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  40m Log, Page 309 of 341  Not logged in ELOG logo
ID Date Author Typeup Category Subject Text Attachments
  15061   Mon Dec 2 23:01:47 2019 gautamUpdateCDSFrequent DTT crashes on pianosaI have been experiencing frequent crashes of  DTTerrorLog.tgz 
  15062   Tue Dec 3 00:03:57 2019 gautamUpdateLSCGreen ALS also shows elevated noise with high arm buildupSummary:  ALSnoiseIncrease_greenBeat.pdf 
  15063   Tue Dec 3 00:10:15 2019 KojiUpdateALSEY uPDH post mixer LPFI got confused. Why don't we see that
too-high-Q pole in the OLTF? 
  
  15064   Tue Dec 3 00:51:25 2019 gautamUpdateALSEY uPDH post mixer LPFI'm not sure - maybe it was measurement
error on my part, I will double check. Moreover,
the EX
  
  15065   Tue Dec 3 14:52:13 2019 ranaUpdateIMCQ Measurement of Test Masses

  
  15066   Tue Dec 3 18:15:42 2019 gautamUpdateALSEY uPDH post mixer LPFRana and I discussed this alogrythym a
bit today - here are some bullet points,
I'll work on preparing a notebook. We
  
  15068   Tue Dec 3 21:28:24 2019 gautamUpdateALSEY uPDH post mixer LPFHere are some loop transfer functions.
I basically followed the decomposition of
the end PDH loop as was done in the multi-color
 uPDH.pdf 
  15069   Tue Dec 3 22:41:17 2019 shrutiUpdateGeneralPLL for PM measurement I worked on the setup up for the phase
modulation measurement of the X end NPRO
PZT. A previous similar measurement can be
 PM_measurement.jpeg 
  15070   Wed Dec 4 08:54:07 2019 YehonathanUpdateIMCMirror analog shaking{Yehonathan, Gavin}

Yesterday we tried to shake ITMX
with a function generator in order to observe
  
  15071   Wed Dec 4 09:11:42 2019 YehonathanUpdateCDSReboot scriptAfter the CDSs crashed we run the rebootC1LSC.sh script.

The script is a bit annoying in
that it requires entering the CDSs' passwords
 medmScreen11.ps 
  15072   Wed Dec 4 12:13:10 2019 gautamUpdateCDSReboot scriptIt was way more annoying without a script
and took longer than the 4 minutes it does
now.
  
  15073   Wed Dec 4 19:54:27 2019 gautamUpdateLSCA look to the pastTrawling
through some past elogs, I saw that the ALS
noise increase as a function of CARM offset
 DRFPMI_2016March.pdf 
  15074   Wed Dec 4 20:32:43 2019 gautamUpdateGeneralPLL for PM measurement Were
some cables from the ALS beat setup modified?
I can't see the beat on the scope, and
  
  15075   Thu Dec 5 01:54:39 2019 gautamUpdateLSCPartial CM board path engaged
The arm powers could be stabilized
somewhat once the CM_SLOW path to MC2 was
engaged.
However, I was never
 AOengaged.pdf 
  15076   Thu Dec 5 08:44:44 2019 GavinUpdateLoss MeasurementQ Measurements of Test Masses[Yehonathan, Gavin]

Measuring POX11_Q_MON and injecting
a signal into the ITMX_UL_IN port a signal
 20191205_132158.jpg 
  15077   Thu Dec 5 14:54:15 2019 gautamUpdateGeneralSymlink to SRmeasure and AGmeasureI symlinked the SRmeasure and AGmeasure
commands to /usr/bin/ on donatella (as it
is done on pianosa) so that these scripts
  
  15078   Thu Dec 5 15:09:50 2019 gautamUpdateCDSc1oaf crashed c1lscI tried starting the c1oaf model, but got
a DQ error (I want the option of running
feedforward during locking even if the filters
 SCYerrors.pngCDSnormal.png 
  15079   Thu Dec 5 18:15:01 2019 gautamUpdateOptical LeversITM, PRM and BS Oplevs re-centeredIn preparation for locking tonight, I re-centered
the spots on the Oplev QPDs for the ITMs,
BS and PRM after locking and running the
  
  15080   Fri Dec 6 00:02:48 2019 gautamUpdateLSCWhat is the correct way to set the 3f offsets?Summary:

I made it to 0 CARM offset, PRMI
locked a bunch of times today. However, I
  
  15084   Sun Dec 8 20:27:11 2019 ranaUpdateComputersViviana upgrade to Ubuntu 16The IBM laptop at EX was running Ubuntu
14, so I allowed it to start upgrading itself
to Ubuntu16 as it desired. After it is done,
  
  15087   Mon Dec 9 19:19:04 2019 YehonathanUpdatePSLAOM first order beam alignment{Yehonathan, Rana}

In order to setup a ringdown measurement
with perfect extinction we need to align
 20191209_193112.jpg20191209_193203_HDR.jpgimageedit_2_7551928142.gifimageedit_3_5863650538.gif 
  15088   Mon Dec 9 21:22:46 2019 shrutiUpdateGeneralPLL / PM measurement of Xend NPRO PZTIn short: 

Using the
same setup as before with a LPF changed to
have a cutoff of 5 MHz, the PLL was implemented
  
  15089   Tue Dec 10 01:24:17 2019 YehonathanUpdatePSLAOM first order beam alignment 




  
  15090   Tue Dec 10 13:26:46 2019 YehonathanUpdatePSLAOM first order beam alignmentnvm the PZT can scan over many GHz.




  
  15091   Tue Dec 10 15:17:17 2019 YehonathanUpdatePSLPMC is locked{Jon, Yehonathan}

We burt-restored the PSL and the
PMC locked immediately.
  
  15092   Tue Dec 10 18:27:22 2019 YehonathanUpdatePSLPMC is locked{Yehonathan, Jon}

We are able to lock the PMC on
the TEM00 mode of the deflected beam.
  
  15094   Wed Dec 11 15:29:17 2019 YehonathanUpdatePSLPMC is lockedMake sure
to measure the power drop of the beam downstream
  
  15096   Thu Dec 12 19:20:43 2019 YehonathanUpdatePSLPMC cavity ringdown measurement{Yehonathan, Rana, Jon}

To check whether we laser is being
shut fast enough for the ringdown measurement
 IMG_0105.jpegTEK00001.PNG20191212_151642.jpg 
  15097   Fri Dec 13 12:28:43 2019 YehonathanUpdatePSLPMC cavity ringdown measurementI grab the data we recorded yesterday from
the scope and plot it in normalized units (remove
noise level and divide by maximum). See attachment.
 Ringdown_InitialProcess.pdf 
  15098   Mon Dec 16 18:19:42 2019 shrutiUpdatePSLPMC cavity ringdown measurement : beat-note disruptionI have removed the PD55 + ND filter attached
to it (see Attachment) and placed it
next to the oscilloscope, after disconnecting
 IMG_0040.jpg 
  15099   Tue Dec 17 00:23:28 2019 YehonathanUpdatePSLMapping the PSL electronicsI added to the PSL wiring list the
ioo channels and the laser shutter (See attached
pdf for an updated list).
 PSL_Wirings_-_Sheet1_(2).pdf 
  15100   Tue Dec 17 18:05:06 2019 YehonathanUpdatePSLMapping the PSL electronicsUpdated the channel list (Attached):

1. Removed the MC steering mirror
PZT channels
 PSL_Wirings_-_Sheet1_(3).pdf 
  15101   Tue Dec 17 20:08:09 2019 shrutiUpdateGeneralPLL / PM measurement of Xend NPRO PZT1. Some calculations

For a
Unity Gain Frequency (UGF) of 1 kHz, assumed
PZT response 
 20191217.png 
  15102   Tue Dec 17 20:45:30 2019 ranaUpdatePSLPMC cavity ringdown measurementidk - I'm recently worried about the
'thermal self locking' issue we discussed.
I think you should try to measure the linewidth
  
  15103   Fri Dec 20 18:33:21 2019 YehonathanUpdatePSLMapping the PSL electronicsFinal (hopefully) PSL channel list is attached
with allocated Acromag channels. Wiring spreadsheet
coming soon.
 PSL_Wirings_-_Channel_List.pdf 
  15104   Mon Dec 23 19:30:20 2019 YehonathanUpdatePSLMapping the PSL electronicsPSL wiring spreadsheet is ready. (But the
link was stripped. Koji)

Link
  
  15105   Fri Dec 27 15:01:02 2019 YehonathanUpdatePSLPMC cavity ringdown measurementI measured PMC ringdowns for several input
powers. I change the input power by changing
the DC voltage to the AOM.
 PDAOMResponse.pdfPMCTransmission.pdfRingdownsAndRefs.pdfTwoExponentialFitAOM0.3V.pdf 
  15106   Fri Dec 27 16:26:11 2019 YehonathanUpdatePSLPMC Linewidth measurementI try to measure the linewidth of the PMC
by ramping the PMC PZT. 

I do it by connecting a triangular
 PMCTransmissionSpectra.pdf 
  15107   Tue Dec 31 03:03:02 2019 gautamUpdatePSLPMC cavity ringdown measurementWhen I was looking at this, the AOM shutdown
time was measured to be ~120 ns, and while
I wasn't able to do a ringdown measurement
  
  15108   Wed Jan 1 04:53:11 2020 gautamUpdatePSLMapping the PSL electronicsFor the IMC servo board, it'd be easiest
to copy the wiring scheme for the BIO bits
as is configured for the CM board (i.e. copy
  
  15109   Wed Jan 1 14:14:00 2020 YehonathanUpdatePSLPMC Linewidth measurementTurns out the 35MHz sidebands are way too
weak to resolve from the resonance when doing
a PZT scan.
 150MHzSideBandCreation.pdfLinewidthMeasurment.pdf 
  15110   Wed Jan 1 16:04:37 2020 YehonathanUpdatePSLMapping the PSL electronicsDone.




  
  15111   Mon Jan 6 15:36:55 2020 JonUpdatePSLAssembly underway for c1psl upgrade[Jon, Yehonathan]

We've begun assembling the
new c1psl Acromag chassis based on Yehonathan's
  
  15112   Mon Jan 6 16:07:12 2020 gautamUpdatePSLAssembly underway for c1psl upgradeRTFE.
Where did the spares go?

  
  15113   Mon Jan 6 19:05:09 2020 not gautamUpdatePSLAssembly underway for c1psl upgradeI found them, thanks. After c1psl, there
are 4 2GB DIMM cards and 1 SSD left. I moved
them into the storage bins with all the other
  
  15114   Tue Jan 7 18:51:51 2020 JonUpdatePSLNew c1psl server assembledI've assembled a new SuperMicro rackmount
machine to replace c1psl. It is currently
set up on the electronics bench.
  
  15115   Fri Jan 10 14:21:19 2020 YehonathanUpdatePSLc1psl rebootPSL controls on the sitemap went blank.
Rebooted c1psl. PSL screens seem normal again.
  
  15116   Fri Jan 10 19:48:46 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I finished pre-wiring the PSL chassis.
I mounted the Acromags on the DIN rails and
 20200110_194429.jpg20200110_194516_HDR.jpg 
  15118   Mon Jan 13 16:05:18 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I configured the Acromag channels
according to the Slow
  
  15120   Tue Jan 14 17:16:43 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I isolated a BIO Acromag completely
from the chassis and powered it up. The inverted
  
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