| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15809
|
Tue Feb 16 14:56:44 2021 |
gautam | Update | SUS | aLIGO Sat Amp installed, powered | [jordan,
gautam]
Ran 60ft long cables from |
|
|
15808
|
Tue Feb 16 13:13:39 2021 |
Yehonathan | Update | BHD | SOS assembly | Gautam pointed out that there are extra
Sm-Co magnets stored in the clean optics
cabinet. |
|
|
15806
|
Fri Feb 12 15:03:48 2021 |
Jordan | Update | SUS | CoM on 3"->2" Adapter Ring for SOS | As it currently stands the Center of Mass
of the Adapter Ring/Optic assembly is 0.0175"
out of the plane formed by the suspension |
|
|
15805
|
Thu Feb 11 18:21:39 2021 |
gautam | Update | SUS | MC suspension glitches | MC1
suspension is glitching again, so
this is a good chance to install the new |
|
|
15804
|
Thu Feb 11 16:58:52 2021 |
rana | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | I expect that a single OSEM channel can't
be better than 1e-10 m/rHz above 5 Hz, so
probably something wrong in the calibration. |
|
|
15803
|
Thu Feb 11 11:10:05 2021 |
Anchal | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | Here is a proper measurement for PD transimpedance
amplifier circuit in the Satellite amplifier
box D1002818 S2100029. The input from rear |
|
|
15802
|
Wed Feb 10 21:14:03 2021 |
gautam | Update | Electronics | Production version of the HV coil driver tested | Summary:
I did what I consider to be a comprehensive
set of tests on the production version of |
|
|
15801
|
Wed Feb 10 17:18:03 2021 |
Koji | Summary | BHD | Satellite Amplifier Output Offset measurements | Testing the satellite amp i.e.
PD driver
- To test the noise of the PD transimpedance |
|
|
15800
|
Wed Feb 10 15:25:45 2021 |
gautam | Summary | BHD | Satellite Amplifier Output Offset measurements | Why not just do this test with the dummy
suspension box and CDS system? I think Rich's
claim was that the intrinsic LED RIN was |
|
|
15799
|
Wed Feb 10 15:07:50 2021 |
Anchal | Summary | BHD | Satellite Amplifier Output Offset measurements | I measured the output DC voltage of the
satellite amplifier box at PDMon port when
the PDA input was shorted |
|
|
15798
|
Wed Feb 10 14:14:58 2021 |
gautam | Update | Electronics | Custom cables received | We received the custom cables to test the
new suspension electronics. They are under
my desk. So we are ready. |
|
|
15797
|
Wed Feb 10 11:45:59 2021 |
Anchal | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | As suggested, I wrapped the satellite amplifier
box D10028128 S2100029 in blanket and foam
and took very low frequency spectrum starting |
6x |
|
15796
|
Thu Feb 4 15:14:55 2021 |
Yehonathan | Update | BHD | SOS assembly | I gathered all the components I could find
from the SOS towers and the cleanroom and
put it all on the table next to the flow |
|
|
15795
|
Wed Feb 3 21:28:02 2021 |
gautam | Update | CDS | CDS crash and CDS/IFO recovery | I am just reporting my experience - this
may be a new failure mode but I don't
think so. In the new RTCDS, the ntp server |
|
|
15794
|
Wed Feb 3 18:53:31 2021 |
Koji | Update | CDS | CDS crash and CDS/IFO recovery | Really!? I didn't reboot the machines
between "sudo date" and "rtcds
start c1x0*". I tried rtcds. If it didn't |
|
|
15793
|
Wed Feb 3 16:27:19 2021 |
Anchal | Summary | BHD | Satellite Amplifier Transfer Functions and noise After modifications | I have made modifications recommended in
this doc.
The changes made are: |
|
|
15792
|
Wed Feb 3 15:24:52 2021 |
gautam | Update | CDS | CDS crash and CDS/IFO recovery | Didn't get a chance to comment during the
meeting - This was almost certainly
a coincidence. I have never had to do |
|
|
15791
|
Tue Feb 2 23:29:35 2021 |
Koji | Update | CDS | CDS crash and CDS/IFO recovery | I worked around the racks and the feedthru
flanges this afternoon and evening. This
inevitably crashed c1lsc real-time process. |
|
|
15790
|
Tue Feb 2 18:24:54 2021 |
Koji | Update | BHD | SOS assembly | You can remove the components of the optical
table enclosure (black ones) and use the
optical table as your working area too. |
|
|
15788
|
Tue Feb 2 17:09:17 2021 |
yehonathan | Update | BHD | SOS assembly | I set up a working area on the table next
to the south flow bench (see attachment).
I also brought in a rolling table for some |
|
|
15787
|
Tue Feb 2 11:57:46 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements After modifications TF and Noise S2100028 | I have made the modifications on the other
board D1100687 S2100028 as well. The measurements
were taken as mentioned in 40m/15784. |
|
|
15786
|
Mon Feb 1 12:30:21 2021 |
gautam | Update | Electronics | More careful characterization | Summary:
Swapping out the KEPCO
HV supplies (linear) I was using for a pair |
|
|
15785
|
Fri Jan 29 17:57:17 2021 |
Anchal | HowTo | CDS | Acromag wiring investigation | I found a
white paper from Acromag which
discusses how to read differential signal |
|
|
15784
|
Fri Jan 29 15:39:30 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements After modifications TF and Noise S2100027 | I fitted zeros and poles in the measured
transfer function of D1100687 S2100027 and
got zeros at 130 Hz and 234 Hz and poles |
|
|
15783
|
Thu Jan 28 22:34:21 2021 |
gautam | Update | SUS | De-whitening | Summary:
We will need de-whitening
filters for the BHD relay optics in order |
|
|
15782
|
Thu Jan 28 21:44:45 2021 |
gautam | Summary | BHD | HAM-A Coil Driver measurements After modifications | Looks fine to me visually but the verdict
can only be made once the z:p locations are quantitatively confirmed,
and the noise tests pass. It would be interesting |
|
|
15781
|
Thu Jan 28 18:04:55 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements After modifications | I did the recommended
modifications on of the boards with serial
number S2100028. These included: |
|
|
15780
|
Thu Jan 28 12:53:14 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements before modifications | I took some steps to reduce the coupling
of 60 Hz harmonics in noise measurement.
The box was transferred to the floor instead |
|
|
15779
|
Tue Jan 26 15:37:25 2021 |
Anchal | HowTo | CDS | Acromag wiring investigation | Here I present few wiring diagrams when
using Acromag to avoid noisy behavior and
ground loops. |
|
|
15778
|
Tue Jan 26 12:59:51 2021 |
Anchal | HowTo | CDS | Acromag wiring investigation | Taking inspiration from SR785 on how it
reads differential signal, I figured that
acromag too always need a way to return current |
|
|
15777
|
Tue Jan 26 10:58:30 2021 |
gautam | Update | SUS | MC2 tickler stuck on | For whatever reason, the autolocker didn't
turn the tickle off for several
hours. Seems to work okay now. The linked |
|
|
15776
|
Mon Jan 25 18:18:04 2021 |
Anchal | Summary | BHD | Satellite Amplifier Transfer Functions and noise |
I took transfer function and noise
measurement of satellite amplifier box's |
|
|
15775
|
Wed Jan 20 19:12:16 2021 |
gautam | Update | CDS | SLwebview fixed | After fixing multiple issues, the model
webviews are updating, should be done
by tomorrow. It should be obvious from the |
|
|
15774
|
Wed Jan 20 18:07:09 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements before modifications | I have taken transfer functions and noise
measurements of the two HAM-A coil driver
boxes D1100687 #S2100027 and #S2100028. All |
7x |
|
15773
|
Wed Jan 20 10:13:06 2021 |
gautam | Update | Electronics | HV Power supply bypassing | Summary:
Installing 10uF bypass capacitors
on the High |
|
|
15772
|
Tue Jan 19 15:43:24 2021 |
gautam | Configuration | CDS | Updated CDS upgrade plan | Not sure if 1Y1 can accommodate both c1sus2
and c1bhd as well as the various electronics
chassis that will have to be installed. There |
|
|
15771
|
Tue Jan 19 14:05:25 2021 |
Jon | Configuration | CDS | Updated CDS upgrade plan | I've produced updated diagrams of the
CDS layout, taking the comments in 15476 into |
|
|
15770
|
Tue Jan 19 13:19:24 2021 |
Jon | Update | CDS | Expansion chassis from LHO | Indeed T1800302 is
the document I was alluding to, but I completely
missed the statement about >3 GHz speed. |
|
|
15769
|
Sat Jan 16 18:59:44 2021 |
gautam | Update | LSC | Modulation depth measurement | I decided to analyze the data I took in
December more carefully to see if there are
any clues about the weird LSC sensing. |
|
|
15768
|
Fri Jan 15 17:04:45 2021 |
gautam | Update | LSC | Messed up LSC sensing | I want to lock the PRFPMI again (to commission
AS WFS). Have had some
success - but in doing characterization, |
|
|
15767
|
Fri Jan 15 16:54:57 2021 |
gautam | Update | CDS | Expansion chassis from LHO | Can you please provide a link to this "list
of boards"? The only document I can
find is T1800302. |
|
|
15766
|
Fri Jan 15 15:06:42 2021 |
Jon | Update | CDS | Expansion chassis from LHO | Koji asked me assemble a detailed breakdown
of the parts received from LHO, which I do
based on the high-res photos |
|
|
15765
|
Thu Jan 14 12:32:28 2021 |
gautam | Update | CDS | Rogue master may be doing something good? | I think the "Rogue
Master" setting on the RFM network
may be doing some good. 5 mins, ago, all |
|
|
15764
|
Thu Jan 14 12:19:43 2021 |
Jon | Update | CDS | Expansion chassis from LHO | That's fine, we didn't actually
request those. We bought and already have
in hand new PCIe x4 cables for the chassis-host |
|
|
15763
|
Thu Jan 14 11:46:20 2021 |
gautam | Update | CDS | Expansion chassis from LHO | I picked the boxes up this morning. The
inventory per Fil's email looks accurate.
Some comments: |
|
|
15762
|
Wed Jan 13 16:09:29 2021 |
Anchal | HowTo | CDS | Acromag wiring investigation | I'm working on a better wiring diagram
that takes into account multiple power supplies,
how their GND is passed forward to the circuits |
|
|
15761
|
Tue Jan 12 11:42:38 2021 |
gautam | HowTo | CDS | Acromag wiring investigation | Thanks for the systematic effort.
Can you please post some
time domain plots (ndscope perferably or |
|
|
15760
|
Tue Jan 12 08:21:47 2021 |
anchal | HowTo | CDS | Acromag wiring investigation | I used an Acromag XT1221 in CTN to play
around with different wiring and see what
works. Following are my findings: |
|
|
15759
|
Mon Jan 11 19:10:10 2021 |
rana | Update | BHD | Monte Carlo loop coupling Simulations |
looking better, but the CARM plot
still looks weird.
you should
plot from 0.01 - 10,000 Hz
All |
|
|
15758
|
Mon Jan 11 16:11:51 2021 |
Yehonathan | Update | BHD | Monte Carlo loop coupling Simulations | I dived into the alog to make the OLTFs
in the MC_controls example more realistic.
I was mainly inspired by these entries: |
|