| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
6294
|
Sat Feb 18 12:23:09 2012 |
Den | Update | IOO | MC | When I came to the 40m this afternoon,
the MC was unlocked. Here is the trend of
MC_F for last 2 hours |
|
|
6295
|
Sat Feb 18 16:58:59 2012 |
kiwamu | Update | IOO | MC suspension realigned | [ Den / Kiwamu]
We
have realigned the MC suspensions so that |
|
|
6300
|
Tue Feb 21 16:10:29 2012 |
kiwamu | Update | IOO | degradation in input PZT1 | PZT1,
the one with Koji's custom mid-HV driver
(#5447 |
|
|
6351
|
Mon Mar 5 03:50:49 2012 |
kiwamu | Update | IOO | PZT1 PITCH railing | PZT1
started railing in the pitch direction and
because of this TRY doesn't go more than |
|
|
6357
|
Mon Mar 5 17:07:58 2012 |
kiwamu | Update | IOO | realigned MC | I
have slightly shifted the MC beam pointing
to relax the PZT1 PITCH. As a result the |
|
|
6388
|
Thu Mar 8 23:37:03 2012 |
kiwamu | Update | IOO | dither Y arm dither script | I
disabled the feedback to the PZT1 PITCH in
the Y arm dithering scripts so that it won't |
|
|
6410
|
Wed Mar 14 04:03:37 2012 |
kiwamu | Update | IOO | PZT1 and associate extra works | As the PZT1 has not been functional, I
have been aligning the Y arm to the input
beam instead of aligning the beam to the |
|
|
6426
|
Fri Mar 16 16:03:03 2012 |
kiwamu | Update | IOO | MC alignment servo : put some offsets in the TRANS QPD signal | The
MC alignment servo wasn't great in the last
1 hour or so as it kept disturbing the MC |
|
|
6429
|
Tue Mar 20 09:59:01 2012 |
steve | Update | IOO | Laser tripped off | Today is janitor day. It still does not
explain why the 2W Innolight tripped off
about an hour ago. All back to normal. |
|
|
6440
|
Fri Mar 23 01:59:59 2012 |
kiwamu | Update | IOO | REFL beam currently unavilable | [Suresh / Kiwamu]
Currently
the REFL beam is bypassed by additional mirrors |
|
|
6441
|
Fri Mar 23 05:10:46 2012 |
Suresh | Update | IOO | Beam Profile measurements: Errors too large to yield good fits. | [Kiwamu, Suresh]
Today we attempted to
measure the beam profile of the REFL beam |
|
|
6444
|
Mon Mar 26 15:15:16 2012 |
kiwamu | Update | IOO | expected beam profile of PRM reflection | I have estimated how the mode profile
of the PRM reflection should be, as shown
in the plot blow. |
|
|
6445
|
Mon Mar 26 16:25:44 2012 |
kiwamu | Update | IOO | expected v.s. measured beam profile of PRM reflection | [Suresh / Kiwamu]
We did the 2nd round of
the PRM reflection mode scan on Friday. |
|
|
6446
|
Mon Mar 26 18:04:43 2012 |
kiwamu | Update | IOO | mode scan at the REFL port | For those who are interested in the
actual data, I attache the actual data in
zip file together with a python plot code. |
|
|
6447
|
Mon Mar 26 23:47:54 2012 |
Suresh | Update | IOO | Beam Profile measurement: IPPOS beam | [Keiko, Suresh]
Keiko and I measured
the IPPOS beam profile. The fit parameters |
|
|
6448
|
Tue Mar 27 02:05:40 2012 |
Suresh | Update | IOO | Beam Profile measurement: IPPOS beam |
|
|
|
6449
|
Tue Mar 27 02:18:31 2012 |
keiko | Update | IOO | Beam Profile measurement: IPPOS beam | Keiko, Rana, Suresh
Related to the beam profile of IPPOS
today, we tried to measure the beam size |
|
|
6450
|
Tue Mar 27 02:46:28 2012 |
kiwamu | Update | IOO | REFL beam available | The dump and some temporary mirrors
were removed and now the REFL beam is available
again. |
|
|
6451
|
Tue Mar 27 11:54:18 2012 |
Jenne | Update | IOO | Beam Profile measurement: IPPOS beam | I'd like to know what we expect for these
numbers. I've added to Kiwamu's drawing
some more distances, so I can calculate the |
|
|
6452
|
Tue Mar 27 16:06:59 2012 |
keiko | Update | IOO | Beam Profile measurement: IPPOS beam | I changed the ETMY CCD camera angle
so that we can see the suspension frame in
order to repeat the same thing as yesterday. |
|
|
6453
|
Tue Mar 27 17:19:02 2012 |
Koji | Update | IOO | Beam Profile measurement: IPPOS beam | The mode looks quite terrible in the plot,
but in reality it is an illusion of the plot. |
|
|
6454
|
Tue Mar 27 17:38:03 2012 |
Jenne | Update | IOO | Another possibility / thought | I'm meditating over the mode matching from
the mode cleaner to the ITMs, and I had another
thought: |
|
|
6455
|
Tue Mar 27 17:52:08 2012 |
Koji | Update | IOO | Another possibility / thought | It is quite likely that we touched the
Faraday in Nov 2010.
In this entry http://nodus.ligo.caltech.edu:8080/40m/3874 |
|
|
6456
|
Tue Mar 27 18:03:46 2012 |
Jenne | Update | IOO | Beam Profile measurement: IPPOS beam | This is wrong!
See following elog for corrected plot (and |
|
|
6457
|
Tue Mar 27 21:20:32 2012 |
Jenne | Update | IOO | Beam Profile measurement: IPPOS beam |
|
|
|
6458
|
Tue Mar 27 21:37:51 2012 |
keiko | Configuration | IOO | Beam Profile measurement: IPPOS beam | From the mode measurement I and Suresh
have done yesterday, I calculated what beam
size we expect at ETM ((1) upper Fig.1) and |
9x |
|
6459
|
Tue Mar 27 23:37:35 2012 |
Suresh | Update | IOO | Beam Profile measurement: IPPOS beam |
|
|
|
6460
|
Wed Mar 28 01:17:29 2012 |
Jenne | Update | IOO | Beam Profile measurement: IPPOS beam | As I was a little dissatisfied with the
inaccuracy in the distance numbers in Kiwamu's
sketch, I went back to the 18 Dec 2010 table |
|
|
6461
|
Wed Mar 28 18:26:47 2012 |
Jenne | Update | IOO | Beam Profile measurement: IPPOS beam | More calculations....
Game Plan: Using MC
waist measured beam as the starting point |
|
|
6462
|
Wed Mar 28 20:54:02 2012 |
Jenne | Update | IOO | Beam Profile measurement: IPPOS beam | I fitzed by hand with the numbers for the
incident angles on MMT1 and MMT2, and then
let the code optimize the position of MMT1 |
|
|
6476
|
Mon Apr 2 18:58:32 2012 |
Jenne | Update | IOO | Beam Profile measurement: IPPOS beam | Suresh noted that I never wrote down the
waist positions of the beam propagated through
the MMT (based on where we think it is from |
|
|
6477
|
Mon Apr 2 23:06:38 2012 |
Suresh | Update | IOO | Beam Profile measurement: IPPOS beam: Mystery deepens |
|
|
|
6496
|
Fri Apr 6 15:06:05 2012 |
Den | Update | IOO | 1 Hz resonance | I think we can try to damp 1 Hz resonance
more. In September it was not seen because
of the digital noise. After we've figured |
|
|
6516
|
Tue Apr 10 17:02:29 2012 |
Jenne | Update | IOO | Mode matching recollections and conclusions | ...Mostly just recollections at this point.
I re-looked at the mode matching's
sensitivity to misplaced optics. Here |
|
|
6522
|
Wed Apr 11 18:19:51 2012 |
Jenne | Update | IOO | Mode matching recollections and conclusions | Another histogram. This one allows
the MMT mirror positions to move, the MMT
incident angle for both curved optics to |
|
|
6526
|
Thu Apr 12 01:17:56 2012 |
Suresh | Update | IOO | Beam Profile measurement: IPPOS beam: Possible Clipping | [Suresh, Jenne]
The
input beam is most probably being clipped |
|
|
6531
|
Thu Apr 12 23:12:16 2012 |
Suresh | Update | IOO | Beam Profile measurement: IPPOS beam: Possible Clipping |
|
6x |
|
6575
|
Thu Apr 26 18:17:56 2012 |
Suresh | Update | IOO | MC WFS: Tweaked the WFS offsets | [Jamie, Suresh]
Yesterday Den and Koji reported that
the WFS loops were causing the MC to become |
|
|
6611
|
Mon May 7 01:07:58 2012 |
Den | Update | IOO | seismic in mcf | I tried to figure out where additional
(to seismic) noise enters to MC_F, so the
coherence below 1 Hz is low (~0.2-0.5). I've |
|
|
6612
|
Mon May 7 12:57:34 2012 |
Den | Update | IOO | WFS noise in MC | I've measured coherence between seismometer
signals and OSEMS of MC 1,2,3
|
|
|
6613
|
Mon May 7 17:28:29 2012 |
Den | Update | IOO | WFS noise in MC |
|
|
|
6614
|
Mon May 7 19:39:52 2012 |
Koji | Update | IOO | WFS noise in MC | OK. Then we should make this number bigger
such that the coherence is still completely
maintained. |
|
|
6615
|
Mon May 7 20:15:37 2012 |
Den | Update | IOO | WFS noise in MC |
|
|
|
6641
|
Fri May 11 17:21:56 2012 |
Jenne | Update | IOO | OAF left enabled - MC unlocked for more than an hour | No leaving the OAF running until you're
sure (sure-sure, not kind of sure, not pretty
sure, but I've enabled guardians to make |
|
|
6652
|
Mon May 21 07:45:39 2012 |
steve | Update | IOO | PMC locked | I locked the PMC and the MC followed instantly. |
|
|
6660
|
Tue May 22 13:06:11 2012 |
Jenne | Update | IOO | WFS didn't turn off automatically | I just sat down in the control room, and
discovered the PMC (and everything else)
unlocked. I relocked the PMC, but the |
|
|
6665
|
Wed May 23 10:40:21 2012 |
steve | Update | IOO | PMC locked |
|
|
|
6669
|
Wed May 23 21:32:15 2012 |
Suresh | Update | IOO | WFS didn't turn off automatically |
|
|
|
6672
|
Thu May 24 10:10:04 2012 |
steve | Update | IOO | PMC locked | The PMC behavior is not changed.
|
|
|
6679
|
Thu May 24 19:39:18 2012 |
Suresh | Update | IOO | MC and WFS alignment adjusted | [Yuta, Suresh]
We found that the MC was not locking
and that the alignment between PSL and MC |
|