| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
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 |
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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: |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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: |
|
|
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 |
|
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 |
|
|
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 |
|
|
15876
|
Sun Mar 7 19:56:27 2021 |
Anchal | Update | LSC | Sensing matrix settings messed with | I understand this mst be frustrating for
you. But we did not change these settings,
knowingly atleast. We have documented all |
|
|
15896
|
Wed Mar 10 15:29:58 2021 |
Anchal | Summary | IMC | IMC free swinging prep | No we didn't fix the issue. We'll
post some screenshots tomorrow. From "sitemap>Shutter>PSL"
we meant in Shutter medm window, we clicked |
|
|
15916
|
Fri Mar 12 18:10:01 2021 |
Anchal | Summary | Computer Scripts / Programs | Installed cds-workstation on allegra | allegra had fresh Debian 10 installed on
it already. I installed cds-workstation packages
(with the help of Erik von Reis). I checked |
|
|
15934
|
Wed Mar 17 16:30:46 2021 |
Anchal | Update | SUS | Normalized Input Matrices plotted better than SURF students | Here, I present the same input matrices
now normalized row by row to have same norm
as current matrices rows. These now I plotted |
|
|
15971
|
Sun Mar 28 14:16:25 2021 |
Anchal | Summary | SUS | MC3 new Input Matrix not providing stable loop | Rana asked us to write out here the new
MC3 input matrix we have calculated along
with the old one. The new matrix is not working |
|
|
15988
|
Thu Apr 1 21:13:54 2021 |
Anchal | Update | SUS | Matrix results, new measurement set to trigger |
New
Input matrix used for MC2 (C1:SUS-MC2_INMATRIX_ii_jj
|
|
|
15991
|
Fri Apr 2 14:51:20 2021 |
Anchal | Update | SUS | Bug found, need to redo the balancing | Last run gave similar results as the quick
run we did earlier. The code has been unable
to strike out couplings with POS. We found |
|
|
16005
|
Wed Apr 7 17:38:51 2021 |
Anchal | Update | SUS | Trying to uncouple only PIT and YAW first | To test if our method is working at all,
we went for the simpler case of just uncoupling
PIT and YAW. This is also because the sensor |
|