| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
12193
|
Thu Jun 16 18:42:12 2016 |
rana | Update | COC | Contrast as a function of RoC of ETMX | That sounds weird. If the ETMY RoC |
|
|
12194
|
Thu Jun 16 23:02:57 2016 |
gautam | Update | COC | Contrast as a function of RoC of ETMX |
|
|
|
12195
|
Fri Jun 17 15:22:31 2016 |
gautam | Update | VAC | N2 supply line restored after retiling |
|
|
|
12196
|
Fri Jun 17 22:36:11 2016 |
Johannes | Update | PSL | AOM installation | Subham and I have placed the AOM back into
the setup right in front of the PMC.
Steps undertaken: |
|
|
12197
|
Mon Jun 20 01:38:04 2016 |
rana | Update | COC | Contrast as a function of RoC of ETMX | So, it seems that changing the ETMX for
one of the spares will change the contrast
defect from ~0.1% to 0.9%. True? Seems like |
|
|
12198
|
Mon Jun 20 08:26:56 2016 |
Steve | Update | PSL | AOM pictures | Good job Johannes and Subham.
|
|
|
12199
|
Mon Jun 20 09:36:10 2016 |
Steve | Update | SUS | EQ 3.1 m Big Bear Lake, CA | No suspention lost damping.
|
|
|
12203
|
Mon Jun 20 16:33:09 2016 |
Varun | Update | Electronics | Anti-Aliasing Filter circuit schematic | Summary: The aim is to
design an analog anti-aliasing (AA) filter
placed before the ADC, whose function is |
8x |
|
12204
|
Mon Jun 20 18:07:15 2016 |
gautam | Update | COC | Contrast as a function of RoC of ETMX |
|
|
|
12205
|
Tue Jun 21 04:01:09 2016 |
ericq | Update | LSC | Y arm @ 30kHz UGF w/POY, AO | With the newly amplified POY signal, locking
the mode cleaner to the Y arm at ~30kHz bandwidth
was quite straightforward. The offset jumps |
|
|
12209
|
Tue Jun 21 14:12:10 2016 |
Steve | Update | PEM | vacuum envelope wiped | I wiped down the cranes with wet towel
and Mario our janitor did the chamber tops
with the tubes. |
|
|
12210
|
Wed Jun 22 08:40:42 2016 |
rana | Update | LSC | Y arm @ 30kHz UGF w/POY, AO | Below 100 Hz, I suppose this means that
the X arm is now limited by the quadrature
sum of the X and Y arm seismic noise. |
|
|
12211
|
Wed Jun 22 10:15:45 2016 |
varun | Update | CDS | DAFI update: stereo output | I have updated the DAFI with the following
changes:
1) Separated both the channels |
|
|
12212
|
Wed Jun 22 14:03:42 2016 |
Varun | Update | Electronics | Anti-Aliasing Filter circuit schematic | I found an anti-aliasing circuit on the
40m wiki. It consists of A differential LPF
made using THS4131 low noise differential |
|
|
12213
|
Thu Jun 23 17:24:32 2016 |
ericq | Update | General | Tweaks | I spent some time this afternoon reviving
some of my CESAR/ESCOBAR shenanigans on the
Y arm. I found it neccesary to adjust a few |
|
|
12215
|
Mon Jun 27 15:12:09 2016 |
varun | Update | CDS | DAFI update: stereo output | Using an RC to BNC connector from the inner
drawer, I have added a second output cable
going from the output Fibox in the control |
|
|
12217
|
Mon Jun 27 15:47:17 2016 |
Steve | Update | General | QPR clean room gloves | I got some
QPR Nitrile gloves. They are LIGO approved.White
nitrile gloves are naturally anti-static- |
|
|
12218
|
Tue Jun 28 09:14:27 2016 |
Steve | Update | SUS | ETMX optics preparation to be rehanged | Given the effect on the contrast defect,
the consensus at the meeting Wednesday 6-22
was that we should continue to use the existing |
|
|
12219
|
Tue Jun 28 16:06:09 2016 |
gautam | Update | COC | RC folding mirrors - further checks | Having investigated the mode-overlap as
a function of RoC of the PRC and SRC folding
mirrors, I've now been looking into possible |
|
|
12220
|
Tue Jun 28 16:09:41 2016 |
Praful | Update | General | 40m Summary Pages | Set up gwsumm on optimus and generated
summary pages from both L1 and C1 data. Still
a few manual steps need to be taken during |
|
|
12221
|
Tue Jun 28 16:10:49 2016 |
Praful | Update | General | Bluebird Microphones | Found 1 out of 2 bluebird microphones in
the 40m. |
|
|
12222
|
Tue Jun 28 17:11:27 2016 |
Praful | Update | General | EM172 Microphones | Found 60 EM172 microphones. Previous elog
with details: 7777. |
|
|
12224
|
Tue Jun 28 22:54:43 2016 |
Aakash | Update | General | Seismometer Enclosure Development | SURF 2016 | The existing enclosure for seismometer
at LIGO 40m lab is a cylindrical stainless
steel can placed upside down over the seismometer. |
|
|
12225
|
Wed Jun 29 00:09:36 2016 |
Aakash | Update | General | Things from past | SURF 2016 | I have taken out the heaters and temperature
sensors from the enclosure which was made
by Megan last summer. Soon I will test and |
|
|
12226
|
Wed Jun 29 08:20:04 2016 |
Steve | Update | SUS | First Contact shelf life |
We'll follow LIGO policy:
Our
policy is to use first contact within 1 year
of purchase for use in the interferometers. |
|
|
12227
|
Wed Jun 29 14:32:22 2016 |
Steve | Update | SUS | how to remove epoxy from optics |
Hi Steve -
|
|
|
12228
|
Wed Jun 29 15:34:00 2016 |
Steve | Update | safety | SURF 2016 safety | Praful Vasiceddy received 40m specific
basic safety training.
|
|
|
12229
|
Wed Jun 29 16:02:29 2016 |
Steve | Update | SUS | ETMX beam baffle | In the attached photo from 2012, one can
see the installed black glass baffle. According
to the drawings (LIGO-DNNNXXX) this one has |
|
|
12230
|
Wed Jun 29 16:05:47 2016 |
ericq | Update | SUS | ETMX suspension readiness | I've gone through the SOS suspension
document (E970037)
and some old elogs to get an idea of all |
|
|
12231
|
Thu Jun 30 10:03:16 2016 |
Steve | Update | SUS | how to remove epoxy from optics | Proposed Acetone soak dish for SOS epoxy
softening.
It has good acces through 5" |
|
|
12232
|
Thu Jun 30 14:31:02 2016 |
Chemistry | Update | SUS | NO | |
|
|
12233
|
Thu Jun 30 16:11:57 2016 |
ericq | Update | General | Vent Prep | I have updated
the vent
prep checklist on the wiki. Gautam and |
|
|
12234
|
Thu Jun 30 16:21:32 2016 |
gautam | Update | COC | Sideband HOMs resonating in arms | [EricQ, gautam]
Last night, we set about trying
to see if we could measure and verify the |
|
|
12235
|
Thu Jun 30 21:24:36 2016 |
ericq | Update | General | Vent Prep | Steve has ordered some teflon parts to
take the place of the metal parts in his
acetone-soaking jig. They should arrive tomorrow. |
|
|
12236
|
Fri Jul 1 01:52:54 2016 |
Aakash | Update | General | Seismometer Enclosure Development | SURF 2016 | I have transferred most of the temperature
measurement stuff from the front area to
seismometer at the end of Y-arm. While |
|
|
12237
|
Fri Jul 1 09:20:44 2016 |
Steve | Update | VAC | vent 78 | VENT
OBJECTIVES:
1, Fix ETMX sus "jump issue" |
|
|
12238
|
Fri Jul 1 15:48:10 2016 |
Steve | Update | VAC | vent 78 at 710 Torr | I just disconnected the 6th instrument
grade air cylinder from the vacuum envelope
at 720 Torr. Now it will reach equilibrium |
|
|
12240
|
Mon Jul 4 10:30:37 2016 |
ericq | Update | General | Preliminary vent plans | Here are some plans / rough procedures
for this week's vent. It is unlikely
that I have though of everything, but this |
|
|
12241
|
Tue Jul 5 09:25:31 2016 |
Steve | Update | SUS | how to remove epoxy from optics | Glass soaking dish with teflon guides.
|
|
|
12242
|
Tue Jul 5 14:12:56 2016 |
varun | Update | Electronics | Antialiasing Filter Update | I am trying to design an antialiasing filter,
which also has two switchable whitening stages.
I have designed a first version of a PCB |
|
|
12243
|
Tue Jul 5 17:14:02 2016 |
ericq | Update | General | Vent progress | Rough summary of today's progress:
IMC locked, reasonably
aligned. (Only have MC2 trans reference, |
|
|
12244
|
Tue Jul 5 18:44:39 2016 |
Praful | Update | Computer Scripts / Programs | Working 40m Summary Pages | After hardware errors prevented me from
using optimus, I switched my generation of
summary pages back to the clusters. A day's |
|
|
12245
|
Tue Jul 5 19:10:41 2016 |
rana | Update | General | Vent progress | I'd suggest clamping and moving it
to the flow bench so you can inspect with
a bright light. Then remove the wire and |
|
|
12246
|
Tue Jul 5 21:51:35 2016 |
ericq | Update | General | Vent progress | One glitch was seen to occur without a
change in the output voltage monitors in ELOG |
|
|
12247
|
Tue Jul 5 23:38:42 2016 |
gautam | Update | General | Vent progress - ETMX SUS Coil driver electronics investigation | With Koji's help, I've hacked together
an arrangement that will allow us to monitor
the output of the coil driver to the UL coil. |
|
|
12248
|
Wed Jul 6 08:34:00 2016 |
Steve | Update | VAC | RGA scan at day 639 | The last RGA scan of this pumpdown 78
Pressure plot of 640 days long
pd 78 |
|
|
12249
|
Wed Jul 6 09:34:26 2016 |
Steve | Update | General | PRM sensing voltage LR | Yesterday Q noticed that PRM_sensor_LR
was 0.098V This actually went to ~
zero on 7-3 |
|
|
12250
|
Wed Jul 6 10:58:07 2016 |
Steve | Update | VAC | vent 78 valve configuration | Vacuum Status: Chamber Open
All chamber annuloses are vented.
Vac Monitor screen is not communicating with |
|
|
12251
|
Wed Jul 6 10:58:29 2016 |
Varun | Update | CDS | DAFI review | The DAFI block was reviewed by Rana yesterday.
The following changes/improvements were suggested: (Updated
on 20th July 2016 with tasks taat remain |
|
|
12252
|
Wed Jul 6 11:02:41 2016 |
Praful | Update | Computer Scripts / Programs | VMon Tab on Summary Pages | I've added a new tab for VMon under
the SUS parent tab. I'm still working
out the scale and units, but let me know |
|