| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
13595
|
Wed Jan 31 22:32:11 2018 |
gautam | Update | ALS | ALS signal chain + power budget | Summary:
|
|
|
13596
|
Thu Feb 1 01:24:56 2018 |
gautam | Update | ALS | D0902745 revamp underway | I effected the change to the Audio IF preamp
stage on channels 3 and 4 (Xarm and Yarm
respectively) using the resistors Steve ordered |
|
|
13597
|
Thu Feb 1 15:31:12 2018 |
gautam | Update | ALS | ALS signal chain + power budget | Summary:
A |
|
|
13598
|
Thu Feb 1 16:09:13 2018 |
Kira | Update | PEM | Seismometer can insulation test | After taking the measurements, calibrating
them (approximately), and filterting them,
I created the following plot. The exponential |
|
|
13599
|
Fri Feb 2 00:26:34 2018 |
gautam | Update | ALS | D0902745 revamp underway | I saw some interesting behaviour of the
Audio IF amplifier stage on the demod board
today, by accident. I was testing the board |
|
|
13600
|
Fri Feb 2 13:16:55 2018 |
gautam | Update | ALS | ALS signals whitening switching | While setting up for this measurement,
I noticed something odd with the whitening
switching for the ALS channels. For the usual |
|
|
13601
|
Fri Feb 2 21:12:46 2018 |
Udit Khandelwal | Summary | General | Summary - 2018/02/02 | Tip-Tilt
Suspension CAD:
Discussed with Koji about motivation |
|
|
13602
|
Fri Feb 2 22:47:00 2018 |
Koji | Summary | General | AP1053: Packaging & Performance | I've packaged an AP1053 in a Thorlabs
box. The gain and the input noise level were
measured. It has the gain of ~10 and the |
|
|
13603
|
Fri Feb 2 23:28:13 2018 |
Koji | Update | Computer Scripts / Programs | netgpib data missing / PROLOGIX yellow box (crocetta) not working | I could not understand why 'netgpibdata'
scripts are missing in "scripts/general"
folder on pianosa... Where did they go??? |
|
|
13604
|
Sat Feb 3 13:03:45 2018 |
gautam | Update | Computer Scripts / Programs | netgpib data missing / PROLOGIX yellow box (crocetta) not working | The netgpibdata scripts are now under git
version control at |
|
|
13605
|
Mon Feb 5 12:12:41 2018 |
Kira | Update | PEM | Seismometer can insulation test | Attached the program I used to create the
plot
|
|
|
13606
|
Mon Feb 5 14:11:01 2018 |
gautam | Update | ALS | Huge harmonics in ALS channels | I've been trying to setup for the THD
measuremetn at the LSC rack for a couple
of days now, but am plagued by a problem |
|
|
13607
|
Mon Feb 5 18:04:35 2018 |
Koji | Update | Computer Scripts / Programs | netgpib data missing / PROLOGIX yellow box (crocetta) not working | crochetta was reconfigured to have 192.168.113.108.
It was confirmed that it can be used with
netgpibdata.py |
|
|
13608
|
Mon Feb 5 22:57:28 2018 |
gautam | Update | ALS | Huge harmonics in ALS channels | Did some quick additional checks to figure
out what's going on here.
The SOS/dewhite board for |
|
|
13609
|
Tue Feb 6 11:13:26 2018 |
gautam | Update | ALS | Possible source of ground loop identified | I think I've narrowed down the source
of this ground loop. |
|
|
13611
|
Tue Feb 6 16:58:19 2018 |
Kira | Update | PEM | temperature measurements | I decided to plot the temperatures measured
over two days for the sensor inside the can
and inside the lab just to see if there was |
|
|
13612
|
Tue Feb 6 22:55:51 2018 |
gautam | Update | ALS | Possible source of ground loop identified | [koji, gautam]
We discussed possible solutions |
|
|
13613
|
Wed Feb 7 10:16:26 2018 |
gautam | Update | ALS | ALS signal chain + power budget | After emailing the technical team at Menlo,
I have uploaded the more detailed information
they have given me on our wiki. |
|
|
13614
|
Wed Feb 7 12:35:56 2018 |
Kira | Update | PEM | Seismometer can insulation test | I subtracted out the lab temperature change
during the period of cooling to see if it
would have a significant effect on the time |
|
|
13615
|
Wed Feb 7 15:50:42 2018 |
Steve | Update | VAC | IFO pressure monitoring | Hornet cold cathode gauge analoge output
[ DSub9 pin 3 and 7 ] are wired to go ETMX
Acromag. It was reading 4.9V at 7.8e-6 Torr |
|
|
13616
|
Wed Feb 7 15:51:15 2018 |
gautam | Update | ALS | D0902745 revamp complete | Summary of my tests of the demod boards,
post gain modification:
DC tests (supply voltage, |
|
|
13617
|
Wed Feb 7 16:09:06 2018 |
Steve | Update | SUS | ETMX -15V dc corrected | The ETMX Sorrenson power supply -15V
was running at -13.9V |
|
|
13618
|
Wed Feb 7 17:01:25 2018 |
gautam | Update | PEM | PID test plan | [kira,
gautam] |
|
|
13619
|
Wed Feb 7 19:14:19 2018 |
rana | Update | PEM | PID test plan |
The heater circuit should get its
own dedicated supply.
We do not
want to ever use the old Ref Cav heater for |
|
|
13620
|
Thu Feb 8 00:01:08 2018 |
gautam | Update | CDS | Vertex FEs all crashed | I was poking around at the LSC rack to
try and set up a temporary arrangement whereby
I take the signals from the DAC differentially |
|
|
13621
|
Thu Feb 8 00:33:20 2018 |
gautam | Update | ALS | D990694 characterization / THD measurement plan | I decided to try doing the THD measurement
with a function generator. Did some quick
trials tonight to verify that the measurement |
|
|
13622
|
Thu Feb 8 01:27:16 2018 |
Koji | Update | ALS | D990694 characterization / THD measurement plan | >
So my question is - should we just cut the |
|
|
13623
|
Thu Feb 8 12:00:09 2018 |
gautam | Update | ALS | D990694 is NOT differential receiving | Correcting a mistake |
|
|
13624
|
Thu Feb 8 12:24:37 2018 |
Kira | Update | PEM | PID test plan | Some points before we can set up the can:
Cable length and type
For
the DAC, we can use the LEMO outputs and |
|
|
13625
|
Thu Feb 8 13:13:14 2018 |
gautam | Update | ALS | D990694 pulled out | After labeling all cables, I pulled out
one of the D990694s in the LSC rack (the
one used for the ALS X signals, it is Rev-B1, |
|
|
13626
|
Thu Feb 8 17:32:44 2018 |
Kira | Update | PEM | PID test plan | [Kira, Steve]
We set up a new rail for the Sorensens
(attachment 1) and placed one of them down |
|
|
13627
|
Thu Feb 8 18:10:36 2018 |
gautam | Update | ALS | D990694 pulled out | This is proving much more challenging than
I thought - while Cut #1 was easy to identify
and execute, my initial plan for Cut #2 seems |
|
|
13628
|
Fri Feb 9 13:37:44 2018 |
gautam | Update | ALS | THD measurement trial | I quickly put together some code that calculates
the THD from CDS data and generates a plot
(see e.g. Attachment #1). |
|
|
13629
|
Fri Feb 9 15:29:32 2018 |
Kira | Update | PEM | PID test plan | [Kira, Steve]
We installed and labeled the
Sorensens today. |
|
|
13630
|
Mon Feb 12 14:56:00 2018 |
Steve | Update | safety | crane inspection 2018 | Our 3 cranes passed professional
inspection. Fred Goodbar of Konacrane with
450 lbs load at full extension. |
|
|
13631
|
Tue Feb 13 21:22:44 2018 |
Steve | Update | SEI | one load cells tested | Gautam and Steve,
The "called 225 lbs"
steel crane load measured right on 102 kg |
|
|
13632
|
Tue Feb 13 22:35:21 2018 |
gautam | Update | Electronics | PSL table power supply cleanup | The main motivation
for this work is that I want +15VDC power |
|
|
13633
|
Wed Feb 14 17:49:22 2018 |
gautam | Update | Electronics | PSL table power supply cleanup | [steve,
gautam] |
|
|
13634
|
Thu Feb 15 16:03:57 2018 |
Kira | Update | PEM | PID test plan | I checked channels 6 and 7 on the ADC and
they have long wires leading to BNC ends
and are currently not being used, so we could |
|
|
13635
|
Fri Feb 16 01:09:55 2018 |
gautam | Update | ALS | EX green locking duty cycle | I have been puzzled as to why the duty
cycle of the EX
green locks are much |
|
|
13636
|
Fri Feb 16 01:34:40 2018 |
gautam | Update | ALS | D0902745 in-situ testing | Having implemented the changes to the audio
amplifier stage, I re-installed this unit
at the LSC rack, and did some testing. |
|
|
13637
|
Fri Feb 16 15:57:58 2018 |
Steve | Update | VAC | TP3 drypump replaced | The forline pressure of TP3 was 399 mTorr
It was replaced this morning at
TP3 controller 134,638hrs with the "failed |
|
|
13638
|
Fri Feb 16 21:03:17 2018 |
Udit Khandelwal | Summary | General | Summary 2018/02/16 | 40m Lab Cad:
Updated the dimensions of and fleshed
out the chambers in greater detail, by referring |
|
|
13639
|
Fri Feb 16 22:15:30 2018 |
gautam | Update | General | c1mcs model restarted | c1mcs
had died for some reason. Looking at dmesg, |
|
|
13640
|
Fri Feb 16 22:19:07 2018 |
gautam | Update | General | Fibel ALS input polarization tuning | After discussing with Koji, I decided to
try and align the input beam polarization
at the PSL fiber coupler to one of the special |
|
|
13641
|
Mon Feb 19 14:27:25 2018 |
gautam | Update | General | Fibel ALS input polarization tuning | Summary:
Current configuration of PSL free-space
to fiber coupling is: |
|
|
13642
|
Tue Feb 20 13:59:30 2018 |
Koji | Update | General | Modulation depth measurement for an aLIGO EOM | Last night I worked at the PSL table for
the modulation depth measurement for an aLIGO
EOM. Let me know if the IFO behavior is unusual. |
|
|
13643
|
Tue Feb 20 21:14:59 2018 |
gautam | Update | CDS | RFM network errors | I wanted to lock the single arm POX/POY
config to do some tests on the BeatMouth.
But I was unable to. |
|
|
13644
|
Tue Feb 20 23:08:27 2018 |
gautam | Update | ALS | D0902745 in-situ testing | Attachment #1 shows
the ALS noise measurement today. Main differences
from the spectrum posted last week is that |
|
|
13645
|
Wed Feb 21 00:04:27 2018 |
gautam | Update | Electronics | Temporary RF power monitor setup | I made a voltage divider using a 20.47kohm
and 1.07kohm (both values measured with a
DMM). The whole thing is packaged inside |
|