| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
17411
|
Mon Jan 23 16:31:23 2023 |
rana | Update | ALS | DFD and Phase tracker AM coupling | Both the TF measurement and the noise measurements
are useful, but the nosie measurement is
much more meaningful. Since we expect the |
|
|
17410
|
Mon Jan 23 11:20:44 2023 |
JC | Summary | BHD | BH44 RFPD optical path and LO/AS camera | Here's the beam path of BH44. |
|
|
17409
|
Sat Jan 21 18:01:06 2023 |
Anchal | Update | ALS | DFD and Phase tracker AM coupling | I took transfer function measurement
of DFD AM coupling using noise excitation.
Noise excitation |
|
|
17408
|
Sat Jan 21 15:32:40 2023 |
Anchal | Update | ASC | AS WFS path nominally set | I've completed the beam redirection
path for AS beam to WFS heads in a nominal
way. By that I mean that all mirrors (M1, |
|
|
17407
|
Fri Jan 20 20:13:20 2023 |
Anchal | Update | ASC | Installed 2 flipper mirrors for handingl MC reflection beam to camera | After discussions with Yuta, I figured
that a better optical layout is possible
which does not interfere with the existing |
|
|
17406
|
Thu Jan 19 20:35:54 2023 |
Anchal | Update | ASC | Installed 2 flipper mirrors for handingl MC reflection beam to camera | Today I installed two flipper mirrors M3
and M4 (see attached photo) to create alternate
route for MC reflection camera beam. Both |
|
|
17405
|
Thu Jan 19 18:15:48 2023 |
yuta | Summary | BHD | BH44 RFPD optical path and LO/AS camera | [JC, Paco, Anchal, Yuta]
- We installed the new BH44 beam path |
|
|
17404
|
Thu Jan 19 14:58:40 2023 |
rana | Summary | BHD | IQ demod orthogonal | the
problems with these circle plots: |
|
|
17403
|
Thu Jan 19 12:12:09 2023 |
Anchal | Summary | BHD | IQ demod orthogonal | By sending two frequencies offset from
eachother to LO input and RF input, we measured
the remaining phase difference between I |
|
|
17402
|
Wed Jan 18 20:57:53 2023 |
Paco | Summary | BHD | IQ demod orthogonal | I tested a spare IQ demod board labeled
33.3 MHz (closer to 44 MHz than the 165 MHz
we had started using) and using the Moku |
|
|
17401
|
Tue Jan 17 20:03:19 2023 |
yuta | Summary | BHD | BH44 installations: IQ demodulator is not orthogonal | [Anchal, Paco, JC, Yuta]
We have started hardware installations |
6x |
|
17400
|
Fri Jan 13 18:54:59 2023 |
yuta | Summary | LSC | Investigations of LO phase locking in FPMI BHD | [Paco, Yuta]
After several hours of unattended |
|
|
17399
|
Fri Jan 13 14:20:34 2023 |
yuta | Summary | LSC | Calibration friendly FPMI BHD | [Paco, Yuta]
Gains in DARM are corrected to make |
|
|
17398
|
Fri Jan 13 13:34:12 2023 |
Anchal | Summary | BHD | BH44 tuned and transimpedance measured | I've tuned one gold box RFPD to be
resonant at 44.26 MHz and I left the notch
to be near 66 MHz, however, it is only effective |
|
|
17397
|
Thu Jan 12 18:51:17 2023 |
Paco | Update | ALS | DFD and Phase tracker AM coupling | [Anchal, Paco]
We measured DFD AM coupling; it
seems to be minimum at higher RF input and |
|
|
17396
|
Thu Jan 12 15:31:27 2023 |
Radhika | Update | ALS | XARM green laser lock debugging | [Radhika, Anchal, Paco]
AUX
PDH Loop Stability |
|
|
17395
|
Thu Jan 12 12:00:09 2023 |
Paco | Summary | LSC | FPMI BHD sensitivity curve with higher resolution upto 6.9 kHz | Here's the same sensitivity plot from
yesterday (40m/17392),
but with higher frequency resolution, upto |
|
|
17394
|
Thu Jan 12 10:06:10 2023 |
Paco | Update | ALS | DFD discriminant calibration | [Paco, Anchal] Log from yesterday
work around 1Y2 rack; note that while this
work was ongoing, TT2 position drifted slowly |
|
|
17393
|
Wed Jan 11 17:05:55 2023 |
Anchal | Update | ASC | WFS demodulation board 112B - Working as expected | The other modified board 112B has been
fixed and tested now. See the results attached.
The issue was in some malfunctioning OP284 |
|
|
17392
|
Wed Jan 11 16:56:57 2023 |
yuta | Summary | LSC | FPMI BHD recovered, LO phase noise not limiting the sensitivity | [Paco, Yuta]
We recovered FPMI BHD, and sensitivity |
6x |
|
17391
|
Tue Jan 10 20:24:29 2023 |
Anchal | Update | ASC | WFS demodulation board 111B - Working as expected | I've completed the modifications on
two WFS demod boards. This required replacing
all 8 mixer ICs on each board. I also tuned |
|
|
17390
|
Tue Jan 10 16:06:58 2023 |
yuta | Summary | PSL | PMC transmission dropped to 0.68 | [JC, Paco, Yuta]
It seems like PMC transmission
(C1:PSL-PMC_PMCTRANSPD) dropped to ~0.68 |
|
|
17389
|
Tue Jan 10 15:07:33 2023 |
JC | Update | General | Clean Large Optical Table | I have been working on cleaning the large
optical table next to the PSL table. I have
placed the known optics along in the optical |
|
|
17388
|
Mon Jan 9 19:41:01 2023 |
Anchal | Update | SUS | Null stream (butterfly/pringle) row added and DQed | I updated the suspension model (/cvs/cds/rtcds/userapps/trunk/sus/c1/models/lib/sus_single_control_new.dml)
to add a 5th row in the input matrix so that
we can put in the calculated NULL stream |
|
|
17387
|
Thu Jan 5 14:30:32 2023 |
Paco | HowTo | DAQ | nds2 server restart | After being unable to fetch data offsite
using the nds40 server, I found enlightment
here. |
|
|
17386
|
Wed Jan 4 17:15:41 2023 |
Koji | Configuration | CDS | unknown dhcp request to fb1 | The dhcpd error on the log file stopped
when the yellow (DAQ) ethernet cable was
removed. With Chris's permission I left |
|
|
17385
|
Wed Jan 4 15:10:19 2023 |
Koji | Configuration | CDS | unknown dhcp request to fb1 | Jamie reported that:
The logs (/var/log/daemon.log)
on fb1 are filling with this line: |
|
|
17384
|
Wed Jan 4 12:12:57 2023 |
Paco | Summary | Calibration | ALS calibration error from DFD | [Paco, Anchal]
One of the crucial and currently
limiting calibration errors is in the ALS |
|
|
17383
|
Wed Jan 4 08:52:11 2023 |
JC | Update | OPLEV Tables | ETMX laser has died | Koji mentioned to me that this laser has
a degraded output. I removed this replacement
laser and put in a new laser from the Y Arm |
|
|
17382
|
Tue Jan 3 17:41:55 2023 |
Koji | Update | CDS | Chiara local backup | Chris modified the fstab so that the disk
is automatically mounted. The key was that
these two disks have an identical UUID and |
|
|
17381
|
Tue Jan 3 16:11:05 2023 |
Koji | Update | CDS | Chiara local backup | I checked how the local backup of our /cvs/cds
is done. The last backup was taken on 2022-12-15
and it kept failing since 2022-12-16. |
|
|
17380
|
Tue Jan 3 15:28:12 2023 |
JC | Update | OPLEV Tables | ETMX laser has died | Seems that the ETMX laser died over the
break and took an extended vacation. I swapped
the laser out with one Koji would use to |
|
|
17379
|
Tue Jan 3 12:10:46 2023 |
Jamie | Update | CDS | Yearly DAQD fix 2023, did not work :( | This
whole procedure is no longer needed after
the CDS upgrade. We don't do things |
|
|
17378
|
Tue Jan 3 11:32:32 2023 |
Anchal | Update | CDS | Yearly DAQD fix 2023, did not work :( | Every year some changes need to be done
manually in a driver c code file for daqd
to work. The gpstime offset needs to be changed |
|
|
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 |
|