| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
14483
|
Mon Mar 18 12:27:42 2019 |
gautam | Update | General | IFO status |
c1iscaux2
VME crate is damaged - |
|
|
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 |
|
|
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) |
|
|
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 |
|
|
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. |
|
|
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) |
|
|
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.
|
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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.
|
|
|
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 |
|
|
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 |
|
|
14496
|
Tue Mar 26 04:25:13 2019 |
Johannes | Update | Upgrade | c1susaux upgrade plan |
Quote:
|
|
|
14497
|
Tue Mar 26 18:35:06 2019 |
Jon | Update | Upgrade | Modbus IOC is running on c1susaux2 | Thanks to new
info from Johannes, I was able to finish
setting up the modbus IOC on c1susaux2. |
|
|
14498
|
Thu Mar 28 19:40:02 2019 |
gautam | Update | ALS | BeatMouth with NF1611s assembled | Summary:
The parts I was waiting for arrived.
I finished the beat mouth assembly, and did |
|
|
14499
|
Thu Mar 28 23:29:00 2019 |
Koji | Update | SUS | Suspension PD whitening and I/F boards modified for susaux replacement | Now
the sus PD whitening bards
are ready to move the |
|
|
14500
|
Fri Mar 29 11:43:15 2019 |
Jon | Update | Upgrade | Found c1susaux database bug | I found the current bias output channels,
C1:SUS-<OPTIC>_<DOF>BiasAdj,
were all pointed at C1:SUS-<OPTIC>_ |
|
|
14501
|
Fri Mar 29 15:47:58 2019 |
gautam | Update | AUX | AUX laser fiber moved from AS table to PSL table | [anjali, gautam]
To facilitate the 1um MZ frequency
stabilization project, I decided that the |
|
|
14502
|
Fri Mar 29 21:00:06 2019 |
gautam | Update | ALS | BeatMouth with NF1611s installed |
Newfocus 15V current limited supply
was taken from bottom NE corner of the ITMY
Oplev table to power the BeatMouth on the |
|
|
14503
|
Sun Mar 31 15:05:53 2019 |
gautam | Update | ALS | Fiber beam-splitters not PM | I looked into this a little more today.
Looking at the beat signal
between the PSL and EX beams from the |
|
|
14504
|
Sun Mar 31 18:39:45 2019 |
Anjali | Update | AUX | AUX laser fiber moved from AS table to PSL table |
Attachment #1 shows the schematic
of the experimental setup for the frequency
noise measurement of 1 um laser source. |
|
|
14505
|
Mon Apr 1 12:01:52 2019 |
Jon | Update | CDS | | I brought c1susaux back online this morning
for suspension-channel test scripting. It
had been dead for some time. I followed |
|
|
14506
|
Mon Apr 1 22:33:00 2019 |
gautam | Update | CDS | ITMY freed | While Anjali is working on the 1um MZ setup,
the pesky ITMY was liberated from the OSEMs.
The "algorithm" : |
|
|
14507
|
Tue Apr 2 14:53:57 2019 |
gautam | Update | CDS | c1vac added to burt | I deleted references to c1vac1 and c1vac2
(which no longer exist) and added c1vac to
the autoburt request file list at |
|
|
14508
|
Tue Apr 2 15:02:53 2019 |
Jon | Update | CDS | ITMY freed | |
|
|
14509
|
Tue Apr 2 18:40:01 2019 |
gautam | Update | VAC | Vac failure | While glancing at my |
|
|
14510
|
Wed Apr 3 09:04:01 2019 |
gautam | Update | ALS | Note about new fiber couplers | The new fiber beam splitters we are ordering,
PFC-64-2-50-L-P-7-2-FB-0.3W,
have the slow axis working and fast axis |
|
|
14511
|
Wed Apr 3 09:07:46 2019 |
gautam | Update | VAC | Vac failure | Overnight pressure trends don't suggest
anything went awry after the initial interlock
trip. |
|
|
14512
|
Wed Apr 3 10:42:36 2019 |
gautam | Update | VAC | TP2 forepump replaced | Bob and Chub concluded that the drypump
that serves as TP2's forepump had failed.
Steve had told me the whereabouts of a spare |
|
|
14513
|
Wed Apr 3 12:32:33 2019 |
Koji | Update | ALS | Note about new fiber couplers | Andrew seems to have an integrated solution
of PBS+HWP in a singe mount. Or, I wonder
if we should use HWP/QWP before the coupler. |
|
|
14514
|
Wed Apr 3 16:17:17 2019 |
Jon | Update | VAC | TP2 forepump replaced | I can't explain the mechanical switching
sound Gautam reported. The relay controlling
power to the TP2 forepump is housed in the |
|
|
14515
|
Wed Apr 3 18:35:54 2019 |
gautam | Update | VAC | PSL shutter re-opened | PSL shutter was re-opened at 6pm local
time. IMC was locked. As of 10pm, the main
volume pressure is already back down to the |
|