| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15659
|
Wed Nov 4 17:14:49 2020 |
gautam | Update | CDS | c1bhd setup | I am working on the setup of a CDS FE,
so please do not attempt any remote
login to the IPMI interface of c1bhd |
|
|
15660
|
Thu Nov 5 22:27:34 2020 |
gautam | Update | General | Vent activities today | [koji, gautam]
Tweaked last steering mirror
before PSL beam is launched into vacuum to |
|
|
15661
|
Fri Nov 6 11:36:37 2020 |
gautam | Update | General | ETMY suspension eigenmodes | Attachment
#1 shows the main |
|
|
15662
|
Fri Nov 6 14:08:44 2020 |
gautam | Update | PSL | PMC re-locked | The PMC servo railed and so I re-locked
it at ~half range. I've been noticing
that the diurnal drift of the PZT control |
|
|
15663
|
Fri Nov 6 14:27:16 2020 |
gautam | Update | CDS | c1bhd setup - diskless boot | I was able to boot one of the 3 new Supermicro
machines, which I christened c1bhd, in a
diskless way (with the boot image hosted |
|
|
15664
|
Sun Nov 8 20:22:35 2020 |
gautam | Update | General | Vent activities today | Basic IFO alignment checks were done.
IMC could be locked - I
tweaked the cavity alignment a little to |
|
|
15665
|
Sun Nov 8 23:24:29 2020 |
Koji | Update | General | Vent activities today | > I didn't bother to align the green
beams to the arm cavities or re-center the
Oplevs - is this necessary? It is a step |
|
|
15666
|
Mon Nov 9 17:40:17 2020 |
gautam | Update | General | Pumpdown | [koji, rana, gautam]
1100 - EY chamber inspected, no
issues were found --> EY heavy door on |
|
|
15667
|
Tue Nov 10 11:31:13 2020 |
Koji | Update | General | Pumpdown | Main volume pressure as of 11:30AM 2020/11/10 |
|
|
15668
|
Tue Nov 10 11:59:37 2020 |
gautam | Update | VAC | Stuck RV2 | I've uploaded some more photos here.
I believe the problem is a worn out thread
where the main rotary handle attaches to |
|
|
15669
|
Tue Nov 10 12:41:23 2020 |
gautam | Update | IOO | 1W —> IMC | Looking back through the elog, 1mtorr is
the pressure at which it is deemed safe to
send the full power beam into the IMC. After |
|
|
15670
|
Tue Nov 10 14:30:06 2020 |
gautam | Update | IOO | WFS2 broken | While proceeding with the interferometer
recovery, I noticed that there appeared to
be no light on WFS2. I confirmed on the AP |
|
|
15671
|
Tue Nov 10 15:13:41 2020 |
rana | Update | General | ETMY suspension eigenmodes | For the input matrix diagonalization, it
seemed to me that when we had a significant
seismic event or a re-alignment of the optic |
|
|
15672
|
Tue Nov 10 17:46:06 2020 |
gautam | Update | General | IFO recovery | Summary:
Recovery was complicated
by RFM failure on c1iscey - see |
|
|
15673
|
Thu Nov 12 14:26:35 2020 |
gautam | Update | General | ETMY suspension eigenmodes | The results from the ringdown are attached
- in summary:
The peak positions have |
|
|
15674
|
Thu Nov 12 14:31:27 2020 |
gautam | Update | Electronics | SR560s in need of repair/battery replacement | I had to go through five SR560s
in the lab yesterday evening to find one
that had the expected 4 nV/rtHz input noise |
|
|
15675
|
Thu Nov 12 14:55:35 2020 |
gautam | Update | Electronics | More systematic noise characterization | Summary:
I now think the excess noise in
this circuit could be coming from the KEPCO |
|
|
15676
|
Thu Nov 12 15:40:42 2020 |
Koji | Update | Electronics | More systematic noise characterization | Yes. The datasheet has a recommendation
circuit with 10uF caps. Companies are careful
to show reproducible, reliably functional |
|
|
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 |
|