| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15320
|
Thu May 7 09:43:21 2020 |
rana | Update | ASC | IMC WFS | This
is the doc from Keita Kawabe on why the
WFS heads should be rotated. |
|
|
15325
|
Tue May 12 17:51:25 2020 |
rana | Summary | Computer Scripts / Programs | updated LESS syntax highlight on nodus | apt install source-highlight
then modified bashrc to point to
/usr/share instead of /usr/bin |
|
|
15337
|
Tue May 19 15:24:06 2020 |
rana | Update | BHD | BHD mode-matching study | It would be good to have a corner
plot with all the distances/ RoCs. Also
perhaps a Jacobian |
|
|
15345
|
Fri May 22 10:37:41 2020 |
rana | Update | Computer Scripts / Programs | NDS2 service restarted | was dead again this morning - JZ
notified
current restart instructions (after |
|
|
15346
|
Mon May 25 10:54:41 2020 |
rana | Update | Computer Scripts / Programs | NDS2 service restarted | so far it has run through the weekend with
no problems (except that there are huge log
files as usual). |
|
|
15362
|
Fri May 29 00:34:57 2020 |
rana | Update | LSC | Arm transmission RIN | how bout corner plot with power signals
and oplevs? I think that would show not just
linear couplings (like your coherence), but |
|
|
15425
|
Tue Jun 23 17:54:56 2020 |
rana | Configuration | VAC | Vac maintenance complete | I propose we go for all CAPS for all channel
names. The lower case names is just a holdover
from Steve/Alan from the 90's. All other |
|
|
15435
|
Sun Jun 28 16:29:58 2020 |
rana | Update | SUS | MC1 sat-box de-lidded | does the FLIR have an option to export
image with a colorbar?
How about just leave the lid open? |
|
|
15449
|
Sun Jul 5 16:14:41 2020 |
rana | Update | Computers | rossa re-re-revival | maybe we should make a "dd" copy
of pianosa in case rossa has issues
and someone destroys pianosa by accidentally |
|
|
15450
|
Sun Jul 5 18:25:42 2020 |
rana | Update | Electronics | WFS characterization | in the lab, checkin on the WFS
Sun Jul 5 18:25:50 2020
I redid Gautam's measurements |
|
|
15451
|
Sun Jul 5 18:39:57 2020 |
rana | Update | Computers | rossa: printer | I did
sudo usermod -a -G |
|
|
15454
|
Mon Jul 6 12:43:02 2020 |
rana | Update | Computers | rossa: lib symlink | yes, I rebooted yesterday to fix the 'steaking
white lines' problem in the video/display
maybe we're supposed to edit |
|
|
15473
|
Mon Jul 13 11:33:18 2020 |
rana | Update | Computers | rossa: more developmental work | I too, would prefer py3 for everything,
but aren't all the cdsutils / gaurdian
things still python2? |
|
|
15474
|
Mon Jul 13 11:36:08 2020 |
rana | Update | LSC | MC2 coils need DC balancing? |
if IMC REFL is not increasing,
I don't think its a mis-alignment. Usually,
REFL is a more sensitive indicator of alignment |
|
|
15505
|
Wed Jul 29 11:57:59 2020 |
rana | Update | BHD | In-air BHD - CDS and wiring summary | 3. I agree - this whitening will be handy
to have for diagnostics.
4. I think in principle, we can |
|
|
15509
|
Fri Aug 7 11:23:47 2020 |
rana | Update | BHD | Monte Carlo Simulations | that's great. I think we would like
to figure out how to present this so that
its clear what the distribution of TFs is. |
|
|
15533
|
Tue Aug 18 13:55:23 2020 |
rana | Update | ALS | Whitening and ALS noise | No, there should be no unscheduled visits
from any inspector, marshal, tech, or vendor.
They all have to be escorted or they don't |
|
|
15546
|
Sat Aug 29 18:52:42 2020 |
rana | Update | IOO | IMC gain change | I lowered
the (FAST) PZT gain on the IMC/FSS servo
today. |
|
|
15547
|
Sat Aug 29 20:07:48 2020 |
rana | Update | Electronics | WFS characterization | I set up to do the WFS head modifications
today, but I was shot down in flames due
to a missing AC/DC adapter. |
|
|
15550
|
Sun Aug 30 11:29:33 2020 |
rana | Update | General | power blink? | My power at home winked out for a second
this morning, but it looks like either nothing
happened in the 40m lab or else it rode it |
|
|
15566
|
Wed Sep 9 20:52:45 2020 |
rana | Summary | IOO | wandering line in IMC | since the summary pages are working again,
I was clicking through and noticed that there's
a wandering peak in the whitened IMC spectrogram |
|
|
15574
|
Tue Sep 15 19:17:30 2020 |
rana | Update | IOO | MC F spectrum | that's a very curious disconnection
the "Pentek" whitening
board that carries the MC channels has jumpers |
|
|
15581
|
Sat Sep 19 11:27:04 2020 |
rana | Update | General | M4.5 EQ in LA | the seismometers obviously saturated during
the EQ, but the accelerometers captured some
of it. It looks like there's different |
|
|
15583
|
Sat Sep 19 18:08:34 2020 |
rana | Update | General | M4.5 EQ in LA | the EQ was ~14 km south of Caltech and
17 km deep
|
|
|
15589
|
Sun Sep 20 23:12:13 2020 |
rana | Summary | ALS | ALS noise budget update | I think the digital loop in the ALS budget
is too optimistic. You have to include all
the digital delays and anti-aliasing filters |
|
|
15594
|
Tue Sep 22 12:14:42 2020 |
rana | Summary | ALS | ALS noise budget update | This ALS loop is not stable. Its one of
those traps that comes from using only the
Bode plot to estimate the loop stability. |
|
|
15605
|
Wed Sep 30 19:45:56 2020 |
rana | Update | General | HEPA blower startup capacitor replacement | it would be a good idea for us to have
an auto-reminder to have us check the flow
of all the HEPAs in the lab and elog it once |
|
|
15638
|
Thu Oct 22 13:04:42 2020 |
rana | Update | Electronics | HV coil driver packaged into 2U chassis | what is the noise level before the HV stage?
i.e. how well is the acromag noise being
filtered? |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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) |
|
|
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? |
|
|
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 |
|
|
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. |
|
|
15827
|
Fri Feb 19 18:22:42 2021 |
rana | Update | LSC | PRFPMI sensiing matrix woes | I would:
look at the free swingin
michelson. Should be able tu null that siggnal |
|
|
15831
|
Sun Feb 21 20:51:21 2021 |
rana | Update | General | Housekeeping + PRMI char | I'm curious to see if the demod phase
for MICH in REFL & AS chamges between
thi simple Mcihelson and PRMI. IF there's |
|
|
15854
|
Tue Mar 2 13:39:31 2021 |
rana | Update | LSC | PRM violin filter excessive? | agreed, seems excessive. I always prefer
bandstop over notch in case the eigenfrequency
wanders, but the bandstop could be made to |
|
|
15881
|
Mon Mar 8 19:22:56 2021 |
rana | Summary | SUS | IMC suspension characterization | Herewith,
I describe an adventure |
|
|
15882
|
Mon Mar 8 20:11:51 2021 |
rana | Frogs | Computer Scripts / Programs | activate_matlab out of control on Megatron | there were a zillion processes trying to
activate (this is the initial activation
after the initial installation) matlab 2015b |
|
|
15914
|
Fri Mar 12 13:01:43 2021 |
rana | Summary | SUS | Coil Rs & Ls for PRM/BS/SRM | ugh. sounds bad - maybe a short. I suggest
measuring the inductance; thats usually a
clearer measurement of coil health |
|
|
15921
|
Mon Mar 15 20:40:01 2021 |
rana | Configuration | Computers | installed QTgrace on donatella for dataviewer | I installed QTgrace using yum on donatella. Both Grace and |
|
|
15938
|
Thu Mar 18 12:35:29 2021 |
rana | Update | safety | Door to outside from control room was unlocked | I think this is probably due to the safety
tour yesterday. I beleive Jordan showed them
around the office area and C&B. Not sure |
|
|
15939
|
Thu Mar 18 12:46:53 2021 |
rana | Update | SUS | Testing of new input matrices with new data | Good Enough! Let's move on with output
matrix tuning. I will talk to you guys about
it privately so that the whole doesn't |
|
|
15942
|
Thu Mar 18 21:37:59 2021 |
rana | Update | LSC | PRMI investigations: what IS the matrix?? |
Locked PRMI several tmes after
Gautam setup. Easy w IFO CONFIG screen |
|
|
15950
|
Sun Mar 21 19:31:29 2021 |
rana | Summary | Electronics | RTL-SDR for monitoring RF noise / interference | When we're debugging our RF system,
either due to weird demod phases, or low
SNR, or non-stationary noise in the PDH signals, |
|
|
15952
|
Mon Mar 22 15:10:00 2021 |
rana | Update | SUS | Trying coil actuation balance | There's an integrator in the MC WFS
servos, so you should never be disabling
the ASC inputs in the suspensions. Disabling |
|
|
15975
|
Mon Mar 29 17:34:52 2021 |
rana | Update | SUS | MC2 Coil Balancing updates | I think there's been some mis-communication.
There's no updated Hang procedure, but
there is the one that Anchal, Paco and I |
|
|
16010
|
Fri Apr 9 17:41:12 2021 |
rana | Update | SUS | Faster coil balancing | convergence is great.
Next we wanna get the F2A filters
made since most of the IMC control happens |
|