ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
11572
|
Fri Sep 4 04:12:05 2015 |
ericq | Update | Computer Scripts / Programs | MATLAB down on all workstations | There seems to be something funny going
on with MATLAB's license authentication
on the control room workstations. Earlier |
|
11573
|
Fri Sep 4 08:00:49 2015 |
Ignacio | Update | CDS | RC low pass circuit (1s stage) of Pentek board | Here is the
transfer function and cutoff frequency (pole)
of the first stage low pass circuit of the |
 |
11574
|
Fri Sep 4 09:23:32 2015 |
Ignacio | Update | CDS | Modified Pentek schematic | Attached is the modifed Pentek whitening
board schematic. It includes the yet to be
installed 1nF capacitors and comments. |
|
11575
|
Fri Sep 4 09:36:48 2015 |
Steve | Update | LSC | IR beatnote confusion..... |
|
|
11577
|
Fri Sep 4 15:20:31 2015 |
ericq | Update | LSC | Vertex Sensing | I've now made a collection of sensing
matrix measurements.
In all of the plots below, the |
   |
11578
|
Fri Sep 4 20:06:23 2015 |
rana | Update | LSC | DRMI locked on 1F and 3F | Nice going. I think the LLO / LHO scheme
is to acquire on 1F and then cdsutils avg
to get the 3F offsets. The thinking is that |
|
11579
|
Fri Sep 4 20:42:14 2015 |
gautam, rana | Update | CDS | Checkout of the Wenzel dividers | Some years ago I bought some dividers from
Wenzel. For each arm, we have x256 and a
x64 divider. Wired in series, that means |
  |
11582
|
Mon Sep 7 19:46:46 2015 |
rana | Update | PEM | Seismic BLRMS filters | As it turned out, the "STS" BLRMS
filters were all a mess, so I fixed them
up today: |
|
11583
|
Tue Sep 8 20:30:44 2015 |
rana | Update | IOO | MC WFS relief re-commissioned | I converted our MC WFS relief from CSH
to BASH today. I also added 'wait'
commands and 'echo' commands so that |
|
11584
|
Wed Sep 9 11:00:49 2015 |
Ignacio | Update | IOO | Last Wiener MCL subtractions | On Thursday
night (sorry for the late elog) I decided
to give the MCL FF one more try. |
11x |
11585
|
Wed Sep 9 11:33:58 2015 |
rana | Update | Summary Pages | Summary Page updates |
Made most plots in IOO tab only
plot when MC_TRANS > 10000 using Eve's
MC_LOCK state definition.
added |
|
11587
|
Wed Sep 9 15:45:11 2015 |
ericq | Update | PEM | Inverted STS filters in C1OAF | Our online subtraction filters for PRC
angle and MC length were trained on
the raw ADC signals, so I've inverted |
|
11588
|
Thu Sep 10 01:09:20 2015 |
rana | Update | LSC | Moved LSC sensing matrix notch frequencies | We looked at the DRMI noise spectrum and
chose new excitation frequencies such that
the lines are lower in frequency than before |
|
11589
|
Thu Sep 10 04:23:00 2015 |
ericq | Update | LSC | Moved LSC sensing matrix notch frequencies | Frequencies are:
CARM:
309.21 Hz
DARM: 307.88 Hz
MICH: |
 |
11591
|
Fri Sep 11 10:56:47 2015 |
Steve | Update | endtable upgrade | ETMY optical table feedthrough | The ETMY enclosure feedthrough - north
is installed. The sealing material is hard
to work with. |
|
11592
|
Sun Sep 13 13:26:00 2015 |
rana | Update | IOO | Last Wiener MCL subtractions | When making the Wiener filter OFF/ON comparisons,
we want to use the median PSD estimates,
not the mean (which is what pwelch gives |
|
11593
|
Mon Sep 14 10:41:03 2015 |
Steve | Update | VAC | TP2 dry pump replaced | TP2 dry fore pump sn PLE10082 was replaced
at pressure 717 mTorr, TP2 50K rpm
0.33A @ 112,677 hrs |
|
11594
|
Mon Sep 14 16:50:12 2015 |
ericq | Update | LSC | Quick note | Just a heads up while I'm out for a
bit: the delay line is currently installed
in the 55MHz modulation path. |
|
11595
|
Mon Sep 14 21:42:00 2015 |
rana | Update | IOO | MC Wiener + Summary | I turned on the MCF FF in the OAF today
(we need to fix the labeling of the 'ON'
buttons on the RHS of the screen). The performance |
|
11596
|
Mon Sep 14 23:12:49 2015 |
ericq | Update | LSC | 55MHz modulation phase effect on PRMI | With the adjustable delay line box installed
in the 55MHz modulation path, I've
measured the PRMI sensing matrix as a function |
   |
11600
|
Tue Sep 15 16:49:08 2015 |
Steve | Update | endtable upgrade | ETMY optical table feedthrough | ETMY optical table enclosure feedthrough-
south is in. Now it is time to see how air
tightness increases performance. |
|
11605
|
Wed Sep 16 03:44:18 2015 |
Koji | Update | LSC | RF micky mouse | 1. POP110 RF amps are powered from the
cross connect. But that +15V block has GND
connections that are not connected to the |
 |
11607
|
Wed Sep 16 23:07:06 2015 |
rana | Update | Electronics | LSC Whitening board: LP filters added, pictures taken | I added the 0.1 uF and 47 nF caps
that I mentioned so that we can now bypass
the AA filters for these channels. (mistakenly |
 |
11608
|
Thu Sep 17 02:22:53 2015 |
Steve | Update | endtable upgrade | ETMY optical table feedthrough | I doubt we'll see any effect until
we carefully seal the holes. If there's
1 hole in your boat it still sinks. |
|
11610
|
Thu Sep 17 08:36:14 2015 |
Steve | Update | PEM | earth quake | No damage. The BS sensor UR 0.220 V has
been low for some times.
Dataviewer does not work for long |
  |
11612
|
Thu Sep 17 16:04:09 2015 |
Steve | Update | PEM | Gurs | ETMY - Guralp (B-MIT) was covered with
copper lined can yesterday afternoon. It's
long cable is connected to ADC interface |
|
11613
|
Thu Sep 17 17:27:01 2015 |
gautam | Update | LSC | RF micky mouse - dodgy DIN connector blocks fixed | [Steve, gautam]
We fixed the problematic DIN connectors
on 1Y2, by swapping out the 3 DIN connector |
|
11614
|
Thu Sep 17 19:42:43 2015 |
Koji | Update | LSC | RF micky mouse - dodgy DIN connector blocks fixed | 1.
The delay-line box is now hooked up to the
cross connect +15V supply. |
 |
11616
|
Fri Sep 18 08:03:53 2015 |
rana | Update | LSC | RF micky mouse - dodgy DIN connector blocks fixed | Steve and I turned on the box this morning
so that the IMC would lock again.
For future reference, remember |
|
11617
|
Fri Sep 18 08:04:09 2015 |
rana | Update | LSC | RF micky mouse - dodgy DIN connector blocks fixed | Steve and I turned on the box this morning
so that the IMC would lock again.
For future reference, remember |
|
11619
|
Fri Sep 18 11:59:08 2015 |
ericq | Update | LSC | AUX X Laser Current Reverted | Once again, the transmitted X green beam
was showing enormous intensity fluctuations
(50x higher than normal). Last month, I reduced the |
|
11620
|
Fri Sep 18 13:33:17 2015 |
ericq | Update | LSC | Fast ALS troubles - Noise at 36kHz | To get around the problems between the
pomona LPF and low CM board input impedance,
I've placed the LPF at the CM board fast |
|
11621
|
Fri Sep 18 16:08:41 2015 |
ericq | Update | LSC | Fast ALS troubles - Noise at 36kHz | I looked at REFL11 and REFL55 during
PRMI lock - the line is there.
|
 |
11622
|
Fri Sep 18 19:15:35 2015 |
rana | Update | LSC | Fast ALS troubles - Noise at 36kHz | One the Wiki (https://wiki-40m.ligo.caltech.edu/40mHomePage),
we have a Mech Resonance page for mechanical
frequencies and a PEM page where we want |
|
11624
|
Mon Sep 21 00:51:36 2015 |
rana | Update | General | op340m, autoburt cron =? megatron | I modified the perl script which does our
hourly autoburt so that it can run on megatron
instead of op340m (old Solaris machine). |
|
11625
|
Mon Sep 21 11:12:14 2015 |
Steve | Update | VAC | cold cathode is flaky | CC4 cold cathode gauge jump triggered interlock
to close VM1 valve to protect the RGA.
The IFO pressure is 1e-5 Torr |
|
11626
|
Mon Sep 21 11:40:30 2015 |
ericq | Update | General | Megatron maitenence | The MC autolocker and FSSslow scripts weren't
running on Megtron. These were started by
running the following commands on megatron: |
|
11627
|
Mon Sep 21 15:22:19 2015 |
jamie | Update | DAQ | working on new fb replacement | I've been putting together a new machine
that Rolf got for us as a replacement for
fb. |
|
11632
|
Tue Sep 22 03:48:18 2015 |
ericq | Update | LSC | DRMI tweaked, briefly held with ALS arms | Given the RF component power supply grounding,
POP110, POP22 and REFL165 all changed somewhat.
They have all been rephased for the DRMI, |
|
11633
|
Tue Sep 22 08:58:38 2015 |
Steve | Update | VAC | cold cathode is flaky | The cold cathode gauge is back to normal.
cc4 is the last gauge is "functioning"
MKS is not responding. The spare |
|
11634
|
Tue Sep 22 16:42:39 2015 |
ericq | Update | IOO | Housekeeping | I've moved the OAF MC2 signal path
to go directly from c1oaf to c1mcs, so that
the LSC being ON/OFF doesn't interfere |
|
11636
|
Tue Sep 22 17:30:55 2015 |
jamie | Update | DAQ | attempts at getting new fb working | Today I've been trying to get the new
frame builder, tentatively 'fb1',
to work. It's not fully |
|
11637
|
Wed Sep 23 03:08:50 2015 |
ericq | Update | LSC | DRMI + ALS Arms | [ericq, Gautam]
We can reliably |
|
11638
|
Wed Sep 23 10:31:49 2015 |
ericq | Update | LSC | DRMI + ALS Arms | Looking good. How many meters of CARM is
'-1 counts'? |
|
11639
|
Wed Sep 23 12:51:03 2015 |
Jenne | Update | LSC | DRMI + ALS Arms | Nice!! |
|
11640
|
Thu Sep 24 17:01:37 2015 |
ericq | Update | Computer Scripts / Programs | Freeing up some space on /cvs/cds | I noticed that Chiara's backup HD (which
has a capacity of 1.8TB, vs the main drives
2TB) was near to getting full, meaning that |
|
11641
|
Thu Sep 24 17:06:14 2015 |
ericq | Update | Calibration-Repair | C1CAL Lockins | Just a quick note for now: I've repopulated
C1CAL with a limited set of lockin oscillators/demodulators,
informed by the aLIGO common LSC model. Screens |
|
11642
|
Fri Sep 25 11:08:33 2015 |
Steve | Update | SUS | wire standoffs | Our last effort to change the existing
Al-6061 wire standoffs was at April 2012
We requested sapphire and/or ruby |
|
11643
|
Fri Sep 25 14:52:08 2015 |
Steve | Update | SUS | ETMX is not drifting | We have talked about the drift of ETMX
sus on the Wednesday meeting.
It has stopped moving on Jan 8, |
 |
11644
|
Fri Sep 25 17:00:38 2015 |
Steve | Update | VAC | cold cathode is flaky | The IFO pressure is estimated ~1E-6 Torr
with modified Vac normal valve configuration.
CC4 is in a jumping mode between |
|