ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
17377
|
Sat Dec 31 20:00:03 2022 |
rana | Summary | Calibration | ETMY actuation strength cal with 5 lines |
how much frequency dependent variation
in the transfer function do we expect? Are
there resonances in the mechanical suspension |
|
|
17376
|
Sat Dec 31 19:27:32 2022 |
Paco | Summary | Calibration | ETMY actuation strength cal with 5 lines | Calibrated ETMY actuation strength using
ALS. Attachment #1 shows
the result, in close agreement with this |
|
|
17375
|
Fri Dec 30 12:53:47 2022 |
Koji | Update | General | 40m avoided the power outage | Received the campus power outage this (Dec
30, 2022) morning.
- ELOG is still up |
|
|
17374
|
Fri Dec 30 11:38:45 2022 |
Paco | Summary | Calibration | ALS Calibration errors -- single arm actuation | Here are my thoughts on calibration errors.
This applies to the single arm actuation
calibration, but may easily be extended to |
|
|
17373
|
Wed Dec 28 19:50:06 2022 |
Paco | Update | CDS | Another CDS crash -- restored by model restart | Stopped by lab today. Found all suspensions
undamped (even though watchdogs never tripped),
same symptom as CDS crash from earlier this |
|
|
17372
|
Thu Dec 22 15:52:48 2022 |
Koji | Summary | DetChar | Summary on the summary pages | [Tega Koji]
Last week, Tega gave me
a brief introduction to the configuration |
|
|
17371
|
Wed Dec 21 12:38:32 2022 |
Chris | Update | Optimal Control | IMC alignment controller testing | Three additional mode cleaner alignment
controllers were tested Sunday night (remotely).
They were run in tandem with the (recently |
|
|
17370
|
Wed Dec 21 12:35:49 2022 |
Chris | Configuration | CDS | Timing trigger test | While recovering from the power outage,
I took the opportunity to try having the
timing system trigger on the rising edge |
|
|
17369
|
Wed Dec 21 12:18:44 2022 |
Paco | Summary | LSC | FPMI locked, but FPMI BHD not locked | [Yuta, Paco]
We tried restoring the FPMI BHD
readout from yesterday but |
|
|
17368
|
Tue Dec 20 23:32:58 2022 |
rana | Update | ASC | WFS demodulation board modification - further study | That's great - I think this solution
will be best. Having the PLLs actually gives
us some problems - the square wave action |
|
|
17367
|
Tue Dec 20 18:27:14 2022 |
Anchal | Summary | LSC | FPMI locked, DARM calibration data taken, FPMI BHD locked! | [Anchal, Paco, Yuta]
FPMI |
|
|
17366
|
Tue Dec 20 09:20:18 2022 |
Paco | Summary | LSC | FPMI locked and cal | [Anchal, Yuta, Paco]
Late elog (from yesterday) -- We
locked FPMI, YAUX, and turned on calibration |
|
|
17365
|
Sat Dec 17 16:56:19 2022 |
Anchal | Update | ASC | WFS demodulation board modification - further study | I played with the PLL bit more today to
understand the issue. From what I understand,
the following is the summary: |
|
|
17364
|
Fri Dec 16 22:06:55 2022 |
Anchal | Update | SUS | Low noise state | I've turned off HEPA fan and all lights
at:
PST: 2022-12-16 22:06:53.830911 |
|
|
17363
|
Fri Dec 16 21:55:54 2022 |
Anchal | Update | ASC | WFS demodulation board modification attempt 2 - sort of working | [Koji, Anchal]
short version: We checked signals
at different points in the circuit to make |
|
|
17362
|
Fri Dec 16 18:48:49 2022 |
yuta | Summary | General | IFO alignment after power loss | [Paco, Yuta]
We have recovered the IFO alignment |
|
|
17361
|
Fri Dec 16 14:52:42 2022 |
Paco | Summary | SUS | MC1 and MC3 coil dewhitening filters added, location corrected | I corrected the filter module location
for 28 Hz ELP filter on MC1 and MC3 coil
output filter banks to FM8 (from FM9). FM9 |
|
|
17360
|
Thu Dec 15 08:37:52 2022 |
JC | Update | Daily Progress | IMC Misalignment | PMC seems to have gotten very misaligned
over the last 12 hours. I'm going in
to align now. |
|
|
17359
|
Wed Dec 14 17:01:39 2022 |
Paco | Summary | LSC | FPMI in the post-cds upgrade era | [Paco, Anchal, Koji]
A possible long-hidden
bug of MC2 dewhitening switching was found |
|
|
17358
|
Wed Dec 14 12:37:20 2022 |
Radhika | Update | ALS | XARM green laser lock debugging | On Monday I aimed to measure the transfer function
of the x-arm AUX PDH loop while momentarily |
|
|
17357
|
Tue Dec 13 23:49:17 2022 |
Anchal | Update | SUS | Low noise state | I've turned off HEPA fan and all lights
at:
PST: 2022-12-13 23:49:12.955214 |
|
|
17356
|
Fri Dec 9 23:44:14 2022 |
rana | Summary | ASC | MC WFS sensing matrix measurement | with the new output matrix, we repeated
the diagonalization script that Anchal ran
previously. In the attached plot you can |
|
|
17355
|
Fri Dec 9 21:54:40 2022 |
Radhika | Update | ASC | Moku digital filter for low-frequency resonances (ALS/calibration) | [Radhika, Paco]
I modeled a digital filter for
adding a resonance at a desired frequency |
|
|
17354
|
Fri Dec 9 18:32:11 2022 |
Koji | Summary | ASC | MC WFS sensing matrix measurement | [Rana, Koji]
The IMC WFS pitch Output
Matrix was recalculated based on a DC Sensing |
|
|
17353
|
Fri Dec 9 17:42:04 2022 |
Koji | Update | CDS | New donatella issues |
MEDM video switches didn't
work - "sh: 1: /opt/rtcds/caltech/c1/scripts/general/videoscripts/videoswitch3:
not found"
This was |
|
|
17352
|
Fri Dec 9 14:18:43 2022 |
Anchal | Summary | SUS | IMC optics angular actuation calibration at DC | Also reply to: 40m/16125
I migrated the code used
in 40m/16125 |
|
|
17351
|
Fri Dec 9 13:18:57 2022 |
yuta | Summary | BHD | MICH BHD optical gain measurements at different LO phases, elliptic fit | [Yehonathan, Yuta]
Here's a plot using same dataset |
|
|
17350
|
Fri Dec 9 10:08:54 2022 |
Radhika | Update | ASC | YEND green alignment chronicles | Today I set out to align and lock the
YEND green laser, and observe the expected
PDH error signal and PZT control signal. |
|
|
17349
|
Fri Dec 9 05:04:45 2022 |
rana | Summary | ASC | MC WFS sensing matrix measurement | I made a script to toggle the offsets in
the MC SUS so that we can see the resulting
error signals in the MC WFS / MC-TRANS_QPD. |
|
|
17348
|
Thu Dec 8 20:40:14 2022 |
Anchal | Update | ASC | WFS demodulation board modification attempt | Based on the previous two elog posts, Koji
and I decided that we should use 11 MHz signal
for arm cavity ASC and modify a spare WFS |
|
|
17347
|
Thu Dec 8 17:52:39 2022 |
yuta | Summary | BHD | MICH BHD optical gain measurements at different LO phases, RF+audio dither | [Yehonathan, Yuta]
Sensing matrix measurements at
different LO phases were performed under |
|
|
17346
|
Thu Dec 8 16:21:40 2022 |
Paco | Summary | Calibration | ITMY actuation strength cal with 5 lines | [Anchal, Paco]
After debugging the hardware, on
gpstime 1354422834 we turned |
|
|
17345
|
Wed Dec 7 16:21:05 2022 |
yuta | Summary | BHD | Improved MICH BHD alignment | [Yehonathan, Yuta]
We found that moving AS1 in yaw improves |
|
|
17344
|
Tue Dec 6 17:40:13 2022 |
Koji | Update | ASC | IMC WFS heads electronic feasibility test for using for Arm ASC | We have spare WFS demods in a plastic box
along the Y arm. So you don't need to
modify the IMC demod boards, which we want |
|
|
17343
|
Tue Dec 6 17:12:23 2022 |
yehonathan | Summary | BHD | LO phase control using audio (MICH and AS1) + RF | {Yuta, Yehonathan}
Today we lock LO phase using audio+RF
method in two variants: AS1+RF and MICH(BS)+RF. |
|
|
17342
|
Tue Dec 6 16:52:26 2022 |
Anchal | Update | ASC | IMC WFS heads electronic feasibility test for using for Arm ASC | I tested teh WFS demod board for possibility
of demodulating 11 MHz or 55 MHz signal with
it. It definitely has some bandpass filter |
|
|
17341
|
Tue Dec 6 15:59:46 2022 |
Radhika | Update | ALS | XARM green laser lock debugging | [Radhika, Paco]
Paco suggested that alignment could
still be the primary reason why the XEND |
|
|
17340
|
Tue Dec 6 15:29:35 2022 |
Radhika | Update | ALS | XARM green laser lock debugging | [Radhika, JC]
We retook transfer function measurements
of the XEND PDH servo box, this time setting |
|
|
17339
|
Tue Dec 6 13:09:44 2022 |
yuta | Update | BHD | c1cal model updates to support sensing matrix for BHD | [Anchal, Yuta]
We have modified c1cal model to support |
|
|
17338
|
Tue Dec 6 09:39:22 2022 |
yehonathan | Update | CDS | Another CDS crash | Around 9:30 we noticed IMC going out of
lock with MC1 swinging hard. It seems like
the coil output shut down. |
|
|
17337
|
Mon Dec 5 20:02:06 2022 |
Anchal | Update | ASC | IMC WFS heads electronic feasibility test for using for Arm ASC | I took transfer function measurement of
WFS2 SEG4 photodiode between 1 MHz to 100
MHz in a linear sweep. |
|
|
17336
|
Mon Dec 5 16:24:45 2022 |
Anchal | Update | ASC | IMC WFS servo diagnosis | Also reply to: 40m/17255
I ran the toggleWFSoffsets.py
script to generate a step response of the |
|
|
17335
|
Mon Dec 5 12:05:29 2022 |
Anchal | Update | CDS | c1sus2 all FE models crashed spontaneously | Just a few minutes ago, all models on FE
c1sus2 crashed. I'm attaching some important
files that can be helpful in investigating |
|
|
17334
|
Sun Dec 4 16:44:04 2022 |
Anchal | Update | ASC | IMC WFS Fixed for now | Today, I worked on WFS loop output matrix
for PIT DOFs.
I began with the matrix |
|
|
17333
|
Sun Dec 4 10:03:02 2022 |
Chris | Update | Optimal Control | IMC alignment controller testing | Another five
mode cleaner alignment controllers were tested
last night (remotely), running in tandem |
|
|
17332
|
Sat Dec 3 17:42:25 2022 |
Anchal | Update | ASC | IMC WFS Fixed for now | Today I did a lot of steps to eventually
reach to WFS locking stably for long times
and improving and keeping the IMC transmission |
|
|
17331
|
Sat Dec 3 10:13:56 2022 |
Anchal | Update | SUS | Low noise state | I've turned off HEPA fan and all lights
at:
PST: 2022-12-03 10:13:03.184705 |
|
|
17330
|
Fri Dec 2 15:59:55 2022 |
Radhika | Update | ALS | XARM green laser lock debugging | I took a transfer function measurement
of the XEND PDH servo box, from servo input
to piezo output [Attachment 1]. The servo |
|
|
17329
|
Thu Dec 1 20:43:25 2022 |
Anchal | Summary | Calibration | Single arm cal with 5 lines | [Anchal, Paco]
We are doing this attempt again
in following configuration: |
|
|
17328
|
Wed Nov 30 20:01:08 2022 |
rana | Summary | Calibration | Single arm cal with 5 lines | I don't think you need to record the
excitations. They are just sine waves. The
amplitude you can read off from the OSC screen. |
|