ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
7779
|
Tue Dec 4 01:43:37 2012 |
rana | Update | PSL | PMC calibration for MC_F calibration | If you can't find the PMC sidebands
in the transmission, its because the SNR
is too small. |
|
7791
|
Wed Dec 5 09:42:46 2012 |
rana | Omnistructure | Computers | new (beta) version of NDS2 installed on control room machines | NDS2 is not designed for non DQ channels
- it gets data from the frames, not through
NDS1. |
|
7792
|
Wed Dec 5 09:53:01 2012 |
rana | Update | WienerFiltering | The microphones and the speaker on the AP table | Don't
try to re-invent the mic mount: just copy
the LIGO mic mount for the first version. |
|
7796
|
Fri Dec 7 00:08:39 2012 |
rana | Update | Alignment | c1ass |
This looks like a good performance
tuning for these. It would be good if you |
|
7802
|
Sun Dec 9 17:51:53 2012 |
rana | Update | LSC | beam inside DRMI is clipping on PR3 Tip-Tilt |
Some explanation of how you
define power buildup please. Also some plots |
|
7819
|
Thu Dec 13 01:49:53 2012 |
rana | Update | PEM | seismometers |
|
|
7832
|
Fri Dec 14 09:31:59 2012 |
rana | Update | LSC | High frequency noise in AS signal | This is NOT calibrated. Its sort of calibrated
in the 500-1000 Hz area, but does not correctly
use the loop TF or the cavity pole. |
|
7841
|
Mon Dec 17 19:47:15 2012 |
rana | Update | PEM | Seismic StripTool config updated | I have updated the Seismic Striptool display
which is plotted on the wall in the control
room. Please take a look and make comments. |
|
7844
|
Mon Dec 17 21:41:30 2012 |
rana | Summary | SUS | BeCu wire | Just in case we want to retrofit |
|
7859
|
Wed Dec 19 20:18:51 2012 |
rana | Update | Computers | We are Changing the Passwerdz next week---- | Be Prepared
http://xkcd.com/936/ |
|
7866
|
Thu Dec 20 19:46:20 2012 |
rana | Configuration | Environment | Control Room Projector | Needs
|
|
7873
|
Thu Jan 3 19:19:59 2013 |
rana | HowTo | Electronics | cable racks | Today I found 3 power cables in the
orange Pomona cable tray, put in
so that the cables were |
|
7875
|
Fri Jan 4 13:23:10 2013 |
rana | Update | Electronics | Photodiode transimpedance | You have to correct this transimpedance
ratio by correcting for the different levels
of DC photocurrent in the two devices. |
|
7879
|
Mon Jan 7 19:23:19 2013 |
rana | Update | Electronics | Jamie's 1811 PS from 1998 | |
 |
7900
|
Tue Jan 15 01:41:40 2013 |
rana | Update | SUS | TT | That seems like easily enough range;
as long as we can put the TT into the middle
of their range to start with we should be |
|
7909
|
Wed Jan 16 20:27:16 2013 |
rana | Update | Locking | Expected PRC gains | Why would we use such a bad optic in our
recycling cavity? Is 1.5% the spec for these
mirrors? Is this the requirement that Kiwamu |
|
7921
|
Sat Jan 19 16:02:28 2013 |
rana | Omnistructure | Electronics | PS cleanup | During our 'Women in Physics' tours today,
we were reminded that there are several bench
power supplies being used as permanent inside. |
|
7922
|
Sat Jan 19 18:23:31 2013 |
rana | Update | Computers | All front ends but c1lsc are down | After sshing into several machines and
doing 'sudo shutdown -r now', some of them
came back and ran their processes. |
|
7943
|
Thu Jan 24 16:34:56 2013 |
rana | Update | General | Laseroptik mirror - SN6 | I have two questions:
1) Are we sure that the T measurement
is not being compromised by some systematic? |
|
7979
|
Thu Jan 31 22:14:11 2013 |
rana | Summary | ASC | Optics lit | Gouy not Guoy:
http://www.rp-photonics.com/gouy_phase_shift.html
pronounced Goo-eee, with the emphasis |
|
7988
|
Fri Feb 1 23:52:59 2013 |
rana | Update | Locking | PRM/PR2 cavity | Very exciting result, if true. I
suppose we should try to reconfirm this result
by doing another phase map of PRM03. |
|
8015
|
Wed Feb 6 19:59:35 2013 |
rana | Update | Locking | PRC cavity gains | Getting closer, but need to
use the real measured AR reflectivity values,
not the 1500 ppm guess. These should be measured |
|
8029
|
Fri Feb 8 00:23:33 2013 |
rana | Summary | General | PRC/arm mode matching calculations |
I would guess that either flipping
PR2 or PR3 would give nearly the same effect |
|
8051
|
Sat Feb 9 19:34:34 2013 |
rana | Update | Optics | G&H - AR Reflectivity |
Use the trick I suggested:
Focus the beam so that the beam size |
|
8096
|
Sun Feb 17 19:27:19 2013 |
rana | Update | SUS | PRM coil balanced | I will check out the AS55 situation
tomorrow. Just put it on my desk.
MC Autolocker was disabled |
|
8120
|
Wed Feb 20 19:58:59 2013 |
rana | Update | Alignment | BS table oplev re-arranged | Please confirm the SRM OL beam is not too
bad and also find where the mis-aligned SRM
puts its beam. WE want to be sure that there |
|
8123
|
Wed Feb 20 21:12:37 2013 |
rana | Update | Alignment | clipping centering checklist |
Is the beam going towards the
OMC going to cause backscatter because of |
|
8132
|
Thu Feb 21 18:10:13 2013 |
rana | Update | SEI | Pump Down misalignments | This plot shows the trend of the OL during
the past several hours of roughing pumping.
The big steps at the start of the |
|
8147
|
Sat Feb 23 15:46:16 2013 |
rana | Update | Computers | crontab in op340m updated | According to Google, you can add
a line in the crontab to backup the crontab
by having the cronback.py script be in the |
|
8153
|
Sun Feb 24 16:49:00 2013 |
rana | Summary | Electronics | Replacement for the AD743: OPA140 and OPA827 | This looks pretty good already.
Not sure if we can even measure anything
reasonable below 0.1 Hz without a lot of |
|
8154
|
Sun Feb 24 17:54:34 2013 |
rana | Update | SUS | SUS Summary |
I asked John Z to talk with
Jamie and then install a new NDS2 server |
|
8158
|
Mon Feb 25 17:58:28 2013 |
rana | Update | Alignment | Y arm locked, both colors |
That's good news. I was ready
to give up and say we should vent and remove |
|
8191
|
Wed Feb 27 20:10:43 2013 |
rana | Update | Locking | DRFPMI flashes |
If its true that there have
been large flashes, then there indeed might |
|
8195
|
Wed Feb 27 23:19:54 2013 |
rana | Update | Summary Pages | Multiprocessing Implementation | At first I thought that this
was goofy, but then I logged in and saw that
Megatron only has 8GB of RAM. I guess that |
|
8210
|
Sat Mar 2 00:09:31 2013 |
rana | Update | LSC | Xarm oscillation stopped | Don't use resonant gain - it
can lead to a loop instability since it makes
the loop have 3 UGFs. |
|
8211
|
Sat Mar 2 00:23:19 2013 |
rana | Summary | COC | Phase Maps measured of the ATF flat mirrors | I took the two 'flat' 2" mirrors over
to Downs and Garilynn showed me how to measure
them with the old Wyko machine. |
|
8213
|
Sat Mar 2 14:52:02 2013 |
rana | Update | LSC | stable lock of PRMI | Whereas
the sensing matrix coefficients for ITMX/ITMY |
|
8217
|
Mon Mar 4 09:55:33 2013 |
rana | Update | LSC | LSC whitening triggering started | How about posting a logic flow
diagram? Is the idea to trigger only on the
power signals to determine the lock state? |
|
8326
|
Thu Mar 21 12:33:51 2013 |
rana | Update | Computers | Fixed | Please stop power cycling computers. This
is not an acceptable operation (as Jamie
already wrote before). When you don't know |
|
8337
|
Mon Mar 25 15:24:41 2013 |
rana | Update | Locking | TT1 drift |
I doubt that it has truly disappeared.
Can you please make a measurement of it and |
|
8343
|
Mon Mar 25 23:17:11 2013 |
rana | Summary | IOO | MC | I measured the dark noise and regular intensity
noise in MC trans tonight to get some estimate
for the free running spectrum that the Chas |
|
8354
|
Tue Mar 26 15:43:45 2013 |
rana | Update | IOO | Tuning MC length/FSR | Please attach
the data file of the measurement |
|
8364
|
Thu Mar 28 04:21:40 2013 |
rana | Update | Locking | PRMI progress - even better! |
A key step was turning off
the whitening filters. With the previous |
|
8378
|
Sun Mar 31 17:26:32 2013 |
rana | Update | LSC | Lock of PRMI on sidebands |
Our first move has to be fixing
the whitening switching for REFL55. That's |
|
8390
|
Tue Apr 2 16:13:10 2013 |
rana | Update | SUS | oplev calibration for ITMX, BS | |
|
8394
|
Tue Apr 2 20:52:35 2013 |
rana | Update | Computers | iMac bashed | I changed the default |
|
8397
|
Tue Apr 2 23:14:02 2013 |
rana | Update | LSC | 22/110MHz path for POP |
|
|
8409
|
Wed Apr 3 22:26:51 2013 |
rana | Configuration | Electronics | putting together a 110 MHz LSC demod board | For the 110 MHz demod boards, we
would ideally have a plugin bandpass filter.
If you have some specs in mind, you can email |
|
8410
|
Wed Apr 3 23:22:20 2013 |
rana | Update | optical tables | Optical Table Toolboxes Update | There are some tips for how to appy
nail polish on YouTube from MKNails and MissJenFABULOUS.
Their tips on how to prepare the site for |
|
8419
|
Sat Apr 6 09:21:36 2013 |
rana | Update | 40m Upgrading | Not a fan of the new plastic box yet |
1) We still need to drill and
install the thumbscrew latches |
|