| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
14495
|
Mon Mar 25 10:21:05 2019 |
Jon | Update | Upgrade | c1susaux upgrade plan | Now that the Acromag upgrade of c1vac is
complete, the next system to be upgraded
will be c1susaux. We chose c1susaux because |
|
|
14494
|
Thu Mar 21 21:50:31 2019 |
rana | Update | VAC | Protection against AC power loss | agreed - we need all pumps on UPS for their
safety and also so that we can spin them
down safely. Can you and Chub please find |
|
|
14493
|
Thu Mar 21 18:36:59 2019 |
Jon | Omnistructure | Upgrade | Vacuum Controls Switchover Completed | Updated vac channel list is attached. There
are several new ADC channels.
|
|
|
14492
|
Thu Mar 21 18:09:36 2019 |
Koji | Update | CDS | db file preparation for acromag c1susaux | I have updated the google doc spreadsheet
to indicate the required action for the new
dbfile |
|
|
14491
|
Thu Mar 21 17:22:52 2019 |
Jon | Update | VAC | More vac controls upgrades | I've converted all the vac control
system code to run on Python 3.4, the latest
version available through the Debian |
|
|
14490
|
Thu Mar 21 12:46:22 2019 |
Jon | Update | VAC | More vac controls upgrades | The vac controls system is going down for
migration from Python 2.7 to 3.4. Will advise
when it is back up. |
|
|
14489
|
Wed Mar 20 20:07:22 2019 |
Jon | Update | VAC | Doing vac controls work | Work is completed and the vac system is
back in its nominal state.
|
|
|
14488
|
Wed Mar 20 19:26:25 2019 |
Jon | Update | VAC | Protection against AC power loss | Today I implemented protection of the vac
system against extended power losses. Previously,
the vac controls system (both old and new) |
|
|
14487
|
Wed Mar 20 12:31:30 2019 |
Jon | Update | VAC | Doing vac controls work | I'm rebooting the IOLAN server to load
new serial ports. The interlocks might trip
when the pressure gauge readbacks cut out. |
|
|
14486
|
Mon Mar 18 20:22:28 2019 |
gautam | Update | ALS | ALS stability test | I'm running a test to see how stable
the EX green lock is. For this purpose, I've
left the slow temperature tuning servo on |
|
|
14485
|
Mon Mar 18 18:10:14 2019 |
Koji | Summary | General | Task items and priority | [Gautam/Chub/Koji] ~ Mini discussion
Maintenance / Upgrade Items
(Priority high to low) |
|
|
14484
|
Mon Mar 18 17:06:12 2019 |
gautam | Update | Optical Levers | ITMY HeNe replaced | Oplev HeNe was replaced this afternoon.
We did some HeNe shuffling:
A new HeNe was being used |
|
|
14483
|
Mon Mar 18 12:27:42 2019 |
gautam | Update | General | IFO status |
c1iscaux2
VME crate is damaged - |
|
|
14482
|
Sun Mar 17 21:06:17 2019 |
Anjali | Update | ALS | Amplifier characterisation | The goal was to characterise the new amplifier
(AP1053). For a practice, I did the characterisation
of the old amplifier.This test is similar |
|
|
14481
|
Sun Mar 17 13:35:39 2019 |
Anjali | Update | ALS | Power splitter characterization | We characterized the power splitter ( Minicircuit-
ZAPD-2-252-S+). The schematic of the measurement
setup is shown in attachment #1. The network/spectrum/impedance |
|
|
14480
|
Sun Mar 17 00:42:20 2019 |
gautam | Update | ALS | NF1611 cannot be shot-noise limited? | Summary:
Per the manual (pg12)
of the NF 1611 photodiode, the "Input |
|
|
14479
|
Thu Mar 14 23:26:47 2019 |
Anjali | Update | ALS | ALS delay line electronics | Attachment #1 shows the schematic of the
test setup. Signal generator (Marconi) was
used to supply the RF input. We observed |
|
|
14478
|
Wed Mar 13 01:27:30 2019 |
gautam | Update | ALS | ALS delay line electronics | This test was done, and I determine the
frequency discriminant to be |
|
|
14477
|
Tue Mar 12 22:51:25 2019 |
gautam | Update | ALS | ALS delay line electronics | This
Hanford alog may be of relevance as we
are using the aLIGO AA chassis for the IR |
|
|
14476
|
Fri Mar 8 08:40:26 2019 |
Anjali | Configuration | | Frequency stabilization of 1 micron source | The schematic of the homodyne configuration
is shown below.
Following are the list of components |
|
|
14475
|
Thu Mar 7 01:06:38 2019 |
gautam | Update | ALS | ALS delay line electronics | Summary:
The restoration of the delay-line
electronics is complete. The chassis has |
|
|
14474
|
Tue Mar 5 15:56:27 2019 |
gautam | Summary | Tip-TIlt | Discussion points about TT re-design | Chub, Koji and I have been talking about
Udit's re-design. Here are a few points
that were raised. Chub/Koji can add to/correct |
|
|
14473
|
Sun Mar 3 14:16:31 2019 |
gautam | Update | IOO | Megatron hard-rebooted | IMC was not locked for the past several
hours. Turned out MC autolocker was stuck,
and I could not ssh into megatron because |
|
|
14472
|
Sat Mar 2 14:19:35 2019 |
gautam | Update | CDS | FSS Slow servo gains not burt-ed | PSL NPRO PZT voltage showed large low frequency
(hour timescale) excursions on the control
room StripTool trace, leading me to suspect |
|
|
14471
|
Wed Feb 27 21:34:21 2019 |
gautam | Update | General | Suspension diagnosis | In my effort to understand what's going
on with the suspensions, I've kicked
all the suspensions and shutdown the watchdogs |
|
|
14470
|
Mon Feb 25 20:20:07 2019 |
Koji | Update | SUS | DIN 41612 (96pin) shrouds installed to vertex SUS coil drivers | The forthcoming Acromag c1susaux is
supposed to use the backplane connectors
of the sus euro card modules. |
|
|
14469
|
Fri Feb 22 12:19:46 2019 |
gautam | Update | IOO | TT coil driver Vmon | To debug the issue of the suspected drifting
TTs further, I temporarily hijacked CH0-CH8
of ADC1 in the c1lsc expansion chassis, and |
|
|
14468
|
Wed Feb 20 23:55:51 2019 |
gautam | Update | ALS | ALS delay line electronics | Summary:
Last year, I worked
on the ALS delay line electronics, thinking |
|
|
14467
|
Wed Feb 20 18:26:05 2019 |
gautam | Update | IOO | IPPOS recommissioned | I've suspected that the TTs are drifting
significantly over the course of the last
couple of days, because despite repeated |
|
|
14466
|
Tue Feb 19 22:52:17 2019 |
gautam | Update | ASS | Y arm clipping doubtful | In an earlier
elog, I had claimed that the suspected
clipping of the cavity axis in the Y arm |
|
|
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 |
|
|
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: |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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. |
|
|
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? |
|
|
14457
|
Fri Feb 15 15:22:08 2019 |
gautam | Update | CDS | c1rfm errors persist | I restarted c1scy,
|
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
14452
|
Thu Feb 14 15:37:35 2019 |
gautam | Update | VAC | Vacromag failure | [chub, gautam]
Sumary:
One of the XT1111 units (XT1111a) |
|
|
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 +/- |
|
|
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 |
|
|
14449
|
Tue Feb 12 18:00:32 2019 |
gautam | Summary | Loss Measurement | Loss measurement setup | Another
arm loss measurement started at 6pm. |
|
|
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 |
|
|
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. |
|
|
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 |
|