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ID Date Author Type Category Subjectup Text Attachments
  282   Fri Aug 13 20:23:33 2010 TaraNotesNoiseBudget I tried to separately mesh the geometry.
Only the small part (1/2 radius,
1/3 thickness) is extremely fine mesh, the
  386   Tue Nov 9 22:10:01 2010 taraNotesElectronics Equipment     
  2257   Thu Nov 22 12:49:35 2018 anchalDailyProgressTempCtrl The configuration run:

ran overnight PIDAutoTune with following
  266   Mon Aug 9 19:57:29 2010 taraNotesNoiseBudget DC simulation by COMSOL 4.0I use COMSOL to simulate the mirror of
I tried only DC heating from the
  1374   Sun Oct 27 20:12:25 2013 taraNotesoptic photothermal noise in AlGaAsI revised the calculation for photo-thermal
noise in AlGaAs coatings, the photo thermal
noise should not be a limiting source.
  1392   Wed Dec 18 21:05:28 2013 taraNotesoptic photothermal noise in AlGaAs: thickness resolutionWe heard back from G. Cole about the thickness
resolution in the AlGaAs coating manufacturing
process will be around 0.5 A. So I'm checking
  11   Fri Nov 13 11:12:38 2009 FrankLaserRefCav temp settings for both cavitiescurrent settings for the slow actuator
to bring the cavities on resonance are:

    refcav 1 : 0.6836V
  1075   Wed Nov 14 00:25:48 2012 taraNotesNoiseBudgetฺBrownian noise in spacer and substrate I used COMSOL model to calculated
Brownian noise in substrate. This was done
for cross checking my model simulation. The
  1051   Sun Sep 23 18:28:04 2012 taraNotesDrawings1.45" refcav mountI'm working on the new mount for 1.45"
refcav. I 'll discuss the design with Eric
G and some mech engineers (Mike Smith, Ken
  1054   Thu Sep 27 17:13:13 2012 taraNotesDrawings1.45" refcav mountmodification of the previous mount, work
in progress.
  1068   Wed Oct 31 16:00:13 2012 taraNotesDrawings1.45" refcav mountI finished the design for dual cavity mount.
The assembly looks fine, all parts fit together.
I'll make sure that the mount can be screwed
  1071   Thu Nov 8 20:00:33 2012 taraNotesDrawings1.45" refcav mountI finished the drawing for refcav mount
and the top plate. Everything fits together,
so I'll submit the drawing tomorrow.
  122   Thu May 13 20:56:57 2010 FrankLaserLaser100mW NPRO problemswe still have serious problems with the
100mW laser head. I traced it down to the
connection between the PCB and the hermetically
  69   Fri Feb 19 00:31:40 2010 FrankLaserLaser100mW lightwave NPRO slopePeter gave me the hint that the default
values are stored in an eeprom in the laser
head. So connecting the head to a driver
  785   Tue Jan 17 21:59:47 2012 taraDailyProgressoptic14.75MHz EOMAs we decided to use lower sideband frequency
(14.75MHz, instead of 35.5MHz), I replaced
the Broadband EOM with 14.75MHz EOM.
  787   Thu Jan 19 01:19:31 2012 taraDailyProgressoptic14.75MHz EOMThe 14.75 MHz EOM we have is for visible
light, so we went to TNI and borrowed a 14.75
MHz EOM for IR and an 14.75 Mhz resonant
  434   Mon Dec 20 00:08:57 2010 JanSummaryPEM2-day seismic analysisOne of my DAQs (18bit, 1V range, NI 6289) in
the seismo lab is recording data from
a T240 broadband seismometer on the PSL table.
  2083   Fri Feb 9 11:36:08 2018 awadeDailyProgressNoiseBudget200-3000 Hz hump searchSo  1-2 kHz feature has popped up
from time to time in previous beats. 
It seems to be mostly arise from changes
  2087   Mon Feb 12 16:29:50 2018 awade, CraigDailyProgressNoiseBudget200-3000 Hz hump searchAttempting to identify the source of the
200-3000kHz hump.  

Optimizing polarization into north
  2094   Fri Feb 16 12:41:32 2018 awade, CraigDailyProgressNoiseBudget200-3000 Hz hump searchFollowing up on the last optimization of
RFAM (see PSL:2087),
I tried to obtain the -80 dBm RFAM at the
  1870   Fri Aug 18 21:22:26 2017 Craig, awadeDailyProgressNoiseBudget2017 Aug 18 Trans Beatnote SpectraHere is our first trans spectrum in Vrms/rtHz. 
We haven't had time to fully calibrate
the PLL actuation to get the spectrum into
  1138   Thu Apr 4 11:44:14 2013 EvanNotesPMC270 Hz clamped PMC twisting modeI ran another Comsol simulation with a
simplified version of the PMC spacer. This
time I put fixed constraints on two circular
  1841   Thu Jun 22 14:55:37 2017 awadeMiscElectronics Equipment30A @ 125 V plug install for UPSI've bought a UPS to help the lasers
+ computer ride out the frequenent power
outages in Bridge West.  Its needs a
  1842   Thu Jul 6 15:54:25 2017 awadeDailyProgressElectronics Equipment30A @ 125 V plug install for UPS + rack mountingUPS supply 30A plug is installed in the
PSL lab in the corner by the rack.  Port
  292   Wed Aug 18 16:33:52 2010 FrankSummaryDAQ3123 card broken ?the 3123 card (16bit input) seems to be
broken. That's the card which also samples
the PMC transmitted light which fluctuates
  1860   Tue Aug 15 14:49:27 2017 Craig, awadeDailyProgressPD35.5 MHz RFPDs Transfer FunctionsI took the transfer function through our
two 35.5 MHz RFPDs.

RFPD B, labeled "Low Q"
  1861   Wed Aug 16 12:51:21 2017 ranaDailyProgressPD35.5 MHz RFPDs Transfer FunctionsNo, we don't want low Q
for the PMC RFPDs. We want Q
~10 for the RefCav RFPDs, and whatever high
  1862   Wed Aug 16 13:50:26 2017 awadeDailyProgressPD35.5 MHz RFPDs Transfer FunctionsThe two PMCs craig measured are for the
RefCav RFPDs.  I don't recall if
we had a second 21.5 MHz resonant RFPD for
  1864   Thu Aug 17 00:01:00 2017 ranaDailyProgressPD35.5 MHz RFPDs Transfer Functionsagreed; should do for all labs

  417   Fri Dec 3 02:00:36 2010 taraNotesElectronics Equipment35.5 MHz pick upThere is a 35 MHz pick up from cables to
the crate. Right now there are ACAV and RCAV_RCTRANSPD
that cause the pick up.
  1636   Tue May 31 13:26:21 2016 AidanSummaryRF36MHz and 37MHz Wenzel crystals added to the lab for PDHI have a set of two Wenzel OCXO added to
the electronics chassis, courtesy of the
gentry from the Cryo Lab. The chassis has
  1959   Thu Oct 26 11:08:05 2017 awade, CraigDailyProgressFSS50 MHz oscillations in TTFSS rev. C field boxes[awade, Craig]

As a side note to this diagnostic
oscilloscope probing I noticed the other
  1960   Thu Oct 26 11:21:50 2017 KojiDailyProgressFSS50 MHz oscillations in TTFSS rev. C field boxesIf
you have an oscillation in a circuit, it
is no longer linear!
  1961   Thu Oct 26 15:57:37 2017 awadeDailyProgressFSS50 MHz oscillations in TTFSS rev. C field boxesOk. Doesn't sound great, but is common
to both the units we have.

The AD797 is configured with a
  2424   Wed Sep 11 10:42:50 2019 anchalDailyProgressNoiseBudget500 Hz hump gone!

Checkout the latest noisebudget.
  2127   Fri Mar 9 16:10:41 2018 Craig, awadeDailyProgressscatter500 Hz resonant scatter hump in beatnote ASDIf you look at our
beatnote ASD you can see a broad dirty
hump at 500 Hz.
  2128   Sun Mar 11 16:50:59 2018 Craig, awadeDailyProgressscatter500 Hz resonant scatter hump in beatnote ASDAfter buzzing the table with a probe at
500 Hz, the source of the 500 Hz resonance
is the first steering mirror after the PMC. 
  676   Tue Sep 13 01:11:51 2011 FrankNotesoptic50:50 beamsplitter data - scanned spec sheets from ATFfound the box with the beam splitters Dmass
bought almost 2 years ago but never unpacked
or used. They are super-polished 50:50 beam
  1427   Mon Jun 9 20:42:21 2014 EvanDailyProgressfiber optic60 m PM980-XP fiberI used the 633 nm fiber illuminator and
the ThorLabs power meter (set to 633 nm)
to test the 60 m polarization-maintaining
  2070   Sat Feb 3 18:08:26 2018 awadeDailyProgressPMCA few more modifications to the PMC north boardA few more changes to the PMC north board.
Hopefully this is the last.

Changing series resistance at
  139   Tue Jun 1 19:26:41 2010 taracLaserLaserA mirror gets into the insulation's borderI'm aligning the AOM. The R=0.5m mirror's
position crosses the insulation border by
1.5" (see attached picture.) The black
  517   Mon Feb 28 09:48:27 2011 FrankSummaryRefCavACAV PID parameters wrong after rebooting yesterday the ACAV
heater was railing over night. 
Today i figured out that the integrater
  525   Wed Mar 2 15:47:45 2011 FrankNotesTempCtrlACAV PID process stopped with error PID process running on the Sun workstation
stopped at lunch time with error "couldn't
read process variable ...bla bla bla "
  455   Wed Jan 26 20:21:57 2011 FrankSummaryElectronics EquipmentACAV RFPD modifiedThe ACAV RFPD stopped working this afternoon.
It had high current consumption on the +15V
supply, causing the supply to drop down to
  573   Mon Apr 11 01:43:01 2011 taraNotesElectronics EquipmentACAV RFPD's schematicI updated the schematic for ACAV RFPD.
I'll update the schematic for RCAV
servo, ACAV servo as well.
  902   Fri Apr 6 01:36:39 2012 Tara, FrankSummaryNoiseBudgetACAV loop changessummary of all changes made and more detailed
plots will be posted soon, so check back
  659   Wed Aug 17 20:41:13 2011 taraDailyProgressopticACAV path is upI put most optics on ACAV path. I have
not tried to lock the cavity yet. I'll install
  285   Tue Aug 17 14:35:34 2010 FrankSummaryRefCavACAV re-alignedre-aligned the ACAV once more, now about
91% are coupled into the cavity
  521   Mon Feb 28 13:47:35 2011 FrankNotesRefCavACAV temp back around 37.1 degCcurrent heater value is around 4.66. changed
crate startup value to current value
  1565   Wed Aug 5 15:59:07 2015 Aidan, AntonioSummaryRefCavACAV transmission on RF photodiodeWe swept the temperature of the ACAV laser
and monitored the transmission through the
cavity. In the attached image, the TEM00
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