ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
17155
|
Fri Sep 23 14:10:19 2022 |
Radhika | Update | BHD | BH55 RFPD installed - part I | [Radhika, Paco, Anchal]
I placed a lens in the B-beam
path to focus the beam spot onto the RFPD |
|
|
17156
|
Fri Sep 23 18:31:46 2022 |
rana | Update | BHD | BH55 RFPD installed - part I | A design flaw in these initial LIGO RFPDs
is that the SMA connector is not strain releieved
by mounting to the case. Since it is only |
|
|
17157
|
Fri Sep 23 19:04:12 2022 |
Anchal | Update | BHD | BH55 LSC Model Updates - part III | BH55
I further
updated LSC model today with following changes:
BH55 whitening switch binary |
|
|
17158
|
Fri Sep 23 19:07:03 2022 |
Tega | Update | Computers | Work to improve stability of 40m models running on teststand | [Chris, Tega]
Timing glitch investigation:
Moved dolphin |
|
|
17159
|
Mon Sep 26 11:39:37 2022 |
Paco | Update | BHD | BH55 RFPD installed - part II | [Paco, Anchal]
We followed rana's suggestion
for stress relief on the SMA joint in the |
|
|
17160
|
Tue Sep 27 10:50:11 2022 |
Paco | Update | BHD | calibrated LO phase noise | Locked LO phase to ITMX single bounce beam
at the AS port, using the DCPD (A-B) error
point and actuating on LO1 POS. For this |
|
|
17161
|
Wed Sep 28 16:37:26 2022 |
Paco | Update | BHD | calibrated LO phase noise; update | [yuta, paco]
Update; the high frequency ( >
100 Hz) drop is of course not real and comes |
|
|
17162
|
Wed Sep 28 19:15:56 2022 |
Koji | Update | General | Testing 950nm laser found in trash pile | I don't know what was wrong with the
past setup but the 950nm laser (QPHOTONICS
QFLD-950-3S) just worked fine up to ~300MHz |
|
|
17163
|
Wed Sep 28 21:54:08 2022 |
Paco | Update | BHD | calibrated LO phase noise; update | Repeated the LO phase noise measurement,
this time with the LO - ITMY single
bounce, and a couple of fixes Koji |
|
|
17164
|
Thu Sep 29 15:12:02 2022 |
JC | Update | Computers | Setup the 6 new front-ends to boot off the FB1 clone | [Jamie, Christopher, JC]
This morning we decided to label
the the fiber optic cables. While doing this, |
|
|
17165
|
Thu Sep 29 18:01:14 2022 |
Anchal | Update | BHD | BH55 LSC Model Updates - part IV | More model changes
c1lsc:
BH55_I and BH55_Q are now
being read at ADC_0_14 and ADC_0_15. The |
|
|
17166
|
Fri Sep 30 18:30:12 2022 |
Anchal | Update | ASS | Model Changes | I updated c1ass model today to use PR2
PR3 instead of TT1 TT2 for YARM ASS. This
required changes in c1su2 too. I have split |
|
|
17167
|
Fri Sep 30 20:18:55 2022 |
Paco | Update | BHD | LO phase noise with different actuation points | [Paco, Koji]
We took lo phase noise spectra
actuating on the for different optics-- LO1, |
|
|
17168
|
Sat Oct 1 13:09:49 2022 |
Anchal | Update | IMC | WFS turned on | I turned on WFS on IMC at:
PDT: 2022-10-01 13:09:18.378404
PDT |
|
|
17169
|
Mon Oct 3 08:35:59 2022 |
Tega | Update | IMC | Adding IMC channels to frames for NN test | [Rana]
For the upcoming NN test on the
IMC, we need to add some more channels to |
|
|
17170
|
Mon Oct 3 13:11:22 2022 |
Yehonathan | Update | BHD | Some comparison of LO phase lock schemes | I pushed a notebook and a Finesse model
for comparing different LO phase locking
schemes. Notebook is on https://git.ligo.org/40m/bhd/-/blob/master/controls/compare_LO_phase_locking_schemes.ipynb, |
|
|
17171
|
Mon Oct 3 15:19:05 2022 |
Paco | Update | BHD | LO phase noise and control after violin mode filters | [Anchal, Paco]
We started the day by taking a
spectrum of C1:HPC-LO_PHASE_IN1, |
|
|
17172
|
Tue Oct 4 21:00:49 2022 |
Chris | Update | Computers | Failed takeover attempt with the new front ends | [Jamie, JC, Chris]
Today we made a failed attempt
to take over the 40m hardware with the new |
|
|
17173
|
Thu Oct 6 07:29:30 2022 |
Chris | Update | Computers | Successful takeover attempt with the new front ends | [JC, Chris]
Last night’s CDS
upgrade attempt succeeded in taking over |
|
|
17174
|
Thu Oct 6 11:12:14 2022 |
Anchal | Update | BHD | BH55 RFPD installation complete | [Yuta, Paco, Anchal]
BH55 RFPD installation was still
not complete until yesterday because of a |
|
|
17175
|
Thu Oct 6 12:02:21 2022 |
Anchal | Update | CDS | CDS Upgrade Plan | [Chris, Anchal]
Chris and I discussed our plan
for CDS upgrade which amounts to moving new |
|
|
17176
|
Thu Oct 6 18:50:57 2022 |
Anchal | Summary | BHD | BH55 meas diff angle estimation and LO phase lock attempts | [Yuta, Paco, Anchal]
BH55 meas diff
We
estimated meas diff angle for BH55 today |
|
|
17177
|
Fri Oct 7 20:00:46 2022 |
Koji | Update | IOO | IMC WFS / MC2 SUS glitch | After the CDS upgrade team called for a
day (their work TBD), I took over the locked
IMC to check how it looked like. |
|
|
17178
|
Fri Oct 7 22:45:15 2022 |
Anchal | Update | CDS | CDS Upgrade Status Update | [Chris, Anchal, JC, Paco, Yuta]
|
|
|
17179
|
Sun Oct 9 13:49:49 2022 |
Koji | Update | IOO | IMC WFS / MC2 SUS glitch | The IMC and the IMC WFS kept running for
~2days. 👍
I wanted to look at the trand of |
|
|
17180
|
Mon Oct 10 00:05:24 2022 |
Chris | Update | IOO | IMC WFS / MC2 SUS glitch | Thanks for pointing out that EPICS data
collection (slow channels) was not working.
I started the service that collects these |
|
|
17181
|
Mon Oct 10 10:14:05 2022 |
Chris | Update | CDS | CDS Upgrade remaining issues | List of remaining tasks to iron out various
wrinkles with the upgrade:
Complete the upgrade on |
|
|
17182
|
Tue Oct 11 10:58:36 2022 |
Chris | Update | CDS | CDS Upgrade remaining issues | The original fb1 now boots from its new
drive, which is installed in a fixed drive
bay and connected via SATA. There are no |
|
|
17183
|
Tue Oct 11 11:27:58 2022 |
Koji | Update | CDS | CDS Upgrade remaining issues | Perhaps 1PPS around the PSL was used for
the Rb standard to be locked to the GPS 1PPS.
If |
|
|
17184
|
Tue Oct 11 16:52:42 2022 |
Anchal | Update | IOO | Renaming WFS channels to match LIGO site conventions | [Tega, Anchal]
c1mcs and c1ioo models have been
updated to add new acquisition of data. |
|
|
17185
|
Wed Oct 12 14:01:23 2022 |
Radhika | Update | ASS | Model Changes | [Anchal, Radhika]
We proceeded with the TODO items
from [17166]. |
|
|
17186
|
Wed Oct 12 18:18:16 2022 |
rana | Update | ASS | Model Changes | Although we've usually used this empirical
way to run the alignment, I'd prefer
if we had an analytic / numerical model for |
|
|
17187
|
Thu Oct 13 14:46:34 2022 |
JC | Update | Lab Organization | Lab Cleanup 10/12/2022 | During Wednesday’s lab clean up,
we made a ton of progress in organization.
Our main focus was to tackle CDS debris from |
|
|
17188
|
Thu Oct 13 19:06:42 2022 |
Koji | Update | Lab Organization | Lab Cleanup 10/12/2022 | I have moved the following electronics
/ components to "Section Y10
beneath the tube" |
|
|
17189
|
Thu Oct 13 23:25:22 2022 |
rana | Update | IMC | IMC ASC: summary pages and notes | Tega has kindly made a summary page for
the IMC WFS. Its in a tab on the usual
summary pages. |
|
|
17190
|
Thu Oct 13 23:52:45 2022 |
Koji | Update | IMC | IMC ASC: summary pages and notes | The output matrices have been calculated
on Aug 4, 2022 by me. [40m
ELOG 17060] |
|
|
17191
|
Fri Oct 14 17:04:28 2022 |
Radhika | Update | BHD | BH55 Q abnormality + fix | [Yuta, Anchal, Radhika]
Yesterday we attempted to lock
MICH and BHD using the BH55_Q_ERR signal. |
|
|
17192
|
Sat Oct 15 17:22:56 2022 |
Chris | Update | Optimal Control | IMC alignment controller testing | [Anchal, Radhika, Jamie, Chris]
We conducted a test of three alternative
controllers for the IMC pitch DOFs on Friday. |
|
|
17193
|
Mon Oct 17 11:57:27 2022 |
Chris | Omnistructure | CDS | Timing system monitoring | I started a GPS timing monitor script,
/opt/rtcds/caltech/c1/Git/40m/scripts/cds/tempusTimingMon/tempusTimingMon.py,
which runs inside a docker container on optimus. |
|
|
17194
|
Mon Oct 17 17:42:35 2022 |
JC | HowTo | OPLEV Tables | IMC Reflected beam sketch | I sketched up a quick drawing with estimated
length for the IMC reflected beam. This includes
the distances and focal length. Distances |
|
|
17195
|
Mon Oct 17 20:04:16 2022 |
Anchal | Update | BHD | BH55 RF output amplified | [Radhika, Anchal]
We have added an RF amplifier to
the output of BH55. See the MICH signal on |
|
|
17196
|
Mon Oct 17 22:27:25 2022 |
rana | Update | BHD | BH55 RF output amplified | 1) please remember to follow the loading
and power up instructions to avoid destroying
our low noise RF amplifiers. Its not as easy |
|
|
17197
|
Tue Oct 18 15:24:48 2022 |
Tega | Update | CDS | Rack 1X7 work proposal | |
|
|
17198
|
Tue Oct 18 20:43:38 2022 |
Anchal | Update | Optimal Control | IMC open loop noise monitor | WFS loops were running for past 2 hours
when I made the overall gain slider zero
at: |
|
|
17199
|
Wed Oct 19 09:48:49 2022 |
Anchal | Update | Optimal Control | IMC open loop noise monitor | Turning WFS loops back on at:
PDT: 2022-10-19 09:48:16.956979
PDT |
|
|
17200
|
Wed Oct 19 11:09:20 2022 |
Radhika | Update | BHD | BH55 RF output amplified | [Anchal, Radhika]
We selected a 102K (1 nF) ceramic
capacitor and a 100 uF electrolytic capacitor |
|
|
17201
|
Thu Oct 20 14:13:42 2022 |
yuta | Summary | PSL | PMC and IMC sideband frequencies measured | I measured the sideband frequencies for
PMC and IMC lock (to use it for Mariner PMC
and IMC design). |
|
|
17202
|
Thu Oct 20 19:47:24 2022 |
Tega | Update | CDS | Relocate front-ends to Rack 1X7 | We mounted chiara, all front-end machines
and switches in rack 1x7; reconnected power,
dolphin, onestop and timing cables; and restarted |
|
|
17203
|
Fri Oct 21 10:37:36 2022 |
Anchal | Summary | BHD | BH55 phase locking efforts | After the amplifier was modified with a
capacitor, we continued trying to approach
locking LO phase to in quadrature with AS |
|
|
17204
|
Fri Oct 21 16:15:10 2022 |
yuta | Summary | BHD | LO phase locking with BH55 audio dither trials | [Paco, Yuta]
We are still struggling with locking
LO phase in MICH or ITM single bounce with |
|