| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
|
11767
|
Mon Nov 16 16:18:34 2015 |
gautam | Update | General | water leak along Y-arm? | A Caltech maintenance staff dropped by
at around noon today, and told me that he
had seen a small puddle of water on the other |
|
|
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 |
|
|
11833
|
Tue Dec 1 17:16:31 2015 |
gautam | Update | CDS | Script for copying BLRMS filters | We've been talking about putting in
BLRMS filters for several channels - it would
be a pain to manually copy over the correct |
|
|
11840
|
Wed Dec 2 18:54:20 2015 |
gautam | Update | CDS | Changes to C1MCS, C1PEM | Summary:
I've
made several changes to the C1MCS model and |
|
|
11841
|
Thu Dec 3 03:01:07 2015 |
gautam | Update | LSC | Calibration of C1CAL | [ericq, gautam]
While trying to resolve the strange
SRCL loop shape seen yesterday (which has |
|
|
11844
|
Thu Dec 3 18:18:48 2015 |
gautam | Update | CDS | BLRMS for optics suspensions - library block | In order to be consistent with the naming
conventions for the new BLRMS filters, I
made a library block that takes all the input |
|
|
11849
|
Fri Dec 4 18:20:36 2015 |
gautam | Update | CDS | BLRMS for IMC setup | [ericq, gautam]
BLRMS filters
have been set up for the coil outputs and |
|
|
11865
|
Tue Dec 8 23:24:08 2015 |
gautam | Update | Green Locking | Y end laser (Lightwave) PZT calibration | Summary:
I
measured the PZT actuator gain for the Lightwave |
|
|
11877
|
Sun Dec 13 21:55:28 2015 |
gautam | Update | Green Locking | Y end laser (Lightwave) PZT calibration | Summary:
After
the discussions at the Wednesday meeting, |
|
|
11879
|
Mon Dec 14 16:27:11 2015 |
gautam | Update | Green Locking | Y-end AUX PDH noise breakdown | Summary:
I've
attached the results from my measurements |
|
|
11883
|
Tue Dec 15 11:22:53 2015 |
gautam | Update | CDS | c1scx and c1asx crashed | I noticed what I thought was excessive
movement of the beam spot on ITMX and
ETMX on the control room monitors, and when |
|
|
11886
|
Wed Dec 16 10:56:22 2015 |
gautam | Update | CDS | hard reboot of FB | [ericq,gautam]
Forgot to submit this yesterday...
While we were trying to get the |
|
|
11887
|
Wed Dec 16 18:34:40 2015 |
gautam | Update | Green Locking | Green beat channels temporarily set up as IR beat channels | Since there
are a few hours to go before the locking
efforts tonight, I've temporarily borrowed |
|
|
11890
|
Thu Dec 17 14:02:05 2015 |
gautam | Update | CDS | IPC channels for beat frequency control set up | I've set up two IPC channels that take
the output from the digital frequency counters
and send them to the end front-ends (via |
|