| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
369
|
Tue Jul 18 09:13:08 2017 |
Gabriele | General | Measurements | Shear and bulk losses in tantala | S1600525 has been coated in Fort Collins
with 480nm of pure tantala. I used the emasured
loss angles (after deposition, before annealing) |
7x |
|
370
|
Wed Jul 19 21:19:14 2017 |
Gabriele | General | Measurements | Shear and bulk losses in tantala | To quantify which of the fit below is the
most significant, I did a Bayesian analysis
(thanks Rory for the help!). |
|
|
238
|
Fri Dec 9 13:13:32 2016 |
Gabriele | General | Measurements | Silicon sample | Silicon wafer from WRS materials, diameter
3", thickness 356-406 microns.
2016-12-09
1:00pm, |
|
|
154
|
Mon Oct 31 12:51:13 2016 |
Gabriele | General | Measurements | Simulation of dilution factor and measured loss angles | I made a COMSOL simulation of our wafer
(75 mm with flats, 1 mm thick) with a 1 micron
thick coating (Tantala), and computed the |
|
|
72
|
Tue Aug 2 15:58:12 2016 |
Gabriele | Electronics | Daily Progress | Six QPD functional and tested | I finished populating the new four QPD
boards, and fixed the first one I populated
weeks ago. I tested all five new boards: |
|
|
265
|
Thu Jan 19 12:49:17 2017 |
Gabriele | Facility | Vacuum | Skyhook installed | The SkyHook has been put in place and bolted
down to the floor.
|
|
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314
|
Wed Feb 22 13:56:15 2017 |
Gabriele | Electronics | Configuration | Software improvements |
created a single interface to move
the picomotors in front of QPD1 ... QPD4
the
command qpdcenter |
|
|
277
|
Wed Jan 25 16:12:05 2017 |
Gabriele | General | Daily Progress | Some assembly |
assembled the four in-vacuum periscopes
(no mirrors yet)
soldered kapton
wires to the four ESD board; the vacuum side |
|
|
83
|
Sun Aug 14 11:40:29 2016 |
Gabriele | Electronics | Daily Progress | Some python code | Today I wrote some auxiliary functions
that will be useful for the measurement system:
noise.py: set of functions |
|
|
305
|
Tue Feb 14 10:55:13 2017 |
Gabriele | General | Daily Progress | Something fishy with bay 4 of the new setup | I did two set of measurements with the
new coated samples from Montreal. I reshuffled
the position in the two measurements. In |
|
|
81
|
Sat Aug 13 11:17:17 2016 |
Gabriele | Facility | Daily Progress | Spot the differences | |
|
|
103
|
Tue Aug 23 09:21:25 2016 |
Gabriele | General | General | Status of Mark Optics disks | We initially received 20 disks (75 mm diameter,
1 mm thickness) from Mark Optics. Here's
their status as of today |
|
|
50
|
Mon Jul 18 17:48:58 2016 |
Gabriele | Electronics | Configuration | Status of real time system and workstation | [EricQ, Gabriele]
The real time system seems to be
working properly, except for the excitations: |
|
|
48
|
Mon Jul 18 14:29:07 2016 |
Gabriele | General | Daily Progress | Status of the test setup | I checked that the QPD electronics works
as expected, and that I can acquire the signals
using the ADCs. A new model (x3cr1) is up |
|
|
242
|
Tue Dec 13 11:42:52 2016 |
Gabriele | General | General | Steve Penn's model of loss angle | The plot below shows the best loss angle
we expect foer our samples, based on Steve
Penn's model of surface and volume losses |
|
|
80
|
Fri Aug 12 10:33:14 2016 |
Gabriele | Electronics | Configuration | Storage added to cymac3 | Installed two new 2TB disks into the cymac3.
Also, the main disk has a 1TB partition with
the operating system, so I created a new |
|
|
444
|
Wed Dec 6 07:53:47 2017 |
Gabriele | General | Measurements | Substrates from University Wafers | 2017-12-06
Four fused silica
substrates from University Wafers, 76.2mm
diameter / 0.5 mm thickness installed in |
|
|
308
|
Thu Feb 16 09:47:29 2017 |
Gabriele | General | Measurements | Summary of coating runs carried out at Montreal |
Substrate |
|
|
216
|
Tue Nov 29 17:02:06 2016 |
Gabriele | Facility | Noise hunting | Suspending the roughing pump | I suspended the roughing pump with four
springs. The reduction of the 58 Hz peak
is similar to what I got when the pump was |
|
|
336
|
Thu Mar 30 15:23:44 2017 |
Gabriele | Optics | General | Swapped HeNe laser in CR0 | The JDSU HeNe laser 1103P that I was using
is dead. I swapped it with a JDSU 1125P borrowed
from the 40m. |
|
|
311
|
Fri Feb 17 13:44:47 2017 |
Gabriele | Optics | Daily Progress | Swapped picomotor and re-alignment | Since I had recurrent problems with the
picomotors used for QPD3, I swapped them
with another Newport motorized mirror that |
|
|
379
|
Wed Jul 26 09:27:40 2017 |
Zach | Electronics | Modeling | Sweeping the space between ESD and sample | 2017-07-26
I ran a
sweep of the gap between the ESD and the
sample, first from .5 mm to 1 mm. That sweep |
|
|
195
|
Thu Nov 17 12:06:39 2016 |
Gabriele | General | Vacuum | Switching on the IGM moves the disk | Here's a trend of the QPD signals when
the IGM was turned on:
|
|
|
9
|
Mon May 2 11:46:45 2016 |
Gabriele | Facility | Daily Progress | Table and vacuum chambers in the lab | Elogs for the new Coatin
RIng-down
MEasurement |
|
|
10
|
Tue May 3 11:57:47 2016 |
Gabriele | Facility | Daily Progress | Table and vacuum chambers in the lab | We discovered a couple of days ago that
the table was sitting on three legs only
and the fourth one was dangling. I managed |
|
|
456
|
Tue Jan 30 15:56:36 2018 |
Gabriele, Craig | Electronics | Configuration | Temporary data acqusition for PSL lab beat note and accelerometers | We set up the model x3tst to acquire at
65kHz four signals coming from the PSL lab:
X3:TST-BEAT_OUT_DQ: beat |
|
|
176
|
Thu Nov 10 17:04:05 2016 |
Gabriele | General | Noise hunting | Temporary second QPD | This morning I installed temporarily a
second QPD to monitor the input beam. The
goal was to understand where the vibrations |
|
|
124
|
Fri Sep 23 08:11:48 2016 |
Gabriele | Mechanics | Daily Progress | Test of the disk retaining ring motion | In brief, it doesn't work. The magnets
and coils are strong enough to push up the
ring with a sample inside, but the friction |
|
|
100
|
Mon Aug 22 12:01:52 2016 |
Gabriele | General | General | Tests of the day | Disk excited at 12:01pm. Exited the room
at 12:03pm.
Opened the chamber at about 2:30pm, |
|
|
67
|
Thu Jul 28 13:58:48 2016 |
Alena, Gabriele | Clean | Daily Progress | The old chamber is now being cleaned and baked | Cleaned the chamber in the washing machine
at 40m and started 48 baking at 120 C |
|
|
76
|
Wed Aug 10 10:04:35 2016 |
Gabriele | Mechanics | Daily Progress | The prototype of the disk retain system is here | Yesterday we received the prototype of
the disk suspension and retain system. Everything
looks good. I checked that the disk fits |
6x |
|
239
|
Mon Dec 12 08:42:44 2016 |
Gabriele | General | Measurements | Thermoelastic losses in Si sample | Following the model from R. Nawrodt et
al. Investigation of mechanical losses
of thin silicon flexures at low temperatures, |
|
|
237
|
Thu Dec 8 15:32:04 2016 |
Gabriele | Electronics | Configuration | Timing issue: is it a DAC issue? | My previous
test showed that the timing drift was
somehow related to the output of the signal |
6x |
|
240
|
Mon Dec 12 14:15:53 2016 |
Gabriele | Electronics | Configuration | Timing issue: is it a DAC issue? | I swapped the DAC with another one, but
I see the same behavior in the output signal.
Here's a spectrum of the DAC output, |
|
|
244
|
Sat Dec 17 06:29:15 2016 |
rana | Electronics | Configuration | Timing issue: is it a DAC issue? | I find sometimes that the probe configuration
can give these distorted signals. For the
Tektronix probes, its best to use a 500 MHz |
|
|
303
|
Fri Feb 10 17:16:28 2017 |
Gabriele | Mechanics | Daily Progress | Translation stage to move retaining rings | This afternoon I installed the picomotor
and the translation stage that will be used
to move the retaining rings up and down. |
|
|
304
|
Sat Feb 11 16:22:26 2017 |
Gabriele | Mechanics | Daily Progress | Translation stage to move retaining rings | The ring motion up and down was not very
smooth, again due to friction on the centering
pins. |
|
|
400
|
Wed Aug 9 15:57:28 2017 |
Zach | Electronics | Modeling | Triangular Geometry | 2017-08-09
I compared
the triangular geometry to the original geometry
and the excitation was only improved |
|
|
224
|
Mon Dec 5 10:39:16 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | For a long time I had problems with the
GPS time in frames being different from the
real one. |
|
|
227
|
Tue Dec 6 09:02:17 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | Things seems to be worse now. This morning
I injected noise at GPS 1165078533 (real
time, as obtained from the python command |
|
|
228
|
Tue Dec 6 10:38:19 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | UPDATE:
Now the time difference is about
30 seconds. It seems that the real time model |
|
|
229
|
Tue Dec 6 11:22:58 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | I swapped the SR signal generator with
an Agilent 33210A. Shut down and restarted
the cymac3. Now the command line GPS and |
|
|
231
|
Tue Dec 6 16:55:51 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | Update at 5pm, GPS times are still in sync.
|
|
|
232
|
Wed Dec 7 08:14:05 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | Unfortunately, this morning the model time
is again wrong...
|
|
|
235
|
Wed Dec 7 16:27:11 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | I put back the Stanford Reserch signal
generator. On a scope, the timing signal
looks good. There is a small ripple and some |
|
|
236
|
Thu Dec 8 09:26:10 2016 |
Gabriele | Electronics | Configuration | Trying to debug GPS time issue | For the last ~day the difference between
the frontend GPS time and the machine GPS
time remained constant between -1 and -2 |
|
|
165
|
Mon Nov 7 11:27:16 2016 |
Gabriele | General | Vacuum | Turbo pump excites some resonance at 58 Hz | I 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. |
|
|
498
|
Tue Mar 27 16:37:22 2018 |
Gabriele | General | Vacuum | Turbo pump for test chamber CR0 set point | I changed the set point of the test chamber
turbo pump to 666 Hz. This was done
by setting the "standby rotation speed" |
|
|
326
|
Thu Mar 2 11:27:47 2017 |
Gabriele | General | Noise hunting | Turbo pump of CR0 pollutes CR1 | The turbo pump of the CR0 chamber runs
at 833 Hz. It causes vibrations that pollute
the measurements in the CR1-4 chamber. In |
|
|
414
|
Wed Aug 16 16:05:09 2017 |
Zach | Electronics | Modeling | Two ESD First test | 2017-08-16
I created
a model with two ESD's, essentially a
combination of my previous two attempts with |
|