| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11890
|
Thu Dec 17 14:02:05 2015 |
gautam | Update | CDS | IPC channels for beat frequency control set up | I've set up two IPC channels that take
the output from the digital frequency counters
and send them to the end front-ends (via |
|
|
11891
|
Thu Dec 17 16:44:03 2015 |
gautam | Update | CDS | ALS Slow control MEDM screen updated |
|
|
|
11892
|
Fri Dec 18 17:37:04 2015 |
rana | Update | LSC | Uncooperative AUX X | Here's how we should diagnose the EX
laser:
Compare IR RIN of laser |
|
|
11893
|
Sun Dec 20 23:23:54 2015 |
ericq | Update | ALARM | Rats. | A small rat / large mouse just ran through
the control room. Ugh. |
|
|
11894
|
Mon Dec 21 02:29:49 2015 |
ericq | Update | LSC | AUX X RIN measurements | I'll finish up the beat / frequency
noise parts of the diagnosis tomorrow
later, but I've done some investigation |
|
|
11895
|
Mon Dec 21 14:31:41 2015 |
Steve | Update | PEM | Rat traps set | Two mechanical and two sticdky traps were
set to catch univited visitor.
Absolutely |
|
|
11896
|
Tue Dec 22 16:23:33 2015 |
gautam | Update | IOO | Input alignment to PMC tweaked | When I came in this afternoon, I saw that
the PZT voltage to the PMC had railed. Following
the usual procedure of turning the servo |
|
|
11897
|
Tue Dec 22 16:39:42 2015 |
Steve | Update | endtable upgrade | ETMY optical table enclosure | I think there should be a scientifically
based aveluation of the ETMY enclosure so
we can make the ETMX better. |
|
|
11898
|
Tue Dec 22 16:44:03 2015 |
gautam | Update | General | FS725 Rubidium reference - REPAIRED |
|
|
|
11899
|
Wed Dec 23 03:27:04 2015 |
rana | Update | Computer Scripts / Programs | LHO EPICS slow down | https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=24321
This LHO log indicates that EPICS
slow down could be due to NFS activity. Could |
|
|
11902
|
Sat Dec 26 10:34:43 2015 |
Steve | Update | General | today | PMC locked manually and PRM sus damping
restored. |
|
|
11903
|
Mon Dec 28 14:12:23 2015 |
Steve | Update | SUS | 4.2M EQ | Suspensions are recovered after 4.2 Mag
earth quake. No obvoius sign of damage.
|
|
|
11904
|
Wed Dec 30 11:09:52 2015 |
Steve | Update | SUS | 4.4M EQ | Suspensions recovered after 4.4 Mag EQ
|
|
|
11906
|
Mon Jan 4 16:09:54 2016 |
gautam | Update | Green Locking | Y end laser (Lightwave) PZT calibration | Summary:
I
redid this measurement and have now determined |
|
|
11907
|
Mon Jan 4 16:45:11 2016 |
gautam | Update | Green Locking | Y-end AUX PDH noise breakdown | Summary:
I've
re-measured the noise breakdown for the Y-end |
|
|
11908
|
Tue Jan 5 02:54:38 2016 |
ericq | Update | LSC | AUX X Freq Noise attempt | [ericq, Gautam]
We set out to lock a marconi to
the IR fiber beat of PSL + AUX X to measure |
|
|
11909
|
Tue Jan 5 09:48:52 2016 |
Steve | Update | PEM | Rat trap moved | Our janitor confirmed that Q was not hallucinating
about this animal. The dropping size indicating
a good size one in the IFO room. |
|
|
11910
|
Tue Jan 5 13:17:06 2016 |
rana | Update | LSC | AUX X Freq Noise attempt | The problem here is that the MC displacement
noise is leading to large frequency excursions
of the PSL beam. Options |
|
|
11911
|
Tue Jan 5 15:48:16 2016 |
Steve | Update | safety | Rat trap locations | Please look around when working close to
these five locations. Use flashlights or
leave lights on. |
|
|
11912
|
Tue Jan 5 16:33:45 2016 |
ericq | Update | LSC | AUX X Freq Noise attempt | Turning on the MCL path (in addition to
the MCL FF we always have on) let me lock
the PLL for multiple seconds, but low frequency |
|
|
11913
|
Tue Jan 5 17:19:57 2016 |
rana | Update | safety | Rat trap locations | In the modern times, people use glue traps
to catch rats instead of springs. They are
less hazardous to people and don't spread |
|
|
11914
|
Wed Jan 6 08:09:04 2016 |
Steve | Update | PEM | 4.5 Mag Banning EQ | IFO restored after 4.5 Mag Banning, Ca
earthquake. |
|
|
11915
|
Wed Jan 6 10:58:03 2016 |
Steve | Update | General | projector light bulb is out | Projector light bulb ordered
|
|
|
11916
|
Wed Jan 6 16:40:49 2016 |
ericq | Update | General | New WiFi router | The new wifi router, a Netgear R6400,
has been installed, next to the old one which
is disconnected (but not yet removed). |
|
|
11917
|
Thu Jan 7 04:28:39 2016 |
ericq | Update | LSC | AUX X Freq Noise measured | [ericq, Gautam]
Brief summary of tonights work:
Locked Marconi to AUX X |
|
|
11918
|
Thu Jan 7 15:29:54 2016 |
ericq | Update | WienerFiltering | Noise Subtraction Puzzler | The puzzle continues...
I found some reference for computing
"multicoherence," which should |
|
|
11919
|
Thu Jan 7 16:52:32 2016 |
ericq | Update | LSC | AUX X Freq Noise measured | Here is some of the promised data. As mentioned,
changing diode current and crystal temperature
didn't have much effect on the frequency |
|
|
11920
|
Thu Jan 7 19:04:25 2016 |
Koji | Update | LSC | AUX X Freq Noise measured | The next step is to compare this data with
the same measurement with the PSL and the
AUX laser on the PSL table (or the end Y |
|
|
11921
|
Fri Jan 8 14:47:33 2016 |
ericq | Update | LSC | AUX Y Freq Noise measured | Here are some results from measuring the
PSL / AUX Y beat.
With the Y end laser, I was able |
|
|
11922
|
Fri Jan 8 20:02:49 2016 |
rana | Update | LSC | AUX Y Freq Noise measured | Unless this is the limit from the way you
guys set up the PLL, it seems like there's
no difference between the two lasers that's |
|
|
11923
|
Fri Jan 8 22:37:17 2016 |
Koji | Update | General | New WiFi router | I configured a new wifi bridge for a GPIB
Instruments.
The some facts are described on |
|
|
11924
|
Sat Jan 9 00:39:15 2016 |
gautam | Update | LSC | AUX Y Freq Noise re-measured |
|
|
|
11925
|
Mon Jan 11 19:01:56 2016 |
gautam | Update | LSC | PLL Marconi Investigation | EDIT 01/12/2016 6PM:
I've updated the plots of the in-loop |
6x |
|
11926
|
Tue Jan 12 03:03:55 2016 |
ericq | Update | LSC | Frequently making noise | Gautam will soon follow up with detailed
analysis, but here is a brief summary of
some of our activities and findings. |
|
|
11927
|
Tue Jan 12 07:54:23 2016 |
Steve | Update | SUS | ETMX damping restored | PMC locked and ETMX suspension damping
restored. |
|
|
11928
|
Tue Jan 12 08:40:06 2016 |
Steve | Update | PEM | Air cond maintenance | Air condition maintenance is happening.
It should be done by 10am |
|
|
11929
|
Tue Jan 12 19:38:31 2016 |
gautam | Update | LSC | Frequently making noise | EDITS
15Jan:
Schematic |
|
|
11930
|
Wed Jan 13 18:36:00 2016 |
gautam | Update | LSC | restoration of green beat electronics | In preparation for tonight's work,
I did the following:
On the PSL table: |
|
|
11931
|
Thu Jan 14 02:33:37 2016 |
ericq | Update | LSC | ALSX Noise still anomalously high | [ericq, Gautam]
We checked the UGF of the AUX X
PDH servo, found a ~6kHz UGF with ~45 degree |
|
|
11932
|
Thu Jan 14 13:44:05 2016 |
Steve | Update | SUS | earthquake 3.6M | No obvious sign of damage.
|
|
|
11933
|
Thu Jan 14 15:08:37 2016 |
ericq | Update | WienerFiltering | Noise Subtraction Puzzler | The anticlimatic resolution to my subtraction
confusion: Spectral leakage around 1Hz. Increasing the
FFT length to 256 sec now shows that the |
|
|
11934
|
Thu Jan 14 18:41:36 2016 |
rana | Update | WienerFiltering | Noise Subtraction Puzzler | Just not just pedagogical ! Freq
domain MISO coherence based subtraction estimation
is much faster than calculating MISO WF. |
|
|
11935
|
Tue Jan 19 10:25:53 2016 |
Steve | Update | SUS | EQ 3.6M Ludlow | Just an other local earthquake 3.6 Mag
Ludlow, Ca
No obvious sign of damage |
|
|
11936
|
Tue Jan 19 17:27:58 2016 |
gautam | Update | Green Locking | AUX X power investigations | Last week, Eric and I noticed that the
green transmission levels at the PSL table
seem much lower now than they did a month |
|
|
11937
|
Tue Jan 19 17:54:39 2016 |
gautam | Update | LSC | ALSX Noise still anomalously high | While carrying out my end-table power investigations,
I decided to take a quick look at the out-of-loop
ALSX noise - see the attached plot. The feature |
|
|
11938
|
Wed Jan 20 02:53:18 2016 |
ericq | Update | LSC | Hopeful signs | [ericq, Gautam]
We gave DRFPMI locking a shot,
with the ALS out-of-loop noises as attached. |
|
|
11939
|
Wed Jan 20 09:36:11 2016 |
Steve | Update | SUS | ETMX damping restored | ETMX suspension damping restored.
|
|
|
11940
|
Wed Jan 20 23:26:10 2016 |
gautam, rana | Update | LSC | PSL and AUX-X temperatures changed | Earlier today,
we did a bunch of stuff to see if we could
improve the situation with the excess ALS-X |
|
|
11941
|
Thu Jan 21 00:02:11 2016 |
Koji | Update | LSC | Hopeful signs | That's a good news. Only quantitative
analysis will tell us if it is true or not.
Also we still want to analyze the |
|
|
11942
|
Thu Jan 21 18:34:04 2016 |
rana | Update | LSC | PSL and AUX-X temperatures changed | Is the black ref spectrum from this year
or from May of 2015 or ?
I wonder if the noise is a bunch |
|