| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
12454
|
Tue Aug 30 15:44:28 2016 |
Steve | Update | SUS | wire standoffs update | 100
Sapphire prisms ordered. Delivery date
9-30-2016 |
|
|
12453
|
Tue Aug 30 09:51:37 2016 |
Steve | Update | SUS | the chamber HEPA tents are back | How to minimize particles entering the
vacuum envelope.
|
|
|
12452
|
Mon Aug 29 21:53:14 2016 |
Lydia | Update | SUS | ETMY bounce mode coupling | [gautam, johannes, lydia]
We decided to try some different
approaches on minimizing the ETMY bounce |
|
|
12451
|
Mon Aug 29 14:42:06 2016 |
gautam | Update | SUS | ETMY Satellite box diagnostics | I opened up the ETMY satellite box to investigate
the glitches seen in the UL sensor output.
Attachments #1 & 2: The |
|
|
12450
|
Mon Aug 29 09:37:05 2016 |
gautam | Update | SUS | ETMY UL sensor problematic | It looks like the problem is indeed in
the Satellite box. Attachment #1 shows the
second trend for the last 12 hours (~930pm |
|
|
12449
|
Sun Aug 28 21:40:11 2016 |
gautam | Update | SUS | ETMY UL sensor problematic | I wanted to observe the UL coil for any
excursions over the weekend. Looking at the
2 day trend, something is definitely wrong. |
|
|
12448
|
Fri Aug 26 17:48:14 2016 |
gautam | Update | SUS | bounce mode coupling reduction | We worked on reducing the bounce mode coupling
into the sensor signals today. After some
trial and error, essentially following the |
|
|
12447
|
Fri Aug 26 14:09:46 2016 |
ericq | Update | SUS | ETMY UL sensor problematic | We do indeed have a box of clean spare
OSEMs, it should be out with all of the other
boxes of clean stuff we had for the suspension |
|
|
12446
|
Fri Aug 26 14:05:38 2016 |
Steve | Update | SUS | ETMY UL sensor problematic | This problem has existed well before the
vent
|
|
|
12445
|
Fri Aug 26 11:35:44 2016 |
gautam | Update | SUS | ETMY UL sensor problematic | I've been noticing that the ETMY UL
sensor output has been erratic over
the last few days. It seems to be jumping |
|
|
12444
|
Thu Aug 25 21:11:43 2016 |
gautam | Update | SUS | ETMY back in IFO | There was
some confusion as to the order in which we
should go about trying to recover the Y arm. |
|
|
12443
|
Thu Aug 25 20:07:35 2016 |
gautam | Update | SUS | OSEM issues - maybe resolved? | [lydia, johannes,
gautam]
While |
|
|
12442
|
Thu Aug 25 19:03:56 2016 |
Praful | Update | Electronics | Acoustic Tab and Amp Suspension | My box has been suspended in the PSL using
surgical tubing, and it has been connected
to C1:PEM-MIC_1 (C17) with a BNC. I made |
|
|
12441
|
Thu Aug 25 15:43:29 2016 |
ericq | Update | SUS | OSEM issues | We've seen for some time now that one
of the PRM OSEM signals has been gone, and
all of the SRM signals seem dark. We had |
|
|
12440
|
Thu Aug 25 08:19:25 2016 |
Max Isi | Update | General | Summary pages down due to cluster maintenance | The system is back from maintenance and
the pages for last couple of days will be
filled retroactively by the end of the week. |
|
|
12439
|
Wed Aug 24 23:47:30 2016 |
Praful | Update | Electronics | Finished Prototype Box | Gautam helped me drill holes in a metal
box and I set up my circuit inside. Everything
seems to be working so far. Tomorrow I'll |
|
|
12438
|
Wed Aug 24 19:37:55 2016 |
Koji | Update | Electronics | Decoupling capacitor 101 | Yes
Interesting articles how they should
only be used for power decoupling and not |
|
|
12437
|
Wed Aug 24 14:44:33 2016 |
Praful | Update | Electronics | Decoupling capacitor 101 | Do these look good for the ceramic capacitors?
We're running low.
http://www.mouser.com/ProductDetail/Vishay-BC-Components/K104K15X7RF53L2/?qs=sGAEpiMZZMuMW9TJLBQkXmrXPxxCV7CRo6C15yUYAos%3d |
|
|
12436
|
Wed Aug 24 14:11:09 2016 |
Praful | Update | Electronics | Microphone Testing | I added an EM172 to my soldered circuit
and it seems to be working so far. I have
taken a spectra using the EM172 in ambient |
|
|
12435
|
Tue Aug 23 22:58:16 2016 |
Koji | Update | Electronics | Decoupling capacitor 101 | What I suggested was:
- For most cases, power decoupling
capacitors for the regulators should be ~100nF |
|
|
12434
|
Tue Aug 23 19:35:38 2016 |
gautam | Update | SUS | ETMY back in IFO | [johannes,
gautam] |
10x |
|
12433
|
Tue Aug 23 17:05:20 2016 |
Praful | Update | Electronics | Soldered Circuit Working | I remade another soldered circuit, adding
extra 100uF electrolytic bypass capacitors
at the input and output of the voltage regulator |
10x |
|
12432
|
Tue Aug 23 09:50:17 2016 |
Max Isi | Update | General | Summary pages down due to cluster maintenance | Summary pages down today due to schedulted
LDAS cluster maintenance. The pages will
be back automatically once the servers are |
|
|
12431
|
Mon Aug 22 18:35:16 2016 |
Praful | Update | PEM | the lab temp is up | The temperature is decreasing slowly but
is still above 24 C.
|
|
|
12430
|
Mon Aug 22 18:04:24 2016 |
gautam | Update | SUS | ETMY OSEMs inserted | [Johannes, gautam]
We worked on trying to insert the
OSEMs in the optimal positions such that |
|
|
12429
|
Mon Aug 22 16:33:32 2016 |
Steve | Update | PEM | the lab temp is up | The IFO room temp is up a bit and it is
coming down. The out side temp is not really
high. |
|
|
12428
|
Mon Aug 22 13:06:11 2016 |
gautam | Update | SUS | ETMY suspended | Today morning, I suspended ETMY and made
the same checks dscribed below. The clamping
went smoothly, 5 in. lb. of torque seems |
|
|
12427
|
Sun Aug 21 17:21:22 2016 |
Praful | Update | Electronics | Problems with PCB Circuit | For the past week, I've been trying
to make a soldered amplifier circuit to use
in a prototype box, However, I've been |
18x |
|
12426
|
Sun Aug 21 16:23:05 2016 |
gautam | Update | SUS | ETMX suspended |
ETMX has been successfully suspended
I've
used one of the new wire clamps, and also
the new suspension wire
Because |
|
|
12424
|
Fri Aug 19 22:51:12 2016 |
gautam | Update | SUS | ETMs first-contacted | I've applied first contact to both
the ETMs. They're now ready to be suspended.
I've also cut up some lengths of the |
|
|
12423
|
Thu Aug 18 15:16:09 2016 |
Steve | Update | SUS | SOS sus wire is in |
Stress Relieved 0.0017"
Music Wire CFW P/N: CFW2035025, |
|
|
12422
|
Thu Aug 18 14:14:20 2016 |
gautam | Update | SUS | Air-bake of towers - finished | I took the two cages, wires and wire clamps
out this morning, back into the cleanroom
after their 12 hour 70C bake. |
|
|
12421
|
Thu Aug 18 08:17:16 2016 |
Steve | Update | SUS | wire clamping preparation | The wire inprints were removed by 800P
grain paper [Norton 73568] The SS bridge
block now has an undesireble vally in the |
|
|
12420
|
Wed Aug 17 23:00:57 2016 |
gautam | Update | SUS | Air-bake of towers | I just put in the following into the air
bake oven for a 12 hour, 70C bake:
ETMX and ETMY cages (with |
|
|
12419
|
Wed Aug 17 22:09:04 2016 |
rana | Update | SUS | SOS sus wire ordered | Not really true that it passed. That's
just an arbitrary margin. Best to throw away
all the old wire. We have no quantitative |
|
|
12418
|
Wed Aug 17 16:28:46 2016 |
Koji | Update | COC | RC folding mirrors - Numerical review | For the given range of the PR3/SR3 RoCs
for both cases, all the resulting numbers
such as TMSs/mode matching ratios look reasonable |
|
|
12417
|
Wed Aug 17 14:37:36 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review |
|
|
|
12416
|
Wed Aug 17 08:47:43 2016 |
ericq | Update | SUS | Air-bake finished | I turned off the air bake oven at 8:45AM.
I'll leave the optics alone for a bit
while it cools. |
|
|
12415
|
Tue Aug 16 21:54:27 2016 |
gautam | Update | SUS | Air-bake - IN PROGRESS | I
put in both ETMX and ETMY into the air-bake
oven at approximately 8.45pm tonight. |
|
|
12414
|
Tue Aug 16 16:38:00 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review | Here are the results for case 2: (flat
PR3/SR3, for purpose of simulation, I've
used a concave mirror with RoC in the range |
|
|
12413
|
Tue Aug 16 11:51:43 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review | Summary of roundtable meeting yesterday
between EricG, EricQ, Koji and Gautam:
We identified two possible courses |
|
|
12412
|
Tue Aug 16 08:04:49 2016 |
Steve | Update | SUS | ETMY had Aluminum bridge | The SOS ETMY tower had and Aluminum bridge.
How is it possible that this was true? Is
SS better than Al for some quantitative |
|
|
12411
|
Mon Aug 15 18:28:15 2016 |
gautam | Update | SUS | Air-bake preparation | I
assume that we are prepared to live with
the pitch bias situation of ETMY |
|
|
12410
|
Mon Aug 15 14:34:33 2016 |
ericq | Update | SUS | SOS sus wire ordered | We have indeed seen numerous tarnished/rusty
points along the wires, and just tried to
choose lengths free of any of these. I wonder |
|
|
12409
|
Mon Aug 15 14:29:32 2016 |
Steve | Update | SUS | SOS sus wire ordered | The wire will arrive in 1-2 weeks. It is
a new production. Brad Snook of Ca Fine Wire
was suprised that we are still using the |
|
|
12408
|
Mon Aug 15 12:23:56 2016 |
Praful | Update | PEM | Mic Self Noise | I didn't have a separate training set
and data set, so I think that's why the
graphs came out looking too good. The units |
9x |
|
12407
|
Sat Aug 13 18:25:22 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review | This elog
is meant to summarize my numerical simulations
for looking into the effects of curvature |
|
|
12406
|
Fri Aug 12 21:26:28 2016 |
rana | Update | PEM | Mic Self Noise | Seems to good to be true. Maybe you're
over fitting? Please put all the traces on
one plot and let us know how you do the parameter |
|
|
12405
|
Fri Aug 12 19:13:25 2016 |
Praful | Update | Electronics | Mic Self Noise | I used the Wiener filtering method described
by Ignacio and Jessica (https://dcc.ligo.org/DocDB/0119/T1500195/002/SURF_Final.pdf
and https://dcc.ligo.org/public/0119/T1500194/001/Final_Report.pdf) |
8x |
|
12404
|
Fri Aug 12 14:37:34 2016 |
Steve | Update | SEI | working seismometers as they are | 2.1 mag earth quake in Norhten Ca
Our seimometers need professorial
centering. Related electronics must be checked |
|