| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1386
|
Mon Nov 11 19:37:13 2013 |
tara | DailyProgress | optic | redo- PMC path | PMC 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 |
tara | Notes | Documentation | thesis on ctn | I created an svn folder for my thesis on
CTN measurement.
It can be found here |
|
|
1388
|
Wed Nov 20 18:19:01 2013 |
tara | DailyProgress | NoiseBudget | photothermal noise in SiO2/Ta2O5 | I 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 |
tara | Notes | RefCav | eigenmodes of 1.45" refcav | I 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 |
tara | Notes | Electronics Equipment | OLG 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 |
tara | Notes | optic | photothermal noise in AlGaAs: thickness resolution | We 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 |
8x |
|
1393
|
Tue Dec 31 19:33:47 2013 |
tara | Summary | NoiseBudget | beat measurement | I 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 |
tara | DailyProgress | DAQ | mDV in ATF | I'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 |
tara | Summary | NoiseBudget | Noise budget fitting: need uncertainties | I 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 |
tara | Summary | NoiseBudget | error in spacer brownian noise | Spacer in BR noise
== COMSOL vs result from Kessler |
|
|
1403
|
Mon Feb 3 23:56:07 2014 |
tara | Photos | optic | packing 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 |
tara | Notes | RefCav | comsol 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 |
tara | Notes | RefCav | comsol simulation for cavity suspension | I 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 |
tara | Notes | NoiseBudget | extracting 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 |
tara | Notes | NoiseBudget | extracting 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 |
tara | Notes | NoiseBudget | extracting phiL phiH | I'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 |
tara | Notes | NoiseBudget | extracting 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 |
tara | Notes | NoiseBudget | extracting phiL phiH |
|
|
|
1416
|
Wed Mar 26 21:53:50 2014 |
tara | Notes | NoiseBudget | extracting 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 |
tara | Notes | NoiseBudget | extracting phiL phiH | Heat 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 |
tara | DailyProgress | DAQ | mDV in ATF |
|
|
|
1423
|
Wed May 7 12:27:25 2014 |
tara | Notes | NoiseBudget | noise comparison | I plotted our measurement together with
other experiments. The source file and fig
files are attached below. |
|
|
1424
|
Fri May 9 17:10:25 2014 |
tara | Notes | NoiseBudget | noise comparison | Add the measurement from
AlGaAs coating, and Silicon refcav (see CRYO:1045 |
|
|
1425
|
Sat May 17 22:01:28 2014 |
tara | Notes | optic | Coating TO opt for Adv LIGO: ETM | Here is a prelim result
for AlGaAs TO opt for ETM coating.
|
7x |
|
1426
|
Sun May 18 10:45:42 2014 |
tara | Notes | optic | Coating TO opt for Adv LIGO | I 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 |
tara | Notes | NoiseBudget | aLIGO 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 |
tara | Notes | NoiseBudget | aLIGO Noise budget with uncertainties in material parameters | I'm estimating the BNS range
of aLIGO. Here is a quick note about the
calculation. |
|
|
1436
|
Thu Jun 26 03:41:31 2014 |
tara | Notes | NoiseBudget | aLIGO Noise budget with uncertainties in material parameters |
|
|
|
1441
|
Tue Jul 1 19:27:25 2014 |
tara | DailyProgress | Computers | Installing 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 |
tara | Notes | NoiseBudget | aLIGO Noise budget with uncertainties in material parameters | The calculation for LIGO
astronomical reach with uncertainties are
updated. See the details below. |
6x |
|
1449
|
Tue Jul 15 18:26:20 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I'm setting up a scattered
light measurement for AlGaAs samples. The
methods are summarized below. |
|
|
1450
|
Tue Jul 15 23:40:16 2014 |
tara | Notes | PMC | PMC heater | How 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 |
tara | DailyProgress | optic | setting up scattered light measurement | I'm testing the setup and
a code for extracting scattered light from
the images. |
|
|
1455
|
Wed Jul 23 00:28:14 2014 |
tara | DailyProgress | optic | setting up scattered light measurement | I'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 |
tara | DailyProgress | optic | setting up scattered light measurement | I rechecked the CCD response
vs exposure time and power. The results
are linear. |
|
|
1462
|
Wed Jul 30 17:47:56 2014 |
tara | DailyProgress | optic | BRDF 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 |
tara | Notes | Vacuum | ion pump is on | I 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 |
tara | HowTo | NoiseBudget | optimization 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 |
tara | Notes | TempCtrl | epic for slow control is disabled | Perl 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 |
tara | Notes | BEAT | note 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 |
tara | Notes | Vacuum | transmission 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 |
tara | DailyProgress | PMC | Epoxy 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 |
tara | DailyProgress | PMC | Epoxy glue on PMC mirror and PZT | We ordered fixtures for gluing mirror-pzt-end
cap. Waiting for the glue to settle. |
|
|
1615
|
Sat Mar 26 13:36:09 2016 |
tara | DailyProgress | PMC | Epoxy 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 |
tara | DailyProgress | PMC | test on new PMC | We
tested one of the two new PMCs. finesse
is ~ 500 and the PZT works fine. |
|
|
1620
|
Thu Mar 31 15:11:27 2016 |
tara | DailyProgress | PMC | test on new PMC | The
measured finesse for the new PMC is ~ 300.
The previous calculation was wrong because |
|
|
1623
|
Tue Apr 5 16:32:36 2016 |
tara | DailyProgress | PMC | test on new PMC | We 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 |
tara | DailyProgress | PMC | test on new PMC |
Note: V input for RFPD should be
+/- 15 V (schematic)
Power
for driving 21.5 MHz resonant EOM, can |
|
|
1627
|
Fri Apr 8 09:44:49 2016 |
tara | DailyProgress | PMC | test on new PMC | I checked the VME crate, and made
sure that the PMC cards/ LO were
functioning. |
|
|
1631
|
Wed Apr 13 16:45:18 2016 |
tara | HowTo | RefCav | Optical Contact Tutorial | I
showed Antonio how to do optical contact
(refcav-mirror setup). The videos and |
|