ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
11793
|
Fri Nov 20 15:44:12 2015 |
Koji | Summary | PSL | Added 17.5kHz LPF to the PMC servo | As a final tune of the PMC servo, I've
added 1nF cap at the error signal amplification
stage. The diagram has been updated and uploaded |
 |
11794
|
Sat Nov 21 00:45:30 2015 |
Koji | Update | IOO | IMC fix | Based on the observation of the PMC error
signal, I started measuring the IMC OLTF.
Immediately, it |
   |
11795
|
Sat Nov 21 00:46:33 2015 |
Koji | Update | IOO | IMC OLTF | Here is the comparison before and after
the fix.
Before the work, the UGF was ~40kHz. |
 |
11797
|
Sun Nov 22 12:07:09 2015 |
Koji | Update | IOO | IMC fix | TO DO
Done (Nov 23, 2015) -
Check if the attenuator is still there in |
|
11798
|
Sun Nov 22 12:12:17 2015 |
Koji | Update | IOO | IMC OLTF | Well. I thought a bit more and now I think
it is likely that this is just the servo
bump as you can see in the closed-loop TF. |
|
11800
|
Mon Nov 23 20:32:43 2015 |
Koji | Update | LSC | Frequency source fixed, IMC LO level adjusted | The frequency source was fixed. The IMC
LO level was adjusted.
IMC is locked => OLTF measured |
|
11801
|
Mon Nov 23 21:48:49 2015 |
Koji | Update | LSC | Frequency source fixed, IMC LO level adjusted | The trouble we had: the 29.5 MHz
source had an output of 6 dBm instead
of 13 dBm. |
  |
11802
|
Mon Nov 23 22:12:10 2015 |
Koji | Update | IOO | LO level check for the IMC demod board | In order to check the proper LO level,
the IMC demod board was checked. As
a short summary, -8dBm is the proper input |
 |
11804
|
Tue Nov 24 01:14:23 2015 |
Koji | Update | LSC | ALSY recovered | Sorry, I completely forgot to turn the
Marconi on... |
|
11808
|
Wed Nov 25 10:07:10 2015 |
Koji | Update | IOO | LO level check for the IMC demod board | I didn't finish making the DCC entry
for this module yet.
But the attenuators are |
|
11811
|
Wed Nov 25 16:46:10 2015 |
Koji | Update | IOO | LO level check for the IMC demod board | Awwww. I found that the demod board has
the power splitter (PSCJ-2-1) with one output
unterminated. |
|
11817
|
Thu Nov 26 19:39:27 2015 |
Koji | Update | LSC | Current state of the frequency source, and possible improvement | Uploaded on T1000461
too. |
|
11822
|
Sun Nov 29 12:32:26 2015 |
Koji | Update | LSC | Current state of the frequency source, and possible improvement | I'm not claiming we need to modify
the frequency source immediately as we are
not limited by the oscillator amplitude or |
|
11826
|
Mon Nov 30 15:17:57 2015 |
Koji | Update | LSC | LO level check for the LSC RF distribution box | T1000461
tells us that the nominal LO input is 2dBm
although we don't know what's the |
|
11829
|
Mon Nov 30 18:27:30 2015 |
Koji | Update | LSC | strange behavior of ASDC | It wasn't fully mentioned in ELOG
11814.
We checked the PD first and this behavior |
|
11834
|
Tue Dec 1 17:26:14 2015 |
Koji | Update | General | Megatron maitenence | SLOWDC servo was dead. I followed EricQ's
instruction. |
|
11835
|
Tue Dec 1 20:20:16 2015 |
Koji | Update | General | Megatron maitenence | MC Autolocker got stack somewhere. I had
to go to megatron and kill MC Autolocker.
init relaunched the autolocker |
|
11852
|
Sat Dec 5 21:28:33 2015 |
Koji | HowTo | Cameras | When image capture does not work... | Do we need "make" everytime?
Do you mean just running "modprobe"
didn't work? |
|
11867
|
Wed Dec 9 18:45:58 2015 |
Koji | Summary | General | Network Topology Check | [Eric Q, Gautam, Koji]
We went through the network connections
to produce the mapping of the instruments. |
 |
11873
|
Fri Dec 11 13:28:36 2015 |
Koji | Update | LSC | Power recycling gain estimation from arm loss measurement | Can I ask you to make a plot of the power
recycling gain as a function of the average
arm loss, indicating the current loss value? |
|
11876
|
Fri Dec 11 23:12:09 2015 |
Koji | Summary | COC | Loss map measurement document | Yutaro left detailed slides for his loss
map measurement
https://dcc.ligo.org/LIGO-G1501547 |
|
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 |
|
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 |
|
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 |
|
11964
|
Sat Jan 30 09:56:24 2016 |
Koji | Update | Green Locking | Innolight laser is 10 years old | It is strange that there is no difference
between with and without NE, isn't it? |
|
11968
|
Mon Feb 1 15:43:18 2016 |
Koji | Update | Green Locking | Innolight laser is 10 years old | This is the same one as what you got from
Steve. But you can find full pages.
https://wiki-40m.ligo.caltech.edu/PSL/NPRO |
|
11971
|
Tue Feb 2 18:54:02 2016 |
Koji | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | jiIn fact, it is one of the most difficult
type mode profiling to measure a beam directly
out from a laser source. |
|
11974
|
Thu Feb 4 09:16:46 2016 |
Koji | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I don't think the discrepancy is a
serious issue as long as the mode is clean.
The mode is determined by the NPRO crystal |
|
11989
|
Fri Feb 12 19:07:52 2016 |
Koji | Update | Green Locking | Laser swap - green light recovered but no flashes in the arm | 800e-6 / 0.225^2 = 0.016
=> 1.6%/W
I thought Kiwamu had roughtly 2%/W. |
|
11991
|
Mon Feb 15 13:09:33 2016 |
Koji | Update | General | Something has gone wrong - was there a power outage? | Looks like that's the case. LIGO GC
also sent an e-mail that there was a popwer
glitch. |
|
12000
|
Fri Feb 19 15:12:38 2016 |
Koji | Summary | PEM | Guralp Health Check | I measured the guralp raw outputs
and the TFs using the handheld unit and an
FFT analyzer. |
  |
12037
|
Wed Mar 16 16:02:40 2016 |
Koji | Update | SUS | wire standoff test cut | It looks almost OK, but we need a bit sharper
picture for both the groove and thw wire. |
|
12042
|
Tue Mar 22 21:30:15 2016 |
Koji | Update | IOO | PMCIMC aligned, WFS offset adjusted | The alignment of the PMC adjusted on the
PSL table: Trans 0.737->0.749
The alignment of the IMC adjusrted |
|
12049
|
Sat Mar 26 18:28:24 2016 |
Koji | Update | elog | elogd flakiness | Elogd have been restarted several times
today because it died everytime I submit
something. |
|
12052
|
Mon Mar 28 22:16:44 2016 |
Koji | Update | General | New WiFi router | I configured three more mini wifi extender.
They are ready to use.
We should add these to the host |
|
12072
|
Tue Apr 12 22:41:00 2016 |
Koji | Update | IOO | PMC/IMC aligned, WFS offset adjusted | Did it again.
PMC Trans ~0.739
IMC Trans ~15000 |
|
12146
|
Thu Jun 2 16:35:44 2016 |
Koji | Update | SUS | wire standoffs update | Gap of the prism from the mirror
Sag: s = R(1-Cos[ArcSin[d/2/R]])
- Mirror curvature sag for 2mm |
 |
12223
|
Tue Jun 28 20:43:23 2016 |
Koji | Summary | COC | First Contact cleaning practice | Made a dry run of the in-situ cleaning
for a 3inch optic.
Attachment 1: The Al dummy mass |
7x |
12255
|
Wed Jul 6 19:36:45 2016 |
Koji | Update | General | SUS Vmon | I wanted to know what this Vmon exactly
is. D010001
is telling us that the |
  |
12256
|
Wed Jul 6 20:51:00 2016 |
Koji | Update | General | Seismometer Enclosure Development | SURF 2016 | Circuit1: It is nice to
receive the voltage across the transimpedance
resistor with a high impedance buffer (or |
|
12257
|
Wed Jul 6 21:05:36 2016 |
Koji | Update | Computer Scripts / Programs | New Tabs and Working Summary Pages | I started to receive emails from cron every
15min. Is the email related to this? And
is it normal? I never received these cron |
|
12260
|
Wed Jul 6 21:50:21 2016 |
Koji | Update | Computer Scripts / Programs | New Tabs and Working Summary Pages | It seemed something has been done. And
I got cron emails.
Then, it seemed something has been |
|
12267
|
Thu Jul 7 14:45:26 2016 |
Koji | Update | General | pianosa monitor dead | Johannes, Koji
We obtained two monitors of the
same type from Larry. |
|
12269
|
Thu Jul 7 16:05:55 2016 |
Koji | Update | General | SUS Vmon | Ah, thanks. That makes sense. In that case,
we should remove the texts "30Hz HPF"
from the suspension screens. |
|
12272
|
Fri Jul 8 11:48:09 2016 |
Koji | Update | General | Vent progress - ETMX SUS Coil driver electronics investigation | YES
Move the suspension on the south |
|
12278
|
Fri Jul 8 20:44:09 2016 |
Koji | Update | General | ETMX removed from suspension | In the evening, I went into the clean room
to check how it goes.
- |
6x |
12279
|
Fri Jul 8 21:02:09 2016 |
Koji | Update | Computer Scripts / Programs | MEDM Tab on Summary Pages | Very nice!
Some of the screens are up-to-date,
and some are not. Are the errors associated |
|
12293
|
Tue Jul 12 18:13:19 2016 |
Koji | Update | VAC | N2 bottle replaced | Gautam, Koji
We replaced the right N2 bottle
as it was empty. |
|
12298
|
Wed Jul 13 03:16:47 2016 |
Koji | Update | General | ITMX dust | Multicolor flash light:
- It seems that the usb port charging
doesn't work. |
|
12300
|
Wed Jul 13 21:13:51 2016 |
Koji | Update | General | ETMX guide rod gluing / ETMY Magnet gluing | [Eric, Koji]
ETMX: The Al guide
rod has been glued on the mirror.
ETMY: |
13x |