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New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Type Category Subject Text Attachments
  181   Sun Nov 13 10:11:19 2016 GabrieleGeneralNoise huntingNoise due to airThe plot below compares the QPD signal
spectra in different configurations (roughing
pump on/off, air on/off).
 air_noise.pngair_zoom.png 
  180   Sat Nov 12 09:49:07 2016 GabrieleGeneralMeasurements12 substrates ready for MontrealThe 12 following substrates have been measured
and are ready for the first coating experiment
in Montreal:
 2016-11-12_09.45.42.jpg 
  179   Sat Nov 12 09:39:46 2016 GabrieleGeneralMeasurementsS16004682016-11-12


9:39am,
in chamber, balanced
9:39am, roughing
pump on
9:52, turbo pump on
12:14pm,
 8x 
  178   Fri Nov 11 16:38:23 2016 GabrieleGeneralMeasurementsS16004662016-11-11


4:36pm,
in chamber, balanced
4:38pm roughing
pump on
4:48pm turbo pump on
7:30pm
 spectra.pngpeaks.pngringdowns.pngQs_errorbars.png 
  177   Fri Nov 11 10:29:57 2016 GabrieleGeneralMeasurementsS1600454Note: Marked at "damaged?" by
Alena

2016-11-11


10:28am,
in chamber, balanced
10:29am,
 9x 
  176   Thu Nov 10 17:04:05 2016 GabrieleGeneralNoise huntingTemporary second QPDThis morning I installed temporarily a
second QPD to monitor the input beam. The
goal was to understand where the vibrations
 2016-11-10_10.56.06.jpgspectra.pngcoherence_x.png 
  175   Thu Nov 10 16:13:46 2016 GabrieleGeneralMeasurementsS1600450 againNoticed a small chip on the side, marked
as damaged

2016-11-10


4:00pm,
optical setup realigned to horizontal reference
4:12pm,
 8x 
  174   Thu Nov 10 16:07:13 2016 Alena, CalumGeneralGeneralAnnealing runAnnealing run (466-471) on 3" wafers
- Crime 11/10/2016

https://dcc.ligo.org/LIGO-T1600524
  
  173   Thu Nov 10 14:13:34 2016 gabrieleElectronicsConfigurationMATLAB code to control Thorlabs stagesTo be used to automate the laser polishing.  move_complete.mthrolabs_activex.manimation.mdraw_wafer.m 
  172   Thu Nov 10 10:03:17 2016 GabrieleGeneralMeasurementsS16004652016-11-10


10:01am,
in chamber, balanced
10:03am,
roughing pump on
10:23am, turbo
 10x 
  171   Wed Nov 9 16:25:21 2016 GabrieleGeneralMeasurementsS16004632016-11-09


4:24pm,
in chamber, balanced
4:25pm, roughing
pump on
4:37, turbo pump on
6:44pm:
 8x 
  170   Wed Nov 9 15:32:11 2016 GabrieleGeneralNoise huntingNoise below 2 kHz is not due to the roughing pump, but to the clean air filtersThe two spectra below show basically no
difference (blue roughing pump on, red, roughing
pump off)
 Screenshot-1.pngScreenshot.png 
  169   Wed Nov 9 09:56:50 2016 GabrieleGeneralMeasurementsS16004612016-11-09


9:45am in
chamber, balanced
9:46am roughing
pump on
9:57am turbo pump on
1:02pm:
 9x 
  168   Tue Nov 8 17:09:20 2016 GabrieleGeneralMeasurementsS16004602016-11-08


5:08pm,
in chamber, balanced
5:09pm, roughing
pump on
5:18pm, turbo pump on
7:56:
 8x 
  167   Tue Nov 8 11:39:20 2016 GabrieleGeneralMeasurementsS16004592016-11-08


11:23, in
chamber, balanced
11:25 roughing
pump on
11:38 turbo pump on
1:38pm
 8x 
  166   Mon Nov 7 16:59:10 2016 GabrieleGeneralMeasurementsS16004582016-11-07


4:46pm installed
and balanced
4:47pm, roughing
pump started
4:59pm turbo pump
 8x 
  165   Mon Nov 7 11:27:16 2016 GabrieleGeneralVacuumTurbo pump excites some resonance at 58 HzI looked into a couple of turbo pump switch
on periods, and in both cases when the pump
speed hits 58 Hz, a resonance is excited.
  
  164   Mon Nov 7 10:39:08 2016 GabrieleGeneralMeasurementsS16004572016-11-07


10:30am,
re-aligned optical system to horizontal reference
10:37am,
in chamber balanced
10:38am, started
 8x 
  163   Sun Nov 6 10:14:51 2016 GabrieleGeneralMeasurementsS16004562016-11-06


10:12am:
installed in chamber, balanced
10:14am:
roughing pump on
10:22am: turbo
 12x 
  162   Sat Nov 5 17:40:35 2016 GabrieleGeneralMeasurementsS16004532015-11-05


5:39pm in
chamber, balanced
5:40pm roughing
pump on
5:50pm turbo on
7:55pm:
 spectra.pngpeaks.pngringdowns.pngQs_errorbars.png 
  161   Sat Nov 5 10:49:17 2016 GabrieleGeneralMeasurementsS16004522015-11-05


10:45am
in chamber and balanced
10:48am
roughing pump on
10:56am turbo
 10x 
  160   Fri Nov 4 16:16:23 2016 AlenaGeneralGeneralAnnealing runAnnealing run (454-459) on 3" wafers
- Crime 11/02/2016 https://dcc.ligo.org/LIGO-T1600510

Annealing
run (460-465) on 3" wafers - Crime 11/04/2016
  
  159   Fri Nov 4 14:56:35 2016 GabrieleGeneralMeasurementsS16004512016-11-04


2:45pm:
re-aligned optical setup to horizontal reference
2:55pm:
installed in chamber, balanced
2:56pm,
 13x 
  158   Fri Nov 4 11:31:11 2016 GabrieleElectronicsConfigurationAutocenter control and model modificationsRemoved the peak meter lock from the model,
since it's not used

Added and EPICS binary bit to control
 Screenshot-Untitled_Window.png 
  157   Fri Nov 4 08:13:25 2016 GabrieleElectronicsGeneralPower outage?This morning I found the cymac and the
workstation rebooted, so I suspected a power
cut in the last days. However, the function
  
  156   Fri Nov 4 08:11:57 2016 GabrieleGeneralMeasurementsS16004502016-11-04


8:08am in
chamber
8:38am pumping down
11:50am
QUIET 1162320651 (11:50:34) + 30s, EXCITATION
 spectra.pngpeaks.pngringdowns.pngringdowns.pngQs_errorbars.png 
  155   Tue Nov 1 15:34:49 2016 Alena, CalumGeneral Annealing runAnnealing run (449-453) on 3" wafers
- Crime 11/01/2016 https://dcc.ligo.org/T1600507
  
  154   Mon Oct 31 12:51:13 2016 GabrieleGeneralMeasurementsSimulation of dilution factor and measured loss anglesI made a COMSOL simulation of our wafer
(75 mm with flats, 1 mm thick) with a 1 micron
thick coating (Tantala), and computed the
 simulated_dilution_factors.png 
  153   Sun Oct 30 17:05:47 2016 GabrieleGeneralMeasurementsS1600448 before and after annealing

The plot above compares the measured
 Qs.png 
  152   Sat Oct 29 10:18:41 2016 GabrieleGeneralMeasurementsS1600447 before and after annealing

The plot above compares the measured
 Qs.png 
  151   Sat Oct 29 10:12:39 2016 GabrieleGeneralMeasurementsS1600448 post annealing2016-10-29


venting
at 10:00am 10/29
sample installed,
pumping down started at 10:12am, turbo pump
 9x 
  150   Fri Oct 28 21:20:48 2016 GabrieleGeneralMeasurementsS1600447 post annealingInstallation

I had some problems
in installing the wafer. I balanced it and
started the pump down a couple of times,
 6x 
  149   Thu Oct 27 14:02:38 2016 AlenaGeneralGeneralAnnealingAnnealing run (447-448) on 3" wafers
- Crime 10/27/2016 https://dcc.ligo.org/T1600485-v1

 
  
  148   Tue Oct 25 11:10:37 2016 GabrieleGeneralMeasurementsImage of S1600433This is an image of the sample S1600433
under the microscope, courtesy of GariLynn:

Link
 IMG_3150.JPG 
  147   Tue Oct 25 09:12:31 2016 GabrieleGeneralMeasurementsComparison of first and second batchThe plot below compares a sample from the
first batch and two samples from the second
batch. All samples are as received from Mark
 6x 
  146   Mon Oct 24 16:32:01 2016 GabrieleGeneralMeasurementsS1600448Sample S1600447, as received from
Mark Optics, second batch


in
chamber, pumping down at 4:30pm (2016-10-24)
pumps
 9x 
  145   Mon Oct 24 14:33:46 2016 GabrieleGeneralMeasurementsEffect of annealing: Q increasesS1600439 has been measured as received
(before annealing, elog
137) and after annealing (elog
 annealed_Qs.png 
  144   Mon Oct 24 10:26:30 2016 GabrieleGeneralMeasurementsS1600439S1600439, post annealing

Measurements
before annealing reported in elog 137.
 spectra.pngpeaks.pngringdowns.pngQs_errorbars.png 
  143   Fri Oct 21 15:27:15 2016 GabrieleElectronicsConfigurationRemoved low pass filter in SUMI removed the low pass filter in the QPD
SUM signal, used for normalization. This
reduced a lot the bump at ~20kHz due to laser
 Screenshot.png 
  142   Fri Oct 21 14:03:17 2016 GabrieleGeneralVacuumRoughing pump movedI moved the roughing pump out of the clean
room, adding an extension hose.

 
 compare_pump.pngimprovement_pump.png 
  141   Fri Oct 21 13:45:21 2016 GabrieleGeneralMeasurementsS1600447Sample S1600447, as received from Mark
Optics, second batch

Measurements


Installed
into the chamber, pumping down started at
 13x 
  140   Thu Oct 20 14:38:24 2016 GabrieleCleanDaily ProgressCleaning of S1600433 and S1600438Samples #433 (annealed and cleaned) and
#438 (as received from Mark Optics) are now
with GariLynn for deep cleaning.
  
  139   Thu Oct 20 11:04:03 2016 GabrieleGeneralMeasurementsSample with flame polished edgesSample with edges flame polished in Glasgow

Installation


into
the chamber and balanced at 11am. Pump down
started at 11:00am.
it looks like
 7x 
  138   Wed Oct 19 17:08:47 2016 GabrieleGeneralMeasurementsS1600433 vs S1600438
S1600433 has been annealed, was
contaminated by the iron oxide, and it was
cleaned using first contact. No residual
 compare_433_438.png 
  137   Wed Oct 19 16:40:24 2016 sults:GeneralMeasurementsS1600349S1600439, not annealed, as received
from Mark Optics

Installation


installed
and balanced, pump down started at 4:38pm
 10x 
  136   Wed Oct 19 13:35:23 2016 GabrieleGeneralMeasurementsS1600438S1600438, not annealed, as received
from Mark Optics

Installation


Turbo
pump switched off at 11:42am (2016-10-19)
Turbo
 spectra.pngpeaks.pngringdowns.pngQs_errorbars.pngringdown_rawdata_2016_10_19.m 
  135   Tue Oct 18 16:52:16 2016 GabrieleGeneralMeasurementsSample inspections from annealing run 10/10/2016LIGO-T1600466


S1600432 shows some residual
on face, close to the edge, probably from
  
  134   Tue Oct 18 16:29:37 2016 GabrieleGeneralMeasurementsS1600433S1600433, annealing run 10/10/2016

Installation 


Installed
in the measurement system, chamber closed
pump
down started at 4:27pm LT
turbo
 17x 
  133   Mon Oct 17 10:50:50 2016 GabrieleGeneralVacuumNo sign of problems in the electrostatic driveI opened the chamber and took the etched
disk out. Inspection of the electrostatic
drive does not show any sign of burn or damage.
  
  132   Thu Sep 29 15:40:45 2016 GabrieleOpticsDesignBeam profile of new 21mW HeNe laser and tweak of optical lever designI measured the beam profile of the new
Thorlabs HeNe (21.8 mW measured). The beam
waist is 355 microns, very close to the laser
 beam_profile_all.png 
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