ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
13692
|
Tue Mar 20 19:48:10 2018 |
gautam | Update | PEM | test setup | according to the temp sensor readout, which
was ~-3.35V which corresponds to ~335K, the
temperature of the can is now 60 |
|
13691
|
Tue Mar 20 16:56:01 2018 |
Kira | Update | PEM | test setup | The MOSFET was getting pretty hot, so I
switched it out to a larger heat sink and
it's fine now. I then used a function |
 |
13690
|
Tue Mar 20 16:53:03 2018 |
gautam | Update | IOO | IMC loop checkup | Re-measured the demod board noises after
replacing the suspect ERA-5SMs, with LO driven
by a marconi at the "nominal" level |
|
13689
|
Mon Mar 19 23:44:00 2018 |
gautam | Update | IOO | IMC loop checkup | [koji,
gautam]
I began my investigations |
 |
13688
|
Mon Mar 19 15:02:29 2018 |
gautam | Update | ALS | Noisy MC sensing | The working hypothesis, since the excess
noise in single arm locks is coherent between
both arms, the excess sensing noise is frequency |
|
13687
|
Mon Mar 19 14:39:09 2018 |
johannes | Configuration | Computers | c1auxex replacement | [gautam, johannes]
The temperature control output
channel for the XEND seismometer wasn't |
|
13686
|
Mon Mar 19 07:37:00 2018 |
Angelina Pan | Summary | | Proposed QPD Optical Arrangement | I am currently working on an optical arrangement
consisting of a QPD that measures the fluctuations
of an incoming HeNe laser beam that |
|
13685
|
Fri Mar 16 09:36:56 2018 |
Steve | Update | VAC | RGA scan at day 511,218d | Pumpdown 80 at 511 days and pd80b at 218
days
Valve configuration: special |
 |
13684
|
Thu Mar 15 17:33:56 2018 |
Kira | Update | PEM | test setup | I have attached the setup I completed today.
The metal box contains the heater circuit
and the board for the temperature sensor |
|
13683
|
Thu Mar 15 16:00:25 2018 |
Larry Wallace | Summary | Computers | Cert renewal for NODUS | The cert for nodus has been renewed for
another 2 years.
The following is the basic |
|
13682
|
Wed Mar 14 23:58:30 2018 |
johannes | Configuration | Computers | c1auxex replacement | I replaced the borrowed server with the
permanent one today. Before Removing the
current server, Before, I performed several |
|
13681
|
Tue Mar 13 20:03:16 2018 |
johannes | Configuration | Computers | c1auxex replacement | I assembled the rack-mount server that
will long-term replace c1auxex, so we can
return the borrowed unit to Larry. |
 |
13680
|
Mon Mar 12 23:57:31 2018 |
gautam | Update | ALS | Noisy POX | [kevin,
gautam] |
 |
13679
|
Mon Mar 12 22:08:31 2018 |
gautam | Update | ALS | Noisy POX | [kevin, gautam]
we tested my noisy POX hypothesis
tonight. By locking the single arm with POX, |
|
13678
|
Mon Mar 12 13:58:37 2018 |
gautam | Update | General | projector light bulb blown | Bulb went out ~10am today. Looks like the
lifetime of this bulb was <100 days.
Steve: |
|
13677
|
Fri Mar 9 20:35:41 2018 |
Udit Khandelwal | Summary | General | Summary 2018/03/09 | 1. Optical Table Layout
I had discussed with Koji a way
to record coordinates of optical table equipments |
|
13676
|
Fri Mar 9 12:59:53 2018 |
Kira | Update | PEM | ADC noise measurement | [Kira, Gautam]
I ceated a simple circuit that
takes in 15V and outputs precisely 5V by |
 |
13675
|
Fri Mar 9 01:07:01 2018 |
gautam | Update | ALS | First look at new ALS electronics | [koji,
gautam] |
|
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. |
|