| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
4484
|
Mon Apr 4 11:52:13 2011 |
Jenne | Update | PEM | STS2s unpacked | I unpacked the STS2 seismometers that we
borrowed from LLO. They are sitting
underneath the Xarm, in the middle of the |
|
|
4491
|
Wed Apr 6 02:41:01 2011 |
kiwamu | Update | Green Locking | noise budget : some more noise | It turned out that the dark noise from
the beat PD and the shot noise on the beat
PD was overestimated. |
|
|
4492
|
Wed Apr 6 16:02:07 2011 |
Larisa Thorne | Update | Electronics | Cable laying...continued | [Steve, Kiwamu, Larisa]
Having finished laying new cable |
|
|
4496
|
Thu Apr 7 11:38:56 2011 |
steve | Update | PSL | enclosure windows on the east side of the PSL | The PSL enclosure now have 4 windows on
each side. The bottom rail guides on the
east side will be replaced by one |
|
|
4499
|
Thu Apr 7 13:14:23 2011 |
josephb | Update | CDS | Proposed plan for ITMX/ITMY control switch | Problem:
The controls (fast
and slow both) think ITMX is ITMY and ITMY |
|
|
4503
|
Fri Apr 8 01:05:45 2011 |
Suresh | Update | RF System | RF Source Harmonics |
The measured power levels of
the RF source harmonics are given below: |
|
|
4506
|
Sun Apr 10 19:14:08 2011 |
Koji | Update | Green Locking | New Green PD test1 | I started to modify another green PD set.
It so far has the transimpedance
of 240 Ohm on CLC409 for the RF output. |
|
|
4507
|
Mon Apr 11 09:49:53 2011 |
rana | Update | Electronics | New Green PD test1 | Ooh. Can you explain the purpose
of the resistors which are connected to the
(+) inputs? It looks like some real electronics |
|
|
4508
|
Mon Apr 11 11:34:05 2011 |
Koji | Update | Electronics | New Green PD test1 |
|
|
|
4509
|
Mon Apr 11 13:30:04 2011 |
josephb, Jamie | Update | CDS | No Wiper script - Frames full over weekend | Problem:
The daqd
process was dying every minute or so when
it couldn't write frame. This was slowing |
|
|
4510
|
Mon Apr 11 14:17:22 2011 |
josephb, jamie | Update | CDS | Frame wiper script installed | [Joe, Jamie, Alex]
Fixes:
I
asked Alex which cron to use (dcron? frcron?). |
|
|
4511
|
Mon Apr 11 19:09:59 2011 |
Suresh | Update | RF System | Installed low pass filters in the demod boards |
As part of the RF system upgrade
some of the demod boards in the lab were |
|
|
4512
|
Mon Apr 11 20:03:05 2011 |
tara | Update | Electronics | TTFSS for 40m | I brought TTFSS set #7 to 40m and kept
it in the electronic cabinet.
note that Q4 transistor has not been |
|
|
4513
|
Mon Apr 11 21:13:15 2011 |
Koji | Update | Electronics | New Green PD test1 | Correction:
The (-) input has been decoupled
by the capacitor. So the series resistance |
|
|
4514
|
Mon Apr 11 23:35:02 2011 |
rana | Update | RF System | Installed low pass filters in the demod boards | I am a little concerned about using these
low pass filters so close to the band edge.
Recall that there is no on-board preamp for |
|
|
4515
|
Tue Apr 12 12:01:30 2011 |
josephb | Update | General | IFO controls, now with 10% less lying (ITMX/ITMY controls swapped) | The ITMX/ITMY control swap is complete.
The
steps from this
elog were followed. |
|
|
4516
|
Tue Apr 12 16:01:33 2011 |
josephb | Update | General | RFM errors | Problem:
Currently the c1scy,
c1mcs, and c1rfm models are reporting an
error with receiving some data sent over |
|
|
4518
|
Wed Apr 13 11:34:07 2011 |
josephb | Update | CDS | Fixed IFO_ALIGN.adl | Problem:
I switched the
ITMX and ITMY control channels yesterday, |
|
|
4519
|
Wed Apr 13 16:38:17 2011 |
Larisa Thorne | Update | Electronics | Video MUX camera/monitor check | [Kiwamu, Larisa]
The following Video MUX inputs(cameras) |
|
|
4522
|
Thu Apr 14 00:21:28 2011 |
Koji | Update | CDS | New C1LSC code running | [Jamie, Jenne, Koji]
We installed the new c1lsc and started
the process. |
|
|
4523
|
Thu Apr 14 01:03:43 2011 |
Koji | Update | LSC | LSC Campaign ~ Status | Target:
To lock the Michelson with the new RF/LSC
Status |
|
|
4524
|
Thu Apr 14 12:57:15 2011 |
josephb | Update | CDS | RFM network happy again | [Joe, Alex]
Problem Symptoms:
There
were red lights on the status screen indicating |
|
|
4526
|
Thu Apr 14 19:05:17 2011 |
Koji | Update | LSC | New (temporary) LSC screen | [Jenne Koji]
The PD signals are transmitted to
the suspension now. |
|
|
4527
|
Fri Apr 15 02:17:18 2011 |
kiwamu | Update | LSC | Michelson locked | [Koji / Kiwamu]
The |
|
|
4528
|
Fri Apr 15 02:18:50 2011 |
Koji | Update | LSC | Bunch of RF cables removed | While Kiwamu was working on the RF cabling
at the LSC rack, I removed 80% of SMA cables
which were not connected anywhere. |
|
|
4530
|
Fri Apr 15 12:17:39 2011 |
kiwamu | Update | LSC | 11MHz demod board : funny I-Q phase | During checking
the 11MHz demod boards I found that the I-Q |
|
|
4531
|
Fri Apr 15 13:40:00 2011 |
Larisa Thorne | Update | Electronics | Low pass filter for X arm laser temperature control, second try | Plotting the data points yielded by the
spec analyzer of my first LPF yielded a result
that was not expected: the desired cutoff |
|
|
4533
|
Fri Apr 15 15:15:08 2011 |
kiwamu | Update | LSC | 11MHz demod board : 90 degree splitter | [Rana, Koji, Kiwamu]
Moreover
the amplitude of the I and Q signals are |
|
|
4534
|
Fri Apr 15 22:54:20 2011 |
Aidan, Bryan | Update | Green Locking | Beat note amplitude on Vertex PD | I was investigating the beat note amplitude
on the vertex PD again yesterday. The incident
power on the PD was 150uW in the PSL green |
|
|
4537
|
Sat Apr 16 02:00:14 2011 |
rana | Update | LSC | 11MHz demod board : 90 degree splitter | One way to avoid some of the bad stuff
in there is to take the 1 dBm input and amplify
it to ~21 dBm before splitting and sending |
|
|
4539
|
Mon Apr 18 14:11:44 2011 |
kiwamu | Update | LSC | RF status | We
will make them all green !!
|
|
|
4543
|
Tue Apr 19 15:48:43 2011 |
josephb | Update | CDS | MEDM screens and Front Ends updated to new Matrices | Problem:
The original matrix
naming conventions for the front ends was |
|
|
4544
|
Tue Apr 19 17:34:02 2011 |
Koji | Update | CDS | MEDM screens and Front Ends updated to new Matrices | Just a curiosity:
I just wonder how you have distingushed
the difference between _1 |
|
|
4545
|
Wed Apr 20 11:02:18 2011 |
josephb | Update | CDS | MEDM screens and Front Ends updated to new Matrices | We simply didn't any matrices larger than
16x16. If we had, than that matrix would
not have worked properly since the beginning.
|
|
|
4546
|
Wed Apr 20 20:42:55 2011 |
kiwamu | Update | VIDEO | today's video session | [Steve / Suresh / Kiwamu]
90
% of unused video cables have been removed. |
|
|
4548
|
Wed Apr 20 22:29:07 2011 |
suresh | Update | RF System | Plan for LSC rack | The suggested layout of the 1Y2 Rack is
shown below.
To simplify the wiring, I have largely |
|
|
4550
|
Thu Apr 21 08:26:42 2011 |
steve | Update | PEM | PSL enclosure work today | The east side window guides will
be replaced by one long U-channel. There
will be drilling into 2x2 steel frame. It |
|
|
4551
|
Thu Apr 21 14:39:43 2011 |
steve | Update | RF System | new strain relieved N connectors at AP | New right angle PVC, 2 x 2 x 1/4"
installed at the AP table to strain relief
the 1/4" spiral corrugated RF coaxes. |
|
|
4552
|
Thu Apr 21 15:03:29 2011 |
steve | Update | Computers | juction board finds home | The anti aliasing box was opened up at
the back to accommodate the junction board
and the SCSI cable towards the ADC. Aluminum |
|
|
4553
|
Thu Apr 21 15:20:46 2011 |
steve | Update | PEM | PSL enclosure work today |
|
|
|
4554
|
Thu Apr 21 21:24:41 2011 |
kiwamu | Update | LSC | demod board : new 90 deg splitter | A
new 90 degree splitter, PSCQ-2-51W, has arrived
today and I installed it on a demod board |
|
|
4555
|
Thu Apr 21 21:46:22 2011 |
kiwamu | Update | LSC | demod board : new 90 deg splitter | A less
LO power dependence on the relative phase |
|
|
4556
|
Fri Apr 22 02:10:53 2011 |
Zach | Update | elog | restarted | Restarted the elog with the script. |
|
|
4557
|
Fri Apr 22 09:05:53 2011 |
Suresh | Update | RF System | RF Source Harmonics |
As seen in the previous measurement the first
harmonic of both the 11 MHz and 55 MHz outputs |
|
|
4558
|
Fri Apr 22 09:25:43 2011 |
Suresh | Update | RF System | RF Source: Temperature sensor relocated | RF Amp operating temperature
Earlier measurement reported by Alberto
in LIGO-T10004-61-v1 based on the LM34 temperature |
|
|
4559
|
Fri Apr 22 10:28:22 2011 |
rana | Update | RF System | RF Source Harmonics | You should be able to resolve the other harmonics
by [B][COLOR=blue]decreasing the IF BW or
RBW[/COLOR][/B] on the analyzer. Even though
|
|
|
4560
|
Fri Apr 22 11:08:50 2011 |
kiwamu | Update | LSC | demod board AS11 : amplitude imbalance | Amplitude
imbalance between I and Q in a demod board, |
|
|
4561
|
Fri Apr 22 12:07:38 2011 |
josephb, steve | Update | CDS | Removed hanging D-sub to SCSI in 1X2 | Problem:
Way back, Jay had D-sub
to SCSI adapters made to adapt our existing
Sander box AA filters to the new SCSI based |
|
|
4562
|
Sun Apr 24 21:37:40 2011 |
kiwamu | Update | IOO | review of triple resonant EOM : model looks fine | To design a new resonant EOM box I started
reviewing the prototype that I've built.
As a part of reviewing I checked |
|
|
4567
|
Mon Apr 25 22:38:49 2011 |
kiwamu | Update | LSC | prepration for DRMI : Y arm flashing | This
week is going to be a recycled Michelson |
|