| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15003
|
Wed Oct 30 23:12:27 2019 |
Koji | Update | SUS | PRM suspension issues | Sigh... hard loch |
|
|
15002
|
Wed Oct 30 19:20:27 2019 |
gautam | Update | SUS | PRM suspension issues | While I was trying to lock the PRMI this
evening, I noticed that I couldn't move
the REFL beamspot on the CCD field of view |
|
|
15001
|
Wed Oct 30 17:08:40 2019 |
gautam | Update | LSC | POP22 investigation | The POP beam coming out of the vacuum chamber
is split by a 50/50 BS and half is diverted
to the POP22/POP110/POPDC photodiode (Thorlabs |
|
|
15000
|
Wed Oct 30 11:53:41 2019 |
gautam | Update | LSC | MICH loop shape tuning | I changed the shape of the low pass filter
to reduce high frequency sensor noise injection
into the MICH control signal. The loop stability |
|
|
14999
|
Wed Oct 30 01:27:00 2019 |
gautam | Update | LSC | More locking updates | Tried a bunch of things tonight.
Modified the "ELP300"
filter module in the MICH filter bank - this |
|
|
14998
|
Tue Oct 29 17:40:48 2019 |
gautam | Update | LSC | More locking updates | I set up a photodiode (PDA10CF) in the
IFO REFL beampath and the Agilent NA is sitting
on the east side of the PSL enclosure. This |
|
|
14997
|
Tue Oct 29 15:13:19 2019 |
gautam | Update | LSC | More locking updates | I looked at some signals for a 10 second
period when the PRMI was locked with at some
CARM offset, just before the PRMI lost lock, |
|
|
14996
|
Tue Oct 29 01:24:45 2019 |
gautam | Update | LSC | More locking updates | Summary:
The two arm lengths can
be controlled reliably in the CARM/DARM basis |
|
|
14995
|
Mon Oct 28 23:20:11 2019 |
gautam | Update | ALS | ALS power budget |
IR |
|
|
14994
|
Mon Oct 28 18:55:06 2019 |
rana | Update | Computers | rossa revival | back
on new Rossa from Xi computing
switched to using Display |
|
|
14993
|
Fri Oct 25 01:04:49 2019 |
gautam | Update | ALS | ALS electronics chain was saturating | [Koji, gautam]
Summary:
We think we got to the bottom of |
|
|
14992
|
Thu Oct 24 18:37:15 2019 |
gautam | Update | PEM | T240 checkout | Summary:
The Trillium T240 seismometer
needs |
|
|
14991
|
Thu Oct 24 11:58:16 2019 |
gautam | Update | ASC | PRC angular feedforward | Summary:
I'd like to revive the PRC
angular feedforward system. However, |
|
|
14990
|
Wed Oct 23 18:40:58 2019 |
gautam | Update | CDS | another round of vertex FE reboots | I wanted to restart the c1oaf model. As
usual, the first time the model was restarted,
it came back online with a 0x2bad error. |
|
|
14989
|
Wed Oct 23 11:49:21 2019 |
gautam | Update | PEM | PEM BLRMS anomaly | I looked into the seismometer situation
a bit more today. Here is the story so far
- I think more investigation is required: |
|
|
14988
|
Wed Oct 23 11:14:21 2019 |
gautam | Update | ASC | PRMI ASC with QPD signals normalized. | Attachment #1 - comparison
of the POP QPD PIT and YAW output signal
spectra with and without them being |
|
|
14987
|
Wed Oct 23 11:11:01 2019 |
gautam | Update | ALS | EX uPDH electronics checkout | The closest thing I can think of is here.
|
|
|
14986
|
Wed Oct 23 10:23:26 2019 |
rana | Update | ALS | EX uPDH electronics checkout | During our EX AM/PM setups, I don't
think we bumped the PDH gain knob (and I
hope that the knob was locked). Possible |
|
|
14985
|
Tue Oct 22 17:35:30 2019 |
gautam | Update | ASC | PRMI ASC - first pass | I made a change to the c1ass model to normalize
the PIT and YAW POP QPD outputs by the SUM
channel. A saturation block is used to prevent |
|
|
14984
|
Tue Oct 22 15:32:15 2019 |
gautam | Update | ALS | EX uPDH electronics checkout | Summary:
The EX PDH setup had what I thought
was insufficient phase and gain margins. |
|
|
14983
|
Tue Oct 22 00:52:27 2019 |
gautam | Update | LSC | Locking updates |
Transition of arms from POX/POY
to CARM/DARM was much smoother today - a
change was made at the EX PDH setup, see |
|
|
14982
|
Mon Oct 21 16:02:21 2019 |
gautam | Update | SUS | ETMX over the weekend | Looking at the sensor and oplev trends
over the weekend, there was only one event
where the optic seems to have been macroscopically |
|
|
14981
|
Mon Oct 21 12:25:46 2019 |
gautam | Update | ALS | DFD electronics checkout | Summary:
There are no unexpected red-flags
in the performance of the DFD electronics. |
|
|
14980
|
Mon Oct 21 11:44:19 2019 |
gautam | Update | safety | Interlock reconnected to Innolight controller | We also took this opportunity to re-connect
the interlock to the Innolight controller
(after it was disconnected for diagnosing |
|
|
14979
|
Fri Oct 18 20:21:33 2019 |
shruti | Update | ALS | AM measurement attempt at X end | [Shruti, Rana]
- At the X end, we set up the network
analyzer to begin measurement of the AM transfer |
|
|
14978
|
Fri Oct 18 18:13:55 2019 |
Koji | Update | safety | Laser interlock looks OK | I've checked the state of the laser
interlock switch and everything looked normal. |
|
|
14977
|
Fri Oct 18 17:35:07 2019 |
gautam | Update | SUS | ETMX sat box disconnected | Koji suggested systematic investigation
of the ETMX suspension electronics. The tests
to be done are: |
|
|
14976
|
Thu Oct 17 16:49:53 2019 |
gautam | Update | ASC | PRMI ASC - first pass | I tried implementing a basic PRMI ASC using
the POP QPD as a sensor. The POP22
buildup RMS is reduced by a factor of a few. |
|
|
14975
|
Thu Oct 17 12:34:51 2019 |
gautam | Update | General | Daytime wishlist | Some ideas that would help increase the
locking duty-cycle in the short term.
Seismometer investigation |
|
|
14974
|
Thu Oct 17 11:19:28 2019 |
gautam | Update | LSC | Locking activity last night |
Tuning the MICH-->PRM
output matrix element
Locked
the PRMI with the carrier field resonant |
|
|
14973
|
Wed Oct 16 11:42:17 2019 |
gautam | Update | LSC | Poor separation of PRCL/MICH in 3f signals | Summary:
There is poor separation
of the PRCL and MICH length error signals |
|
|
14972
|
Tue Oct 15 17:22:26 2019 |
gautam | Update | General | Workstation computers back on UPS | Batteries + power cables replaced, and
computers back on UPS from today ~3pm.
|
|
|
14971
|
Tue Oct 15 17:19:38 2019 |
Koji | Update | General | Wednesday cleaning work | [Liz, Gautam, Chub, Jordan, Koji]
We removed a significant
amount of e-waste from the lab. |
|
|
14970
|
Mon Oct 14 17:32:28 2019 |
Koji | Update | CDS | Portal Elog entry for the recent CM servo board tests | Updated Circuit Diagram and photos:
https://dcc.ligo.org/D1500308-v2
- (1) and (6) of the diagram: |
|
|
14969
|
Mon Oct 14 17:24:28 2019 |
gautam | Update | General | Workstation computers taken off UPS (temporarily) | The UPS is now incessantly beeping. I cannot
handle this constant sound so I shut down
all the control room workstations and moved |
|
|
14968
|
Mon Oct 14 16:34:42 2019 |
Koji | Update | CDS | CM servo board testing | Input referred offsets on the IN1/IN2 were
tested with different gain settings. The
two inputs were plugged by the 50 ohm terminators. |
|
|
14967
|
Mon Oct 14 16:25:03 2019 |
Koji | Update | CDS | CM servo board testing | The output stage (and AO GAIN stage) of
the MC board was modelled. The transfer function
was measured with the injection from EXC |
|
|
14966
|
Mon Oct 14 16:19:30 2019 |
Koji | Update | CDS | CM servo board testing | For the CM board modeling purpose, the
transfer function from TESTA2 to TESTB2 was
needed. (Attachment 1) |
|
|
14965
|
Mon Oct 14 16:06:28 2019 |
Koji | Update | CDS | CM servo board testing | CM Board Slow out (digital length control)
path transfer function / pole-zero filter
pair (79Hz/1.6kHz) transfer function |
|
|
14964
|
Thu Oct 10 23:36:02 2019 |
Koji | Update | General | Wednesday cleaning work | [Jon, Yehonathan, Gautam, Aaron,
Shruti, Koji]
We get together on Wednesday afternoon |
|
|
14963
|
Thu Oct 10 22:11:53 2019 |
gautam | Update | LSC | Trans QPD checkout |
I removed the flip-mount that was
installed on the EY in-air table for the
mode-spectroscopy project (see |
|
|
14962
|
Thu Oct 10 01:12:56 2019 |
gautam | Update | LSC | Locking studies | Summary:
ALS control of arms in
the CARM/DARM basis seems pretty robust - |
|
|
14961
|
Wed Oct 9 22:02:58 2019 |
gautam | Update | LSC | REFL55 whitening issue | This
problem has re-surfaced. Is this indicative
of some problem with the on-board VGA? Even |
|
|
14960
|
Wed Oct 9 18:15:26 2019 |
gautam | Update | LSC | PRMI 3f locking | After making sure the beams were hitting
the 3f photodiodes on the "AP"
table, I was able to lock the PRMI with the |
|
|
14959
|
Wed Oct 9 12:15:05 2019 |
rana | Update | Electronics | WFS head RF measurements | It would be good if you and Shruti can
look at how to change the parameters in Zero
so as to do a fit to the measured data. Usually, |
|
|
14958
|
Wed Oct 9 09:37:28 2019 |
aaron | Update | IOO | WFS loop measurements | I installed nds2 again, this time successfully
with
|
|
|
14957
|
Tue Oct 8 20:39:42 2019 |
aaron | Update | IOO | WFS loop measurements | I installed nds2 on donatello with
yum, but still can't import nds2. |
|
|
14956
|
Tue Oct 8 20:23:03 2019 |
gautam | Update | CDS | c1iscaux testing | Looking at the old latch.st code, looks
like this is just a heartbeat signal to indicate
the code is alive. I'll implement this. |
|
|
14955
|
Tue Oct 8 18:42:39 2019 |
Koji | Update | CDS | CM servo board testing | The boost filters of the CM servo
board were tested. Their ZPK models were
made. |
|
|
14954
|
Tue Oct 8 18:35:09 2019 |
gautam | Update | LSC | Locking prep | In preparation for some locking work tonight,
I did the following at the POP in air table
with the PRMI locked on carrier: |
|