| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
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 |
|
|
15834
|
Tue Feb 23 00:10:05 2021 |
gautam | Update | General | Demod char part 1 | I measured the conversion efficiencies
for all the RFPD demod boards except the
POP port ones. An RF source was used to drive |
|
|
15833
|
Mon Feb 22 14:53:47 2021 |
gautam | Update | CDS | dtt-ezca-tools installed on rossa | The defaults cds-crtools didn't come
with some of the older ezcautils (like ezcaread,
ezcawrite etc). This is now packaged for |
|
|
15832
|
Mon Feb 22 14:06:49 2021 |
Yehonathan | Update | SUS | OSEM testing for SOSs | Continuing with the OSEM testing. I measure
the resistance of the wires from the RLC
meter to the coil to be ~ 0.9ohm. I will |
|
|
15831
|
Sun Feb 21 20:51:21 2021 |
rana | Update | General | Housekeeping + PRMI char | I'm curious to see if the demod phase
for MICH in REFL & AS chamges between
thi simple Mcihelson and PRMI. IF there's |
|
|
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 |
|
|
15829
|
Sat Feb 20 16:20:33 2021 |
gautam | Update | General | Housekeeping + PRMI char | In prep to try some of these
debugging steps, I did the following.
ndscope updated from 0.7.9 to |
|
|
15828
|
Sat Feb 20 10:01:48 2021 |
gautam | Summary | Electronics | A bunch of electronics received | Will we also be receiving the additional
34 Satellite Amplifier PCBs? |
|
|
15827
|
Fri Feb 19 18:22:42 2021 |
rana | Update | LSC | PRFPMI sensiing matrix woes | I would:
look at the free swingin
michelson. Should be able tu null that siggnal |
|
|
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 |
|
|
15825
|
Fri Feb 19 16:14:16 2021 |
gautam | Update | SUS | CoM Range on 3"->2" Adapter Ring for SOS | I briefly talked with Jordan about this.
This suspension will have OSEMs right? With
400ohm series resistance for the coil drivers, |
|
|
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 |
|
|
15823
|
Fri Feb 19 15:17:51 2021 |
Jordan | Update | SUS | CoM Range on 3"->2" Adapter Ring for SOS | Adjusting the thickness of the cylindrical
hole for the mirror on the 2" optic
sleeve, from .6875" to .61" thick, |
|
|
15822
|
Fri Feb 19 13:38:26 2021 |
gautam | Update | LSC | PRFPMI | I forgot that I had already done some investigation
into recovering the PRFPMI lock after my
work on the RF source. I don't really |
|
|
15821
|
Fri Feb 19 12:21:04 2021 |
Yehonathan | Update | BHD | SOS assembly | A summary of things that need to be fabricated/purchased/done:
|
|
|
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, |
|
|
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. |
|
|
15818
|
Thu Feb 18 18:05:04 2021 |
gautam | Update | SUS | aLIGO Sat Amp characterization | Before installation, I performed a bunch
of tests on the aLIGO sat amp. All the measurements
were made with the dummy suspension box substituting |
|
|
15817
|
Thu Feb 18 15:33:21 2021 |
gautam | Update | SUS | aLIGO Sat Amp installed, powered and commissioned | The WFS servo was recommissioned. The matrix
can be tuned a bit more, but for now, I've
recovered the old performance and the alignment |
|
|
15816
|
Thu Feb 18 15:15:12 2021 |
yehonathan | Update | SUS | OSEM testing for SOSs | I am setting up a testing rig for the OSEMs
we recently obtained. I found the schematic
for the OSEM assembly from which the pin |
|
|
15815
|
Thu Feb 18 03:20:09 2021 |
Koji | Summary | Electronics | Current Rack Map | For your planning: |
|
|
15814
|
Wed Feb 17 16:11:53 2021 |
gautam | Update | SUS | aLIGO Sat Amp installed, powered | There is some non-trivial sign flipping
in the sensors/coils in this new setup because
it is a hybrid one with the old interfacing |
|
|
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 |
|
|
15812
|
Wed Feb 17 13:59:35 2021 |
gautam | Update | DetChar | Summary pages | The summary pages had failed because of
a conda env change. We are dependent on detchar's |
|
|
15811
|
Tue Feb 16 22:59:36 2021 |
Yehonathan | Update | BHD | SOS assembly | Done.
Also, the magnets are nickel-plated.
I guess that doesn't matter for the baking |
|
|
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. |
|
|
15809
|
Tue Feb 16 14:56:44 2021 |
gautam | Update | SUS | aLIGO Sat Amp installed, powered | [jordan,
gautam]
Ran 60ft long cables from |
|
|
15808
|
Tue Feb 16 13:13:39 2021 |
Yehonathan | Update | BHD | SOS assembly | Gautam pointed out that there are extra
Sm-Co magnets stored in the clean optics
cabinet. |
|
|
15806
|
Fri Feb 12 15:03:48 2021 |
Jordan | Update | SUS | CoM on 3"->2" Adapter Ring for SOS | As it currently stands the Center of Mass
of the Adapter Ring/Optic assembly is 0.0175"
out of the plane formed by the suspension |
|
|
15805
|
Thu Feb 11 18:21:39 2021 |
gautam | Update | SUS | MC suspension glitches | MC1
suspension is glitching again, so
this is a good chance to install the new |
|
|
15804
|
Thu Feb 11 16:58:52 2021 |
rana | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | I expect that a single OSEM channel can't
be better than 1e-10 m/rHz above 5 Hz, so
probably something wrong in the calibration. |
|
|
15803
|
Thu Feb 11 11:10:05 2021 |
Anchal | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | Here is a proper measurement for PD transimpedance
amplifier circuit in the Satellite amplifier
box D1002818 S2100029. The input from rear |
|
|
15802
|
Wed Feb 10 21:14:03 2021 |
gautam | Update | Electronics | Production version of the HV coil driver tested | Summary:
I did what I consider to be a comprehensive
set of tests on the production version of |
|
|
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 |
|
|
15800
|
Wed Feb 10 15:25:45 2021 |
gautam | Summary | BHD | Satellite Amplifier Output Offset measurements | Why not just do this test with the dummy
suspension box and CDS system? I think Rich's
claim was that the intrinsic LED RIN was |
|
|
15799
|
Wed Feb 10 15:07:50 2021 |
Anchal | Summary | BHD | Satellite Amplifier Output Offset measurements | I measured the output DC voltage of the
satellite amplifier box at PDMon port when
the PDA input was shorted |
|
|
15798
|
Wed Feb 10 14:14:58 2021 |
gautam | Update | Electronics | Custom cables received | We received the custom cables to test the
new suspension electronics. They are under
my desk. So we are ready. |
|
|
15797
|
Wed Feb 10 11:45:59 2021 |
Anchal | Summary | BHD | Satellite Amplifier Very Low frequency noise After modifications | As suggested, I wrapped the satellite amplifier
box D10028128 S2100029 in blanket and foam
and took very low frequency spectrum starting |
6x |
|
15796
|
Thu Feb 4 15:14:55 2021 |
Yehonathan | Update | BHD | SOS assembly | I gathered all the components I could find
from the SOS towers and the cleanroom and
put it all on the table next to the flow |
|
|
15795
|
Wed Feb 3 21:28:02 2021 |
gautam | Update | CDS | CDS crash and CDS/IFO recovery | I am just reporting my experience - this
may be a new failure mode but I don't
think so. In the new RTCDS, the ntp server |
|
|
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 |
|
|
15793
|
Wed Feb 3 16:27:19 2021 |
Anchal | Summary | BHD | Satellite Amplifier Transfer Functions and noise After modifications | I have made modifications recommended in
this doc.
The changes made are: |
|
|
15792
|
Wed Feb 3 15:24:52 2021 |
gautam | Update | CDS | CDS crash and CDS/IFO recovery | Didn't get a chance to comment during the
meeting - This was almost certainly
a coincidence. I have never had to do |
|
|
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. |
|
|
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. |
|
|
15788
|
Tue Feb 2 17:09:17 2021 |
yehonathan | Update | BHD | SOS assembly | I set up a working area on the table next
to the south flow bench (see attachment).
I also brought in a rolling table for some |
|
|
15787
|
Tue Feb 2 11:57:46 2021 |
Anchal | Summary | BHD | HAM-A Coil Driver measurements After modifications TF and Noise S2100028 | I have made the modifications on the other
board D1100687 S2100028 as well. The measurements
were taken as mentioned in 40m/15784. |
|
|
15786
|
Mon Feb 1 12:30:21 2021 |
gautam | Update | Electronics | More careful characterization | Summary:
Swapping out the KEPCO
HV supplies (linear) I was using for a pair |
|
|
15785
|
Fri Jan 29 17:57:17 2021 |
Anchal | HowTo | CDS | Acromag wiring investigation | I found a
white paper from Acromag which
discusses how to read differential signal |
|