReliable and repeatable 1f DRMI lockingI finally analyzed the sensing measurement
I ran on Tuesday evening. Sensing responses
for the DRMI DOFs seems consistent with what
 DRMI1f_June14.pdf 
  13969   Fri Jun 15 00:53:21 2018 gautamUpdateLSCCalibrated MICH spectrumUsing the numbers from the sensing measurement,
I calibrated the measured in-loop MICH spectrum
from Tuesday night into free-running displacement
 C1NB_disp_40m_MICH_NB_2018-06-14.pdf 
  14152   Fri Aug 10 01:10:56 2018 gautamUpdateLSCSome vertex locking restoredFor
the first time after the whirlwind vent,
 PRMIcarrier.png 
  14160   Tue Aug 14 00:27:55 2018 gautamUpdateLSCLocking prepIn preparation for attempting some DRMI
locking, I did the following:


Slow machine reboots for
  
  14162   Tue Aug 14 02:01:12 2018 gautamUpdateLSCDRMI locking - partial successAfter tweaking the AS55 demod phase, SRM
alignment, triggering settings, I got a few
brief
 DRMI.png 
  14235   Sun Oct 7 16:51:03 2018 gautamConfigurationLSCYarm triggering changedTo facilitate Yuki's alignment of the
EY green beam into the Yarm cavity, I have changed
  
  14236   Sun Oct 7 22:30:42 2018 yukiConfigurationLSCYarm Green locking was recoveredI finished installation of optics in the
Y-end and recovered green locking. Current
ALS-TRY_OUTPUT is about 0.25, which is lower
 Pic_NewLayout1007.jpgYendGreenModeMatching.zip 
  14240   Tue Oct 9 23:03:43 2018 yukiConfigurationLSCYarm Green locking was recovered[ Yuki, Gautam, Steve ]

To align the green beam in Y-end
these hardware were installed:
 Pic_1Y4.jpgPic_PZTcable.jpg 
  14241   Wed Oct 10 12:38:27 2018 yukiConfigurationLSCAll hardware was installedI connected DAC - AIboard - PZTdriver -
PZT mirrors and made sure the PZT mirrors
were moving when changing the signal
  
  14285   Wed Nov 7 23:07:11 2018 gautamUpdateLSCDRMI locking recoveredI had some
success today. I hope that the tweaks I made
will allow working with the DRMI during the
 Screenshot_from_2018-11-07_23-05-58.pngSRCL2MICH_crosscpl.pdfPRCangularCoh_rot.pdf 
  14288   Sat Nov 10 17:32:33 2018 gautamUpdateLSCNulling MICH->PRCL and MICH->SRCLWith the DRMI locked, I drove a line in
MICH using the sensing matrix infrastructure.
Then I looked at the error points of MICH,
 sensMat_2018-11-10.pdf 
  14292   Tue Nov 13 18:09:24 2018 gautamUpdateLSCInvestigation of SRCL-->MICH couplingSummary:

I've been looking into the
cross-coupling from the SRCL loop control
 TF_sweptSineMeas.pdfdigitalDemod.pdfdigitalDemod_hist.pdfDRMI_LSCspectrogram.pdf 
  14298   Fri Nov 16 00:47:43 2018 gautamUpdateLSCMore DRMI characterizationSummary:


More DRMI characterization
was done.
I was working on trying
 PRCff.pdfDRMI_withPRCff.png 
  14313   Wed Nov 21 09:59:26 2018 gautamUpdateLSCLSC feedforward block diagramAttachment
#1 is a block diagram depicting
the pathway by which the vertex DOF control
 IMG_7173.JPG 
  14326   Fri Nov 30 19:37:47 2018 gautamUpdateLSCLSC feedforward block diagramI wanted to set up an RTCDS model to understand
this problem better. Attachment #1 is the
simulink diagram of the signal flow. The
 LSC_FF_tester.pngScreenshot_from_2018-11-30_19-41-07.pngScreenshot_from_2018-12-10_15-31-23.pngSimLSC.png 
  14339   Mon Dec 10 15:53:16 2018 gautamUpdateLSCSwept-sine measurement with DTTDisclaimer:
This is almost certainly some user error
 SimTF.pdf 
  14445   Fri Feb 8 20:48:52 2019 gautamUpdateLSCIFO recoverySeveral housekeeping tasks were carried
out today in preparation for the Y-arm loss
measurement.
 IMG_7307.JPG 
  14446   Mon Feb 11 15:41:49 2019 gautamUpdateLSCTRY 60 Hz solved - but clipping persistsRich came by the 40m to photocopy some
pages from Hobbs, and saw me working on the
60 Hz hunting. As I suspected, the problem
  
  14447   Mon Feb 11 16:38:34 2019 gautamUpdateLSCETMY OL calibration updatedSince we changed the HeNe, I updated the
calibration factors, and accepted the changes
in the SDF.
 OL_calib_ETMY_PERROR.pdfOL_calib_ETMY_YERROR.pdf 
  14459   Fri Feb 15 18:42:57 2019 gautamUpdateLSCTRY 60 Hz solved A more permanent fix than a crocodile clip was
implemented. Should probably look to do this
for the X end unit as well.
 IMG_7323.JPG 
  14704   Wed Jun 26 21:01:26 2019 gautamUpdateLSCPOX and POY lockingNow that the IMC is remaining locked for
extended periods of time, the next problem
to attack is the ASS dither alignment system.
  
  14705   Thu Jun 27 14:28:12 2019 gautamUpdateLSCPOX and POY lockingAfter a more systematic alignment effort,
I was able to get the spots better centered
on the optics (judged by eye from the analog
  
  14720   Tue Jul 2 17:34:54 2019 gautamUpdateLSCIrides opened up on EY tableIn preparation for the ASS debugging, I decided   
  14738   Tue Jul 9 18:06:05 2019 gautamUpdateLSCY-arm ASS in a workable stateThe Y-arm ASS was tuned to be in a workable
state. Basically, I followed Koji's recipe.
 ditherFreqs.pdftransRenorm.png 
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