ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
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 |
|
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 |
|
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 |
    |
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. |
|
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 |
 |
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 |
|
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 |
  |
12446
|
Fri Aug 26 14:05:38 2016 |
Steve | Update | SUS | ETMY UL sensor problematic | This problem has existed well before the
vent
|
|
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 |
|
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 |
 |
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 |
 |
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.
|
 |
12454
|
Tue Aug 30 15:44:28 2016 |
Steve | Update | SUS | wire standoffs update | 100
Sapphire prisms ordered. Delivery date
9-30-2016 |
|
12455
|
Tue Aug 30 20:26:36 2016 |
gautam | Update | SUS | ITMY installed | [gautam,
johannes, lydia] |
  |
12456
|
Wed Aug 31 18:07:43 2016 |
Johannes | Update | SUS | ITMY free swinging | [Lydia, Gautam, Koji, Johannes]
Summary of things done today: |
|
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:
|
|
12459
|
Thu Sep 1 08:30:24 2016 |
Steve | Update | SUS | ITMY_UL is sick | So if the SRM satellite box is good, than
the ITMY sensor UL or vacuum cabeling from
sersor to sat amp is bad. |
 |
12460
|
Thu Sep 1 15:28:01 2016 |
rana | Update | Electronics | Acoustic Tab and Amp Suspension |
add photo of installation
no
more secret personal pages! put channels
into the actual pages that we look at
make |
|
12461
|
Thu Sep 1 15:40:52 2016 |
Steve | Update | SUS | HEPAs on each chamber door | This is an option to isolate the vacuum
chamber from the dusty 40m lab: 4x8 HEPA
unit or |
|
12462
|
Thu Sep 1 15:43:16 2016 |
rana | Update | SUS | OSEM adjustments | On the bounce roll balancing:
Recall that back in 2006, the main
issue was not with the bounce mode coupling |
|
12463
|
Thu Sep 1 17:25:02 2016 |
Praful | Update | Electronics | Acoustic Tab and Amp Suspension | I'll add a picture of the installation
when I get back to campus and finish hooking
up the power cable. I haven't added this |
|
12464
|
Thu Sep 1 19:18:14 2016 |
Johannes | Update | SUS | ITMX and ETMX preemptive table leveling | I balanced the ITMX and ETMX tables into
level position today, for which I had to
move quite a few of the on-table weights. |
8x |
12465
|
Thu Sep 1 19:59:22 2016 |
Johannes | Update | SUS | IR mode flashes in Y arm | [Gautam, Lydia, Johannes]
After placing the irises
on the ETMY and ITMY cages we found that |
|
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 |
|
12468
|
Fri Sep 2 21:16:45 2016 |
rana | Update | Electronics | Satellite Amplifier | In November of 2010, Valera Frolov (LLO),
investigated
our satellite amplifiers and made some recommendations |
|
12469
|
Mon Sep 5 19:57:24 2016 |
Osamu | Update | SUS | OSEM adjustments | Hi 40m people,
As Rana is saying, the bounce mode
does not matter, or we cannot do anything. Generally |
|
12470
|
Mon Sep 5 21:05:06 2016 |
rana | Update | Electronics | Satellite Amplifier | The attached PDF shows the output noise
of the satellite amp. This was calculated
using 'osempd.fil' in the 40m/LISO |
|
12471
|
Tue Sep 6 00:14:14 2016 |
gautam | Update | Electronics | Satellite Amplifier |
|
|
12472
|
Tue Sep 6 18:21:13 2016 |
rana | Update | SUS | OSEM issues | I looked at the PRM free swing spectra.
The modes look like they're at the right
frequencies, so pointing more and more towards |
|
12473
|
Tue Sep 6 20:30:56 2016 |
rana | Update | SUS | ITMY_UL is sick | In the morning, Steve will start opening
the north BS door so that we can enter to
inspect the PRM LR OSEM. |
|
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 |
 |
12477
|
Wed Sep 7 18:00:47 2016 |
Lydia | Update | General | Acromag Progress | [Teng, Lydia]
We
would like to establish a system for setting |
|
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 |
|
12479
|
Fri Sep 9 11:24:15 2016 |
Steve | Update | safety | safety training | Visiting
graduate student Teng Zhang from Glasglow |
|
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 |
|
12481
|
Sat Sep 10 14:26:01 2016 |
rana | Update | General | PRM SRM alignment | For the PRM, I aligned it until the arm
flashes were maximized and the REFL camera
showed a centered spot with dips happening |
|
12482
|
Mon Sep 12 17:15:22 2016 |
Johannes | Update | General | PRM SRM alignment | [Gautam, Steve, Johannes]
We put on the remaining heavy doors
on the chambers (ITMY, ITMX,ETMX, in this |
 |
12483
|
Mon Sep 12 17:54:24 2016 |
Steve | Update | VAC | pumpdown 79 | We are pumping down. The annuloses
are below 10 mTorr
The vacuum gauges are not communicating |
|
12484
|
Mon Sep 12 20:15:22 2016 |
Lydia | Update | SUS | Diagonalization in air | [Lydia, Teng]
We ran the scripts to diagonalize
the damping matrices using the free swinging |
 |
12485
|
Mon Sep 12 20:19:25 2016 |
Lydia | Update | General | MC REFL beam splitter not replaced | The
beam splitter that directs light into the
MC REFL photodiode has not been replaced; |
|
12486
|
Tue Sep 13 11:00:59 2016 |
Lydia | Update | SUS | ETMY UL glitch returned |
|
|