| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15685
|
Mon Nov 23 14:52:10 2020 |
Koji | Update | BHD | BHD MMT Optics delivered | Basically, they repeated our specs and
showed the coating performances for HR/AR
for 10deg P and PR/AR for 45deg P. There |
|
|
15687
|
Mon Nov 23 23:27:43 2020 |
Koji | Summary | ASC | Q3000 characterization | Last week and this week I've been working
on the characterization of the Q3000 QPDs.
The QPDs were named 81, 82, 83, and 94. |
|
|
15702
|
Thu Dec 3 13:55:52 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | I got a bit confused by your description.
The demod board claims
that the nominal power at each LO port is |
|
|
15705
|
Thu Dec 3 21:14:38 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | Let's use RG405 for better shielding.
It is not too stiff. The bending (just
once) does not break the cable. |
|
|
15707
|
Fri Dec 4 03:02:40 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | 1. That's true. But we are already
in that regime with the Var attn at 0dB,
aren't we? We can reduce the input to |
|
|
15708
|
Fri Dec 4 15:58:22 2020 |
Koji | Update | IOO | WFS2 broken | I checked the backplane connection for
IMC WFS2 and found that the
cables for IMC WFS2 and the IMC demod were |
|
|
15709
|
Fri Dec 4 19:23:40 2020 |
Koji | Update | Electronics | AA/AI board testing ongoing | I have the setup built for the AA/AI board
testing around the PD testing area. Please
let me leave it like that for a week or so. |
|
|
15740
|
Sat Dec 19 02:42:56 2020 |
Koji | Update | | New SMA cables on order | Our favorite (flexible) RF cable is Belden's
1671J (Jacketed solder-soaked coax cable).
It is compatible RG405. I'm not sure |
|
|
15747
|
Sun Jan 3 16:26:06 2021 |
Koji | Update | SUS | IMC WFS check (Yet another round of Sat. Box. switcharoo) | I wanted to check the functionality of
the IMC WFS. I just turned on the WFS servo
loops as they were. For the past two hours, |
|
|
15753
|
Thu Jan 7 20:07:27 2021 |
Koji | Update | ALS | Noisy ALS | How about resurrecting the PSL table green
beat for the X arm to see if the non-fiber
setup shows the same level of the freq noise |
|
|
15755
|
Thu Jan 7 23:25:19 2021 |
Koji | Update | ALS | Noisy ALS | If the sensing noise level of the end PDH
degraded for some reason, it'd make the
out of loop stability worse without making |
|
|
15790
|
Tue Feb 2 18:24:54 2021 |
Koji | Update | BHD | SOS assembly | You can remove the components of the optical
table enclosure (black ones) and use the
optical table as your working area too. |
|
|
15791
|
Tue Feb 2 23:29:35 2021 |
Koji | Update | CDS | CDS crash and CDS/IFO recovery | I worked around the racks and the feedthru
flanges this afternoon and evening. This
inevitably crashed c1lsc real-time process. |
|
|
15794
|
Wed Feb 3 18:53:31 2021 |
Koji | Update | CDS | CDS crash and CDS/IFO recovery | Really!? I didn't reboot the machines
between "sudo date" and "rtcds
start c1x0*". I tried rtcds. If it didn't |
|
|
15801
|
Wed Feb 10 17:18:03 2021 |
Koji | Summary | BHD | Satellite Amplifier Output Offset measurements | Testing the satellite amp i.e.
PD driver
- To test the noise of the PD transimpedance |
|
|
15810
|
Tue Feb 16 15:29:01 2021 |
Koji | Update | BHD | SOS assembly | The curie temp of SmCo seems about x2 (in
K) of the one for NdFeB. i.e. 600K vs 1000K.
So I believe 177degC = 450K is not an issue. |
|
|
15813
|
Wed Feb 17 13:59:43 2021 |
Koji | Update | SUS | CoM on 3"->2" Adapter Ring for SOS | Note from today's meeting:
1. Can we adjust the thickness of |
|
|
15815
|
Thu Feb 18 03:20:09 2021 |
Koji | Summary | Electronics | Current Rack Map | For your planning: |
|
|
15819
|
Thu Feb 18 20:20:25 2021 |
Koji | Update | SUS | aLIGO Sat Amp characterization | Yeah, it's really inconsistent. You
had 35mA LED drive and the current noise
of the noisy channel was 5e-7 A/rtHz at 1Hz. |
|
|
15820
|
Thu Feb 18 20:24:48 2021 |
Koji | Summary | Electronics | A bunch of electronics received | Todd provided us a bunch of electronics.
I went to Downs to pick them up this afternoon
and checked the contents in the box. Basically, |
|
|
15824
|
Fri Feb 19 16:06:01 2021 |
Koji | Update | SUS | CoM Range on 3"->2" Adapter Ring for SOS | We want to move the CoM with the adjustment
range so that the residual deviation is adjusted
by the bottom dumbbell. 0.0003" is well |
|
|
15826
|
Fri Feb 19 16:55:26 2021 |
Koji | Update | SUS | CoM Range on 3"->2" Adapter Ring for SOS | Jordan's screenshot actually shows
that the vertical distance (Y) is 0.0000".
We want to have the vertical distance of |
|
|
15830
|
Sat Feb 20 16:46:17 2021 |
Koji | Summary | Electronics | A bunch of electronics received | We received currently available sets. We
are supposed to receive more coil drivers
and sat amps, etc. But they are not ready |
|
|
15835
|
Tue Feb 23 20:55:19 2021 |
Koji | Update | SUS | OSEM testing for SOSs | I can't obtain a consistent view between
the existing drawings/photographs and your
pin assignment. Please review the pin assignment |
|
|
15836
|
Tue Feb 23 23:12:37 2021 |
Koji | Summary | SUS | SUS invacuum wiring | This is my current understanding
of the in-vacuum wiring:
1. Facts |
|
|
15847
|
Fri Feb 26 20:20:43 2021 |
Koji | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | This is very disappointing. Even with KEPCO
linear supply with the improved HV driver
circuit, the noise level is significantly |
|
|
15863
|
Thu Mar 4 15:48:26 2021 |
Koji | Summary | PEM | Watchdog tripped, Optics damped back | EQs seen on Summary pages
https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20210304/pem/seismic_blrms/ |
|
|
15864
|
Thu Mar 4 23:16:08 2021 |
Koji | Update | LSC | REFL55 demod board rework | A new hybrid splitter (DQS-10-100) was
installed. As the amplification of the final
stage is sufficient for the input level of |
|
|
15865
|
Thu Mar 4 23:57:35 2021 |
Koji | Summary | Electronics | Inspection of the new custom dsub cables | I made the inspection of the new custom
DSub cables (came from Texas).
The shelled version gives us some |
6x |
|
15866
|
Fri Mar 5 00:53:09 2021 |
Koji | Summary | Electronics | A bunch of electronics received | Received additional front/rear panels.
Updated the original entry and Wiki [Link]
|
|
|
15869
|
Fri Mar 5 15:31:23 2021 |
Koji | Update | LSC | REFL55 demod board rework | Missed to note: The IF test was done at
TP7 and TP6 using pomona clips i.e. brefore
the preamp. |
|
|
15870
|
Fri Mar 5 15:32:53 2021 |
Koji | Summary | Electronics | A bunch of electronics received | The parts will be ordered by Koji
The components for the additional BIO I/F
have been ordered. |
|
|
15885
|
Tue Mar 9 12:41:29 2021 |
Koji | Summary | Electronics | Investigation on the invacuum Dsub cables | I believe the aLIGO style invac dsub cables
and the conventional 40m ones are incompatible.
While the aLIGO spec is that Pin1 |
|
|
15888
|
Tue Mar 9 15:19:03 2021 |
Koji | Update | SUS | OSEM testing for SOSs | How were the statistics of them? i.e. #
of Good OSEMs, # of OK OSEMs, etc... |
|
|
15889
|
Tue Mar 9 15:22:56 2021 |
Koji | Summary | SUS | PRM suspension | I just saw the PRM watchdog tripped
at ~15:20 local (23:20UTC). I restored
the PRM but I saw only the side watchdog |
|
|
15901
|
Thu Mar 11 02:10:06 2021 |
Koji | Summary | BHD | BHD Platform vertical dimentions | Stephen and I discussed the nominal heights
of the BHD platform components.
The beam height from the |
|
|
15907
|
Fri Mar 12 03:08:23 2021 |
Koji | Summary | SUS | Coil Rs & Ls for PRM/BS/SRM | Summary
Per Gautam's request, I've
checked the coil resistances and inductances. |
|
|
15908
|
Fri Mar 12 03:22:45 2021 |
Koji | Update | General | Gaussmeter in the electronics drawer | For magnet strength measurement:
There is a gaussmeter in the flukes'
drawer (2nd from the top). It turns on and |
|
|
15909
|
Fri Mar 12 03:23:37 2021 |
Koji | Update | BHD | DO card (DO-32L-PE) brought from WB | I've brought 4 DO-32L-PE cards from
WB for BHD upgrade for Jon. |
|
|
15910
|
Fri Mar 12 03:28:51 2021 |
Koji | Update | CDS | cds reboot | I want to emphasize the followings:
FB's RTC (real-time
clock/motherboard clock) is synchronized |
|
|
15923
|
Tue Mar 16 16:02:33 2021 |
Koji | Update | LSC | REFL11 demod retrofitting | I'm going to remove REFL11 demod for
the noise check/circuit improvement.
---- |
|
|
15936
|
Thu Mar 18 07:02:27 2021 |
Koji | Update | LSC | REFL11 demod retrofitting | Attachment 1: Transfer Functions
The original circuit had a gain
of ~20 and the phase delay of ~1deg at 10kHz, |
|
|
15980
|
Wed Mar 31 00:40:32 2021 |
Koji | Update | Electronics | Electronics Packaging for assembly work | I've worked on packing the components
for the following chassis
- 5 16bit AI chassis |
|
|
15981
|
Wed Mar 31 03:56:37 2021 |
Koji | Summary | Electronics | A bunch of electronics received | We have received 9x 18bit DAC adapter boards
(D1000654) |
|
|
15986
|
Thu Apr 1 18:16:28 2021 |
Koji | Update | Electronics | Electronics Packaging for assembly work | All small
components are packed in the boxes. They
are ready to ship.
|
|
|
15989
|
Thu Apr 1 23:55:33 2021 |
Koji | Summary | General | HEPA AC cord replacement | I think
the PSL HEPA (both 2 units) are not running.
The switches were on. And the variac was |
|
|
16002
|
Tue Apr 6 21:17:04 2021 |
Koji | Summary | General | PSL HEPA investigation | - Last week we found both of the PSL HEPA
units were not running.
- I replaced the capacitor of the |
|
|
16003
|
Wed Apr 7 02:50:49 2021 |
Koji | Update | SUS | Flange Inspections | Basically I went around all the chambers
and all the DB25 flanges to check the invac
cable configurations. Also took more time |
|
|
16008
|
Thu Apr 8 20:58:17 2021 |
Koji | Update | CDS | ADC adapter boards assembly | 5x 16bit ADC adapter boards (D0902006)
assembled. |
|
|
16038
|
Thu Apr 15 18:33:39 2021 |
Koji | Update | CDS | More 16bit ADC adapter boards | We received 10x 16bit ADC adapter boards
from Todd. S2100687~S2100696
The number of soldered resistors |
|