| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1273
|
Thu Jul 16 21:54:10 2015 |
Matt | DailyProgress | COMSOL | Potential loss sources and more COMSOL modeling | I put together a quick COMSOL model of
the Painter 2 resonator that Zack, Nic, and
I were testing earlier. The first mode was |
|
|
1272
|
Thu Jul 16 00:31:15 2015 |
Matt | Update | COMSOL | Pinwheel modeling with COMSOL and Q measurements | Today Dmitry and I spent some time
simulating the pinwheel cantilever with COMSOL
so that I could get my feet wet with the |
|
|
1271
|
Sun Jul 12 01:21:22 2015 |
rana | Update | SiFi - ringdown | Ringdown measurement with new clamp | Probably right, but hard to be sure.
20% sounds like a lot, but its
really not if the tolerances were not held |
|
|
1270
|
Fri Jul 10 11:44:27 2015 |
Zach | Update | SiFi - ringdown | Ringdown measurement with new clamp | The modes aren't close enough. We designed
these to be different in frequency by increments
of 20% for exactly that reason. |
|
|
1269
|
Fri Jul 10 11:12:16 2015 |
rana | Update | SiFi - ringdown | Ringdown measurement with new clamp | I wonder about the mode beating effect
on the ringdown. Can you post the spectrum
so we can see what the overlap is? If the |
|
|
1268
|
Thu Jul 9 17:45:03 2015 |
Matt | Update | SiFi - ringdown | Ringdown measurement with new clamp | Today Zach and I tried out the new clamp
setup. The clamp is much thicker than the
previous post design and has a lip to constrain |
|
|
1267
|
Wed Jul 8 20:07:21 2015 |
Zach | Summary | SiFi - ringdown | Summary of all ringdowns thus far |
Resonator
f0
[Hz]
T |
|
|
1266
|
Thu Jul 2 16:15:40 2015 |
Zach | DailyProgress | SiFi - ringdown | Quick update on recent measurements | [Matthew, Nic, Zach]
Over
the last few days, we've done 2 significant |
|
|
1265
|
Wed Jun 10 18:09:39 2015 |
Zach | Update | SiFi - ringdown | Second prototype cantilever cryogenic Q not great | I measured the Q of the second
prototype with the new clamp in the cryostat
at low temperature. The result was |
|
|
1264
|
Sun Jun 7 17:33:31 2015 |
Zach | Update | SiFi - ringdown | New clamp received, second prototype cantilever made, some measurements | This is a recap of some things that
have happened over the last couple days that
I have yet to elog. |
8x |
|
1263
|
Sun Jun 7 17:06:49 2015 |
Zach | Lab Infrastructure | Cryo | LN2 refilled, new dewar #200 | (on Thursday...)
|
|
|
1262
|
Wed Jun 3 19:39:18 2015 |
Zach | Notes | SiFi | Si structure fabrication process | I
went into the lab with Justin today to make
our second prototype resonator. |
|
|
1261
|
Tue Jun 2 16:38:17 2015 |
Zach | Update | SiFi | Suspension blades acquired | Norna
very graciously acquired me some spare aLIGO
prototype blade springs. |
|
|
1260
|
Wed May 27 19:23:25 2015 |
Zach | Update | SiFi | First prototype cantilever made | Justin was working this week on
the first barbell-type cantilever, and he
handed me the finished product this afternoon. |
|
|
1259
|
Mon May 18 12:34:06 2015 |
Zach | Summary | SiFi | GWADW 2015 poster | The GWADW poster can be found at G1500651.
Also, here is the rendering I made for it: |
|
|
1258
|
Mon May 18 12:31:25 2015 |
Zach | Photos | SiFi | A taste of things to come... | EDIT (ZK): The rough estimate
for the payload as it is currently envisioned
is about 3 kg, considerably lower than the |
|
|
1257
|
Sun May 17 18:39:48 2015 |
Rana(?) | Photos | SiFi | A taste of things to come... | Sounds wise. But if you have a good idea
of what's needed in terms of mass for
the platform (with appropriate extra trim |
|
|
1256
|
Sat May 16 22:06:55 2015 |
Zach | Photos | SiFi | A taste of things to come... | Talking with him, I got the impression
that going with spares, if they are available,
is the best course. We can probably do better |
|
|
1255
|
Sat May 16 15:34:47 2015 |
rana | Photos | SiFi | A taste of things to come... | Might be able to get blades made instead
of just using spares. Crackle might have
some spares and they also have a place they |
|
|
1254
|
Wed May 13 06:37:30 2015 |
Zach | Photos | SiFi | A taste of things to come... | I've been working on an early-stage
mockup of the in-vacuum setup for the main
experiment for my GWADW poster. |
|
|
1253
|
Thu May 7 03:35:49 2015 |
Zach | Electronics | Sensors | RL readout PD with humbucking | I got the second inductor in recently,
so I tested out the humbucking circuit.
Here are the results of a quick trial: |
|
|
1252
|
Wed May 6 18:01:02 2015 |
nicolas | Lab Infrastructure | Drawings | Cryostat base plate | To lift the cap screws of the cryostat
off the table, I've designed this base
plate. |
|
|
1251
|
Tue May 5 17:10:14 2015 |
rana | Update | SiFi | wafers received | NOVA wafers are here and on the VIP desk
in Koji's office.
ZK: Wafers unpacked |
|
|
1250
|
Thu Apr 30 18:00:47 2015 |
Zach | Update | SiFi | Diced wafers received | We re-received the 6" wafers
we had sent to American Precision Dicing
to be chopped up last week. One |
|
|
1249
|
Thu Apr 30 17:53:20 2015 |
Zach | Cryostat | Purchases | Getters gotten | Being the go-getters we are, we
got our spare getters gotten. They'll
be stored in the cabinet for when we need |
|
|
1248
|
Fri Apr 24 04:31:48 2015 |
Zach | Laser | SiFi | Cavities locked simultaneously, transmission setup built | I was running into some issues
optimizing the servos with the present actuation
setup, and I had a conversation with Dmass |
|
|
1247
|
Thu Apr 23 03:09:49 2015 |
Zach | DailyProgress | SiFi | Windows installed, cryostat top with cavities placed in body, cavities realigned, locked | These things happened over the
last few days but haven't been elogged.
Windows |
|
|
1246
|
Tue Apr 21 21:30:50 2015 |
rana | Lab Infrastructure | Drawings | Lab Layout circa Feb. 2015 (according to Nic) | Heavy Duty (14 gauge steel) cabinet w/o
glass doors, but with door storage ordered.
|
|
|
1245
|
Tue Apr 21 14:19:16 2015 |
Zach | Laser | Purchases | Fiber isolators arrived | We bought some IO-H-1550APC
fiber isolators from ThorLabs last week.
They arrived today: |
|
|
1244
|
Fri Apr 17 05:15:26 2015 |
Zach | Laser | SiFi | Test cavities rebuilt on cold plate, aligned, locked (separately) | Given the level of noise I saw
in air with the table-mounted test cavity
yesterday (CRYO:1242), |
6x |
|
1243
|
Fri Apr 17 04:39:25 2015 |
Zach | Update | SiFi | Two 150mm wafers sent for dicing | I sent two of our 150mm (~6")
wafers to be diced by American
Precision Dicing (Justin's recommendation). |
|
|
1242
|
Thu Apr 16 15:58:02 2015 |
Zach | Laser | SiFi | Gyro RFPDs installed, tuned, E cavity PDH tuned and cavity locked | Well, I got partway through
the plan for the day, anyway.
Rather than align the W |
|
|
1241
|
Wed Apr 15 01:19:14 2015 |
Zach | Laser | SiFi | Input paths, frontal beat, test cavities set up and aligned, ready to lock | I bought and received the last
optics I was missing (90R/10T BSs) last week,
so I began building the real experiment today. |
8x |
|
1240
|
Tue Apr 14 22:27:18 2015 |
rana | Lab Infrastructure | Drawings | Lab Layout circa Feb. 2015 (according to Nic) | Some
cabinet options (for storage of heav-ish |
|
|
1239
|
Mon Apr 13 11:24:32 2015 |
rana | Noise Hunting | Mechanics | Post and base vs. pedestal and fork | Its a nice result. As you say, we are lacking
in good writeups about this topic. Mostly
they're plots in the iLIGO elogs |
|
|
1238
|
Sat Apr 11 23:42:03 2015 |
Zach | Notes | Mechanics | Post and base vs. pedestal and fork | Tonight, I got to do an experiment
that I've wanted to do for some time
now. |
6x |
|
1237
|
Sat Apr 11 19:03:58 2015 |
Zach | Electronics | Sensors | RL readout PD | Seeing Hartmut's talk at the
last LVC meeting about innovative DC photodetector
designs (something necessary for future squeezed |
6x |
|
1236
|
Wed Apr 8 21:12:19 2015 |
Dmass | Cryostat | SiFi | Re-evacuated large cryostat | You can make them yourselves if you want
with activated charcoal and stycast - you
just need to bake and pump to clean it. I |
|
|
1235
|
Tue Apr 7 16:24:18 2015 |
Zach | Cryostat | SiFi | Getter quote | Apparently, the getter is made
by IRLabs themselves. They've quoted
me $690 for a replacement (see |
|
|
1234
|
Sat Apr 4 18:08:18 2015 |
rana | Cryostat | SiFi | Re-evacuated large cryostat | Good point. If you or Nic can find it,
please post some getter info and we can get
a spare just in case this one is already |
|
|
1233
|
Thu Apr 2 20:21:18 2015 |
Zach | Cryostat | SiFi | Re-evacuated large cryostat | I roughed our cryostat back
down tonight. Remember, this model has
a getter that degrades over time when exposed |
|
|
1232
|
Thu Apr 2 01:03:33 2015 |
Zach | Lab Infrastructure | SiFi | Rack set up, table cleared and real layout started | Today, I installed the shelves
into our rack and moved the electronics that
were on the table into it. I then cleared |
|
|
1231
|
Mon Mar 30 17:56:13 2015 |
Dmass | Noise Hunting | Noise Budget | West Photothermal Transfer Function Actually Measured |
Loss vs T. Confused on error bars |
|
|
1230
|
Fri Mar 27 00:26:02 2015 |
Zach | Summary | SiFi - ringdown | Taiwan cantilever phi vs. T (old but unreported) | Before the LVC meeting, I had just
done a long steady-state Q measurement on
the Taiwan cantilever. I got too distracted |
|
|
1229
|
Thu Mar 26 20:06:02 2015 |
Zach | Cryostat | SiFi - ringdown | Small cryostat reassembled, Taiwan cantilever in clamp, pumping down | [Den, Chris, Nic, Zach]
Since my snafu before the
LVC meeting (CRYO:1225), |
|
|
1228
|
Tue Mar 24 14:34:26 2015 |
rana | Things to Buy | Vacuum | Cryostat unpacked (x-post from SUS elog) | I opened one of the viewports today to
inspect it for window size. It does indeed
look like the AccuGlass 2.75 CF (there are |
|
|
1227
|
Mon Mar 23 14:23:09 2015 |
Dmass | Noise Hunting | Noise Budget | West Photothermal Transfer Function Actually Measured | Ran the modified Farsi code with temperature
dependance added in for:
Silicon Thermal Conductivity
Silicon |
8x |
|
1226
|
Thu Mar 19 14:00:21 2015 |
Dmass | Noise Hunting | Noise Budget | West Photothermal Transfer Function Actually Measured | Raw Data from photothermal TFs:
|
8x |
|
1225
|
Thu Mar 12 18:45:50 2015 |
Zach | Cryostat | stuff happens | Epoxy mess | I
brought the cyrostat up to room temperature
today to do some work inside, and there appears |
|
|
1224
|
Tue Mar 10 03:51:42 2015 |
Zach | DailyProgress | SiFi - ringdown | Taiwan cantilever long-term low-temperature phi | I reported in the replied-to entry
that the Q of the Taiwanese cantilever at
low temperatures actually appeared to |
|