| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
16039
|
Fri Apr 16 00:21:52 2021 |
Koji | Update | General | Glue Freezer completely frozen | I was looking at the laser head/amp and
somehow decided to open the glue freezer.
And it was stuck. I've managed to open |
|
|
16056
|
Wed Apr 21 00:08:15 2021 |
Koji | Update | PSL | PSL Table (sort of) covered / HEPA "chimney" | Shutdown Procedure:
PSL Shutter closed / MC Autolocker
disabled / PSL mechanical shutter closed |
|
|
16057
|
Wed Apr 21 01:14:03 2021 |
Koji | Update | PSL | PSL Table (sort of) covered / HEPA "chimney" | I also located the (possible) HEPA filters
in the lab. (Attachments 1~3)
Oh! This is NO-NO! We can't |
|
|
16065
|
Wed Apr 21 13:10:12 2021 |
Koji | Update | General | PSL HEPA Maintenance | It's probably too late to say but there
are/were two boxes. (just for record)
|
|
|
16069
|
Wed Apr 21 19:43:20 2021 |
Koji | Update | PSL | New HEPA speed control | The new HEPA speed controllers are attached
at the middle of the HEPA unit (not at the
edge of the unit)... (Attachment |
|
|
16070
|
Thu Apr 22 01:42:38 2021 |
Koji | Summary | Electronics | HV Supply Comparison | New HV power supply from Company 'M'
has been delivered. So I decided to compare
the noise levels of some HV supplies in the |
|
|
16083
|
Fri Apr 23 19:26:58 2021 |
Koji | Update | PSL | HEPA speed lowered | I believe that there is an internal setting
for the minimum flow, so the flow is not
linear ("0%" is not zero), but |
|
|
16099
|
Thu Apr 29 17:43:16 2021 |
Koji | Update | CDS | RFM | The other day I felt hot at the X end.
I wondered if the Xend A/C was off, but the
switch right next to the SP table was ON |
|
|
16115
|
Mon May 3 23:28:56 2021 |
Koji | Summary | General | Weird gas leakagr kind of noise in 40m control room | I also noticed some sound in the control
room. (didn't open the MP3 yet)
I'm afraid that the hard disk |
|
|
16131
|
Tue May 11 17:43:09 2021 |
Koji | Update | CDS | I/O Chassis Assembly | Did you match the local PC time with the
GPS time? |
|
|
16136
|
Wed May 12 16:53:59 2021 |
Koji | Update | SUS | Mass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI units | No, this is the property of the suspension
assembly. The mass says 10kg
Could you do the same for the testmass |
|
|
16140
|
Fri May 14 03:29:50 2021 |
Koji | Update | Electronics | HV Driver noise test with the new HV power supply from Matsusada | I believe I did the identical test with
the one in [40m
ELOG 15786]. The + input of PA95 was |
|