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ID Date Authorup Type Category Subject Text Attachments
  1386   Mon Nov 11 19:37:13 2013 taraDailyProgressopticredo- PMC pathPMC path is back, I aligned the polarization
of the input beam to the BB EOM for TTFSS.
The visibility of PMC is now ~ 80%.
  1387   Tue Nov 12 15:27:32 2013 taraNotesDocumentationthesis on ctnI created an svn folder for my thesis on
CTN measurement.
It can be found here
  1388   Wed Nov 20 18:19:01 2013 taraDailyProgressNoiseBudgetphotothermal noise in SiO2/Ta2O5I compared our beat measurement with results
from Numata2003 and TNI. They agree well.
I'm quite certain that we reach Brownian
  1389   Mon Nov 25 15:28:12 2013 taraNotesRefCaveigenmodes of 1.45" refcavI realized that we have not checked the
eigenmodes of 1.45" cavity yet, so I
used comsol to find out several modes. The
  1390   Mon Dec 16 15:14:43 2013 taraNotesElectronics EquipmentOLG of RCAV TTFSS open loop gain transfer function
of RCAV is measured. 
 1) how to measure OLG TF
  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
  1393   Tue Dec 31 19:33:47 2013 taraSummaryNoiseBudgetbeat measurementI got a chance to measure beat measurement.
The noise budget is updated and contains
all dominant noise traces.
  1399   Fri Jan 24 21:13:13 2014 taraDailyProgressDAQmDV in ATFI'm trying to record beat measurement for
a few days. The data will be taken from ATF
using mDV. There are a few issues about mDV
  1400   Wed Jan 29 05:44:51 2014 taraSummaryNoiseBudgetNoise budget fitting: need uncertaintiesI looked into the uncertainty in coating
thickness of the QWL SiO2/Ta2O5 coating The
thickness of  4.53 +/- 0.07 um (~1.5%)seems
  1401   Wed Jan 29 21:36:53 2014 taraSummaryNoiseBudgeterror in spacer brownian noise Spacer in BR noise
== COMSOL vs result from Kessler
  1403   Mon Feb 3 23:56:07 2014 taraPhotosopticpacking mirror I"m packing the mirrors so that
they are ready to be shipped to G. Cole.
The mirrors are packed properly, see 
  1405   Tue Feb 4 01:11:01 2014 taraNotesRefCavcomsol simulation for cavity suspension I'm trying to estimate the coupling
between seismic to displacement noise of
the cavity using COMSOL. 
  1407   Tue Mar 4 18:53:48 2014 taraNotesRefCavcomsol simulation for cavity suspensionI tried to estimate the coupling from seismic
to displacement noise. With the common mode
rejection taken into account, the coupling
  1408   Thu Mar 20 18:09:33 2014 taraNotesNoiseBudgetextracting phiL phiH Since we measured thermal noise from
the coating(QWL, SiO2/Ta2O5), we want to
extract loss angles of each materials.  The
  1411   Sat Mar 22 19:17:31 2014 taraNotesNoiseBudgetextracting phiL phiH I checked Brownian coating noise
level with uncertainties in coating parameters.
The measured result is barely at the edge
  1412   Sun Mar 23 17:32:42 2014 taraNotesNoiseBudgetextracting phiL phiHI'm checking how loss angle of Ta2O5 is
related to its Young's modulus (as used in
ring down measurements), then I use that
  1413   Mon Mar 24 20:56:35 2014 taraNotesNoiseBudgetextracting phiL phiH Ta2O5 Young's modulus is quoted to
be 140 GPa from this paper Martin1993,
 but that is the value of Ta2O5 deposited
  1414   Tue Mar 25 14:37:54 2014 taraNotesNoiseBudgetextracting phiL phiH


  1416   Wed Mar 26 21:53:50 2014 taraNotesNoiseBudgetextracting phiL phiH I used results from ring down measurement
in Penn 2003, without assuming the values
of YL,YH. If the actual Young's moduli of
  1417   Sat Mar 29 23:32:50 2014 taraNotesNoiseBudgetextracting phiL phiHHeat treatment after coating changes loss
angles of both SiO2 and Ta2O5. Our coating
might really have higher loss (maybe because
  1421   Thu Apr 24 18:54:44 2014 taraDailyProgressDAQmDV in ATF


  1423   Wed May 7 12:27:25 2014 taraNotesNoiseBudgetnoise comparisonI plotted our measurement together with
other experiments. The source file and fig
files are attached below.
  1424   Fri May 9 17:10:25 2014 taraNotesNoiseBudgetnoise comparisonAdd the measurement from
AlGaAs coating, and Silicon refcav (see CRYO:1045
  1425   Sat May 17 22:01:28 2014 taraNotesopticCoating TO opt for Adv LIGO: ETMHere is a prelim result
for AlGaAs TO opt for ETM coating.
  1426   Sun May 18 10:45:42 2014 taraNotesopticCoating TO opt for Adv LIGOI did an optimized structure
for ITM and plotted the estimated noise budget
of AdvLIGO using optimized AlGaAs coating
  1428   Tue Jun 10 17:00:18 2014 taraNotesNoiseBudgetaLIGO Noise budget with uncertainties in material parameters I'm working on estimating aLIGO sensitivity
when material uncertainties are taken into
account. I have a result for a reference
  1432   Mon Jun 23 17:13:06 2014 taraNotesNoiseBudgetaLIGO Noise budget with uncertainties in material parametersI'm estimating the BNS range
of aLIGO. Here is a quick note about the
  1436   Thu Jun 26 03:41:31 2014 taraNotesNoiseBudgetaLIGO Noise budget with uncertainties in material parameters


  1441   Tue Jul 1 19:27:25 2014 taraDailyProgressComputersInstalling prosilica gc750 Manassa is helping me installing
a camera for scattering measurement. The
work is in progress.
  1444   Wed Jul 2 20:05:32 2014 taraNotesNoiseBudgetaLIGO Noise budget with uncertainties in material parametersThe calculation for LIGO
astronomical reach with uncertainties are
updated. See the details below.
  1449   Tue Jul 15 18:26:20 2014 taraDailyProgressopticsetting up scattered light measurementI'm setting up a scattered
light measurement for AlGaAs samples. The
methods are summarized below.
  1450   Tue Jul 15 23:40:16 2014 taraNotesPMCPMC heaterHow hot do you need to heat it? if the
thermal expansion of aluminum/steel is much
higher than that of fused silica, then just
  1452   Thu Jul 17 18:57:54 2014 taraDailyProgressopticsetting up scattered light measurementI'm testing the setup and
a code for extracting scattered light from
the images. 
  1455   Wed Jul 23 00:28:14 2014 taraDailyProgressopticsetting up scattered light measurementI'm checking
the linearity of power and exposure on the
camera. The ccd counts are quite linear with
  1456   Thu Jul 24 02:00:23 2014 taraDailyProgressopticsetting up scattered light measurementI rechecked the CCD response
vs exposure time and power. The results
are linear.
  1462   Wed Jul 30 17:47:56 2014 taraDailyProgressopticBRDF of AlGaAs mirror 143 I
used the setup to measure scattered loss
from an REO mirror (mirror for iLIGO refcav,
  1483   Sun Aug 24 20:07:57 2014 taraNotesVacuumion pump is onI turned the ion pump for vacuum chamber
on. The initial current is 7.3mA ( the value
before opening the chamber was 7 uA)
  1484   Mon Aug 25 03:56:17 2014 taraHowToNoiseBudgetoptimization for ETM with a-Si/SiO2 coatings  I used optimization codes for ETM.
The optimization reduce the PSD of Brownian
noise by ~ 3/4 (in units of [m^2/Hz]) from
  1516   Mon Sep 15 02:24:48 2014 taraNotesTempCtrlepic for slow control is disabledPerl scripts for controlling the vacuum
tank and slow feedback to the two lasers
are acting weird. Usually we can run three
  1517   Mon Sep 15 04:32:21 2014 taraNotesBEATnote for tonight beat RCAV transPD_DC :0.54 V
ACAV transPD_DC: 0.16 V (loop might
oscillate when DC level was measured, need
  1520   Mon Sep 15 18:36:32 2014 taraNotesVacuumtransmission of vacuum windows We measured the transmission of the
vacuum windows. The total transmission through
two windows is 0.975 +/- 0.002.
  1613   Tue Mar 22 16:29:04 2016 taraDailyProgressPMCEpoxy glue on PMC mirror and PZT[Antonio,Tara] We glue PMC back mirror
to PZT and wait for it to settle.

Since we have all parts for the
  1614   Thu Mar 24 19:07:38 2016 taraDailyProgressPMCEpoxy glue on PMC mirror and PZTWe ordered fixtures for gluing mirror-pzt-end
cap. Waiting for the glue to settle.
  1615   Sat Mar 26 13:36:09 2016 taraDailyProgressPMCEpoxy glue on PMC mirror and PZT 

The glue is dry and the back PMC mirror
is steady. we are ordering the o-ring
  1617   Wed Mar 30 08:29:15 2016 taraDailyProgressPMCtest on new PMCWe
tested one of the two new PMCs. finesse
is ~ 500 and the PZT works fine.
  1620   Thu Mar 31 15:11:27 2016 taraDailyProgressPMCtest on new PMCThe
measured finesse for the new PMC is ~ 300.
The previous calculation was wrong because
  1623   Tue Apr 5 16:32:36 2016 taraDailyProgressPMCtest on new PMCWe are hacking the PMC card, to
try to lock the PMC without using a computer.

Aidan helped me try to lock
  1624   Wed Apr 6 15:02:50 2016 taraDailyProgressPMCtest on new PMC
Note: V input for RFPD should be
+/- 15 V (schematic)
for driving 21.5 MHz resonant EOM, can
  1627   Fri Apr 8 09:44:49 2016 taraDailyProgressPMCtest on new PMCI checked the VME crate, and made
sure that the PMC cards/ LO were
  1631   Wed Apr 13 16:45:18 2016 taraHowToRefCavOptical Contact TutorialI
showed Antonio how to do optical contact
(refcav-mirror setup).  The videos and
ELOG V3.1.3-