| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
8875
|
Thu Jul 18 21:12:58 2013 |
gautam | Configuration | endtable upgrade | AI Board-D000186-All channels modified |
I carried some further modifications
and tests to the AI Board. Details and observations |
|
|
8877
|
Thu Jul 18 23:34:40 2013 |
gautam | Configuration | endtable upgrade | Coarse adjustment of PZT axes orientation in mount | I have
managed to orient the PZT in the mount such
that its axes are approximately aligned with |
|
|
8883
|
Fri Jul 19 22:51:40 2013 |
gautam | Configuration | endtable upgrade | Second mirror glued to PZT and mounted |
I |
|
|
8884
|
Fri Jul 19 23:35:31 2013 |
gautam | Configuration | endtable upgrade | Preliminary Calibration of PZT | I recalibrated
the QPD today as I had shifted its position
a little. I then identified the linear range |
|
|
8900
|
Tue Jul 23 04:07:48 2013 |
gautam | Update | CDS | Excitation points set up on c1scx |
In
light of recent events and the decision to |
|
|
8909
|
Tue Jul 23 16:47:01 2013 |
gautam | Update | CDS | Excitation points set up on c1scx | I just compiled and installed the
model with the excitation points on c1scx
and then restarted framebuilder. The channels |
|
|
8911
|
Tue Jul 23 19:38:58 2013 |
gautam | Update | CDS | Characterisation of DAC at 1X9 |
I
just finished carrying out the same checks |
|
|
8912
|
Tue Jul 23 20:41:40 2013 |
gautam | Configuration | endtable upgrade | Full range calibration and installation of PZT-mounted mirrors | Given
that the green beam is to be used as the |
|
|
8932
|
Mon Jul 29 13:39:25 2013 |
gautam | Configuration | endtable upgrade | PZT Driver Board-further changes |
I have |
|
|
8935
|
Mon Jul 29 21:57:45 2013 |
gautam | Configuration | endtable upgrade | Hardware installed at 1X9 | The following hardware |
|
|
8942
|
Tue Jul 30 19:40:47 2013 |
gautam | Configuration | endtable upgrade | DAC-PZT Driver Board Output Signal Chain Tested |
[Alex, Gautam]
|
|
|
8943
|
Tue Jul 30 19:44:05 2013 |
gautam | Configuration | endtable upgrade | Second mirror glued to PZT and mounted |
I have |
|
|
8949
|
Thu Aug 1 12:12:35 2013 |
gautam | Update | CDS | New model for endtable PZTs | I have
made a new model for the endtable PZT servo,
and have put it in c1iscex. Model name is |
|
|
8950
|
Thu Aug 1 13:09:17 2013 |
gautam | Update | CDS | New model for endtable PZTs-procedure |
These
are roughly the steps I followed in setting |
|
|
8952
|
Thu Aug 1 15:28:44 2013 |
gautam | Update | CDS | New model for endtable PZTs-problem solved |
|
|
|
8956
|
Thu Aug 1 20:58:56 2013 |
gautam | Update | CDS | New model for endtable PZTs-MEDM Screens setup |
I |
|
|
8957
|
Thu Aug 1 21:28:09 2013 |
gautam | Update | CDS | Slow channels set-up in ALS | The following
slow channels have been added and are now |
|
|
8966
|
Mon Aug 5 18:18:32 2013 |
gautam | Update | CDS | Choosing LO Amplitudes and Frequencies | In
order to decide what frequencies to dither
the 4 degrees of freedom (M1-pitch&yaw, |
|
|
8967
|
Mon Aug 5 18:48:44 2013 |
gautam | Configuration | endtable upgrade | Full range calibration of PZT mounted mirrors for Y-endtable | I
had prepared two more PZT mounted mirrors
for the Y-end some time back. These are: |
|
|
8972
|
Tue Aug 6 16:36:51 2013 |
gautam | Update | CDS | Choosing LO Amplitudes and Frequencies-revised | I redid
the power spectrum measurement for the X-arm
green transmission after aligning the arm |
|
|
8983
|
Wed Aug 7 23:40:49 2013 |
gautam | Update | CDS | X-End Green ASS - A first update | I
have done some preliminary testing of the
X-End Green ASS Servo. I will write a more |
|
|
8993
|
Sat Aug 10 05:53:51 2013 |
gautam | Update | CDS | X-End Green ASS - Roundup | Over
the last three days, I've had the interferometer
to test and optimize the ASX Servo. Based |
|
|
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 |
|
|
11613
|
Thu Sep 17 17:27:01 2015 |
gautam | Update | LSC | RF micky mouse - dodgy DIN connector blocks fixed | [Steve, gautam]
We fixed the problematic DIN connectors
on 1Y2, by swapping out the 3 DIN connector |
|
|
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 |
|
11647
|
Tue Sep 29 03:14:04 2015 |
gautam | Update | CDS | Frequency divider box | Earlier today, the front panels for the
1U chassis I obtained to house the Wenzel
dividers + RF amplifiers arrived, which meant |
|
|
11650
|
Tue Sep 29 19:38:09 2015 |
gautam | Update | General | FOL fiber box revamp | The new 2x2 fiber couplers arrived today
so Eric gave me an overview on the changes
to be made to the existing configuration |
|
|
11652
|
Wed Sep 30 13:07:13 2015 |
gautam | Update | General | FOL fiber box revamp | Eric pointed out that the 1x2 couplers
that were used in the previous arrangement
and which I recycled, were in fact NOT |
|
|
11670
|
Tue Oct 6 16:56:40 2015 |
gautam | Update | General | FOL fiber box revamp | [gautam, ericq]
We had a look at the IR beat (PSL+Xarm)
today using the new FOL fiber box, and compared |
|
|
11683
|
Fri Oct 9 19:54:58 2015 |
gautam | Update | CDS | Frequency divider box - installation in 1X2 rack | The new ZKL-1R5 RF amplifier that Steve
ordered arrived yesterday. I installed this
in the frequency divider box and did a quick |
|
|
11684
|
Mon Oct 12 17:04:02 2015 |
gautam | Update | CDS | Frequency divider box - further tests | I carried out some more tests on the digital
frequency counting system today, mainly to
see if the actual performance mirrors the |
|
|
11690
|
Wed Oct 14 17:40:50 2015 |
gautam | Update | CDS | Frequency divider box - further tests | Summary:
I carried out some further diagnostics
and found some ways in which I could optimize |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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, |
|
|
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 |
|
|
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: |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
11743
|
Mon Nov 9 16:58:59 2015 |
gautam | Update | LSC | FSR and linewidth measurements with phase tracker |
|
|
|
11745
|
Tue Nov 10 02:34:28 2015 |
gautam | Update | LSC | Updated interpretation of peaks | After thinking about the interpretation
of the various peaks seen in the scan through
2 FSRs, I have revised the information presented |
|
|
11750
|
Tue Nov 10 19:25:42 2015 |
gautam | Update | General | FS725 Rubidium reference | In the last few days, with Koji's help,
I have recovered both the FS725 Rubidium
references from W. Bridge, one from |
|
|
11751
|
Wed Nov 11 11:41:42 2015 |
gautam | Update | General | Long cable laid out for 1pps signal | In order to synchronise the FS725 Rb clock
with our GPS timing signals, I laid out a
longish cable running from 1X7 to the |
|
|
11761
|
Fri Nov 13 15:48:16 2015 |
gautam | Update | LSC | Phase tracker calibration using Rubidium standard | [yutaro, gautam]
|
6x |
|
11762
|
Fri Nov 13 17:33:39 2015 |
gautam | Update | LSC | g-factor measurements |
|
|