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ID Date Author Typedown Category Subject Text Attachments
  198   Thu Nov 17 17:59:44 2016 Gabriele, AlastairGeneralGeneralCO2 laser polishing testsWe improved the control software of the
laser polishing system: now the rotation
speed is large when the laser is missing
 2016-11-17_14.30.00.jpg2016-11-17_14.22.53.jpg 
  199   Fri Nov 18 09:27:26 2016 GabrieleGeneralMeasurementsCO2 polishing improves the Q !!The plot below shows that the Q values
of S1600439 improved a lot after the CO2
laser polishing. About 15 modes have Q above
 results_2016_11_17b.pngpolished_Qs.png 
  200   Fri Nov 18 11:39:59 2016 GabrieleGeneralMeasurementsS1600480Note: marked at "D?" by Alena

2016-11-18


11:38am,
in chamber, balanced
11:39am,
 11x 
  201   Fri Nov 18 15:48:09 2016 GabrieleGeneralMeasurementsMicroscope inspection of CO2 polished samplesS1600470

For reference, this
sample has not been CO2 polished, but it
has been annealed and measured. It has quite
 11x 
  202   Sun Nov 20 14:40:14 2016 GabrieleGeneralMeasurementsS1600482Note: marked as "scratched" by
Alena

2016-11-20


2:38pm,
 9x 
  203   Mon Nov 21 11:05:51 2016 GabrieleGeneralMeasurementsS1600487Note: not annealed

2016-11-21


11:04am
in chamber, balanced
11:05am roughing
 8x 
  204   Mon Nov 21 11:46:57 2016 GabrieleGeneralGeneralMicroscope inspection of 439 and 487S1600439

This is the sample
that was CO2 polished (198)
and measured after polishing (197,
 8x 
  205   Mon Nov 21 16:21:12 2016 Gabriele, AlastairGeneralGeneralLaser polishing of S1600487The sample has been laser polished this
afternoon, 0.5mm/s, average power 23 W.

We moved the lens that focuses the
  
  206   Mon Nov 21 16:37:01 2016 GabrieleGeneralMeasurementsS1600487 post polishing2016-11-21


4:34pm,
in chamber, balanced
4:35pm, roughing
pump on
4:45pm, turbo pump on
Excitations


Quiet
 9x 
  208   Tue Nov 22 14:11:38 2016 GabrieleGeneralMeasurementsLaser polishing of bad disk improves Q, but they're still not very goodLaser polishing of a sample from the second
batch (S1600487, bad Q as out of the box)
improves the Q values, but they're still
 polishing_Qs.pngpolishing_Qs.png 
  209   Wed Nov 23 08:55:41 2016 GabrieleGeneralNoise hunting"Advanced" vibration isolationIn normal conditions the RMS of the QPD
signals is dominated by the 58 Hz line generated
by the roughing pump. Also, when the modes
 2016-11-22_15.22.13.jpgvibration_isolation.png 
  210   Wed Nov 23 14:16:59 2016 AlenaGeneralGeneralMicroscope inspectionMicroscope inspection of samples:

S1600487  https://dcc.ligo.org/S1600487-v7

S1600438 https://dcc.ligo.org/S1600438
  
  211   Mon Nov 28 10:35:54 2016 GabrieleGeneralMeasurementsS16004842016-11-28


10:25am,
optical setup realigned to horizontal reference
10:35am,
in chamber, balanced
10:40am,
 8x 
  212   Mon Nov 28 15:06:09 2016 GabrieleGeneralMeasurementsMIT sample 1 (bare disk)2016-11-28


3:00pm:
removed the retaining ring and the alignment
pins
3:05pm, 100mm/0.5mm disk
 9x 
  213   Mon Nov 28 16:02:16 2016 GabrieleGeneralGeneralExpected frequencies for the MIT samples


  
  214   Tue Nov 29 11:26:46 2016 GabrieleGeneralMeasurementsMIT sample 2 (disk with 4 1"/0.1mm glued blanks)2016-11-19

 11x 
  215   Tue Nov 29 16:42:51 2016 GabrieleGeneralMeasurementsMIT sample 3 (disk with 4 0.5"/0.125" glued blanks)2016-11-29

 13x 
  218   Wed Nov 30 10:02:20 2016 GabrieleGeneralMeasurementsMIT sample 4 (disk with 3 1"/0.1mm glued blanks)2016-11-30

 12x 
  219   Thu Dec 1 11:55:09 2016 GabrieleGeneralMeasurementsS1600433Note: sample deep cleaned by GariLynn

2016-12-01


11:45am,
installed back the movable alignment ring,
 12x 
  220   Thu Dec 1 11:59:21 2016 Gabriele, AlastairGeneralGeneralLaser polishing Today we laser polished S1600484, S1600485
and S1600486.

 2016-12-01_11.26.30.jpg2016-12-01_11.15.39.jpg2016-12-01_11.34.32.jpg2016-12-01_11.26.41.jpg 
  221   Fri Dec 2 10:56:40 2016 GabrieleGeneralMeasurementsCleaning improves the Q values a bitThe plot below compares the measured Q
values of S1600433 right after annealing,
and after GariLynn cleaned it. Q values are
 cleaning.pngcleaning.png 
  222   Fri Dec 2 11:20:56 2016 GabrieleGeneralMeasurementsS1600484 after laser polishing2016-12-02


11:08am,
in chamber, balanced
11:10am,
roughing pump on
11:20am, turbo
 12x 
  223   Fri Dec 2 14:05:47 2016 GabrieleGeneralGeneralMIT bare disk losses reproduced with edge and surface lossesThe measured losses of the MIT bare disk
show a remarkable split into families. The
plot belo shows the measured total loss angles
 loss_angle.pngfrequencies_exp_vs_model.pngenergy_ratios.pnglosses_fit.pnglosses_fit.png 
  225   Mon Dec 5 12:59:48 2016 GabrieleGeneralMeasurementsS1600485 post laser polishing2016-12-05


12:45pm,
in chamber, balanced
12:46pm,
roughing pump on
12:59pm, turbo
  
  230   Tue Dec 6 14:57:33 2016 GabrieleGeneralMeasurementsS1600486 post laser polishingNote: marked as scratched by Alena

2016-12-06


2:44pm,
in chamber, balanced
2:46pm, roughing
 12x 
  234   Wed Dec 7 09:59:59 2016 GabrieleGeneralMeasurementsMIT sample 3 (disk with 4 0.5"/0.125" glued blanks) second round2016-12-07


Removed
retaining ring and pins, aligned optical
setup to horizontal reference
9:59am,
 18x 
  238   Fri Dec 9 13:13:32 2016 GabrieleGeneralMeasurementsSilicon sampleSilicon wafer from WRS materials, diameter
3", thickness 356-406 microns.

2016-12-09


1:00pm,
 spectra.pngpeaks.pngringdowns.pngresults_2016_12_09a.png 
  239   Mon Dec 12 08:42:44 2016 GabrieleGeneralMeasurementsThermoelastic losses in Si sampleFollowing the model from R. Nawrodt et
al. Investigation of mechanical losses
of thin silicon flexures at low temperatures,
 te_model.png 
  241   Mon Dec 12 16:34:15 2016 Gabriele, Brittany, AaronGeneralMeasurementsS16004802016-12-12


4:32pm,
in chamber, balanced
4:33pm, roughing
pump on
4:46pm, turbo pump on


2016-12-13


Excitation:

Quiet
  
  242   Tue Dec 13 11:42:52 2016 GabrieleGeneralGeneralSteve Penn's model of loss angleThe plot below shows the best loss angle
we expect foer our samples, based on Steve
Penn's model of surface and volume losses
 losses_model.png 
  243   Thu Dec 15 11:58:55 2016 GabrieleGeneralGeneralEffect of clip fingerprints on dilution factorThe disks coated at Montreal are hold with
three small clips. Therefore there are three
small regions close to the edge that are
 2016_12_07_Sample_447_Pre_deposition_250C.jpgclips.pngclips_effect.pngclips_effect_relative.png 
  245   Sat Dec 17 12:20:38 2016 GabrieleGeneralMeasurementsS1600447 after coating (tantala 250 deg. C)2016-12-16


1:41pm:
in chamber, balanced (coating facing up)
1:42pm:
roughing pump on
1:54pm: turbo
  
  246   Sat Dec 17 13:06:06 2016 GabrieleGeneralMeasurementsS1600457 after coating (tantala RT)2016-12-17


12:54pm,
in chamber, balanced. Added a ND0.3 to avoid
QPD saturation
12:55pm, roughing
  
  247   Sun Dec 18 14:42:22 2016 GabrieleGeneralMeasurementsS1600456 after coating (tantala 250 deg. C)2016-12-18


2:29pm,
in chamber, balanced
2:30pm, roughing
pump on
2:42pm, turbo pump on
Excitations:


Quiet
  
  248   Mon Dec 19 10:29:09 2016 GabrieleGeneralMeasurementsS1600458 after coating (tantala RT)2016-12-19


10:27am:
in chamber, balanced
10:28am,
roughing pump on
10:40am, turbo
  
  249   Tue Dec 20 10:00:38 2016 GabrieleGeneralMeasurementsS1600463 control sample2016-12-20


9:58am,
in chamber, balanced. Removed ND0.3
10:00am,
roughing pump on
10:12am, turbo
 control.png 
  250   Tue Dec 20 15:52:12 2016 GabrieleGeneralMeasurementsS1600447 after cleaning2016-12-20


3:50pm,
in chamber, balanced. ND0.3 installed back
3:51pm,
roughing pump on
4:02pm, turbo
  
  251   Wed Dec 21 09:00:00 2016 GabrieleGeneralMeasurementsS1600456 after cleaning2016-12-21


8:59am,
in chamber, balanced
9:00am, roughing
pump on
9:11am, turbo pump on
Excitations:


Quiet
  
  252   Wed Dec 21 14:32:41 2016 GabrieleGeneralMeasurementsS1600457 after cleaning2016-12-21


2:22pm,
in chamber, balanced
2:23pm, roughing
pump on
2:33pm, turbo pump on
5:00pm,
  
  253   Thu Dec 22 09:47:58 2016 GabrieleGeneralMeasurementsS1600458 after cleaning 

2012-12-22


9:46am,
in chamber, balanced, removed ND0.3
9:48am,
  
  255   Fri Jan 6 11:23:10 2017 GabrieleGeneralMeasurementsMark Optics 4This is one of the samples we got
from the first batch, no flats, edge not
polished
 results_2017_01_06a.pngresults_2017_01_06b.pngresults_2017_01_06c.pngresults_2017_01_06d.png 
  256   Fri Jan 6 12:19:22 2017 Alena, Bob, Stephen and CalumGeneralDaily ProgressSecond vacuum chamberCleaning and baking (200 C air foe SS and
120 for Al) parts for the new vacuum chamber

 bake.jpg 
  257   Tue Jan 10 11:29:23 2017 GabrieleGeneralMeasurementsS1600459 post depositionNote:Coated with tantala at 400C

2017-01-10


11:15am
in chamber, balanced, added ND0.3 to reduce
  
  258   Tue Jan 10 16:50:20 2017 GabrieleGeneralMeasurementsS1600461 post depositionNote:Coated with tantala at 400C

2017-01-10


4:48pm,
in chamber, balanced
4:49pm, roughing
  
  259   Wed Jan 11 09:01:59 2017 GabrieleGeneralMeasurementsS1600448 post depositionNote: coated with tantala at 480C

2017-01-11


9:00am
in chamber, balanced
9:01am, roughing
  
  260   Thu Jan 12 10:09:41 2017 GabrieleGeneralMeasurementsS1600453 post depositionNote: coated with tantala at 480 C

2017-01-12


10:07am
in chamber, balanced
10:09am,
  
  262   Wed Jan 18 14:02:56 2017 GabrieleGeneralMeasurementsS1600466 control sample2017-01-18


2:01pm,
in chamber, balanced, removed ND
2:02pm,
roughing pump on
2:14pm, turbo
 control.pngScreen_Shot_2017-01-19_at_9.33.33_AM.pngScreen_Shot_2017-01-19_at_9.33.33_AM.png 
  263   Wed Jan 18 14:29:16 2017 AlenaGeneralAnnealingAnnealing run (489-490) on 3" wafers - Crime 01/18/2017
Started annealing run Annealing run
(489-490) on 3" wafers - Crime 01/18/2017
 Prepairing_for_annealing_489_490.jpgIn_the_furnace_489_490.jpg 
  264   Thu Jan 19 07:32:33 2017 AlenaGeneralVacuumNew chamber first pimp downThe new chamber was build. The first attempt
to pump down was unsuccessful because of
dislocated lid. After the lit was placed
 unnamed.jpg 
  267   Thu Jan 19 14:27:02 2017 AlenaGeneralVacuumFirst vacuum test new chamberTurbo pump controller (new chamber) was
configured. Need to reduce the frequency
or setup a standby mode. First pump down:
 20170119.png 
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