| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
16197
|
Thu Jun 10 14:01:36 2021 |
Anchal | Summary | AUX | Xend Green Laser PDH OLTF measurement loop algebra | Attachment 1 shows the closed loop of Xend
Green laser Arm PDH lock loop. Free running
laser noise gets injected at laser head after |
|
|
16198
|
Fri Jun 11 20:19:50 2021 |
Koji | Summary | BHD | BHD OMC invacuum wiring | Stephen and I discussed the in-vacuum OMC
wiring.
- One of the OMCs has already been |
|
|
16202
|
Tue Jun 15 15:26:43 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF measurement loop algebra, excitation at control point | Attachment 1 shows the case when excitation
is sent at control point i.e. the PZT output.
As before, free running laser noise |
|
|
16204
|
Wed Jun 16 13:20:19 2021 |
Anchal, Paco | Summary | Cameras | Mon 7 in Control Room Replaced | We replaced the Mon 7 with an LCD monitor
from back bench. It is fed the analog signal
from BNC converted into VGS with a converter |
|
|
16213
|
Fri Jun 18 10:07:23 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF with coherence | We did the measurement of OLTF for Xend
green laser PDH loop with excitation added
at control point using a SR560 as shown in |
|
|
16214
|
Fri Jun 18 14:53:37 2021 |
Anchal | Summary | PEM | Temperature sensor network proposal | I propose we set up a temperature sensor
network as described in attachment 1.
Here there are two types of units: |
|
|
16228
|
Tue Jun 29 17:42:06 2021 |
Anchal, Paco, Gautam | Summary | LSC | MICH locking tutorial with Gautam | Today we went through LSC locking mechanics
with Gautam and as a "Hello World"
example, worked on locking michelson cavity. |
|
|
16231
|
Wed Jun 30 15:31:35 2021 |
Anchal | Summary | Optical Levers | Centered optical levers on ITMY, BS, PRM and ETMY | When both arms were locked, we found that
ITMY optical lever was very off-center. This
seems to have happened after the c1susaux |
|
|
16232
|
Wed Jun 30 18:44:11 2021 |
Anchal | Summary | LSC | Tried fixing ETMY QPD | I worked in Yend station, trying to get
the ETMY QPD to work properly. When I started,
only one (quadrant #3) of the 4 quadrants |
|
|
16233
|
Thu Jul 1 10:34:51 2021 |
Paco, Anchal | Summary | LSC | ETMY QPD fixed | Paco worked on alignign the beam splitter
to get light on the ETMY QPD and was successful
in centering it without any other changes |
|
|
16236
|
Thu Jul 1 16:55:21 2021 |
Anchal | Summary | Optical Levers | Fixed Centeringoptical levers PRM | This was a mistake. When arms are locked,
PRM is misaligned by setting -800 offset
in PIT dof of PRM. The oplev is set to function |
|
|
16237
|
Fri Jul 2 12:42:56 2021 |
Anchal, Paco, Gautam | Summary | LSC | snap file changed for MICH | We corrected the MICH locking snap file
C1configure_MI.req and saved an updated C1configure_MI.snap.
Now the 'Restore MICH' script in |
|
|
16240
|
Tue Jul 6 17:40:32 2021 |
Koji | Summary | General | Lab cleaning | We held the lab cleaning for the
first time since the campus reopening (Attachment
1). |
7x |
|
16241
|
Thu Jul 8 11:20:38 2021 |
Anchal, Paco, Gautam | Summary | LSC | PRFPMI locking attempts | Last night Gautam walked us through the
algorithm used to lock PRFPMI. We tried it
several times with the PSL HEPA filter off |
|
|
16242
|
Fri Jul 9 15:39:08 2021 |
Anchal | Summary | ALS | Single Arm Actuation Calibration with IR ALS Beat [Correction] | I did this analysis again by just doing
demodulation go 5s time segments of the 60s
excitation signal. The major difference is |
|
|
16287
|
Mon Aug 23 10:17:21 2021 |
Paco | Summary | Computers | system reboot glitch | [paco]
At 09:34 PST I noted a glitch in
the controls room as the machines went down |
|
|
16303
|
Mon Aug 30 17:49:43 2021 |
Paco | Summary | LSC | XARM POX OLTF | Used diaggui to get OLTF in preparation
for optimal system identification / calibration.
The excitation was injected at the control |
|
|
16304
|
Tue Aug 31 14:55:24 2021 |
rana | Summary | LSC | XARM POX OLTF | this model doesn't seem to include
the analog AA, analog AI, digital AA, digital
AI, or data transfer delays in the system. |
|
|
16306
|
Wed Sep 1 21:55:14 2021 |
Koji | Summary | General | Towards the end upgrade | - Sat amp
mod and test: on going (Tega)
- Coil driver mod and test: on going |
|
|
16307
|
Thu Sep 2 17:53:15 2021 |
Paco | Summary | Computers | chiara down, vac interlock tripped | [paco, koji, tega, ian]
Today in the morning the name server
/ network file system running in chiara failed. |
|
|
16312
|
Thu Sep 2 21:21:14 2021 |
Koji | Summary | Computers | Vacuum recovery 2 | Attachment 1:
We are pumping the main volume with
TP2. Once P1a reached the pressure ~2.2mtorr, |
|
|
16313
|
Thu Sep 2 21:49:03 2021 |
Paco | Summary | Computers | chiara down, vac interlock tripped | [tega, paco]
We found the files that took excess
space in the chiara filesystem (see Attachment |
|
|
16314
|
Fri Sep 3 02:03:15 2021 |
Tega | Summary | Computers | Strip down large error files | Also deleted the ~50GB error files from
ldas to prevent rsync from copying them
to nodus again. With the new update to GWsumm, |
|
|
16315
|
Tue Sep 7 18:00:54 2021 |
Tega | Summary | Calibration | System Identification via line injection | [paco]
This morning, I spent some time
restoring the jupyter notebook server running |
|
|
16318
|
Thu Sep 9 09:54:41 2021 |
Stephen | Summary | BHD | BHD OMC invacuum wiring - cable lengths | [Koji, Stephen - updated 30 September]
Cable lengths task - in vacuum
cabling for the green section (new, custom |
|
|
16323
|
Mon Sep 13 17:05:04 2021 |
Tega | Summary | PEM | Infrasensing temperature sensor modbus configuration | Anchal mentioned it would be good to put
more details about how I arrived at the values
needed to configure the modbus drive for |
|
|
16329
|
Tue Sep 14 17:19:38 2021 |
Paco | Summary | PEM | Excess seismic noise in 0.1 - 0.3 Hz band | For the past couple of days the 0.1 to
0.3 Hz RMS seismic noise along BS-X has increased.
Attachment 1 shows the hour trend in the |
|
|
16331
|
Tue Sep 14 19:12:03 2021 |
Koji | Summary | PEM | Excess seismic noise in 0.1 - 0.3 Hz band | Looks like this increase is correlated
for BS/EX/EY. So it is likely to be real.
Comparison between 9/15 |
|
|
16334
|
Wed Sep 15 23:53:54 2021 |
Koji | Summary | General | Towards the end upgrade | Ordered compoenents are in.
- Made 36 more Sat Amp internal
boards (Attachment 1). Now |
|
|
16343
|
Mon Sep 20 12:20:31 2021 |
Paco | Summary | SUS | PRM and BS Angular Actuation transfer function magnitude measurements | [yehonathan, paco, anchal]
We attempted to find any symptoms
for actuation problems in the PRMI configuration |
|
|
16345
|
Mon Sep 20 14:22:00 2021 |
rana | Summary | SUS | PRM and BS Angular Actuation transfer function magnitude measurements | I suggest plotting all the traces in the
plot so we can see their differences. Also
remove the 1/f^2 slope so that we can see |
|
|
16348
|
Mon Sep 20 15:42:44 2021 |
Ian MacMillan | Summary | Computers | Quantization Code Summary | This post serves as a summary and description
of code
to run to test the impacts of quantization |
|
|
16351
|
Tue Sep 21 11:09:34 2021 |
Anchal | Summary | CDS | XARM YARM UGF Servo and Oscillators added | I've updated the c1LSC simulink model
to add the so-called UGF servos in the XARM
and YARM single arm loops as well. These |
|
|
16352
|
Tue Sep 21 11:13:01 2021 |
Paco | Summary | Calibration | XARM calibration noise | Here are some plots from analyzing the
C1:LSC-XARM calibration. The experiment is
done with the XARM (POX) locked, a single |
|
|
16353
|
Wed Sep 22 11:43:04 2021 |
rana | Summary | Calibration | XARM calibration noise | I would expect to see some lower frequency
effects. i.e. we should look at the timeseries
of the demod with the excitation on and off. |
|
|
16354
|
Wed Sep 22 12:40:04 2021 |
Anchal | Summary | CDS | XARM YARM UGF Servo and Oscillators shifted to OAF | To reduce burden on c1lsc, I've shifted
the added UGF block to to c1oaf model. c1lsc
had to be modified to allow addition of an |
|
|
16355
|
Wed Sep 22 14:22:35 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | Now that we have a model of how the SS
and IIR filters work we can get to the problem
of how to measure the quantization noise |
|
|
16358
|
Thu Sep 23 15:29:11 2021 |
Paco | Summary | SUS | PRM and BS Angular Actuation transfer function magnitude measurements | [Anchal, Paco]
We had a second go at this with
an increased number of averages (from 10 |
|
|
16360
|
Mon Sep 27 12:12:15 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I have not been able to figure out a way
to make the system that Aaron and I talked
about. I'm not even sure it is possible |
|
|
16361
|
Mon Sep 27 16:03:15 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | I have coded up the procedure in the previous
post: The result does not look like what
I would expect. |
|
|
16362
|
Mon Sep 27 17:04:43 2021 |
rana | Summary | Computers | Quantization Noise Calculation Summary | I suggest that you
change the corner frequency
to 10 Hz as I suggested last week. This filter, |
|
|
16363
|
Tue Sep 28 16:31:52 2021 |
Paco | Summary | Calibration | XARM OLTF (calibration) at 55.511 Hz | [anchal, paco]
Here is a demonstration of the
methods leading to the single (X)arm calibration |
|
|
16365
|
Wed Sep 29 17:10:09 2021 |
Anchal | Summary | CDS | c1teststand problems summary | [anchal, ian]
We went and collected some information
for the overlords to fix the c1teststand |
|
|
16366
|
Thu Sep 30 11:46:33 2021 |
Ian MacMillan | Summary | Computers | Quantization Noise Calculation Summary | First and foremost I have the updated bode
plot with the mode moved to 10 Hz. See Attachment
1. Note that the comparison measurement is |
|
|
16367
|
Thu Sep 30 14:09:37 2021 |
Anchal | Summary | CDS | New way to ssh into c1teststand | Late elog, original time
Wed Sep 29 14:09:59 2021
We opened a new port (22220) in |
|
|
16369
|
Thu Sep 30 18:04:31 2021 |
Paco | Summary | Calibration | XARM OLTF (calibration) with three lines | [anchal, paco]
We repeated the same procedure
as before, but with 3 different lines at |
|
|
16371
|
Fri Oct 1 14:25:27 2021 |
yehonathan | Summary | SUS | PRM and BS Angular Actuation transfer function magnitude measurements | {Paco, Yehonathan, Hang}
We measured the sensing PRMI sensing
matrix. Attachment 1 shows the results, the |
|
|
16372
|
Mon Oct 4 11:05:44 2021 |
Anchal | Summary | CDS | c1teststand problems summary | [Anchal, Paco]
We tried to fix the ntp synchronization
in c1teststand today by repeating the steps |
|
|
16374
|
Mon Oct 4 16:00:57 2021 |
Yehonathan | Summary | SUS | PRM and BS Angular Actuation transfer function magnitude measurements | {Yehonathan, Anchel}
In an attempt to fix the actuation
of the PRMI DOFs we set to modify the output |
|
|
16375
|
Mon Oct 4 16:10:09 2021 |
rana | Summary | SUS | PRM and BS Angular Actuation transfer function magnitude measurements | not sure that this is necessary.
If you look at teh previous entries Gautam
made on this topic, it is clear that the |
|