| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11779
|
Wed Nov 18 11:22:13 2015 |
yutaro | Update | ASC | Loss maps of arm cavities | I got linear relation between these. The
results and method are below.
|
|
|
11780
|
Wed Nov 18 16:51:58 2015 |
Koji | Summary | PSL | PMC servo calibration | Summary
The PMC servo error (MIX OUT MON
on the panel) and actuation (HV OUT MON) |
|
|
11781
|
Wed Nov 18 16:53:17 2015 |
Koji | Summary | PSL | PMC PZT capacitance | The PMC PZT capacitance was measured.
- Turn off the HV supplies. Disconnect
HV OUT cable. |
|
|
11782
|
Wed Nov 18 17:09:22 2015 |
Koji | Summary | PSL | PMC Servo analysis | Summary
The PMC servo was analysed. OLTF
was measured and modeled by ZPK (Attachment |
|
|
11783
|
Wed Nov 18 17:32:36 2015 |
yutaro | Update | Optical Levers | Beam centering for the oplev of ITMY | [yutaro, Koji]
|
|
|
11784
|
Wed Nov 18 20:49:05 2015 |
rana | Update | Computer Scripts / Programs | nodus boot getting full | controls@nodus|~ > df -h
Filesystem
Size Used |
|
|
11785
|
Wed Nov 18 22:26:33 2015 |
yutaro | Update | Optical Levers | Calibration of oplevs for ITMY/ETMY | Based on elog
1403, I calibrated the oplevs for ITMY/ETMY.
Summary of this method is following: |
|
|
11786
|
Wed Nov 18 23:18:07 2015 |
ericq | Update | Computer Scripts / Programs | nodus /boot cleared up | The /boot partition was filling up with
old kernels. Nodus has automatic security
updates turned on, so new kernels roll in |
|
|
11787
|
Wed Nov 18 23:40:01 2015 |
rana | Update | Optical Levers | Calibration of oplevs for ITMY/ETMY | OMG. Please try to use larger fonts and
PDF so that we can read the plots.
|
|
|
11788
|
Thu Nov 19 14:50:34 2015 |
Max Isi | Update | General | New 2D histogram plot for summary pages | A new type of plot is now available for
use in the summary pages, based on EricQ's 2D
histogram plots (elog |
|
|
11789
|
Thu Nov 19 15:16:24 2015 |
ericq | Update | CDS | c1iscey IO chassis now has brackets | [Steve, ericq]
Brackets for the c1iscey IO
chassis cards have been installed. Now, I |
|
|
11790
|
Thu Nov 19 16:06:54 2015 |
yutaro | Update | Optical Levers | Calibration of oplevs for ITMY/ETMY | I'm sorry. I will be careful about
that. And I updated the plots in elog
11785. |
|
|
11791
|
Thu Nov 19 17:06:57 2015 |
Koji | Configuration | CDS | Disabled auto-launching RT processes upon FE booting | We want to startup the RT processes one
by one on boot of FE machines.
Therefore /diskless/root/etc/rc.local |
|
|
11792
|
Fri Nov 20 09:45:39 2015 |
steve | Summary | SUS | oplev laser summary |
|
|
|
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. |
|
|
11796
|
Sun Nov 22 07:09:01 2015 |
rana | Update | IOO | IMC fix | On the demod board there is a 10 dB attenuator
(AT1), which lowers the level to -10 dBm
before the ERA-5. Then it should be 10 dBm |
|
|
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. |
|
|
11799
|
Mon Nov 23 14:45:39 2015 |
ericq | Update | Computer Scripts / Programs | New software | COMSOL 5.1 has been installed at: /cvs/cds/caltech/apps/linux64/comsol51/bin/comsol
MATLAB 2015b has been installed |
|
|
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 |
|
|
11803
|
Mon Nov 23 23:42:56 2015 |
ericq | Update | LSC | ALSY recovered | [ericq, gautam]
Gautam couldn't observe a Y
green beatnote earlier, so we checked |
|
|
11804
|
Tue Nov 24 01:14:23 2015 |
Koji | Update | LSC | ALSY recovered | Sorry, I completely forgot to turn the
Marconi on... |
|
|
11805
|
Tue Nov 24 11:18:47 2015 |
yutaro | Update | Optical Levers | Beam centering for the oplev of ITMY | I made the beam spot |
|
|
11806
|
Tue Nov 24 14:58:40 2015 |
yutaro | Update | LSC | ITMX misaligned | I misaligned ITMX. The oplev servo for
ITMX is now turned off. You can restore ITMX
alignment by running "restore". |
|
|
11807
|
Wed Nov 25 04:24:21 2015 |
rana | Update | IOO | LO level check for the IMC demod board | Hmmm. Very non-standard demod. From the
photo, looks like someone did some surgery
with the attenuators (AT1, AT2, AT3) in the |
|
|
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 |
|
|
11809
|
Wed Nov 25 14:46:53 2015 |
gautam | Update | CDS | c1lsc models restarted | I noticed that all the models running
on C1LSC had crashed when I came in earlier
today. I restarted all of them by ssh-ing |
|
|
11810
|
Wed Nov 25 16:40:32 2015 |
yutaro | Update | LSC | round trip loss of Y arm | I measured round trip loss of Y arm. The
alignment of relevant mirrors was set ideal
with dithering (no offset). |
|
|
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. |
|
|
11812
|
Wed Nov 25 20:07:35 2015 |
rana | Update | IOO | LO level check for the IMC demod board | Perhaps we can replace T1 with a mini-circuits
hybrid 0-90 deg splitter and then remove
the trim caps. (JSPQ-80, JYPQ-30, SCPQ-50) |
|
|
11813
|
Wed Nov 25 22:37:12 2015 |
yutaro | Update | LSC | removal of Gautam's cable in 1Y2 and restoration of POYDC | [yutaro, Koji]
We disconnected the cable that
was connected to CH5 of the whitening filter in |
|
|
11814
|
Wed Nov 25 22:59:42 2015 |
yutaro | Update | LSC | AS table optics realignment | I slightly changed the orientation
of a few mirrors on AS table that
are used to make the AS light get into PDs, |
|
|
11815
|
Wed Nov 25 23:17:34 2015 |
yutaro | Update | LSC | strange behavior of ASDC | [yutaro, Koji]
I noticed that ASDC level changes
depending on the angle of ITMY when trying |
|
|
11816
|
Wed Nov 25 23:34:52 2015 |
yutaro | Update | LSC | round trip loss of Y arm | [yutaro, Koji]
Due to the strange behavior (elog |
|
|
11817
|
Thu Nov 26 19:39:27 2015 |
Koji | Update | LSC | Current state of the frequency source, and possible improvement | Uploaded on T1000461
too. |
|
|
11818
|
Fri Nov 27 03:38:23 2015 |
yutaro | Summary | LSC | round trip loss of Y arm | Tonight I measured "loss map"
of ETMY. The method to calculate round trip
loss is same as written in elog |
|
|
11819
|
Fri Nov 27 22:20:24 2015 |
yutaro | Update | LSC | round trip loss of Y arm | Here, I upload data I took last night,
including the power of reflected power (locked/misaligned)
and transmitted power for each point (attachement |
|
|
11820
|
Sat Nov 28 11:46:40 2015 |
yutaro | Update | LSC | possible error source of loss map measurement | I found that TRY level degraded and the
beam shape seen with CCD camera at AS port
was splitted when the beam spot on ETMY was |
|
|
11821
|
Sun Nov 29 05:23:57 2015 |
rana | Update | LSC | Current state of the frequency source, and possible improvement | I need some more hints to understand the
improvement, although its generally good
to re-build it considering the sad state |
|
|
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 |
|
|
11823
|
Mon Nov 30 10:41:45 2015 |
yutaro | Update | LSC | Does a baffle in front of ETMY have effect on loss map measurement? | It might have, so I think
I need to estimate shift of beam spot
more preciely. |
|
|
11824
|
Mon Nov 30 12:19:38 2015 |
yutaro | Update | Computer Scripts / Programs | image capture | On VIDEO.adl, Image Capture and Video Capture
did not seem to work and gave me some errors,
so I fixed following two things: |
|
|
11825
|
Mon Nov 30 14:12:14 2015 |
ericq | Update | LSC | LO level check for the LSC RF distribution box | I checked the RF levels at the LSC LO distribution
box, with the agilent scope and a handful
of couplers. This was all done with the Marconi |
|
|
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 |
|
|
11827
|
Mon Nov 30 16:33:06 2015 |
ericq | Update | LSC | strange behavior of ASDC | One possible explanation of this behavior is
simply poor centering of the AS beam
on AS55 (whose DC level provides ASDC, if |
|
|
11828
|
Mon Nov 30 17:17:30 2015 |
yutaro | Update | LSC | Does a baffle in front of ETMY have effect on loss map measurement? | With captured images of ETMYF, I measured
the shift of the beam spot on ETMY.
The conclusions are: |
|