| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
14417
|
Thu Jan 24 22:55:50 2019 |
gautam | Update | Electronics | Satellite box S/N 102 investigation | I had taken Satellite box S/N 102, from
the SRM suspension, down to the Y-end as
part of debugging. However, at some point, |
|
|
14418
|
Fri Jan 25 12:49:53 2019 |
gautam | Update | Electronics | Ethernet Power Strip IP conflict resolved | To avoid the annoying excercise of having
to manually toggle the illuminators, I solved
the IP conflict. Made a wiki |
|
|
14419
|
Fri Jan 25 16:14:51 2019 |
gautam | Update | VAC | Vacuum interlock code, N2 warning | I reset the remote of this git repo to
the 40m version instead of Jon's personal
one, to ensure consistency between what's |
|
|
14420
|
Tue Jan 29 16:12:21 2019 |
Chub | Update | | | The foam in the cable tray wall passage
had been falling on the floor in little bite-sized
pieces, so I investigated and found a fiber |
|
|
14421
|
Tue Jan 29 17:19:16 2019 |
gautam | Update | Electronics | Satellite box S/N 105 repaired | [chub,
koji, gautam]
|
|
|
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 |
|
|
14429
|
Sat Feb 2 21:53:24 2019 |
Koji | Update | VAC | overnight leak rate | The pressure of the main volume increased
from ~1mtorr to 50mtorr for the past 24 hours
(86ksec). This rate is about x1000 of the |
|
|
14430
|
Sun Feb 3 15:15:21 2019 |
gautam | Update | VAC | overnight leak rate | I looked into this a bit today. Did a walkthrough
of the lab, didn't hear any obvious hissing
(makes sense, that presumably would signal |
|
|
14431
|
Sun Feb 3 20:52:34 2019 |
Koji | Update | VAC | overnight leak rate | We can pump down (or vent) annuli. If this
is the leak between the main volume and the
annuli, we will be able to see the effect |
|
|
14432
|
Mon Feb 4 12:23:24 2019 |
gautam | Update | VAC | pumpdown 83 - leak tests | [koji, gautam]
As planned, we valved off the main
volume and the annuli from the turbo-pumps |
|
|
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. |
|
|
14434
|
Tue Feb 5 10:11:30 2019 |
gautam | Update | VAC | leak tests complete, pumpdown 83 resumed | I guess we forgot to close V5, so we were
indeed pumping on the ITMY and ETMY annuli,
but the other three were isolated suggest |
|
|
14435
|
Tue Feb 5 10:22:03 2019 |
chub | Update | | oil added to RP-1 & 3 | I added lubricating oil to roughing pumps
RP1 and RP3 yesterday and this morning.
Also, I found a nearly full 5 gallon jug |
|
|
14436
|
Tue Feb 5 19:30:14 2019 |
gautam | Update | VAC | Main volume at 20 uTorr | Pumpdown looks healthy, so I'm leaving
the TPs on overnight. At some point, we should
probably get the RGA going again. I don't |
|
|
14437
|
Wed Feb 6 10:07:23 2019 |
Chub | Update | | pre-construction inspection | The Central Plant building will be undergoing
seismic upgrades in the near future.
The adjoining north wall along the Y arm |
|
|
14438
|
Thu Feb 7 13:55:25 2019 |
gautam | Update | VAC | RGA turned on | [chub, steve, gautam]
Steve came by the lab today. He |
|
|
14439
|
Thu Feb 7 17:27:53 2019 |
Koji | Summary | Tip-TIlt | Five FiveNine Optics Optics delivered | 5 PR3/SR3 optics from FiveNine Optics were
delivered. The data sheets were scanned and
uploaded to the following wiki page. https://wiki-40m.ligo.caltech.edu/Aux_Optics |
|
|
14440
|
Thu Feb 7 19:28:46 2019 |
gautam | Update | VAC | IFO recovery | [rana, gautam]
The full 1 W is again being sent
into the IMC. We have left the PBS+HWP combo |
|
|
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 |
|
|
14442
|
Fri Feb 8 00:20:56 2019 |
gautam | Summary | Tip-TIlt | Five FiveNine Optics Optics delivered | They have been stored on the 3rd shelf
from top in the clean optics cabinet at the
south end. EX |
|
|
14443
|
Fri Feb 8 02:00:34 2019 |
gautam | Update | SUS | ITMY has tendency of getting stuck | As it turns out, now ITMY has a tendency
to get stuck. I found it MUCH
more difficult to release the optic using |
|
|
14444
|
Fri Feb 8 20:35:57 2019 |
gautam | Summary | Tip-TIlt | Coating spec | [Attachment
#1]: Computed spectral |
|
|
14445
|
Fri Feb 8 20:48:52 2019 |
gautam | Update | LSC | IFO recovery | Several housekeeping tasks were carried
out today in preparation for the Y-arm loss
measurement. |
|
|
14446
|
Mon Feb 11 15:41:49 2019 |
gautam | Update | LSC | TRY 60 Hz solved - but clipping persists | Rich came by the 40m to photocopy some
pages from Hobbs, and saw me working on the
60 Hz hunting. As I suspected, the problem |
|
|
14447
|
Mon Feb 11 16:38:34 2019 |
gautam | Update | LSC | ETMY OL calibration updated | Since we changed the HeNe, I updated the
calibration factors, and accepted the changes
in the SDF. |
|
|
14448
|
Mon Feb 11 19:53:59 2019 |
gautam | Summary | Loss Measurement | Loss measurement setup | To measure the Y-arm loss, I decided to
start with the classic reflectivity method.
To prepare for this measurement, I did the |
|
|
14449
|
Tue Feb 12 18:00:32 2019 |
gautam | Summary | Loss Measurement | Loss measurement setup | Another
arm loss measurement started at 6pm. |
|
|
14450
|
Tue Feb 12 22:59:17 2019 |
gautam | Summary | Loss Measurement | Y arm loss | Summary:
There are still several data quality
issues that can be improved. I think there |
|
|
14451
|
Wed Feb 13 02:28:58 2019 |
gautam | Summary | Loss Measurement | Y arm loss | Attachment #1 shows estimated systematic
uncertainty contributions due to
ITM transmission by +/- |
|
|
14452
|
Thu Feb 14 15:37:35 2019 |
gautam | Update | VAC | Vacromag failure | [chub, gautam]
Sumary:
One of the XT1111 units (XT1111a) |
|
|
14453
|
Thu Feb 14 18:16:24 2019 |
Jon | Update | VAC | Vacromag failure | I sent Gautam instructions to first try
stopping the modbus service, power
cycling the Acromag chassis, then |
|
|
14454
|
Thu Feb 14 21:29:24 2019 |
gautam | Summary | Loss Measurement | Inferred Y arm loss | Summary:
From the measurements I have, the
Y arm loss is estimated to be 58 |
|
|
14455
|
Thu Feb 14 23:14:12 2019 |
gautam | Update | CDS | c1rfm errors | The pressure is still 2e-4 torr according
to CC1 so I thought I'd give ASS debugging
a go tonight. But the arm transmission signal |
|
|
14456
|
Fri Feb 15 11:58:45 2019 |
Jon | Update | VAC | Vac system is back up | The problem encountered with the vac controls
was indeed resolved via the recommendation
I posted yesterday. The Acromags had gone |
|
|
14457
|
Fri Feb 15 15:22:08 2019 |
gautam | Update | CDS | c1rfm errors persist | I restarted c1scy,
|
|
|
14458
|
Fri Feb 15 18:41:18 2019 |
rana | Update | VAC | Vac system is back up | If the acromags lock up whenever there
is an electrical spike, shouldn't we
have them on UPS to smooth out these ripples? |
|
|
14459
|
Fri Feb 15 18:42:57 2019 |
gautam | Update | LSC | TRY 60 Hz solved | A more permanent fix than a crocodile clip was
implemented. Should probably look to do this
for the X end unit as well. |
|
|
14460
|
Fri Feb 15 19:50:09 2019 |
rana | Update | VAC | Vac system is back up | The acromags are on the UPS. I suspect
the transient came in on one of the signal
lines. Chub tells me he unplugged one of |
|
|
14461
|
Fri Feb 15 20:07:02 2019 |
Jon | Update | VAC | Updated vacuum punch list | While working on the vac controls
today, I also took care of some of the remaining
to-do items. Below is a summary of what was done, |
|
|
14462
|
Fri Feb 15 21:15:42 2019 |
gautam | Update | VAC | dd backup of c1vac made |
Connected one of the solid-state
drives to c1vac. It was /dev/sdb.
Formatted
the drive using sudo mkfs -t |
|
|
14463
|
Sun Feb 17 17:35:04 2019 |
gautam | Summary | Loss Measurement | Inferred X arm loss | Summary:
To complete the story before moving
on to ALS, I decided to measure the X arm |
|
|
14464
|
Mon Feb 18 19:16:55 2019 |
rana | Summary | Computers | new laptop setup: ASIA | The old IBM laptop (Asia) has died from
a fan error after 7 years. WE have a new
Lenovo 330 IdeaPad to replace it: |
|
|
14465
|
Tue Feb 19 19:03:18 2019 |
rana | Update | Computers | Martian router -> WPA2 | I have swapped our martian router's
WiFi security over to WPA2 (AES) from the
previous, less-secure, system. Creds are |
|