| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
8587
|
Thu May 16 01:41:31 2013 |
Jenne | Summary | IOO | FSS gain settings set |
|
|
|
8598
|
Fri May 17 18:58:58 2013 |
Jamie, Koji | Summary | CDS | Weird DAC bit flipping at half integer output values | While looking at the DAC anti-imaging filters,
Koji noticed an odd feature of the DAC output:
|
|
|
8599
|
Fri May 17 19:56:52 2013 |
Koji | Summary | CDS | Weird DAC bit flipping at half integer output values | Let me make a complimentary comment on
this effect.
Because of this oscillation feature, |
|
|
8612
|
Wed May 22 00:42:13 2013 |
Koji | Summary | SUS | violin Q | While looking at the decay of the violin
mode of the PRM, I made a simple measurement
of the decay rate. |
|
|
8613
|
Wed May 22 11:09:33 2013 |
Jamie | Summary | CDS | Weird DAC bit flipping at half integer output values | After querying CDS folks about this issue,
I got some responses that indicated the problems
was likely limit-cycle oscillations due to |
|
|
8614
|
Wed May 22 11:21:28 2013 |
Koji | Summary | CDS | Weird DAC bit flipping at half integer output values | Is this limit cycle caused by the residual
of the digital AI filtering at the half sampling
freq and that his the threshold? |
|
|
8615
|
Wed May 22 11:35:06 2013 |
Jamie | Summary | CDS | Weird DAC bit flipping at half integer output values |
|
|
|
8616
|
Wed May 22 15:08:37 2013 |
Koji | Summary | CDS | Weird DAC bit flipping at half integer output values | It seems that the effect is from the (linear)
residual fluctuation of the digital AI filter
for the zero-padded signal. |
|
|
8624
|
Thu May 23 01:27:11 2013 |
Manasa | Summary | LSC | Xarm beat note search continues | Towards finding the x-arm beat note:
The green would not lock to a maximum |
|
|
8626
|
Thu May 23 10:24:23 2013 |
Jamie | Summary | CDS | c1scy model continues to run at the hairy edge | c1scy, the controller model at the Y END,
is still running very long, typically at
55/60 microseconds, or ~92% of it's cycle. |
|
|
8629
|
Thu May 23 13:14:34 2013 |
Koji | Summary | LSC | Xarm beat note search continues | We should consider to hook up the temperature
monitors of the NPROs to the ADCs. |
|
|
8631
|
Thu May 23 17:51:39 2013 |
Koji | Summary | LSC | My usual locking procedure | For purpose of the automation and my record,
I summarized my locking procedure as a chart. |
|
|
8686
|
Thu Jun 6 15:46:10 2013 |
Max Horton | Summary | General | Smart UPS 2200 Batteries Replaced | Replaced the batteries successfully in
the control room. We just had to switch
the clips from the old batteries to the new |
|
|
8694
|
Tue Jun 11 22:16:56 2013 |
Manasa | Summary | Green Locking | ALS for X arm | I discussed with Yuta about the ALS servo
and phase tracker and found that there was
a lot of information lying around from last |
|
|
8703
|
Thu Jun 13 22:31:12 2013 |
Manasa | Summary | Green Locking | X arm ALS | Stabilized ALS
and beat frequency sweep realized. |
|
|
8708
|
Fri Jun 14 07:06:19 2013 |
Koji | Summary | Green Locking | X arm ALS | It's nice that we are now able to scan
the cavity again. We got close to PRMI+one
arm one step further. |
|
|
8717
|
Tue Jun 18 10:37:00 2013 |
Steve | Summary | General | new laser pointers | Red-green
laser pointers added to the depleted
stock of 2011 |
|
|
8738
|
Mon Jun 24 16:06:17 2013 |
Manasa | Summary | Green Locking | ALS model | I am working on the basic
ALS servo model. The simulink model for the
same is attached. The loop is not yet complete |
|
|
8752
|
Wed Jun 26 01:30:31 2013 |
rana | Summary | PEM | Variation in 10-30 Hz seismic RMS | For quite a while (no one knows how long),
we've seen fluctuations in the 10-30 Hz seismic
motion. This shows up as the purple trace |
|
|
8776
|
Thu Jun 27 22:52:38 2013 |
Rana, Gabriele, Francesco | Summary | Computer Scripts / Programs | LIGO-DV installed | I installed ligoDV in the /ligo/apps/ligoDV/
Now, by pointing the tool at the
local NDS2 server (megatron:31200) you can |
|
|
8795
|
Wed Jul 3 11:07:17 2013 |
Alex | Summary | | Photodetector Characterization | [Alex, Koji]
We characterized Koji's BBPD
MOD for REFL165 (see attachment). |
|
|
8797
|
Wed Jul 3 14:33:46 2013 |
Koji | Summary | LSC | Test result for the REFL165 photodetector | P.1 Circuit diagram
Added components are indicated by
red symbols. |
|
|
8816
|
Tue Jul 9 23:27:17 2013 |
Koji | Summary | LSC | MICH: ITMX/Y <=> PRM/BS | The MICH actuation with PRM/BS was investigated
again.
(ITMX -1 / ITMY +1) is equivalent |
|
|
8882
|
Fri Jul 19 22:35:06 2013 |
Koji | Summary | LSC | Various Arm signal (Yarm) | The StripTool plot attached below shows
various arm signals measured with the Y arm
cavity swept using ALS. |
|
|
8885
|
Fri Jul 19 23:35:52 2013 |
Koji | Summary | LSC | TRY DC locking | The
Y arm was locked with the TRY DC signal.
The |
|
|
8887
|
Mon Jul 22 03:10:41 2013 |
rana | Summary | lore | Angel of the Y End Table? | Trying to take an image or movie
of the ETMY Transmon cam, we got instead
this attached image. |
|
|
8888
|
Mon Jul 22 06:58:17 2013 |
Lisa | Summary | lore | Angel of the Y End Table? |
|
|
|
8905
|
Tue Jul 23 13:29:58 2013 |
Koji | Summary | General | | record of the initial state |
|
|
8987
|
Thu Aug 8 18:43:12 2013 |
Sujan | Summary | PEM | Optimally subtracting signals from two seismometers. | An exercise of optimally subtracting one
seismometer signal by another using weiner
filters was done. Results have been summarized |
|
|
8988
|
Thu Aug 8 18:47:41 2013 |
Sujan | Summary | PEM | Using weiner filters for subtracting signals MC_L and GUR2_X | I used MC_L signal from the Mode Cleaner
as the desired signal with GUR2_X as witness
signals. I observed good subtraction where |
|
|
9004
|
Tue Aug 13 11:40:19 2013 |
Alex Cole | Summary | Electronics | RFPD Demod Filter Frequency Response Measurement | For the RF PD Frequency Response
Measurement project, we get each PD signal
from the "PD RF Mon" output of |
|
|
9009
|
Tue Aug 13 21:49:32 2013 |
Koji | Summary | General | Testing new AG4395A network analyzer | New AG4395, sn MY41101114 for West
Bridge Labs was delivered. For the test purpose
it is at the 40m now. |
|
|
9010
|
Tue Aug 13 22:21:12 2013 |
Koji | Summary | General | Minicircuit Filter TFs (AG4395A test) | As a part of the network analyzer test
in the previous entry, the transfer functions
of Mini-Circuits filters we have at the 40m |
|
|
9012
|
Thu Aug 15 01:51:50 2013 |
Koji | Summary | General | RFM<->Dolphin bridge distributed to c1rfm and c1mcs | Since the RFM-Dolphin bridges for the ASX
model was added to the c1rfm model, c1rfm
kept timing-out from the single sample time |
|
|
9021
|
Sun Aug 18 16:04:07 2013 |
rana | Summary | CDS | FB lights all RED: mxstream restart | Sun Aug 18 15:52:50 2013
Found the FB lights (C1:FEC-NN_FB_NET_STATUS
and C1:DAQ-DC0_C1XXX_STATUS) RED for everything |
|
|
9022
|
Sun Aug 18 17:56:16 2013 |
rana | Summary | CDS | MEDM Screen CPU Usages | I noticed at LLO (?) that the LSC screen
there uses up ~25-30% of the CPU time on
a single core for the control room iMac workstations |
|
|
9042
|
Tue Aug 20 16:23:41 2013 |
rana | Summary | General | /home/cds nearly full | /home/cds is >98% full - below are some
of the usage numbers:
|
|
|
9044
|
Wed Aug 21 00:18:03 2013 |
Masayuki | Summary | Green Locking | X-arm PDH OLTF measurement | [Manasa Masayuki]
Today we measured the openloop transfer
function of the PDH green lock of the x-arm. |
|
|
9045
|
Wed Aug 21 17:42:03 2013 |
rana | Summary | General | /home/cds nearly full | One of the reasons that our disk is getting
full is due to the scripts_archive directory.
A backup script runs on op340m and makes |
|
|
9047
|
Wed Aug 21 19:37:25 2013 |
Masayuki | Summary | Green Locking | X-arm PDH OLTF measurement | [Manasa, Masyauki]
Today we measured OLTF of PDH green |
|
|
9054
|
Thu Aug 22 20:25:28 2013 |
Masayuki | Summary | Green Locking | Y-arm PDH OLTF measurement | [Manasa, Masayuki]
We measured the the openloop transfer
function of the PDH green lock of the y-arm.The |
|
|
9089
|
Fri Aug 30 01:01:28 2013 |
rana, nic | Summary | Computer Scripts / Programs | aLIGO Noise Budget code installed and running | Chris Wipf has been developing a new Noise
Budget code that allows us to use our existing
Simulink models to handle all of the noise |
|
|
9123
|
Wed Sep 11 23:34:37 2013 |
Masayuki | Summary | Green Locking | ALS locking in both arms | [manasa, masayuki]
We locked the XARM and YARM with
using ALS control loop and |
|
|
9124
|
Wed Sep 11 23:43:10 2013 |
Koji | Summary | Green Locking | ALS locking in both arms | What was the beat freq for each arm?
The HF noise level depends on the
frequency of the beat note. |
|
|
9125
|
Thu Sep 12 00:07:26 2013 |
Masayuki | Summary | Green Locking | ALS locking in both arms |
|
|
|
9147
|
Fri Sep 20 20:14:52 2013 |
rana | Summary | General | /home/cds nearly full |
|
|
|
9156
|
Tue Sep 24 20:43:45 2013 |
masayuki | Summary | SUS | optical levers centering | I centered optical levers of ITMX,BS,ETMY.
I also change the position of optical levers
of ITMX, ETMY, ITMY, BS on Friday night(9/21), |
|
|
9158
|
Wed Sep 25 08:11:01 2013 |
Masayuki | Summary | LSC | LSC calibration screen |
|
|
|
9161
|
Wed Sep 25 23:15:11 2013 |
Masayuki | Summary | Green Locking | FPMI noise caused by ARM locking | I measured some error signal, OLTFs and
responses for FPMI noise estimation. Especially
we are interested in the noise from in-loop |
|
|
9162
|
Wed Sep 25 23:59:29 2013 |
Masayuki | Summary | Green Locking | FPMI noise caused by ARM locking |
Measurement |
|