| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11524
|
Sat Aug 22 15:48:32 2015 |
Koji | Summary | LSC | Arm locking recovery | As per Ignacio's request, I restored
the arm locking.
- MC WFS relief |
|
|
11551
|
Tue Sep 1 02:44:44 2015 |
Koji | Summary | CDS | c1oaf, c1mcs modified for the IMC angular FF | [Koji, Ignacio]
In order to allow us to work on
the IMC angular FF, we made the signal paths |
|
|
11569
|
Thu Sep 3 19:52:24 2015 |
rana | Summary | SUS | SUS drift monitor | Since Andrey's SUS Drift mon screen
back in 2007, we've had several versions
which used different schemes and programming |
|
|
11590
|
Thu Sep 10 09:37:34 2015 |
Ignacio | Summary | IOO | Filters left on MCL static module | The following MCL filters
were left loaded in the T240-X and T240-Y |
|
|
11597
|
Tue Sep 15 01:14:10 2015 |
rana | Summary | LSC | need to check LSC Whitening switch logic ... again | Tonight we noticed that the REFL_DC signal
has gone bipolar, even though the whitening
gain is 0 dB and the whitening filter is |
|
|
11598
|
Tue Sep 15 15:01:23 2015 |
rana | Summary | LSC | disabling the LSC AA filters + mod to whitening | While investigating the BIO situation with
the LSC machine and the iscaux2 processor
last night, we wondered if maybe the Anti-Aliasing |
|
|
11599
|
Tue Sep 15 15:10:48 2015 |
gautam, ericq, rana | Summary | LSC | PRFPMI lock & various to-do's | [SIZE=3]I was observing Eric while he was
attempting to lock the PRFPMI last night.
The handoff from ALS to LSC was not very |
|
|
11601
|
Tue Sep 15 18:35:21 2015 |
ericq | Summary | LSC | some further notes | About the analog CARM control with ALS:
We're looking at using a Sigg
designed remotely switchable delay line box |
|
|
11603
|
Tue Sep 15 20:44:13 2015 |
gautam | Summary | LSC | Checking the delay line phase shifter DS050339 | I checked out the delay line phase shifter
[URL=https://dcc.ligo.org/public/0016/D050339/000/D050339-A.pdf]D050339[/URL],
([URL=https://dcc.ligo.org/public/0001/T050250/001/T050250-v1.pdf]theory |
|
|
11604
|
Wed Sep 16 03:37:06 2015 |
Koji | Summary | Green Locking | Workable delay line setup prepared | [Koji Gautam]
The variable delay line has been
setup for practical use. The hardware and |
6x |
|
11606
|
Wed Sep 16 15:04:33 2015 |
ericq | Summary | LSC | DC PD Whitening Board Fixed |
|
|
|
11609
|
Thu Sep 17 03:48:10 2015 |
ericq | Summary | LSC | some further notes | Something odd is happening with the CM
board. Measuring from either input to OUT1
(the "slow output") shows a nice |
|
|
11611
|
Thu Sep 17 13:06:05 2015 |
ericq | Summary | LSC | Low input impedance on CM board | As it turns out, our version of the common
mode board does not have
high input impedence. I think this is what |
|
|
11615
|
Thu Sep 17 19:58:06 2015 |
gautam | Summary | Computer Scripts / Programs | Frequency counting algorithm | I made some changes to the c1tst model
running on c1iscey in order to test my algorithm
for frequency counting. I followed the steps |
|
|
11628
|
Mon Sep 21 18:31:06 2015 |
gautam | Summary | Computer Scripts / Programs | Frequency counting algorithm | I have been
working on setting up a frequency counting
module that can give us a readout of the |
6x |
|
11629
|
Mon Sep 21 23:18:55 2015 |
ericq | Summary | Computer Scripts / Programs | Frequency counting algorithm | I definitely think lowpassing the output
is the way to go. Since this frequency readback
will be used for slow control of the beatnote |
|
|
11631
|
Tue Sep 22 02:11:17 2015 |
rana | Summary | Computer Scripts / Programs | Frequency counting algorithm | I was going to suggest using a software
PLL, but perhaps averaging gives the same
result. The same ADC signal can be fed to |
|
|
11635
|
Tue Sep 22 16:52:36 2015 |
ericq | Summary | General | Random Notes | Some things bouncing around my head that
haven't made it to ELOG yet:
Last week, Rana and I were |
|
|
11763
|
Fri Nov 13 22:32:54 2015 |
Koji | Summary | PSL | PMC LO degraded, usual ERA-5 replacement, LO recovered | [Yutaro, Koji]
We found that the PMC LO level
was fluctuating in a strage way (it was not |
|
|
11764
|
Sat Nov 14 00:52:25 2015 |
Koji | Summary | CDS | Investion on EPICS freeze | [Yutaro, Koji]
Recently "EPICS Freeze"
is so frequent and the normal work on the |
|
|
11765
|
Sun Nov 15 22:43:48 2015 |
Koji | Summary | PSL | PMC LO degraded, usual ERA-5 replacement, LO recovered | I think the IMC locking was somewhat improved.
Still it is not solid as long time before.
Before the PMC fix (attachment |
|
|
11768
|
Mon Nov 16 19:05:59 2015 |
Koji | Summary | PSL | PMC servo circuit review, follow up measurements | PMC follow up measurements have been done.
The servo circuit was reviewed.
Now the PMC, IMC, X/Y arms are |
|
|
11769
|
Mon Nov 16 21:32:49 2015 |
Koji | Summary | PSL | PMC servo circuit review, follow up measurements | The result of the precise inspection
for the PMC servo board for the 40m was done.
The record, including the |
|
|
11775
|
Tue Nov 17 16:21:10 2015 |
Koji | Summary | PSL | PMC servo circuit review, follow up measurements | I'm still analyzing the open loop TF
data. Here I report some nominal settings
of the PMC servo |
|
|
11776
|
Tue Nov 17 20:40:08 2015 |
yutaro | Summary | ASC | Loss maps of arm cavities | In preparation for the measurement of loss
maps of arm cavities, I measured the relationship
between: |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
11857
|
Mon Dec 7 11:11:25 2015 |
yutaro | Summary | LSC | round trip loss of X arm | On the day before yesterday and in this
morning, I measured loss map of ETMX. I reported
the method I used to change the beam spot |
|
|
11861
|
Tue Dec 8 11:24:45 2015 |
yutaro | Summary | Computer Scripts / Programs | Scripts for loss map measurement | Here I explain usage of my scripts
for loss map measurement. There are 7 script
files in a same directory /opt/rtcds/caltech/c1/scripts/lossmap_scripts. With |
|
|
11864
|
Tue Dec 8 15:57:16 2015 |
yutaro | Summary | LSC | Power recycling gain estimation from arm loss measurement | I estimated power recycling gain with the
results of arm loss measurement.
From elog |
|
|
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. |
|
|
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 |
|
|
11900
|
Wed Dec 23 15:43:02 2015 |
rana | Summary | PSL | PMC FSS IMC RF summing box | The EOM upstream of the PMC is used as
the phase corrector for the FSS/IMC servo.
It is also used to apply the 35.5 MHz PDH |
|
|
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. |
|
|
12032
|
Sat Mar 12 22:23:37 2016 |
rana | Summary | IOO | PMC relocked | Found it locked on TEM01 mode.
Sweets in the fridge for non-PhD
holders, courtesy of the highest levels of |
|
|
12044
|
Wed Mar 23 15:23:12 2016 |
Steve | Summary | PEM | Guralps as connected | We have one calibration sheet of GUR- B, from 26
June 2008, model CMG-T40-0008, |
|
|
12093
|
Wed Apr 27 14:06:31 2016 |
rana | Summary | General | meeting notes |
Gautam will get
help from Johannes and finish EX table by
Monday.
Steve |
|
|
12102
|
Mon May 2 17:06:58 2016 |
rana | Summary | COC | G&H optics to Fullerton/HWS for anneal testing | Steve sent 4 of our 1" diameter G&H
HR mirrors to Josh Smith at Fullerton for
scatter testing. Attached photo is our total |
|
|
12125
|
Mon May 23 10:55:49 2016 |
steve | Summary | SUS | ITMX oplev laser replaced |
May 23, 2016 |
|
|
12126
|
Mon May 23 15:51:32 2016 |
steve | Summary | SUS | oplev laser summary updated |
|
|
|
12128
|
Tue May 24 10:21:36 2016 |
ericq | Summary | SUS | ITMX Oplev loops | I did a quick measurement of the ITMX oplev
loops, both pitch and yaw have about the
same upper UGF as previous measurements with |
|
|
12175
|
Tue Jun 14 11:29:25 2016 |
Johannes | Summary | ASC | YArm OpLev Calibration | In preparation for the armloss map I checked
the calibration of the Y-Arm ITM and ETM
OpLevs with the method originally described |
|
|
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 |
|
12239
|
Fri Jul 1 17:51:28 2016 |
Praful | Summary | Electronics | Replacing DIMM on Optimus | There has been an ongoing memory error
in optimus with the following messages:
controls@optimus|~ |
|
|
12306
|
Fri Jul 15 17:44:37 2016 |
Aakash | Summary | General | Acromag Setup | SURF2016 | Aidan has described the physical connections
and initial setup here : https://nodus.ligo.caltech.edu:30889/ATFWiki/doku.php?id=main:resources:computing:acromag#recovering_from_a_terminal_power_communication_outage
. |
|
|
12337
|
Tue Jul 26 14:24:38 2016 |
Koji | Summary | VAC | Purge compressed air system at LHO | I've visited the purge clean
air system at LHO Yarm mid-station with John
Worden. |
12x |