| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15748
|
Wed Jan 6 15:28:04 2021 |
gautam | Update | VAC | Vac rack UPS batteries replaced | [chub, gautam]
the replacement was done this afternoon.
The red "Replace Battery" indicator |
|
|
15747
|
Sun Jan 3 16:26:06 2021 |
Koji | Update | SUS | IMC WFS check (Yet another round of Sat. Box. switcharoo) | I wanted to check the functionality of
the IMC WFS. I just turned on the WFS servo
loops as they were. For the past two hours, |
|
|
15746
|
Wed Dec 23 23:06:45 2020 |
gautam | Configuration | CDS | Updated CDS upgrade plan |
The diagram should clearly show
the host machines and the expansion chassis
and the interconnects between them.
We |
|
|
15745
|
Wed Dec 23 10:13:08 2020 |
gautam | Update | CDS | Near term upgrades | Summary:
There appears to be insufficient |
|
|
15744
|
Tue Dec 22 22:11:37 2020 |
gautam | Update | CDS | AA filt repaired and reinstalled | Koji fixed the problematic channel - the
issue was a bad solder joint on the input
resistors to the THS4131. The board was re-installed. |
|
|
15743
|
Mon Dec 21 18:18:03 2020 |
gautam | Update | CDS | Many model changes | The CDS model change required to get the
AS WFS signals into the RTCDS system are
rather invasive. |
|
|
15742
|
Mon Dec 21 09:28:50 2020 |
Jamie | Configuration | CDS | Updated CDS upgrade plan |
Quote:
|
|
|
15741
|
Sat Dec 19 20:24:25 2020 |
gautam | Update | Electronics | WFS hardware install | I installed 4 chassis in the rack 1X2 (characterization
on the E-bench was deemed satisfactory, I
will upload the analysis later). I ran out |
|
|
15740
|
Sat Dec 19 02:42:56 2020 |
Koji | Update | | New SMA cables on order | Our favorite (flexible) RF cable is Belden's
1671J (Jacketed solder-soaked coax cable).
It is compatible RG405. I'm not sure |
|
|
15739
|
Sat Dec 19 00:25:20 2020 |
Jon | Update | | New SMA cables on order | I re-ordered the below cables, this
time going with flexible, double-shielded
RG316-DS. |
|
|
15738
|
Fri Dec 18 22:59:12 2020 |
Jon | Configuration | CDS | Updated CDS upgrade plan | Attached is the layout for the "intermediate"
CDS upgrade option, as was discussed on Wednesday.
Under this plan: |
|
|
15737
|
Fri Dec 18 10:52:17 2020 |
gautam | Update | CDS | RFM errors | As I was working on the IFO re-alignment
just now, the rfm errors popped up again.
I don't see any useful diagnostics on |
|
|
15736
|
Thu Dec 17 15:23:56 2020 |
gautam | Update | ASC | WFS head characterization | Summary:
I think the WFS head performs satisfactorily.
The (input-referred) dark |
|
|
15735
|
Tue Dec 15 12:38:41 2020 |
gautam | Update | Electronics | DC power strip | I installed a DC power strip (24 V
variant, 12 outlets available) on the NW
upright of the 1X1 rack. This is for the |
|
|
15734
|
Mon Dec 14 11:09:28 2020 |
Yehonathan | Update | BHD | Monte Carlo loop coupling Simulations | I spent a few hours monkeying around with
the control filters. They are totally made
up and also it's my first time trying |
|
|
15732
|
Fri Dec 11 09:28:52 2020 |
rana | Update | BHD | Monte Carlo loop coupling Simulations | Cool. Can you give us Bode plots of the
open loop gain for each of the 5 length control
loops? |
|
|
15731
|
Thu Dec 10 22:46:57 2020 |
gautam | Update | ASC | WFS head assembled | The assembly of the head is nearly complete,
I thought I'd do some characterization
before packaging everything up too nicely. |
|
|
15730
|
Thu Dec 10 22:45:42 2020 |
gautam | Update | SUS | More spare OSEMs | I acquired several spare OSEMs (in unknown
condition) from Paco. They are stored alongside
the shipment from UF. |
|
|
15729
|
Thu Dec 10 17:12:43 2020 |
Jon | Update | | New SMA cables on order | As requested, I placed an order for an
assortment of new RF cables: SMA male-male,
RG405. |
|
|
15728
|
Thu Dec 10 16:24:13 2020 |
gautam | Update | Equipment loan | Noliac PZT --> Paco | I gave one Noliac PZT from the two spare
in the metal PMC kit to Paco. There is one
spare left in the kit. |
|
|
15727
|
Thu Dec 10 14:48:00 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I have rebuilt the MCMC simulation in an
OOP fashion and incorporated Lance/Pytickle
functionality into it. The usage of the MCMC |
|
|
15725
|
Thu Dec 10 14:29:26 2020 |
gautam | Update | VAC | UPS failure | I don't buy this story - P2 only briefly
burped around GPStime 1291608000 which is
around 8pm local time, which is when I was |
|
|
15724
|
Thu Dec 10 13:05:52 2020 |
Jon | Update | VAC | UPS failure | I've investigated the vacuum controls
failure that occurred last night. Here's
what I believe happened. |
|
|
15723
|
Thu Dec 10 11:17:50 2020 |
Chub | Update | VAC | UPS fault | I can't find anything in the manual
that describes the nature of the FAULT message.
In fact, it's not mentioned at all. |
|
|
15722
|
Thu Dec 10 11:07:24 2020 |
Chub | Update | VAC | UPS fault | Is that a fault code that you can decipher
in the manual, or just a light telling you
nothing but your UPS is dead? |
|
|
15721
|
Wed Dec 9 20:14:49 2020 |
gautam | Update | VAC | UPS failure | Summary:
The (120V) UPS at the vacuum
rack is faulty.
The drypump backing |
|
|
15720
|
Wed Dec 9 16:22:57 2020 |
gautam | Update | SUS | Yet another round of Sat. Box. switcharoo | As discussed at the meeting, I decided
to effect a satellite box swap for the misbehaving
MC1 unit. I looked back at the summary pages |
|
|
15719
|
Wed Dec 9 15:37:48 2020 |
gautam | Update | CDS | RFM switch IP addr reset | I suspect what happened here is that the
IP didn't get updated when we went from
the 131.215.113.xxx system to 192.168.113.xxx |
|
|
15718
|
Wed Dec 9 12:02:04 2020 |
gautam | Update | LSC | POX locking still unsatisfactory | Continuting the IFO recovery - I am unable
to recover similar levels of TRX RIN as I
had before. |
|
|
15717
|
Wed Dec 9 11:54:11 2020 |
gautam | Update | Optical Levers | ITMX HeNe replaced | The ITMX Oplev (installed in March 2019)
was near end of life judging by the SUM channel
(see |
|
|
15716
|
Tue Dec 8 15:07:13 2020 |
gautam | Update | Computer Scripts / Programs | ndscope updated | I updated the ndscope on rossa to a bleeding
edge version (0.7.9+dev0) |
|
|
15715
|
Mon Dec 7 22:54:30 2020 |
gautam | Update | LSC | Modulation depth measurement | Summary:
I measured the modulation depth
at 11 MHz andf 55 MHz using an optical beat |
|
|
15714
|
Mon Dec 7 14:32:02 2020 |
gautam | Update | LSC | New demod phases for POX/POY locking | In favor of keeping the same servo gains,
I tuned the digital demod
phases for the POX and POY photodiode signals |
|
|
15713
|
Mon Dec 7 12:38:51 2020 |
gautam | Update | IOO | IMC loop char | Summary:
There seems to be significant phase
loss in the TTFSS path, which is limiting |
|
|
15712
|
Mon Dec 7 11:25:31 2020 |
gautam | Update | SUS | MC1 suspension glitchy again | The MC1 suspension has begun to show
evidence of glitches again, from Friday/Saturday.
You can look at the suspension Vmon tab a |
|
|
15711
|
Sat Dec 5 20:44:35 2020 |
gautam | Update | ASC | Freq Gen Box re-installed | This work is now complete. The box was
characterized and re-installed in 1X2. I
am able to (briefly) lock the IMC and see |
6x |
|
15710
|
Fri Dec 4 22:41:56 2020 |
gautam | Update | ASC | Freq Gen Box revamp | This turned out to be a much more involved
project than I expected. The layout is complete
now, but I found several potentially damaged |
|
|
15709
|
Fri Dec 4 19:23:40 2020 |
Koji | Update | Electronics | AA/AI board testing ongoing | I have the setup built for the AA/AI board
testing around the PD testing area. Please
let me leave it like that for a week or so. |
|
|
15708
|
Fri Dec 4 15:58:22 2020 |
Koji | Update | IOO | WFS2 broken | I checked the backplane connection for
IMC WFS2 and found that the
cables for IMC WFS2 and the IMC demod were |
|
|
15707
|
Fri Dec 4 03:02:40 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | 1. That's true. But we are already
in that regime with the Var attn at 0dB,
aren't we? We can reduce the input to |
|
|
15706
|
Thu Dec 3 21:44:49 2020 |
gautam | Update | ASC | Electrical LO signal for AS WFS | I'm open to either approach. If the
full replacement requires a lot of machining,
maybe I will stick to just the 55 MHz line. |
|
|
15705
|
Thu Dec 3 21:14:38 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | Let's use RG405 for better shielding.
It is not too stiff. The bending (just
once) does not break the cable. |
|
|
15704
|
Thu Dec 3 20:38:46 2020 |
gautam | Update | ASC | Electrical LO signal for AS WFS | I removed the Frequency Generation box
from the 1X2 rack. For the time being, the
PSL shutter is closed, since none of the |
|
|
15703
|
Thu Dec 3 14:53:58 2020 |
Jon | Update | VAC | Replacing pressure gauges | Update to the gauge replacement plan (15692),
based on Jordan's walk-through today. |
|
|
15702
|
Thu Dec 3 13:55:52 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | I got a bit confused by your description.
The demod board claims
that the nominal power at each LO port is |
|
|
15700
|
Thu Dec 3 11:02:35 2020 |
rana | Update | Electronics | Electrical LO signal for AS WFS | looks good to me.
The thing I usually look for is
how much the downstream system (mixers, etc) |
|
|
15699
|
Thu Dec 3 10:46:39 2020 |
gautam | Update | Electronics | DC power strip requirements | Since we will have several new 1U / 2U
aLIGO style electronics chassis installed
in the racks, it is desirable to have a more |
|
|
15698
|
Thu Dec 3 10:33:00 2020 |
gautam | Update | VAC | TrippLite UPS delivered | The latest greatest UPS has been delivered.
I will move it to near the vacuum rack in
its packaging for storage. It weighs >100lbs |
|
|
15697
|
Wed Dec 2 23:07:19 2020 |
gautam | Update | ASC | Electrical LO signal for AS WFS | I'm thinking of making some modifications
to the RF distribution box in 1X2, so as
to have an extra 55 MHz pickoff. Koji already |
|
|
15696
|
Wed Dec 2 18:35:31 2020 |
gautam | Update | DetChar | Summary page revival | The summary pages were in a sad state of
disrepair - the daily jobs haven't been
running for > 1 month. I only noticed |
|