| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
13674
|
Thu Mar 8 23:50:27 2018 |
gautam | Update | ALS | First look at new ALS electronics |
Locked single arms, dither aligned,
and saved offsets to EPICS (slow) sliders
in anticipation of having to reboot all vertex |
|
|
13673
|
Thu Mar 8 19:38:37 2018 |
gautam | Update | ALS | digital unwhitening of daughter board | I made a LISO fit of the measured TF of
the daughter board, so that I can digitally
invert the daughter board whitening. Results |
|
|
13672
|
Thu Mar 8 18:15:42 2018 |
gautam | Update | General | CDS recovery after work at LSC rack | I was forced into a simultaneous power-cycle
rebooting of the three vertex FEs just now.
I took the opportunity to completely disconnect |
|
|
13671
|
Thu Mar 8 15:23:16 2018 |
gautam | Update | Electronics | New DC power ports at c1lsc | [Koji,
Gautam] |
|
|
13670
|
Thu Mar 8 14:41:25 2018 |
gautam | Update | General | CDS recovery after work at LSC rack | As I had found before,
restarting the c1oaf |
|
|
13669
|
Thu Mar 8 01:10:22 2018 |
gautam | Update | General | CDS recovery after work at LSC rack | This required multiple hard reboots, but
seems like all the RT models are back for
now. The only indicator I can't explain |
|
|
13668
|
Thu Mar 8 00:40:25 2018 |
gautam | Update | ALS | new look ALS electronics - characterization | I am almost ready for a digital test of
the new ALS electronics. Today, Koji and
I spent some time tapping new +/-24VDC DIN |
|
|
13667
|
Wed Mar 7 12:04:14 2018 |
gautam | Update | Electronics | Three opamps walked onto an AA board | Here are the plots. Comments:
Measurement
and model agree quite well |
|
|
13666
|
Mon Mar 5 17:27:34 2018 |
gautam | Update | ALS | new look ALS electronics - characterization | I did a quick test of the noise of the
new ALS electronics with the X arm ALS. Attachment
#1 shows the results - but something looks |
|
|
13665
|
Mon Mar 5 11:58:24 2018 |
gautam | Update | Electronics | Three opamps walked onto an AA board | For testing the new IR ALS noise, we had
decided that we would like to use the differential
output of the demodulated ALS beat signal, |
|
|
13664
|
Mon Mar 5 10:13:21 2018 |
gautam | Update | VAC | vacuum health | In Steve's absence, I've tried
to keep an eye on the health of the vacuum
system. From Attachment #1, the pressure |
|
|
13663
|
Fri Mar 2 01:45:06 2018 |
gautam | Update | ALS | new look ALS electronics | I spent today making another daughter board
(so that we can use the new scheme for I
and Q for one arm), testing it (i.e. measuring |
|
|
13662
|
Wed Feb 28 21:14:34 2018 |
gautam | Summary | PEM | Channel admin | Since we decided to use the Acromag for
readback of the temperature sensor for Kira's
seismometer temperature control, I enabled |
|
|
13661
|
Wed Feb 28 19:13:25 2018 |
gautam | Update | ALS | ADC test for differential receiving in c1lsc | [koji,
gautam]
we did a bunch of tests to figure |
|
|
13660
|
Wed Feb 28 12:31:28 2018 |
Kira | Update | PEM | temp sensor input | I switched out the DIN fuses for the long
cables and it fixed the issue of them
not showing any votage on the other end. |
|
|
13658
|
Tue Feb 27 21:10:45 2018 |
gautam | Update | ALS | Daughter board testing | I thought a little bit about the next steps
in testing the daughter board. The idea is
to install this into the existing 1U chassis |
|
|
13657
|
Mon Feb 26 20:55:56 2018 |
rana | Update | ALS | Daughter board prototyping | Looks good.
* for bypass type applications,
you don't have to use Wima caps (which |
|
|
13656
|
Mon Feb 26 16:22:10 2018 |
Kira | Update | PEM | temp sensor input | [Kira, Gautam]
We began the setup for the lab
temperature sensor today. First, we needed |
|
|
13655
|
Sun Feb 25 00:03:12 2018 |
gautam | Update | ALS | Daughter board prototyping | Using one of the prototype |
|
|
13654
|
Fri Feb 23 20:46:04 2018 |
Udit Khandelwal | Summary | General | CAD Summary 2018/02/23 | I have more or less finished cadding the
test mass chamber by referring to the drawings
Steve gave me. Finer details like lugs and |
|
|
13653
|
Fri Feb 23 07:47:54 2018 |
Steve | Update | VAC | CC1 Hornet | We have the IFO pressure logged again!
Thanks Johannes and Gautam
This |
|
|
13652
|
Thu Feb 22 17:19:47 2018 |
Koji | Update | General | Modulation depth measurement for an aLIGO EOM | aLIGO
EOM test: Setup
The modulation signal was |
|
|
13651
|
Thu Feb 22 16:16:43 2018 |
Kira | Update | PEM | temp sensor input | Rewired the temperature sensor inputs to
Molex connectors so that we can now attach
them to the +/- 15V Sorensens for input instead |
|
|
13650
|
Thu Feb 22 16:11:14 2018 |
Koji | Update | General | aLIGO EOM crystal replacement | aLIGO
EOM crystal replacement
The entire operation has |
|
|
13649
|
Thu Feb 22 10:49:11 2018 |
Steve | Update | Electronics | rack power supplies checked | All rack power supplies labeled if their
load changed.
|
8x |
|
13648
|
Thu Feb 22 00:09:11 2018 |
gautam | Update | ALS | D0902745 in-situ testing | I thought a little bit about the design
of the preamp we want for the demodulated
ALS signals today. The requirements are: |
|
|
13647
|
Wed Feb 21 17:20:32 2018 |
johannes | Update | VAC | Hornet gauge connected to DAQ. | I wired the six available BNC connectors
on the front panel of the new XEND slow DAQ
to physical Acromag channels. There were |
|
|
13646
|
Wed Feb 21 12:17:04 2018 |
gautam | Update | CDS | LO Power mon channels added to c1lsc | To make this setup more permanent, I modified
the c1lsc |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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: |
|
|
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 |
|
|
13639
|
Fri Feb 16 22:15:30 2018 |
gautam | Update | General | c1mcs model restarted | c1mcs
had died for some reason. Looking at dmesg, |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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 |
|
|
13633
|
Wed Feb 14 17:49:22 2018 |
gautam | Update | Electronics | PSL table power supply cleanup | [steve,
gautam] |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
13629
|
Fri Feb 9 15:29:32 2018 |
Kira | Update | PEM | PID test plan | [Kira, Steve]
We installed and labeled the
Sorensens today. |
|
|
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). |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
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 |
|