| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15871
|
Fri Mar 5 16:24:24 2021 |
gautam | Update | LSC | REFL55 demod board re-installed in 1Y2 | I don't have a good explanation why,
but I too measured similar numbers to what
Koji measured. The overall conversion gain |
|
|
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. |
|
|
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. |
|
|
15868
|
Fri Mar 5 15:03:28 2021 |
gautam | Summary | Electronics | A bunch of electronics received | The PCBs for the D1002593
BIO I/F (5pcs ea of D1001050
and D1001266) |
|
|
15867
|
Fri Mar 5 13:53:57 2021 |
gautam | Update | LSC | REFL55 demod board rework | 0 dBm ~ 0.63 Vpp. I guess there is ~4dB
total loss (3dB from splitter
and 1dB from total excess loss above theoretical |
|
|
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]
|
|
|
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 |
|
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 |
|
|
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/ |
|
|
15862
|
Thu Mar 4 11:59:25 2021 |
Paco, Anchal | Summary | LSC | Watchdog tripped, Optics damped back | Gautam came in and noted that the optics
damping watchdogs had been tripped by a >5
magnitude earthquake somewhere off the coast |
|
|
15861
|
Thu Mar 4 10:54:12 2021 |
Paco, Anchal | Summary | LSC | POY11 measurement, tried to lock Green Yend laser | [Paco, Anchal]
- First ran burtgooey as last time.
- Installed pyepics on base environment |
|
|
15860
|
Wed Mar 3 23:23:58 2021 |
gautam | Update | ALS | Arm cavity scan | I see no evidence of anything radically
different from my PSL table optical
characterization in the IMC transmitted |
|
|
15859
|
Wed Mar 3 22:13:05 2021 |
gautam | Update | LSC | REFL55 demod board rework | After this work, I measured that the orthogonality
was poor. I confirmed on the bench that the
PQW-2-90 |
|
|
15857
|
Wed Mar 3 12:00:58 2021 |
Paco, Anchal | HowTo | IMC | MC_F ASD | [Paco, Anchal]
- Saved BURT backup in /users/anchal/BURTsnaps/
- Copied existing code for mode cleaner |
|
|
15856
|
Wed Mar 3 11:51:07 2021 |
Yehonathan | Update | SUS | OSEM testing for SOSs | I finished testing the OSEMs. I put all
the OSEMs back in the box. The OSEMS were
divided into several bags. I put the OSEM |
|
|
15855
|
Tue Mar 2 19:52:46 2021 |
gautam | Update | LSC | REFL55 demod board rework | There were multiple problems with the REFL55
demod board. I fixed them and re-installed
the board. The TFs and noise measured on |
|
|
15854
|
Tue Mar 2 13:39:31 2021 |
rana | Update | LSC | PRM violin filter excessive? | agreed, seems excessive. I always prefer
bandstop over notch in case the eigenfrequency
wanders, but the bandstop could be made to |
|
|
15853
|
Mon Mar 1 16:27:17 2021 |
gautam | Update | LSC | PRM violin filter excessive? | The PRM violin filter seems very suboptimal
- the gain peaking shows up in the MICH OLTF,
presumably due to the MICH-->PRM LSC output |
|
|
15852
|
Mon Mar 1 12:36:38 2021 |
gautam | Summary | IMC | getting familiar with IMC controls | Pretty minor thing - but PMCT and PMCR
were switched on Quad 2 for whatever reason.
I switched them back because I prefer the |
|
|
15851
|
Mon Mar 1 11:40:15 2021 |
Anchal, Paco | Summary | IMC | getting familiar with IMC controls | [Paco, Anchal]
tl;dr: Done no harm, no
lasting change. |
|
|
15850
|
Sun Feb 28 22:53:22 2021 |
gautam | Update | LSC | more PRMI checks here: what it is ain't exactly clear | I looked into this a bit more and crossed
off some of the points Rana listed. In order
to use REFL 55 as a sensor, I had to fix |
|
|
15849
|
Sun Feb 28 16:59:39 2021 |
rana, gautam | Update | LSC | more PRMI checks here: what it is ain't exactly clear | On Friday evening we checked out
a few more things, somewhat overlapping with
previous tests. All tests done with PRMI |
|
|
15848
|
Sat Feb 27 17:25:42 2021 |
gautam | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | I will try the test of switching out KEPCOs
one at a time for the HP. Given that the
passive RC filter doesn't filter |
|
|
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 |
|
|
15846
|
Fri Feb 26 16:31:02 2021 |
gautam | Update | Electronics | Production version of the HV coil driver tested with KEPCO HV supplies | Koji asked me to test the production version
of the coil driver with the KEPCO HV supplies.
See |
|
|
15845
|
Thu Feb 25 20:37:49 2021 |
gautam | Update | General | Setting modulation frequency and checking IMC offset | The Marconi frequency was tuned by looking
at
The ~3.68 MHz (= 3*f1 - |
|
|
15844
|
Thu Feb 25 16:50:53 2021 |
gautam | Update | General | PRMI sensing matrix | After all the work at the LSC rack over
the last couple of days, I re-locked the
PRMI (ETMs misaligned), and measured the |
|
|
15843
|
Thu Feb 25 14:30:05 2021 |
gautam | Update | CDS | new c1bhd setup - diskless boot | I've set up one 2U server unit received
from KT in the control room area (the fans
in it are pretty loud but other than |
|
|
15842
|
Wed Feb 24 22:13:47 2021 |
Jon | Update | CDS | Planning document for front-end testing | I've started writing up a rough testing
sequence for getting the three new front-ends
operational (c1bhd, c1sus2, c1ioo). Since |
|
|
15841
|
Wed Feb 24 12:29:18 2021 |
gautam | Update | General | Input pointing recovered | While working at the LSC rack, I lost the
input pointing into the IFO (the TT wiring
situation is apparently very fragile, and |
|
|
15840
|
Wed Feb 24 12:11:08 2021 |
gautam | Update | General | Demod char part 3 | I did the characterization discussed at
the meeting today.
RF signal at 100 Hz offset |
|
|
15839
|
Wed Feb 24 11:53:24 2021 |
gautam | Update | General | Demod char part 2 | I measured the noise of the I/F outputs
of all the LSC demodulators. I made the measurement
in two conditions, one with the RF input |
|
|
15838
|
Wed Feb 24 10:23:03 2021 |
Yehonathan | Update | SUS | OSEM testing for SOSs | Continuing with the new rig, I measure
the resistance of the cable leading to the
coil to be 0.08+(0.52-0.08)+(0.48-0.08)=0.9ohm. |
|
|
15837
|
Wed Feb 24 10:09:16 2021 |
yehonathan | Update | SUS | OSEM testing for SOSs | Yes, my phone camera mirrored the image.
Sorry for the confusion.
I see you already uploaded the |
|
|
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:
|
|