| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11039
|
Mon Feb 16 15:08:26 2015 |
Jenne | Update | LSC | ALS fool measured decoupling TF | Dang it, yes. You're right. I
should have caught that.
Since Dcpl and Srefl are both zero |
|
|
11041
|
Tue Feb 17 00:24:47 2015 |
rana, jenne | Update | LSC | ALS Fool filter updated for more cancellation | Today
we measured the TFs again and then updated
the filter in the POY -> ALS FF path so |
|
|
11042
|
Tue Feb 17 04:04:32 2015 |
Jenne | Update | LSC | ALS fool math | I re-did the Mathematica notebook according
to the most current diagram (note to daytime
self: attach .nb file!!!), and found that |
|
|
11043
|
Tue Feb 17 16:36:08 2015 |
Jenne | Update | LSC | ALS fool math | Here is an updated cartoon, with the ALS
sensor explicitly shown as the beatbox times
the closed loop response of the phase tracker |
|
|
11044
|
Tue Feb 17 16:44:04 2015 |
Koji | Update | LSC | Delay line installed again | For tonight's experiment, I re-installed
the delay line cable and changed the attenuation
to 10dB for the 55MHz modulation. |
|
|
11045
|
Tue Feb 17 19:49:51 2015 |
Koji | Update | LSC | Delay line un-installed again | The modulation setting was reverted.
Demod phase for REFL11/33/55/165 and
AS55 were reverted to the previous numbers |
|
|
11046
|
Wed Feb 18 01:58:51 2015 |
ericq | Update | LSC | ALS Fool single arm performance | I'm playing around with the lastest
ALS fool feedforward on the Yarm, and I like
what I'm seeing. |
|
|
11047
|
Wed Feb 18 17:51:40 2015 |
ericq | Update | LSC | ALS Fool impulse response | Koji raised a good question about the step
response I wrote about. Namely, if the UGF
of the ALS servo is around 100Hz, we would |
|
|
11048
|
Wed Feb 18 19:06:40 2015 |
Koji | Update | LSC | ALS Fool impulse response | |
|
|
11049
|
Thu Feb 19 04:09:21 2015 |
ericq | Update | Electronics | Second QPD Whitening Switch enabled | X end QPD has recieved 0.2+0.4 absorptive
ND filters. Y end QPD got one at 0.6. This
appears to have mitigated the saturations |
|
|
11050
|
Thu Feb 19 04:16:45 2015 |
Jenne | Update | LSC | ALS fool attempt with PRFPMI | [Jenne, EricQ]
We tried several times tonight
to engage the Fool path with the PRFPMI. |
|
|
11051
|
Thu Feb 19 15:45:43 2015 |
ericq | Update | CDS | Bad CDS behavior | At about 10AM, the C1LSC frontend stopped
reporting any EPICS information. The arms
were locked at the time, and remained so |
|
|
11052
|
Thu Feb 19 23:23:52 2015 |
Chris | Update | CDS | Bad CDS behavior | The frontends have some paths NFS-mounted
from fb. fb is on the ragged edge of being
I/O bound. I'd suggest moving those mounts |
|
|
11053
|
Fri Feb 20 12:08:10 2015 |
ericq | Update | CDS | Bad CDS behavior | I've been able to get all models running.
Most optics are damped, but I'm having
trouble with the ITMs, BS and PRM. |
|
|
11054
|
Fri Feb 20 12:29:01 2015 |
ericq | Update | CDS | All optics damped | I noticed some diagnostic bits in the c1sus
IOP complaining about user application timing
and FIFO under/overflow (The second and fourth |
|
|
11055
|
Fri Feb 20 14:44:47 2015 |
ericq | Update | CDS | Bad CDS behavior | In an effort to ease the IO load on the
framebuilder, I've cleaned up the DQ
channels being written to disk. The biggest |
|
|
11056
|
Fri Feb 20 19:09:48 2015 |
ericq | Update | ASC | QPD frontend code unified | I have changed all of the oplevs and transmon
QPDs to use the common ISC QPD library block,
which differs mainly in its divide by zero |
|
|
11057
|
Mon Feb 23 08:06:59 2015 |
rana | Update | ASC | QPD frontend code unified | Might have to also get the OL screens that
go with this new code to see, but the calibrations
don't go into the matrix, but rather |
|
|
11058
|
Mon Feb 23 15:04:10 2015 |
Zach | Update | General | Elog restarted | The elog crashed while I was creating
an entry to the Cryo log. I restarted it
with the |
|
|
11059
|
Mon Feb 23 21:57:13 2015 |
Koji | Update | LSC | Delay line installed again (experiment, round 1) | Last Wednesday we tried PRMI 3f modulation
cancellation. Under the 3f modulation cancellation,
the PRMI could not be locked |
|
|
11060
|
Tue Feb 24 01:57:01 2015 |
Jenne | Update | LSC | Modelled effect of relative modulation phase | I have used Optickle to model the effect
of changing the phase between the 11MHz and
55MHz EOMs. Also, I have looked at |
|
|
11061
|
Tue Feb 24 18:54:26 2015 |
ericq | Update | ASC | Single arm QPD ASC stability | I've lowered the UGFs for the transmission
QPD servos to ~1-2Hz, and made it just an
integrator. I left the arms locked with the |
|
|
11062
|
Tue Feb 24 23:39:16 2015 |
Jenne | Update | LSC | Delay line re-installed again | About 5-10 minutes ago I just put in the
modulation cancellation setup according to
the recipe in http://nodus.ligo.caltech.edu:8080/40m/11032 |
|
|
11063
|
Wed Feb 25 04:21:58 2015 |
ericq | Update | CDS | Some model updates | I changed the suspension library block
to acquire the SUS_[optic]_LSC_OUT channels
at 16k for sensing matrix investigations. |
|
|
11064
|
Wed Feb 25 04:59:47 2015 |
Jenne | Update | LSC | Delay line re-installed, measurements round 2 | [Jenne, EricQ, Rana]
We spent this evening measuring
and thinking about our 3f signals, and the |
|
|
11065
|
Wed Feb 25 11:01:05 2015 |
manasa | Update | Computer Scripts / Programs | New screen for FOL PID loop | Created a new medm screen C1ALS_FOL_PID.adl for
FOL PID loop control in |
|
|
11066
|
Wed Feb 25 12:16:27 2015 |
Koji | Update | LSC | Delay line re-installed, measurements round 2 | WHAT?
WHAT? WHAT? It's obviously opposite.
If
the reflectivity of the front mirror is fixed |
|
|
11067
|
Wed Feb 25 14:18:28 2015 |
rana | Update | LSC | Delay line re-installed, measurements round 2 | The Schnupp asymmetry is definitely not
an important parameter (no need for Koji
to explode). It only serves to give us a |
|
|
11068
|
Wed Feb 25 14:35:32 2015 |
Steve | Update | safety | safety audit 2015 | Safety audit went soothly. We thank all
participients.
Correction list: |
|
|
11069
|
Wed Feb 25 14:51:13 2015 |
Jenne | Update | LSC | Delay line un-installed again | And now I've removed the delay line,
and am in the process of reverting the demod
phases, etc. |
|
|
11070
|
Wed Feb 25 20:00:39 2015 |
Jenne | Update | LSC | Delay line un-installed again - sensing matrix comparisons | I have measured the sensing matrix for
the PRMI at the REFL photodiodes for both
the nominal configuration and the 33MHz cancellation |
|
|
11071
|
Wed Feb 25 23:48:57 2015 |
rana | Update | LSC | some thoughts |
Comparing just the 2 cases with
locking on 33, it seems that the 55 MHz gain
has changed by 14 dB instead of the 10 dB |
|
|
11072
|
Thu Feb 26 00:20:54 2015 |
ericq | Update | LSC | Modelled effect of relative modulation phase | I'm working on some more modelling
investigations of this whole situation. The
main thing I wanted to do was to look at |
|
|
11073
|
Thu Feb 26 01:51:39 2015 |
ericq | Update | LSC | Sideband HOMs | So, my previous post suggested that 44*11
products might be the dominating signals
in our "nominal" setup. I suppose |
|
|
11074
|
Thu Feb 26 01:53:35 2015 |
Koji | Update | LSC | Modelled effect of relative modulation phase | Ok... This is what I was afraid of, and
it seems true.
i.e. the relation ship of the modulations |
|
|
11075
|
Thu Feb 26 10:56:34 2015 |
manasa | Update | General | Running cables | [Steve, Manasa]
We ran power cables and sma cables
for the FOL fiber module from the PSL table |
|
|
11076
|
Thu Feb 26 13:17:31 2015 |
ericq | Update | Computer Scripts / Programs | FB IO load | Over the past few days, I've occasionally
been peeking at the framebuilder IO
load to see If I could correlate anything |
|
|
11077
|
Thu Feb 26 13:55:59 2015 |
jamie | Update | Computer Scripts / Programs | FB IO load | We should use "ionice" to throttle the rsync.
Use something like "ionice -c 3 rsync ..."
to set the priority such that the rsync process |
|
|
11079
|
Thu Feb 26 16:46:37 2015 |
manasa | Update | General | IOO rack power supply | I shutdown the +/-15V and the +/-24V sorensons
on the IOO rack to connect the FOL RF PDs
to the rack power supply. |
|
|
11080
|
Thu Feb 26 20:02:46 2015 |
Jenne | Update | LSC | re: some thoughts | I have clarified my elog from last night
to indicate that the sensing matrix in the
"33MHz cancellation" configuration |
|
|
11082
|
Fri Feb 27 03:48:29 2015 |
Jenne | Update | LSC | PRMI locked during CARM scan | One of the things that I looked at tonight
was whether or not I could hold the PRMI
on REFL165 at CARM offset of 0, and it turns |
|
|
11083
|
Fri Feb 27 10:25:24 2015 |
steve | Update | Cameras | quad picture problem | MUX input 7 to ITMXF camera cable was replaced
by temporary cable labeled as 888
The problem remains to be the same |
|
|
11084
|
Fri Feb 27 11:20:49 2015 |
ericq | Update | Computer Scripts / Programs | iPython Notebook for LSC Sensing Matrix |
|
|
|
11085
|
Fri Feb 27 14:17:51 2015 |
Steve | Update | safety | safety audit 2015 | Safety glasses were measured and they are
all good. I'd like to measure your personal
glass if it is not on this picture. |
|
|
11086
|
Fri Feb 27 21:16:10 2015 |
Jenne | Update | LSC | PRMI locked during CARM scan | Here are a bunch of PDFs of time series
from last night's CARM sweeps.
The y-axes are all calibrated (except for |
8x |
|
11087
|
Mon Mar 2 17:02:01 2015 |
ericq | Update | LSC | BS - PRM decoupling | Using PRX, I remeasured the relative actuation
strengths of the BS and PRM to see if the
PRM correction coefficient we're using |
|
|
11088
|
Mon Mar 2 18:34:12 2015 |
Jenne | Update | SUS | ETMX moving during single arm lock | This has been edited several times over
the last several hours, as I try to change
different parameters, to see if they affect |
|
|
11090
|
Tue Mar 3 04:41:45 2015 |
Jenne | Update | LSC | Transitioned DARM to AS55Q, some other work | Better elog tomorrow - notes for now:
REFL165 for PRMI has been "a
champ" (quote from Q). We're |
|
|
11092
|
Tue Mar 3 09:42:40 2015 |
Steve | Update | SUS | ETMX is drifting | The temperature of the east and south ends
are normal, they are about the same.
|
|
|
11093
|
Tue Mar 3 11:38:11 2015 |
Steve | Update | safety | professional crane inspection |
|
|