| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
11742
|
Mon Nov 9 15:59:06 2015 |
ericq | Update | LSC | FSR and linewidth measurements with phase tracker |
|
|
|
11741
|
Mon Nov 9 14:24:36 2015 |
yutaro | Update | LSC | FSR and linewidth measurements with phase tracker | I'd like to add a few calculation results,
mode matching ratio for Y arm and modulation
depth. |
|
|
11740
|
Mon Nov 9 11:34:51 2015 |
yutaro | Update | LSC | FSR and linewidth measurements with phase tracker | I fitted the data obtained with the FSR
and linewidth measurements and I've got
FSR and finesse of y-arm by fitting. |
|
|
11739
|
Mon Nov 9 09:27:44 2015 |
Steve | Update | PSL | MC is not happy | I just turned off the PSL enclousure lights.
|
|
|
11738
|
Fri Nov 6 15:56:00 2015 |
gautam | Update | LSC | FSR and linewidth measurements with phase tracker | Summary:
I performed a preliminary calibration
of the X and Y phase trackers, and found |
|
|
11737
|
Thu Nov 5 10:48:21 2015 |
yutaro | Update | Electronics | offset voltage vs. gain of common mode servo | I report the results of the measurement
to know how offset voltage of common
mode servo changes when the gain is changed. |
|
|
11736
|
Thu Nov 5 03:04:13 2015 |
gautam | Update | CDS | Frequency counting - systematics and further changes | I've
made a few more changes to the frequency
counting code - these are mostly details |
|
|
11735
|
Thu Nov 5 02:18:32 2015 |
gautam | Update | LSC | FSR and linewidth measurements with phase tracker | While the ETMx issues are being investigated
- with Eric's help, I took some
data from arm scans of the Y arm through |
|
|
11733
|
Wed Nov 4 22:42:02 2015 |
ericq | Update | SUS | ETMX oplev servo disabled | During this time period, it looks like
there was maybe one excursion. Here are the
individual OSEM signals, which I think to |
|
|
11732
|
Wed Nov 4 20:16:58 2015 |
yutaro | Update | Electronics | offset voltage vs. gain of common mode servo | At 1Y2 rack, I measured offset voltage
of the common mode servo (D040180-B)
with the gain of it varied. |
|
|
11731
|
Wed Nov 4 16:12:07 2015 |
ericq | Update | CDS | OPTIMUS | There is a new machine on the martian network: 32
cores and 128GB of RAM. Probably this is
more useful for intensive number crunching |
|
|
11730
|
Wed Nov 4 15:48:58 2015 |
Steve | Update | PEM | ETMX wirestadoff vs EQ | ETMX was not much effected by this 8.3
M Chilian earthquake. It was kicked up and
it was kicking for hours after it. This is |
|
|
11729
|
Wed Nov 4 14:44:00 2015 |
ericq | Update | SUS | ETMX oplev servo disabled | I've turned the ETMX oplev servos off
for the time being. (At the input side, so
that no scripts will accidently turn it on). |
|
|
11728
|
Wed Nov 4 08:04:53 2015 |
Steve | Update | safety | safety training | Yutaro Enamoto, visiting graduate student
of Seiji received 40m specific basic safety
training. |
|
|
11727
|
Tue Nov 3 18:49:41 2015 |
gautam | Update | SUS | ETMX kicked up | I was trying to take a few more IR transmission
scans with ALS when the ETMX got kicked again.
I'm not sure how to fix this, so for |
|
|
11726
|
Tue Nov 3 03:12:46 2015 |
ericq | Update | LSC | DRFPMI work | Tonight was kind of a wash.
We spent some time retaking
single arm scans with Gautam's frequency |
|
|
11725
|
Mon Nov 2 17:39:01 2015 |
Koji | Frogs | General | DRFPMI celebration | やったー！Yatta! |
|
|
11724
|
Fri Oct 30 17:49:27 2015 |
Steve | Update | SUS | ETMX kicked up | The oplev and the LSC are off. |
|
|
11723
|
Fri Oct 30 16:56:04 2015 |
gautam | Update | CDS | is there a problem with the SCHMITTTRIGGER CDS library part? | Over the course of my investigations into
the systematic errors in the frequency readout
using digital frequency counting, I noticed |
|
|
11722
|
Thu Oct 29 03:25:49 2015 |
ericq | Update | LSC | DRFPMI work | [ericq, Gautam]
The length of DRFPMI lock did not
increase much tonight, but we got a ~80 second sensing |
|
|
11721
|
Wed Oct 28 17:06:30 2015 |
ericq | Update | ASC | New PRC Angular FF filters installed | I've installed new filters for the
T240 -> PRM static online angular feedforward
that were trained after some of the recent |
|
|
11720
|
Wed Oct 28 14:07:44 2015 |
Koji | Update | IOO | MC WFS Offsets update | MC WFS offsets were updated to have a better
operating point.
|
|
|
11719
|
Tue Oct 27 10:08:12 2015 |
Steve | Update | VAC | CC vacuum gauges | CC1 and CC2 are working again. Why did
they start working again ?
|
|
|
11718
|
Tue Oct 27 03:56:52 2015 |
ericq | Update | LSC | DRFPMI work | A handful of DRFPMI locks tonight, longest
one was ~7 minutes.
EPICS/network latency has been |
|
|
11716
|
Tue Oct 27 03:46:26 2015 |
ericq | Update | SUS | MC2 F2P mis-tuned | D'oh. Good point.
Reverted for now; I'm thinking
about doing laser pointer->MC2 QPD... |
|
|
11715
|
Mon Oct 26 19:10:59 2015 |
gautam | Update | Green Locking | AUX PDH loop characterization | I began my attempts to characterize the
PDH loops at the X end today. My goal was
to make the following measurements: |
|
|
11714
|
Mon Oct 26 18:59:25 2015 |
gautam | Update | LSC | Green beatnote couplers installed | I found
(an old) 10 dB coupler in the RF component
shelves near MC2 - it has BNC connectors |
|
|
11713
|
Mon Oct 26 18:10:38 2015 |
Ignacio | Update | IOO | Last Wiener MCL subtractions | As per Eric's request, here is the
code and TF measurement that was used to
calculate the MC2 FF filter that is loaded |
|
|
11712
|
Sat Oct 24 12:34:43 2015 |
gautam | Update | CDS | Frequency counting - workable setup prepared | Sorry for the confusion - I did mean Green
beat frequency, and I had neglected the
factor of 2 in my earlier calculations. However, |
|
|
11711
|
Fri Oct 23 21:58:10 2015 |
rana | Update | SUS | MC2 F2P mis-tuned | The OSEMs cannot be used for coil balancing
above ~10 Hz. The main coupling path from
OSEM drive to sensor is not through the mirror |
|
|
11710
|
Fri Oct 23 19:27:19 2015 |
Koji | Update | CDS | Frequency counting - workable setup prepared | It is a nice scan. I'm still thinking
about the equivalence of the moving average
and the FIR low pass that I have mentioned |
|
|
11709
|
Fri Oct 23 18:36:48 2015 |
gautam | Update | CDS | Frequency counting - workable setup prepared | I've
made quite a few changes in the software
as well as the hardware of the digital frequency |
|
|
11708
|
Fri Oct 23 09:55:50 2015 |
Steve | Update | LSC | stable days | |
|
|
11707
|
Thu Oct 22 08:52:04 2015 |
Steve | Update | VAC | clean RGA scan after sweaty Maglev | Clean comparable scan at vacuum normal.
There was no backstreaming. |
|
|
11706
|
Wed Oct 21 15:42:56 2015 |
Steve | Update | VAC | vacuum gauge check | Convectron gauge check:
Brand new 10 years old convectron
gauge at atm was swapped into the place of |
|
|
11705
|
Wed Oct 21 10:03:15 2015 |
Steve | Update | VAC | after running out of N2 |
|
|
|
11704
|
Tue Oct 20 17:36:01 2015 |
gautam | Update | CDS | Frequency counting with moving average | I'm working on setting up a moving-average
in the custom C code block that counts the
zero crossings to see if this approach is |
|
|
11703
|
Tue Oct 20 16:27:04 2015 |
ericq | Update | VAC | vacuum VME machines rebooted | [ericq, Gautam, Steve]
Following roughly the same procedure
as ELOG |
|
|
11702
|
Tue Oct 20 15:51:44 2015 |
ericq | Update | SUS | MC2 F2P tuned | Using a modified version of Hang's
deMod_deCoup scripts, I tuned the MC2 coil
output matrix to minimize the appearance |
|
|
11701
|
Tue Oct 20 11:24:29 2015 |
ericq | HowTo | LSC | How to DRFPMI | Herein,
I will describe
the current settings and procedures used |
|
|
11700
|
Mon Oct 19 16:20:52 2015 |
ericq | Update | LSC | Green beatnote couplers installed | Last Friday, I installed some RF couplers
on the green BBPDs' outputs, and sent
them over to Gautam's frequency divider |
|
|
11699
|
Mon Oct 19 16:16:01 2015 |
ericq | Update | CDS | C1ALS crashes | Gautam was working on his digital frequency
counter stuff when the c1als model crashed.
I had trouble bringing it back until I realized |
|
|
11698
|
Mon Oct 19 15:23:22 2015 |
ericq | Update | LSC | Longer DRFPMI lock | Here is a longer lock, about 100 seconds
RF only, from later that same night. The
in-loop CARM and DARM error signals have |
|
|
11697
|
Mon Oct 19 11:20:34 2015 |
gautam | Update | VAC | RGA scan reset | Steve pointed out that in the aftermath
of the Nitrogen running out a couple of times
last week, the RGA had shut itself off thinking |
|
|
11696
|
Sat Oct 17 18:55:07 2015 |
rana | Update | LSC | DRFPMI Locked for 20 sec | in addition
to Koji's words I feel like we should |
|
|
11695
|
Fri Oct 16 18:27:52 2015 |
Steve | Update | VAC | vacuum normal condition | Vacuum normal configuration with VM1-closed,
VM2-open valve positions. Power load normal
24V 0.2A |
|
|
11694
|
Thu Oct 15 14:39:58 2015 |
ericq | Update | Computer Scripts / Programs | nodus web apache simlinks too soft |
|
|
|
11693
|
Thu Oct 15 10:59:12 2015 |
Koji | Update | LSC | DRFPMI Locked for 20 sec | Great
job!
Many thanks Eric, Gautam, and all |
|
|
11692
|
Thu Oct 15 04:14:14 2015 |
ericq | Update | LSC | DRFPMI Locked for 20 sec | Fast ALS was still a problem tonight. I
don't think high frequency ALS noise
saturating the PC drive is the issue; I put |
|
|
11691
|
Thu Oct 15 03:08:57 2015 |
ericq | Update | LSC | DRFPMI Locked for 20 sec | [ericq, Gautam]
For real this time.
|
|