ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
12335
|
Mon Jul 25 20:37:46 2016 |
gautam | Update | General | ETMX suspension - Side OSEM test | [Lydia, gautam]
Summary: We
did some preliminary tests to check if at |
|
12340
|
Tue Jul 26 18:07:57 2016 |
gautam | Update | General | ETMX suspension - Further OSEM Tests | Today, we did the following:
Once again, inserted all
four face OSEMs till the sensor voltage readouts |
|
12347
|
Thu Jul 28 13:49:44 2016 |
gautam | Update | General | ETMX magnets re-reglued |
|
 |
12349
|
Thu Jul 28 17:48:17 2016 |
gautam | Update | General | ETMY LR magnet broke off | While ETMX magnets were curing, I wanted
to try and suspend ETMY in the endchamber,
put in the OSEMS and see if the magnets aligned |
|
12357
|
Fri Jul 29 20:12:54 2016 |
gautam | Update | SUS | third time - no luck | [lydia, gautam]
Summary: |
|
12362
|
Wed Aug 3 00:15:39 2016 |
gautam | Update | SUS | ETMX suspended | [lydia, steve, ericq, gautam]
Summary: |
|
12370
|
Thu Aug 4 03:14:39 2016 |
gautam | Update | SUS | ETMX suspended |
|
|
12377
|
Fri Aug 5 02:17:10 2016 |
gautam | Update | SUS | ETMX Ruby Wire Standoff Ready for Gluing | Part
1: Rotation of optic
|
8x |
12381
|
Fri Aug 5 18:21:28 2016 |
gautam | Update | SUS | ETMX Ruby Wire Standoff GLUED |
The latest twist in this apparently
never-ending saga was that even though fine
pitch balancing was achieved, the wire was |
11x |
12396
|
Wed Aug 10 19:37:08 2016 |
gautam | Update | Electronics | Mic Amplifier | In order to help Praful do his huddle test,
I have temporarily arranged
for the outputs of the 3 channels he wants |
|
12401
|
Thu Aug 11 11:56:40 2016 |
gautam | Update | SUS | ETMY re-suspended |
|
|
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 |
   |
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 |
|
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 |
   |
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 |
   |
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. |
|
12417
|
Wed Aug 17 14:37:36 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review |
|
|
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 |
|
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. |
|
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 |
|
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 |
|
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 |
|
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 |
|
12434
|
Tue Aug 23 19:35:38 2016 |
gautam | Update | SUS | ETMY back in IFO | [johannes,
gautam] |
10x |
12443
|
Thu Aug 25 20:07:35 2016 |
gautam | Update | SUS | OSEM issues - maybe resolved? | [lydia, johannes,
gautam]
While |
|
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. |
|
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 |
  |
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 |
|
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. |
|
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 |
|
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 |
 |
12455
|
Tue Aug 30 20:26:36 2016 |
gautam | Update | SUS | ITMY installed | [gautam,
johannes, lydia] |
  |
12457
|
Wed Aug 31 22:09:18 2016 |
gautam | Update | SUS | Y arm locked to Green | Koji tweaked the alignment sliders till
we were able to get the Y arm locked to green
in a 00 mode, GTRY ~ 0.5 which is the prevent |
|
12458
|
Wed Aug 31 23:01:02 2016 |
gautam | Update | SUS | the chamber HEPA tents are back | Some more numbers we found while working
in/around the chamber today:
|
|
12466
|
Fri Sep 2 21:09:08 2016 |
gautam | Update | SUS | Y arm locked in air | [johannes, lydia, gautam]
The Y arm has been locked
to IR in air using POY11 as an error signal |
 |
12467
|
Fri Sep 2 21:15:53 2016 |
gautam | Update | SUS | ITMX and ETMX preemptive table leveling | The ITMX table had relaxed overnight into
a slightly misaligned state overnight - since
the ITMX table holds PR2 and hence can affect |
|
12471
|
Tue Sep 6 00:14:14 2016 |
gautam | Update | Electronics | Satellite Amplifier |
|
|
12474
|
Tue Sep 6 20:45:14 2016 |
gautam | Update | SUS | X arm test masses back in chamber | [Teng, Johannes,
Lydia, gautam]
The |
   |
12475
|
Tue Sep 6 20:52:42 2016 |
gautam | Update | SUS | OSEM issues |
The |
|
12476
|
Wed Sep 7 17:23:26 2016 |
gautam | Update | SUS | PRM LR fixed for now | [johannes, gautam]
We took the heavy door
off in the morning with Steve's help
The |
 |
12478
|
Thu Sep 8 22:12:36 2016 |
gautam | Update | SUS | X arm in place, locked to green, IR flashes visible | Detailed elog to follow but summary of
todays activities:
ITMX and ETMX are back |
|
12480
|
Fri Sep 9 17:50:02 2016 |
gautam | Update | SUS | Heavy doors on BS-PRM, ETMY chambers | [steve, teng, johannes, lydia, gautam]
we set about doing some
final checks on the Y arm while Johannes |
|
12526
|
Fri Sep 30 19:53:07 2016 |
gautam | Update | endtable upgrade | X end IR pickoff fiber coupled | [johannes, gautam]
Today we re-installed the fiber
coupler on the X-endtable to couple some |
|
12532
|
Wed Oct 5 16:28:10 2016 |
gautam | Update | endtable upgrade | EX laser power monitor PD installed | I installed a 10% BS to pick off some of
the light going to the IR fiber, and have
added a Thorlabs PDA55 PD to the EX table |
|
12533
|
Wed Oct 5 19:10:04 2016 |
gautam | Update | General | Arm loss measurement review | [ericq,gautam]
There are multiple methods by which
the arm loss can be measured, including, |
|
12534
|
Wed Oct 5 19:43:13 2016 |
gautam | Summary | General | Vent review | This elog is meant to review some of the
important changes made during the vent this
summer - please add to this if I've forgotten |
|
12542
|
Mon Oct 10 11:48:05 2016 |
gautam | Update | CDS | Power-cycled c1susaux, realigned PMC, spots centered on WFS1 and WFS2 | [Koji, Gautam]
We did the following today morning:
I re-aligned the PMC - |
|
12545
|
Mon Oct 10 18:34:52 2016 |
gautam | Update | General | PZT OM Mirrors | I did a quick survey of the drive electronics
for the PZT OM mirrors today. The hope is
that we can correct for the clipping observed |
|
12551
|
Tue Oct 11 13:30:49 2016 |
gautam | Update | SUS | PRM LR problematic again | Perhaps the problem is electrical? The
attached plot shows a downward trend for
the LR sensor output over the past 20 days |
|
12552
|
Wed Oct 12 13:34:28 2016 |
gautam | Update | SUS | PRM LR problematic again | Looks like what were PRM problems are now
seen in the SRM channels, while PRM itself
seems well behaved. This supports the hypothesis |
|