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  40m Log, Page 323 of 327  Not logged in ELOG logo
ID Date Author Typedown Category Subject Text Attachments
  13681   Tue Mar 13 20:03:16 2018 johannesConfigurationComputersc1auxex replacementI assembled the rack-mount server that
will long-term replace c1auxex, so we can
return the borrowed unit to Larry.
 IMG_20180313_105154890.jpgIMG_20180313_133031002.jpg 
  13682   Wed Mar 14 23:58:30 2018 johannesConfigurationComputersc1auxex replacementI replaced the borrowed server with the
permanent one today. Before Removing the
current server, Before, I performed several
  
  13687   Mon Mar 19 14:39:09 2018 johannesConfigurationComputersc1auxex replacement[gautam, johannes]

The temperature control output
channel for the XEND seismometer wasn't
  
  13742   Mon Apr 9 23:28:49 2018 johannesConfigurationDAQc1psl channel listI made a list of all the physical c1psl
channels to get a better idea for how many
acromags we need to replace it eventually.
  
  13761   Wed Apr 18 17:15:35 2018 ranaConfigurationComputersNODUS: no xmgrace for dataviewerTurns
out, there is no RPM for XmGrace on Scientific
Linux 7. Since this is the graphic output
  
  13764   Wed Apr 18 22:46:23 2018 johannesConfigurationGeneralAS port laser injectionUsing Gautam's Finesse file and the
cad files for the 40m optical setup I propagated
the arm mode out of the AS port. For the
 ASpath.svg.pngpower_out_fluctuation_DC.pngpower_out_fluctuation_AC_zoom.png 
  13766   Thu Apr 19 01:04:00 2018 gautamConfigurationGeneralAS port laser injectionFor the arm cavity ringdowns, I guess we
don't need AS55/AS110 (although I think
the camera will still be useful for alignment).
  
  13772   Thu Apr 19 20:41:09 2018 KojiConfigurationGeneralAux Laser LD dying? (AS port laser injection)I suspect
that the LD of the aux laser is dying.
- The max power we obtain from this
 Aux_laser_adj_Pout.pdfAux_laser_RIN.pdf 
  13781   Tue Apr 24 08:36:47 2018 johannesConfigurationGeneralAux Laser LD dying? (AS port laser injection)In September
2017 I measured ~150mW output power,
which was already kind of low. What are the
  
  13784   Tue Apr 24 11:31:59 2018 gautamConfigurationALSProposed changes to EX fiber couplingMotivation:
I want to make another measurement of the
 EX_fiber_MM.pdfEX_fiber_changes.png 
  13786   Tue Apr 24 18:54:15 2018 gautamConfigurationALSProposed changes to EX fiber couplingI started working on the EX table. Work
is ongoing so I will finish this up later
in the evening, but in case anyone is wondering
  
  13789   Wed Apr 25 19:09:37 2018 gautamConfigurationALSNew look EX Fiber couplingSummary:

I implemented most of the things
outlined in my previous elog.
 EX_fiber_MM.pdfIMG_6977.JPGIMG_6972.JPGIMG_6974.JPGIMG_6976.JPG 
  13791   Thu Apr 26 11:24:50 2018 gautamConfigurationALSNew look EX Fiber coupling - pol stabilityHere is a first look at the overnight stability.
For the temperature, I used the calibration
I found in the old psl database file, seems
 polStab.pdf 
  13792   Thu Apr 26 18:58:21 2018 BruceConfigurationALSNew look EX Fiber coupling - pol stability    
  13796   Fri Apr 27 01:36:02 2018 gautamConfigurationALSIR ALS noise performanceSummary:

My goal was to do some further
characterization of the IR ALS system tonight.
 2018_04_BeatMouth_POX.pdf2018_04_BeatMouth.pdfALSSpecgram.pdfALS_ASD.pdfALSstab.pdf 
  13802   Tue May 1 08:04:13 2018 Jon RichardsonConfigurationElectronicsPSL-Aux. Laser Phase-Locked Loop[Jon, Gautam, Johannes]

Summary: In
support of making a proof-of-concept RF measurement
 IMG_2553.jpgIMG_2551.jpgIMG_2552.jpgsrc_gouy_phase_v3.pdf 
  13807   Wed May 2 21:39:33 2018 gautamConfigurationALSIR ALS for EYThe new K6XS mounts I ordered have arrived.
I want to install one of them at the Y-end.
I can't find a picture of the current
  
  13810   Thu May 3 10:40:43 2018 johannesConfigurationGeneralAS port laser injectionInstead of trying to couple the fiber output
into the interferometer, I'm doing the
reverse and maximize the amount of interferometer
 mm_solution_AStable.pngAStable_beampath.pdf 
  13811   Thu May 3 12:10:12 2018 gautamConfigurationGeneralAS port laser injectionI think we need AS55 for locking the configuration
Jon suggested - AS55 I and Q were used to
lock the SRMI previously, and so I'd
  
  13813   Thu May 3 20:29:39 2018 gautamConfigurationElectronicsPSL-Aux. Laser Phase-Locked LoopSome notes about the setup and work at
the PSL table today, Jon can add to / correct
me.
  
  13814   Fri May 4 13:24:56 2018 Jon RichardsonConfigurationElectronicsAUX-PSL PLL Implementation & CharacterizationAttached are final details of the phase-locked
loop (PLL) implementation we'll
use for slaving the AUX 700 mW NPRO laser
 PLL_Schematic.pdfPLL_AUX-PSL_40m.pdf 
  13816   Fri May 4 19:06:28 2018 ranaConfigurationElectronicsAUX-PSL PLL Implementation & Characterizationthis doesn't make much sense to me;
the phase to frequency conversion (mixer-demod
to PZT ) should give us a 1/f loop as Johannes
  
  13817   Fri May 4 21:17:57 2018 gautamConfigurationALSBeathMouth pulled out of PSL tableI have been puzzled about the beat note
level we get out of the BeatMouth for some
time.
  
  13824   Tue May 8 00:40:51 2018 gautamConfigurationALSBeathMouth pulled out of PSL tableSummary:

I did some more BeatMouth characterization.
My primary objective was to do a power budget.
 IMG_6986.JPGIMG_6987.JPG 
  13845   Tue May 15 20:51:27 2018 gautamConfigurationElectronicsMaking PLL setup more permanent[jon, steve, gautam]

Some points which Jon will elaborate
  
  13848   Wed May 16 18:52:50 2018 gautamConfigurationElectronicsPLL mysteries solved[Koji,
Gautam]

Summary:
 PLLanalysis.pdfPZTcal.pdfSR560_funkiness.pdf 
  13858   Thu May 17 13:51:35 2018 Jon RichardsonConfigurationElectronicsDocumentation & Schematics for AUX-PSL PLL[Jon, Gautam]

Attached is supporting documentation
for the AUX-PSL PLL electronics installed
  
  13863   Fri May 18 14:18:03 2018 gautamConfigurationElectronicsBasic MEDM Control Screen setupI setup a basic MEDM screen for remote
control of the PLL.

The Slow control voltage slider
 AUX_PLL_CTRL.png 
  13867   Fri May 18 19:59:55 2018 Jon RichardsonConfigurationElectronicsAUX-PSL PLL Characterization MeasurementsBelow is analysis of measurements
I had taken of the AUX-PSL PLL using an SR560
as the servo controller (1 Hz single-pole
 SR560_OL.pdfSR560_CL.pdf 
  13873   Mon May 21 15:34:19 2018 gautamConfigurationElectronicsChannel hijacking historySince we've been hijacking channels
like there is no tomorrow for the AUX-PLL
setup, I'm documenting the channel names
  
  13876   Tue May 22 10:14:39 2018 Jon RichardsonConfigurationElectronicsDocumentation & Schematics for AUX-PSL PLL 




 Schematic_PLL.pdf 
  13881   Wed May 23 00:45:18 2018 johannesConfigurationGeneralAS port laser injectionI was planning to set up the additions
to the AS table that are outlined in Attachment
#1. Unfortunately the beam is too large for
 faraday_location.pdf 
  13886   Thu May 24 13:06:17 2018 gautamConfigurationALSDFD noisesSummary:


The DFD noise floor is
~0.5Hz/rtHz
 DFDcalib.pdfDFD_NB.pdf 
  13889   Thu May 24 19:41:28 2018 gautamConfigurationALSBeathMouth reinstalled on PSL tableSummary:


DC light power incident
on beat PD is 
  
  13890   Thu May 24 20:31:03 2018 gautamConfigurationALSDFD noisesA
couple of months ago, I took 21 measurements
of the delay line transfer function. As shown
 TF_X_mag.pdfTF_X_phase.pdf 
  13891   Fri May 25 13:06:33 2018 Jon RichardsonConfigurationElectronicsImproved Measurements of AUX-PSL PLLAttached are gain-variation measurements
of the final, in situ AUX-to-PSL phase-locked
loop (PLL).
 LB1005_OL_transfer.pdfdata.tar.gz 
  13906   Thu May 31 22:59:27 2018 KojiConfigurationComputersShorewall on nodus[Jonathan Koji]

Shorewall (http://shorewall.net/),
a tool to configure iptables, was installed
  
  14020   Tue Jun 26 17:20:33 2018 JonConfigurationCamerasLLO Python Camera Software is WorkingThanks to a discussion yesterday with Joe
Betzweiser, I was able to identify and fix
the remaining problem with the LLO GigE camera
  
  14026   Wed Jun 27 19:37:16 2018 KojiConfigurationComputersNew NAT router installed[Larry, Koji]

We replaced the NAT router between
martian and the campus net. We have the administrative
 P_20180627_193357.jpg 
  14033   Fri Jun 29 18:16:32 2018 JonConfigurationPSLChanges to AUX Optical Layout on PSL TableIn order to use the 0th-order deflection
beam from the AOM for cavity mode scans,
I've coaligned this beam to the
 PSL_AUX_SETUP_CHANGE.pdf 
  14041   Fri Jul 6 12:12:09 2018 AnnalisaConfigurationThermal CompensationThermal compensation setupI tried to put together a rudimentary heater
setup. 

As a heating element, I used the
 IMG_1887.jpgIMG_1884.jpgIMG_1883.jpgIR20180706_0358_labels.png 
  14043   Sat Jul 7 19:50:38 2018 AnnalisaConfigurationThermal CompensationStudy about the Thermal projection setup and its effect on the cavityI made some simulation to study the change
that the heater setup can induce on the Radius
of Curvature of the ETM.
 6x 
  14050   Tue Jul 10 23:44:23 2018 AnnalisaConfigurationThermal CompensationHeater setup assembly[Annalisa, Koji]

Today both the heater and the reflector
were delivered, and we set down the setup
 8x 
  14062   Fri Jul 13 00:15:13 2018 Annalisa, TerraConfigurationAUXY arm cavity scan [Annalisa, Terra, Koji, Gautam]

Summary: We
find a configuration for arm scans which
 IMG_6492.JPGIMG_6494.JPG 
  14071   Fri Jul 13 23:39:46 2018 AnnalisaConfigurationThermal CompensationThermal compensation setup - power supply[Annalisa, Rana]

In order to power the heater setup
to be installed in the ETMY chamber,
 IMG_2012.jpgIMG_2013.jpg20180713_213818.jpg 
  14078   Tue Jul 17 17:37:46 2018 Annalisa, TerraConfigurationThermal CompensationHeaters installationSummary

We
installed two heaters setup on the ETMY bench
in order to try inducing some radius of curvature
 6x 
  14091   Fri Jul 20 18:30:47 2018 JonConfigurationAUXRecommend to install AUX PZT driverI recently realized that the PLL is only
using about 20% of the available actuation
range of the AUX PZT. The +/-10 V control
  
  14104   Wed Jul 25 22:46:15 2018 gautamConfigurationComputersNDS access from outsideAfter this work, I've been having some
trouble getting data with Python NDS. Eventually,
I figured out that the nds connection request
  
  14153   Fri Aug 10 11:29:39 2018 aaronConfigurationUpgradeParts list for BHDI've started putting together a list
of things we'll need to buy to do BHD
readout. I'm still messing around with
  
  14154   Fri Aug 10 16:43:50 2018 gautamConfigurationUpgradeParts list for BHDCan we use the leakage
beam from MMT2 on the OMC table as the
LO beam? I can't find the spec for this
  
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