ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
14009
|
Fri Jun 22 18:30:21 2018 |
gautam | Update | SUS | ITMY_UL sensor | I think if the magnet fell off, we would
see high DC signal, and not 0 as we do now.
I suspect satellite box or PD readout board/cabling. |
|
14012
|
Sun Jun 24 20:02:07 2018 |
gautam | Update | SUS | Some notes about coil driver noise | Summary:
For a series resistance of 4.5
kohm, we are suffering from the noise-gain |
  |
14019
|
Tue Jun 26 16:28:00 2018 |
gautam | Update | SUS | Coil driver protoboard characterization | I wanted to investigate my coil driver
noise measurement technique under more controlled
circumstances, so I spent yesterday setting |
   |
14032
|
Thu Jun 28 16:48:27 2018 |
gautam | Update | SUS | SOS cage towers | For the upcoming vent, we'd like to
rotate the SOS towers to correct for the
large YAW bias voltages used for DC alignment |
|
14034
|
Mon Jul 2 09:01:11 2018 |
Steve | Update | SUS | ITMY_UL sensor | This bad connection is coming back
|
|
14038
|
Thu Jul 5 10:15:30 2018 |
gautam | Update | SUS | PRM watchdog tripped | PRM watchdog was tripped around 7:15am
PT today morning. I restored it. |
|
14075
|
Tue Jul 17 01:07:40 2018 |
gautam | Update | SUS | ETMY EQ stops | For the heater setup on EY table, I EQ-stopped
ETMY. Only |
|
14090
|
Fri Jul 20 07:43:54 2018 |
Steve | Summary | SUS | ETMY |
|
 |
14108
|
Fri Jul 27 10:48:57 2018 |
Steve | Update | SUS | BS oplev window | Yesterday I inspected this BS oplev viewport.
The heavy connector tube was shorting to
table so It was moved back towards the chamber. |
 |
14115
|
Mon Jul 30 11:05:44 2018 |
gautam | Update | SUS | IFO SUS wonky | When I came in this morning:
PMC was unlocked.
Seis
BLRMS were off scale.
ITMX OSEM |
|
14117
|
Mon Jul 30 16:11:54 2018 |
gautam | Update | SUS | Trillium interface box is broken | [koji,
steve, gautam] |
|
14118
|
Mon Jul 30 18:19:03 2018 |
Koji | Update | SUS | Trillium interface box was fixed and reinstalled | The trillium interface box was removed
from the rack.
The |
 |
14119
|
Tue Jul 31 08:17:55 2018 |
Steve | Update | SUS | Trillium interface box was fixed,reinstalled & working |
|
|
14129
|
Fri Aug 3 15:53:25 2018 |
gautam | Update | SUS | Low noise bias path idea | Summary:
The idea we are going with to push
the coil driver noise contribution down is |
|
14130
|
Fri Aug 3 16:27:40 2018 |
rana | Update | SUS | Low noise bias path idea | Bah! Too complex. |
|
14131
|
Fri Aug 3 18:54:58 2018 |
gautam | Update | SUS | Glitchy MC1 | The wall StripTool indicated that the IMC
wasn't too happy when I came in today.
Specifically: |
|
14134
|
Sun Aug 5 13:45:00 2018 |
gautam | Update | SUS | ETMX tripped | Independent from the problems the vertex
machine has been having (I think, unless
it's something happening over the shared |
 |
14135
|
Sun Aug 5 15:43:50 2018 |
gautam | Update | SUS | Another low noise bias path idea | OK, how about this:
Attachment |
   |
14147
|
Wed Aug 8 23:06:59 2018 |
gautam | Update | SUS | Another low noise bias path idea | Today while Rich Abbott was here, Koji
and I had a brief discussion with him about
the HV amplifier idea for the coil driver |
|
14150
|
Thu Aug 9 12:40:14 2018 |
gautam | Update | SUS | ETMX trip follow-up | A brief follow-up on this since we discussed
this at the meeting yesterday: the attached
DV screenshot shows the full 2k data for |
|
14156
|
Mon Aug 13 09:56:23 2018 |
Steve | Update | SUS | ETMX trip follow-up | Here is an other big one
|
 |
14165
|
Wed Aug 15 19:18:07 2018 |
gautam | Update | SUS | Another low noise bias path idea | I took another pass at this. Here is what
I have now:
Attachment |
    |
14169
|
Thu Aug 16 23:06:50 2018 |
gautam | Update | SUS | Another low noise bias path idea | I had a very fruitful discussion with Rich
about this circuit today. He agreed
with the overall architecture, but made the |
 |
14178
|
Thu Aug 23 08:24:38 2018 |
Steve | Update | SUS | ETMX trip follow-up | Glitch, small amplitude, 350 counts
& no trip.
|
 |
14184
|
Fri Aug 24 14:58:30 2018 |
Steve | Update | SUS | ETMX trips again | The second big glich trips ETMX sus. There
were small earth quakes around the glitches.
It's damping recovered. |
|
14188
|
Wed Aug 29 09:20:27 2018 |
Steve | Update | SUS | local 4.4M earth quake | All suspension tripped. Their damping restored.
The MC is locked.
ITMX-UL & side magnets are |
 |
14190
|
Wed Aug 29 11:46:27 2018 |
Jon | Update | SUS | local 4.4M earth quake | I freed ITMX and coarsely realigned the
IFO using the OPLEVs. All the alignments
were a bit off from overnight. |
|
14201
|
Thu Sep 20 08:17:14 2018 |
Steve | Update | SUS | local 3.4M earth quake | M3.4 Colton shake did not trip sus.
|
|
14223
|
Mon Oct 1 22:20:42 2018 |
gautam | Update | SUS | Prototyping HV Bias Circuit | Summary:
I've been plugging away at
Altium prototyping the high-voltage bias |
  |
14261
|
Thu Oct 18 00:27:37 2018 |
Koji | Update | SUS | SUS PD Whitening board inspection | [Gautam, Koji]
As a part of the preparation for
the replacement of c1susaux with Acromag, |
|
14319
|
Mon Nov 26 17:16:27 2018 |
gautam | Update | SUS | EY chamber work | [steve,
rana, gautam]
PSL and EY 1064nm laser |
|
14399
|
Tue Jan 15 10:52:38 2019 |
gautam | Update | SUS | EY door opened | [chub, bob, gautam]
We took the heavy door off the
EY chamber at ~930am. |
|
14401
|
Tue Jan 15 15:49:47 2019 |
gautam | Update | SUS | EY door opened | While restoring OSEMs on ETMY, I noticed
that the open voltages for the UR and LL
OSEMs had significantly (>30%) changed |
|
14403
|
Wed Jan 16 16:25:25 2019 |
gautam | Update | SUS | Yarm locked | [chub, gautam]
Summary:
Y arm was locked at low power in |
|
14407
|
Fri Jan 18 21:34:18 2019 |
gautam | Update | SUS | Unused optic on EY table | Does anyone know what the purpose of the
indicated optic in Attachment #1 is? |
|
14408
|
Sat Jan 19 05:07:45 2019 |
Koji | Update | SUS | Unused optic on EY table | I don't think it was used. It is not
on the diagram too. You can remove it. |
|
14409
|
Sat Jan 19 15:33:18 2019 |
gautam | Update | SUS | ETMY OSEMs faulty | After diagnosis with the tester box, as
I suspected, the fully open DC voltages on
the two problematic channels, LL and UR, |
 |
14411
|
Tue Jan 22 20:36:53 2019 |
gautam | Update | SUS | ETMY OSEMs faulty | Short update on latest Satellite box woes.
I checked the resistance
of all 5 OSEM coils on ETMY using a DB25 |
|
14413
|
Wed Jan 23 12:39:18 2019 |
gautam | Update | SUS | EY chamber work | While Chub is making new cables for the
EY satellite box...
I removed the unused |
6x |
14415
|
Wed Jan 23 23:12:44 2019 |
gautam | Update | SUS | Prep for FC cleaning | In preparation for the FC cleaning, I did
the following:
Set up mini-cleanroom at |
|
14416
|
Thu Jan 24 15:32:31 2019 |
gautam | Update | SUS | Y arm cavity side first contact applied | EY:
A clean cart was setup
adjacent to the HEPA-enclosed mini cleanroom |
 |
14422
|
Tue Jan 29 22:12:40 2019 |
gautam | Update | SUS | Alignment prep | Since we may want to close up tomorrow,
I did the following prep work:
Cleaned up Y-end suspension |
|
14423
|
Wed Jan 30 11:54:24 2019 |
gautam | Update | SUS | More alignment prep | [chub,
gautam]
ETMY cage was wiped down
Targeted |
 |
14424
|
Wed Jan 30 19:25:40 2019 |
gautam | Update | SUS | Xarm cavity alignment | Squishing cables at the ITMX satellite
box seems to have fixed the wandering ITM
that I observed yesterday - the sooner we |
 |
14425
|
Fri Feb 1 01:24:06 2019 |
gautam | Update | SUS | Almost ready for pumpdown tomorrow | [koji, chub, jon, rana, gautam]
Full story tomorrow, but we went
through most of the required pre close-up |
|
14426
|
Fri Feb 1 13:16:50 2019 |
gautam | Update | SUS | Pumpdown 83 underway | [chub, bob, gautam]
Steps described in previous
elog were carried out
EY heavy |
|
14427
|
Fri Feb 1 14:44:14 2019 |
gautam | Update | SUS | Y arm FC cleaning and reinstall | [Attachment
#1]: ITMY HR face |
  |
14428
|
Fri Feb 1 21:52:57 2019 |
gautam | Update | SUS | Pumpdown 83 underway | [jon, koji, gautam]
IFO is at ~1 mtorr, but
pressure is slowly rising because of outgassing |
|
14433
|
Mon Feb 4 20:13:39 2019 |
gautam | Update | SUS | ETMY suspension oddness | I looked at the free-swinging sensor data
from two nights ago, and am struggling with
the interpretation. |
  |
14441
|
Thu Feb 7 19:34:18 2019 |
gautam | Update | SUS | ETMY suspension oddness | I did some tests of the electronics chain
today.
Drove a sine-wave using |
 |