| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15677
|
Mon Nov 16 00:02:34 2020 |
rana | Update | Electronics | More systematic noise characterization | true. also try to choose a cap with a goow
high frequency response. In the Electronics
Noise book by Ott there's some graph |
|
|
15678
|
Mon Nov 16 16:00:19 2020 |
gautam | Update | Equipment loan | LB1005-->Cryo lab | Shruti picked it up @4pm. |
|
|
15679
|
Tue Nov 17 00:26:32 2020 |
rana | Update | Electronics | SR560s in need of repair/battery replacement | yes, both problems can be fixed. Usually
we just order some spare lead-acid batteries
from SRS (Steve may have some spare ones |
|
|
15680
|
Tue Nov 17 13:24:40 2020 |
Chub | Update | General | big UPS on the way | Ordered 11/16 from CDW, on PO# S492940, the
high voltage Tripp Lite SMART5000XFMRXL |
|
|
15681
|
Wed Nov 18 17:51:50 2020 |
gautam | Update | VAC | Agilent pressure gauge controller delivered | It is stored along with the cables that
arrived a few weeks ago, awaiting the gauges
which are now expected next week sometime. |
|
|
15682
|
Wed Nov 18 22:49:06 2020 |
gautam | Update | ASC | Some thoughts about AS WFS electronics | Where do we
want to install the interface and readout |
|
|
15683
|
Sun Nov 22 21:09:37 2020 |
gautam | Update | ASC | Planned mods for WFS head | Attachment
#1 - Proposed mods |
|
|
15684
|
Mon Nov 23 12:25:14 2020 |
gautam | Update | BHD | BHD MMT Optics delivered | Optics --> Cabinet at south end (Attachment #1) |
|
|
15685
|
Mon Nov 23 14:52:10 2020 |
Koji | Update | BHD | BHD MMT Optics delivered | Basically, they repeated our specs and
showed the coating performances for HR/AR
for 10deg P and PR/AR for 45deg P. There |
|
|
15686
|
Mon Nov 23 16:33:10 2020 |
gautam | Update | VAC | More vacuum deliveries | Five Agilent pressure gauges were delivered
to the 40m. It is stored with the controller
and cables in the office area. This completes |
|
|
15688
|
Tue Nov 24 16:51:29 2020 |
gautam | Update | PonderSqueeze | Ponderomotive squeezing in aLIGO | Summary:
On the call last week, I claimed
that there isn't much hope of directly |
|
|
15689
|
Wed Nov 25 18:18:41 2020 |
gautam | Update | ASC | Planned mods for WFS head | I am confused by the discussion during
the call today. I revisited Hartmut's
paper - the circuit in Fig 6 is essentially |
|
|
15690
|
Wed Nov 25 18:30:23 2020 |
gautam | Update | ASC | Some thoughts about AS WFS electronics | An 8 channel whitening chassis was prepared
and tested. I measured:
TF from input to output |
|
|
15691
|
Sat Nov 28 21:44:53 2020 |
rana | Update | ASC | Planned mods for WFS head | I don't think your simulation looked
inaccurate (at least not to me). In my opinion,
we just want to minimize any excess noise |
|
|
15692
|
Wed Dec 2 12:27:49 2020 |
Jon | Update | VAC | Replacing pressure gauges | Now that the new Agilent full-range gauges
(FRGs) have been received, I'm putting
together an installation plan. Since |
|
|
15695
|
Wed Dec 2 17:54:03 2020 |
gautam | Update | CDS | FE reboot | As discussed at the meeting, I commenced
the recovery of the CDS status at 1750 local
time. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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) |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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) |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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? |
|
|
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. |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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. |
|
|
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. |
|