| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15985
|
Thu Apr 1 18:01:06 2021 |
Anchal, Paco | Update | SUS | MC2 Coil Balancing Test Results Success?? | After fixing a few things we felt were
wrong in our implementation of the algorithm,
we ran the coil balancing for 12 iterations |
|
|
15995
|
Mon Apr 5 08:25:59 2021 |
Anchal, Paco | Update | General | Restore MC from early quakes | [Paco, Anchal]
Came in a little bit after 8 and
found the MC unlocked and struggling to lock |
|
|
16001
|
Tue Apr 6 18:46:36 2021 |
Anchal, Paco | Update | SUS | Updates on recent efforts | As mentioned in last post, we earlier made
an error in making sure that all time series
arrays go in with same sampling rate in CSD |
|
|
16007
|
Thu Apr 8 17:04:43 2021 |
Anchal, Paco | Update | SUS | First Successful Coil Balancing | Today, we finally crossed the last hurdle
and got a successful converging coil balancing
run. |
|
|
16009
|
Fri Apr 9 13:13:00 2021 |
Anchal, Paco | Update | SUS | Faster coil balancing | We ran again this method but with the 'b'
parameter as a matrix instead. This provides
more gain on some off-diagonal terms than |
|
|
16016
|
Mon Apr 12 08:32:54 2021 |
Anchal, Paco | Summary | PSL | PMC unlocked at 2pm on Sunday; ~ Restored | PMC lost lock between 21:00 and 22:00 UTC
on April 11th as seen in the summary pages:
https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20210411/psl/#gallery-4 |
|
|
16042
|
Fri Apr 16 11:36:36 2021 |
Anchal, Paco | Update | SUS | Tested proposed filters for POS colum in MC2 output matrix | We tried two sets of filters on the output
matrix POS column in MC2. Both versions failed.
Following are some details. |
|
|
16049
|
Mon Apr 19 12:18:19 2021 |
Anchal, Paco | Update | SUS | Tested proposed filters for POS colum in MC2 output matrix | The filters were somewhat successful, how
much we can see in attachment 1. The tip
about difference between eigenmode basis |
|
|
16054
|
Tue Apr 20 10:52:49 2021 |
Anchal, Paco | Update | SUS | AC gain coil output balancing for IMC | [Paco, Anchal]
We adopted the following
procedure to balance the coil output gains |
|
|
16063
|
Wed Apr 21 11:38:27 2021 |
Anchal, Paco | Update | SUS | MC2 Damping Gains Optimized | We did a step response test with MC2 Suspensoin
Damping Gains and optimized them to get <5
oscillations in ringdown. |
|
|
16066
|
Wed Apr 21 15:50:01 2021 |
Anchal, Paco | Update | SUS | MC2 Suspension Optimization summary |
MC2
Coil Balancing DC and AC Gains
|
|
|
16072
|
Thu Apr 22 12:17:23 2021 |
Anchal, Paco | Update | SUS | MC1 and MC3 Suspension Optimization Summary | |
|
|
16085
|
Mon Apr 26 18:52:52 2021 |
Anchal, Paco | HowTo | Computer Scripts / Programs | awg free slot | Today we had some trouble launching an
excitation on C1:IOO-MC_LSC_EXC from awggui.
The error read: |
|
|
16086
|
Mon Apr 26 18:55:39 2021 |
Anchal, Paco | Update | SUS | MC2 F2A Filters Tested | Today we tested the F2A filters created
from the DC gain values listed in 16066.
Filters:
For |
|
|
16087
|
Tue Apr 27 10:05:28 2021 |
Anchal, Paco | Update | SUS | MC1 and MC3 F2A Filters Tested | We extended the f2a filter implementation
and diagnostics as summarized in 16086
to MC1 and MC3. |
|
|
16089
|
Wed Apr 28 10:56:10 2021 |
Anchal, Paco | Update | SUS | IMC Filters diagnosed | Good
morning! |
7x |
|
16108
|
Mon May 3 09:14:01 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise | Lock
ARMs |
|
|
16117
|
Tue May 4 11:43:09 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise | We redid the WFS noise injection test and
have compiled some results on noise contribution
in arm cavity noise and IMC frequency noise |
|
|
16127
|
Fri May 7 11:54:02 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise | We today measured the calibration factors
for XARM_OUT and YARM_OUT in nm/cts and replotted
our results from 16117 |
|
|
16128
|
Mon May 10 10:57:54 2021 |
Anchal, Paco | Summary | Calibration | Using ALS beatnote for calibration, test | Test details:
We
locked both arms and opened the shutter for
Yend green laser.
After toggling |
|
|
16129
|
Mon May 10 18:19:12 2021 |
Anchal, Paco | Update | LSC | IMC WFS noise contribution in arm cavity length noise, Corrections | A few corrections to last analysis:
The first plot was not
IMC frequency noise but actually MC_F noise |
|
|
16132
|
Wed May 12 10:53:20 2021 |
Anchal, Paco | Update | LSC | PSL-IMC PDH Loop and XARM PDH Loop diagram | Attached is the control loop diagram when
main laser is locked to IMC and a single
arm (XARM) is locked to the transmitted light |
|
|
16133
|
Wed May 12 11:45:13 2021 |
Anchal, Paco | Summary | SUS | New IMC Settings are miserable | We picked a few parameters from 40m summary
page and plotted them to see the effect of
new settings. On April 4th, old settings |
|
|
16138
|
Thu May 13 11:55:04 2021 |
Anchal, Paco | Update | SUS | MC1 suspension misbehaving | We came in the morning with the following
scene on the zita monitor:
|
|
|
16157
|
Mon May 24 19:14:15 2021 |
Anchal, Paco | Summary | SUS | MC1 Free Swing Test set to trigger | We've set a free swing test to trigger
at 3:30 am tomorrow for MC1. The script for
tests is running on tmux session named 'freeSwingMC1' |
|
|
16159
|
Tue May 25 10:22:16 2021 |
Anchal, Paco | Summary | SUS | MC1 new input matrix calculated and uploaded | The test was succesful and brought back
the IMC to lock point at the end.
We calculated new input matrix |
|
|
16161
|
Tue May 25 17:42:11 2021 |
Anchal, Paco | Summary | ALS | ALS Single Arm Noise Budget | Here is our first attempt at a single-arm
noise budget for ALS.
Attachment 1 shows |
|
|
16163
|
Wed May 26 11:45:57 2021 |
Anchal, Paco | Configuration | IMC | MC2 analog camera | [Anchal, Paco]
We went near the MC2 area and opened
the lid to inspect the GigE and analog video |
|
|
16164
|
Thu May 27 11:03:15 2021 |
Anchal, Paco | Summary | ALS | ALS Single Arm Noise Budget | Here's an updated X ARM ALS noise budget.
Things to remember:
Major
mistake we were making earlier was that we |
|
|
16171
|
Tue Jun 1 16:55:32 2021 |
Anchal, Paco | Summary | ALS | Single Arm Actuation Calibration with IR ALS Beat | Rana suggested in today's meeting to
put in a notch filter in the XARM IR PDH
loop to avoid suppressing the excitation |
|
|
16174
|
Wed Jun 2 09:43:30 2021 |
Anchal, Paco | Summary | SUS | IMC Settings characterization | Plot description:
We
picked up three 10 min times belonging to
the three different configurations:
'Old |
|
|
16175
|
Wed Jun 2 16:20:59 2021 |
Anchal, Paco | Summary | SUS | IMC Suspension gains reverted to old values | Following the conclusion, we are reverting
the suspension gains to old values, i.e.
|
|
|
16192
|
Tue Jun 8 11:40:53 2021 |
Anchal, Paco | Summary | ALS | Single Arm Actuation Calibration with IR ALS Beat | We attempted to simulate "oscillator
based realtime calibration noise monitoring"
in offline analysis with python. This helped |
|
|
16194
|
Wed Jun 9 11:46:01 2021 |
Anchal, Paco | Summary | AUX | Xend Green Laser PDH OLTF measurement | We measured the Xend green laser PDH Open
loop transfer function by following method:
We first measured the feedback |
|
|
16196
|
Wed Jun 9 18:29:13 2021 |
Anchal, Paco | Summary | ALS | Check for saturation in ITMX SOS Driver | We did a quick check to make sure there
is no saturation in the C1:SUS-ITMX_LSC_EXC
analog path. For this, we looked at the SOS |
|
|
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 |
|
|
16209
|
Thu Jun 17 11:45:42 2021 |
Anchal, Paco | Update | SUS | MC1 Gave trouble again | TL;DR
MC1 LL Sensor showed signs of fluctuating
large offsets. We tried to find the issue |
|
|
16210
|
Thu Jun 17 16:37:23 2021 |
Anchal, Paco | Update | SUS | c1susaux computer rebooted | Jon suggested to reboot the acromag chassis,
then the computer, and we did this without
success. Then, Koji suggested we try running |
|
|
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 |
|
|
16218
|
Tue Jun 22 11:56:16 2021 |
Anchal, Paco | Update | SUS | ADC/Slow channels issues | We checked back in time to see how the
BS and PRM OSEM slow channels are zero. It
was clear that they became zero when we worked |
|
|
16445
|
Tue Nov 2 18:54:41 2021 |
Anchal, Paco | Update | BHD | Optical fibres laid for BHD upgrade | We successfully laid down all required
optical fibre fiber cables from 1X4-1X7
region to 1Y1-1Y3 region today. This includes |
|
|
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. |
|
|
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 |
|
|
16239
|
Tue Jul 6 16:35:04 2021 |
Anchal, Paco, Gautam | Update | IOO | Restored MC | We found that megatron is unable to properly
run scripts/MC/WFS/mcwfsoff and scripts/MC/WFS/mcwfson
scripts. It fails cdsutils commands due to |
|
|
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 |
|
|
16112
|
Mon May 3 17:28:58 2021 |
Anchal, Paco, Rana | Update | LSC | IMC WFS noise contribution in arm cavity length noise | Rana came and helped us figure us where
to inject the noise. Following are the characteristics
of the test we did: |
|
|
16190
|
Mon Jun 7 15:37:01 2021 |
Anchal, Paco, Yehonathan | Summary | Cameras | Mon 7 in Control Room Died | We found Mon7 in control room dead today
afternoon. It's front power on green
light is not lighting up. All other monitors |
|
|
10130
|
Sat Jul 5 04:18:45 2014 |
Andres | Update | 40m Xend Table upgrade | Adding Two Lenses After the Second Steering Mirror in Order Two Increase the Gouy Phase Difference Between the Sterring Mirrors | I had been working on the Xend table optical
layout update. Since the two steering mirrors
in the Xend green are too close to each, |
7x |
|
10191
|
Sun Jul 13 17:06:35 2014 |
Andres | Update | 40m Xend Table upgrade | Xarm Table Upgrade Calculation and Diagrams of possible new table layout | Current Mode Matching
and Gouy Phase Between Steering Mirrors |
|