ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
14953
|
Tue Oct 8 17:59:29 2019 |
Koji | Update | CDS | CM servo board testing (portal) | == Test Status ==
[done]
Whitening gain switching test |
6x |
14952
|
Tue Oct 8 16:54:56 2019 |
rana | Update | IOO | IMC locking not working after this work | I think this offset setting thing is not
so good. People do this every few years,
but putting offsets in servos means that |
|
14951
|
Tue Oct 8 16:00:06 2019 |
aaron | Update | Electronics | WFS head RF measurements | I simulated this
circuit with zero, but haven't gotten
the results to match the measurements above. |
 |
14950
|
Tue Oct 8 10:29:19 2019 |
gautam | Update | IOO | MC Transmission scan | Summary:
There is ~ 7% variation
in the power seen by the MC2 trans QPD, depending |
  |
14949
|
Tue Oct 8 08:08:18 2019 |
gautam | Update | PEM | PEM BLRMS anomaly | Yesterday, Koji and I noticed (from the
wall StripTool traces) that the vertex seismometer
RMS between 0.1-0.3 Hz in the X-direction |
|
14948
|
Tue Oct 8 03:32:42 2019 |
Koji | Update | CDS | CM servo board testing | [Koji]
The logic chips 74ALS573
were replaced. And now the gain sliders are |
7x |
14947
|
Tue Oct 8 03:19:14 2019 |
Koji | Update | CDS | Final incarnation of latch.py | Now with the CM board tested with the signal
injected, it turned out that the latch logic
was flipped. As the default state locked |
|
14946
|
Mon Oct 7 19:50:33 2019 |
gautam | Update | IOO | IMC locking not working after this work | See trend. This is NOT symptomatic of some
frozen slow machine - if I disable the WFS
servo inputs, the lock holds just fine. |
 |
14945
|
Mon Oct 7 14:51:20 2019 |
aaron | Update | Electronics | WFS head RF measurements | Mon Oct 7 14:51:53 2019. I closed the PSL
shutter to measure the WFS head responsivity.
I made a thru calibration as in |
|
14944
|
Sun Oct 6 15:23:27 2019 |
gautam | Update | ALS | Arm control using error signals achieved | Summary:
I |
  |
14943
|
Sat Oct 5 21:26:34 2019 |
gautam | Update | ALS | Y-end green alignment tweaked | Summary:
I improved the alignment of the
green beam into the Y arm cavity. |
 |
14942
|
Sat Oct 5 00:03:21 2019 |
Koji | Update | CDS | c1iscaux testing | [Gautam, Koji]
Input gain part of the
CM servo board D1500308 |
   |
14941
|
Fri Oct 4 22:22:03 2019 |
gautam | Update | CDS | Final incarnation of latch.py | [KA, GV]
This elog is meant to be a summary
of some of the many subtleties |
|
14940
|
Fri Oct 4 14:25:59 2019 |
aaron | Update | General | Make the Jenne-laser setup fiber-coupled | Summary:
The fiber-coupled
PD seems to have a factor of ~1.5 difference
in responsivity compared to the free-space |
  |
14939
|
Fri Oct 4 01:57:09 2019 |
Koji | Update | CDS | c1iscaux testing | The AA filter for ASDC was fixed.
== Test Status ==
[done] |
   |
14938
|
Fri Oct 4 00:32:24 2019 |
gautam | Update | ALS | More locking updates | Summary:
I managed to achieve a few transitions
of control of the XARM length using the ALS |
 |
14937
|
Fri Oct 4 00:30:31 2019 |
gautam | Update | General | Make the Jenne-laser setup fiber-coupled | I think the metric of interest here is
the consistency of the AC transimpedance
of the proposed new "Reference PD" |
|
14936
|
Thu Oct 3 23:15:39 2019 |
Koji | Update | General | Make the Jenne-laser setup fiber-coupled | The 1GHz PD has a bit more flat response,
but the laser and the driving network have
more frequency dependence as you saw. |
|
14935
|
Thu Oct 3 21:50:22 2019 |
rana | Update | Computers | rossa revival | Got the network to work again just by unplugging
the power cord and letting it sit for awhile.
But corrupted OS by trying to install Nvidia |
|
14934
|
Thu Oct 3 21:05:04 2019 |
aaron | Update | General | Make the Jenne-laser setup fiber-coupled | I measured the RF response of the fiber-coupled
NewFocus 1611, calibrating out the cable
delay. The laser current was set to 20.0 |
|
14933
|
Thu Oct 3 19:40:18 2019 |
gautam | Update | LSC | POX/POY imbalance | Summary:
There is an imbalance between
the POX and POY detector outputs reported |
|
14932
|
Thu Oct 3 14:54:33 2019 |
Koji | Update | General | Make the Jenne-laser setup fiber-coupled | I'm afraid that the RF modualtion of
the laser is nonlinear and the electrical
and optical resoponse is dependent on the |
|
14931
|
Thu Oct 3 14:32:37 2019 |
rana | Update | General | Make the Jenne-laser setup fiber-coupled | I'm
curious to see if we really need the 1611,
or if we can calibrate the diode laser vs. |
|
14930
|
Thu Oct 3 12:08:47 2019 |
gautam | Update | General | Make the Jenne-laser setup fiber-coupled | I propose the following re-organization
of the PDFR measurement breadboard. We have
all the parts on hand, just needs ~30mins |
 |
14929
|
Thu Oct 3 11:38:35 2019 |
aaron | Update | IOO | WFS measurements | I set up the spectrum analyzer to make
the WFS head RF transfer function measurement
(V/W) on WFS1. I placed the Jenne laser on |
|
14928
|
Thu Oct 3 11:01:18 2019 |
rana | Update | LSC | (PR)FPMI locking | wonder if its possible to do variable finesse
locking
Gabriele mentioned that Virgo used |
|
14927
|
Wed Oct 2 23:23:02 2019 |
gautam | Update | CDS | c1oaf DC indicator needs to be green | Today, I found out that this type of "0x2bad"
DC error is connected to the 1e+20 cts output.
The solution was to bite the bullet and stop/start |
|
14926
|
Wed Oct 2 23:15:02 2019 |
gautam | Update | LSC | FPMI locking | Summary:
I was able to lock the FPMI. The
lock was quite stable. However, |
|
14925
|
Wed Oct 2 20:45:18 2019 |
rana | Update | Computers | rossa revival | Formatted and re-installing OS on rossa
for the 3rd or 4th time this year. I suggest
that whoever is installing software |
|
14924
|
Wed Oct 2 11:52:16 2019 |
gautam | Update | LSC | PRMI Oplev loop checkout | I measured the OLTF of both the PRM Oplev
loops. Nothing odd sticks out as odd to me
in this measurement - there seems to be ~40 |
|
14923
|
Wed Oct 2 10:50:20 2019 |
gautam | Update | CDS | Anaconda updated | The anaconda distribution used by the control
room workstations is actually installed on
the shared drive (/cvs/cds/ligo/apps/anaconda/) |
|
14922
|
Wed Oct 2 10:40:07 2019 |
gautam | Update | CDS | c1oaf model restarted | This morning, I restarted the c1oaf
model on the |
|
14921
|
Wed Oct 2 01:11:40 2019 |
Koji | Update | CDS | c1iscaux testing | I worked on more troubleshooting
of the whitening filters Tuesday afternoon
== Test Status == |
8x |
14920
|
Tue Oct 1 21:19:51 2019 |
gautam | Update | LSC | PRMI locked on carrier | Summary:
The |
|
14919
|
Tue Oct 1 18:35:12 2019 |
gautam | Update | General | Beam centering campaign |
With TRX and TRY maximized using
ASS, I centered the Oplev spots on the respective
QPDs for the four test masses and the BS. |
|
14918
|
Mon Sep 30 18:20:26 2019 |
gautam | Update | ALS | ALS OOL noise - a first look | Attachment #1 shows a
first look at the IR ALS noise after my re-coupling |
|
14917
|
Mon Sep 30 17:04:30 2019 |
gautam | Update | CDS | Some path changes | I made some model changes to c1lsc. To
propagate the changes, I tried the usual
rtcds make sequence. But I got an error about |
|
14916
|
Mon Sep 30 15:51:59 2019 |
gautam | Update | CDS | c1iscaux - some admin | I did the following:
symlinked |
|
14915
|
Mon Sep 30 14:16:43 2019 |
gautam | Update | LSC | POX PD checkout - solved | I confirmed that there is light incident
on the POX photodiode. So the problem must
lie downstream in the demod / whitening / |
|
14914
|
Mon Sep 30 13:20:55 2019 |
aaron | Update | IOO | shot noise measurement | I wanted to measure the RF transimpedance
of the WFS heads, as outlined above.
Summary: Measurement is not done. |
|
14913
|
Mon Sep 30 11:42:36 2019 |
aaron | Update | Computers | control rm wkstns shutdown | I booted Rossa in rescue mode; though I
see no errors on bootup, I still see the
same error ("a problem has occurred") |
|
14912
|
Mon Sep 30 11:20:43 2019 |
gautam | Update | CDS | c1iscaux testing - CM board code updated | DATED, SEE |
|
14911
|
Sun Sep 29 16:08:25 2019 |
gautam | Update | Optical Levers | ETMX Oplev HeNe replaced | To facilitate POX locking investigations,
I replaced this HeNe today with one of the
spares Chub/Steve had acquired some time |
|
14910
|
Sun Sep 29 15:58:19 2019 |
gautam | Update | LSC | POX locking attempt | Summary:
There is no visible PDH error signal
on the POX11 channels. As a result, I am |
|
14909
|
Fri Sep 27 15:59:53 2019 |
gautam | Update | CDS | c1iscaux testing | I reset the normalization for both arms on
Jul 9 2019. |
|
14908
|
Thu Sep 26 20:09:40 2019 |
Koji | Update | CDS | c1iscaux testing | == Test Status ==
[done]
Whitening gain switching test => |
    |
14907
|
Thu Sep 26 17:56:28 2019 |
Koji | Update | CDS | some rebooting | Yesterday (Sep 25) evening: I had to reboot
c1psl, c1iool0, and c1aux to recover nominal
IMC locking |
|
14906
|
Wed Sep 25 20:10:13 2019 |
Koji | Update | CDS | c1iscaux testing | == Test Status ==
[none]
Whitening gain switching test |
 |
14905
|
Mon Sep 23 10:49:34 2019 |
rana | Update | CDS | c1iscaux testing |
I'd say permanently enable
AA and AI. There's no reason to turn
these off for usual channels. We can always |
|
14904
|
Fri Sep 20 18:28:34 2019 |
gautam | Update | LSC | Y arm locking attempt | I tried to lock the Y arm cavity length
to the PSL frequency using POY11_I as an
error signal. Even though I think the cavity |
|