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ID Date Author Type Category Subject Text Attachments
  15139   Wed Jan 22 11:22:39 2020 gautamUpdatePSLPMC modulation depth measurementSummary:

I estimate the PMC servo modulation
depth to be approximately 
 modDepth.pdf 
  15138   Wed Jan 22 11:00:21 2020 gautamUpdatePSLPMC REFL ghost beamI looked into this a little more today.


The steering optic used
to route PMC REFL to the RFPD is in fact
  
  15135   Mon Jan 20 20:20:36 2020 gautamUpdatePSLPMC servo checkoutSummary:

The PDH discriminant of the PMC
servo was measured to be ~
 PMCsweep.pdfOLTFmeas.pdf 
  15134   Mon Jan 20 15:11:20 2020 gautamUpdatePSLPMCT photodiode grounding issueFor a few days, I've noticed that the
PSL overview StripTool panel shows PMC transmission
and FSS RMTEMP channels with variation that
 PMCT_anomaly.pdf 
  15133   Mon Jan 20 12:16:50 2020 gautamUpdatePSLPMC input reverted to AOM zeroth order beamSummary:


The input beam to the PMC
cavity was changed back to the zeroth order
 IMG_8362.JPG 
  15132   Fri Jan 17 22:11:19 2020 YehonathanUpdatePSLRingdown measurementsI prepare for the ringdown measurement
of the PMC according to Gautam's previous
experiments.
 20200117_192455.jpg20200117_192448.jpg 
  15131   Fri Jan 17 21:56:22 2020 YehonathanUpdatePSLAOM first order beam alignmentToday I noticed that the beam reflected
from the PMC into the RFPD has a ghost (attachment)
due to reflection from the back of the high
 20200117_174841.jpg 
  15130   Fri Jan 17 18:02:21 2020 gautamUpdateALSGain blocks packaged and characterizedSummary:


The ZHL-1010+
gain blocks acquired from MiniCircuits
 photos.pdfgain.pdfnoise.pdfmeasSchem.pdfzhl1010Data.zip 
  15129   Thu Jan 16 19:32:23 2020 shrutiUpdateGeneralPLL / PM measurement of Xend NPRO PZTWith Gautam's help today the PLL managed
to be be locked for a few brief moments.
Turns out the signal power of the beat was
  
  15128   Wed Jan 15 16:54:51 2020 gautamUpdateGeneralPDA10CF removed from AS tablePer Yehonathan's request, I removed
one PDA10CF from a pickoff of REFL on the
AS table (it was being used for the mode
  
  15127   Wed Jan 15 16:08:40 2020 not gautamUpdatePSLAssembly underway for c1psl upgradeYou're right. We had the right
idea before but we got confused about this
issue. I changed all the XT1121s to XT1111
  
  15126   Wed Jan 15 15:04:31 2020 gautamUpdatePSLPMC Linewidth measurementFor the ringdowns, I suggest you replicate
the setup
I had - infrastructurally, this was quite
  
  15125   Wed Jan 15 14:10:28 2020 JonConfigurationPSLNew EPICS database for C1PSL + C1IOOSummary

I have completed the
new EPICS channel database for the c1psl
and c1ioo channels
  
  15124   Wed Jan 15 10:12:46 2020 gautamUpdatePSLAssembly underway for c1psl upgradeI don't think this is an accurate statement.
XT1111 modules have sinking digital
outputs, while XT1121 modules have sourcing digital
  
  15123   Wed Jan 15 10:04:19 2020 gautamSummaryGeneralPOX / POY locking restoredSingle arm locking using POX and POY has
been restored. After running the dither alignment
servos, the TRX/TRY levels are ~0.7. This
 singleArms.png 
  15122   Wed Jan 15 08:55:14 2020 gautamUpdateCDSYearly DAQD fixSummary:

Every new year (on Dec 31 or Jan
1), all of the realtime models will report
 DCerrors_fixed.png 
  15121   Tue Jan 14 20:17:09 2020 gautamSummaryGeneralIFO recoverySummary:

There was no light entering the
IFO. I worked on a few things to bring the
 DCerrors.png 
  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
  
  15119   Mon Jan 13 23:30:53 2020 YehonathanSummaryPSLChanges made since Gautam leftAs per Gautam's request, I list the
changes that were made since he left:

1. The AOM driver was connected
  
  15118   Mon Jan 13 16:05:18 2020 yehonathanUpdatePSLAssembly underway for c1psl upgrade{Yehonathan, Jon}

I configured the Acromag channels
according to the Slow
  
  15117   Mon Jan 13 15:47:37 2020 shrutiConfigurationComputer Scripts / Programsc1psl burt restore[Yehonathan, Jon, Shruti]

Since the PMC would not lock, we
initially burt-restored the c1psl machine
  
  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 
  15115   Fri Jan 10 14:21:19 2020 YehonathanUpdatePSLc1psl rebootPSL controls on the sitemap went blank.
Rebooted c1psl. PSL screens seem normal again.
  
  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.
  
  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
  
  15112   Mon Jan 6 16:07:12 2020 gautamUpdatePSLAssembly underway for c1psl upgradeRTFE.
Where did the spares go?

  
  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
  
  15110   Wed Jan 1 16:04:37 2020 YehonathanUpdatePSLMapping the PSL electronicsDone.




  
  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 
  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
  
  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
  
  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 
  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 
  15104   Mon Dec 23 19:30:20 2019 YehonathanUpdatePSLMapping the PSL electronicsPSL wiring spreadsheet is ready. (But the
link was stripped. Koji)

Link
  
  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 
  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
  
  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 
  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 
  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 
  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 
  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 
  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 
  15095   Wed Dec 11 22:01:24 2019 ranaConfigurationComputersMegatron: starts up gradeMegatron is now running Ubuntu 18.04
LTS.

We should probably be able to load
  
  15094   Wed Dec 11 15:29:17 2019 YehonathanUpdatePSLPMC is lockedMake sure
to measure the power drop of the beam downstream
  
  15093   Wed Dec 11 15:01:57 2019 JonSummaryPSLPMC cavity ringdown measurement[Jon, Yehonathan]

We carried out a set of cavity
ringdown measurements of the PMC. The 1/e
 IMG_0101.jpg 
  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.
  
  15091   Tue Dec 10 15:17:17 2019 YehonathanUpdatePSLPMC is locked{Jon, Yehonathan}

We burt-restored the PSL and the
PMC locked immediately.
  
  15090   Tue Dec 10 13:26:46 2019 YehonathanUpdatePSLAOM first order beam alignmentnvm the PZT can scan over many GHz.




  
  15089   Tue Dec 10 01:24:17 2019 YehonathanUpdatePSLAOM first order beam alignment 




  
  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
  
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