| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
12105
|
Thu May 5 03:05:37 2016 |
gautam | Update | endtable upgrade | ALS status update | [ericQ, gautam]
Today we spent some time looking
into the PDH situation at the X end. A summary |
|
|
12106
|
Thu May 5 04:05:03 2016 |
ericq | Update | LSC | Aux X PDH checks | We took an OLG measurement of the green
PDH loop. It seems consistent with past measurements.
I've added a trace for the the post-mixer |
|
|
12107
|
Thu May 5 14:03:52 2016 |
ericq | Update | LSC | Further Aux X PDH tweaks | This morning I poked around with the green
layout a bit. I found that the iris immediately
preceding the viewport was clipping the ingoing |
|
|
12108
|
Thu May 5 14:05:01 2016 |
rana | Update | endtable upgrade | ALS status update | All seems very fishy. Its not good to put
attenuators and filters in nilly-willy.
Once the post-PD bandpass |
|
|
12109
|
Thu May 5 21:28:44 2016 |
gautam | Update | endtable upgrade | Innolight PZT capacitance | I suggested
in an earlier elog that after the repair |
|
|
12110
|
Fri May 6 16:42:12 2016 |
ericq | Update | LSC | Green PDH demod lowpass | I've build the filter, and it seems
to have the desired TF shape.
|
|
|
12111
|
Fri May 6 19:08:52 2016 |
rana | Update | LSC | Green PDH demod lowpass | Seems weird to design a PD lowpass with
a corner at the modulation frequency. Recall
what our strategy is with the other photodetectors |
|
|
12112
|
Sat May 7 09:40:40 2016 |
ericq | Update | LSC | Green PDH demod lowpass | As I was looking at filter designs, it
seemed difficult to get 40dB of supression
at 2F with a bandpass without going to a |
|
|
12113
|
Sun May 8 08:39:21 2016 |
rana | Update | LSC | Green PDH demod lowpass | Indeed. This is why the LSC PDs have a
2f notch in addition to the 1f resonance.
In recent versions, we also put a 2f notch |
|
|
12114
|
Tue May 10 03:44:59 2016 |
ericq | Update | LSC | Relocked | ALSX noise is solidly within past acceptable
performance levels. The DRFPMI was locked
on four out of six attempts. |
|
|
12115
|
Wed May 11 16:39:01 2016 |
ericq | Update | VAC | c0rga alive, output wonky |
|
|
|
12116
|
Thu May 12 14:29:58 2016 |
gautam | Update | VAC | RGA back up and running | It looks like the hardware reset did the
trick. Previously, I had just tried ssh-ing
into c0rga and rebooting it. At the time, |
|
|
12117
|
Sun May 15 19:48:08 2016 |
Steve | Update | VAC | run out of N2 | 3-4 hrs ago we run out of nitrogen. We
are back to Vacuum Normal
|
|
|
12118
|
Tue May 17 05:50:43 2016 |
Varun Kelkar | Update | General | SURF 2016 | Hello, I am Varun Kelkar. I will be working
at the 40m lab as a SURF student this summer
with Eric Quintero on Audio processing for |
|
|
12119
|
Tue May 17 14:46:51 2016 |
Steve | Update | VAC | RGA scan at day 595 | We have good RGA scan now. There was no
scan for 3 months. |
|
|
12120
|
Wed May 18 01:10:22 2016 |
gautam | Update | COC | Finesse modelling | I've been working on putting together
a Finesse model for the current 40m configuration.
The idea was to see if I could reproduce |
|
|
12121
|
Wed May 18 17:42:52 2016 |
Varun | Update | General | SURF 2016 | Finished writing the code on whitening.
I have to still test it. uploaded on github
noise cancellation repo. @eric could you |
|
|
12122
|
Thu May 19 16:29:20 2016 |
Steve | Update | endtable upgrade | Optical layout almost complete |
|
|
|
12123
|
Fri May 20 00:06:19 2016 |
Varun | Update | General | SURF 2016 | I have written a basic version of AGC,
and have done some tests with a data file.
will do tests on whitening and agc today. |
|
|
12124
|
Fri May 20 17:36:06 2016 |
gautam | Update | LSC | New stands for TransMon/Oplev QPDs | As we realized during the EX table switch,
the transmitted beam height from the arm
is not exactly 4" relative to the endtable, |
|
|
12127
|
Mon May 23 17:47:51 2016 |
Varun | Update | General | SURF 2016 | Tested the AGC today with LSC cavity transmission
signal and error signal. Not in real time
still. |
|
|
12129
|
Tue May 24 17:55:17 2016 |
Varun | Update | Electronics | Using Altium | Contacted Charles regarding use of Altium.
Got to know that Altium is installed
on cit40m iMac in Win7 on VirtualBox. |
|
|
12130
|
Tue May 24 22:49:02 2016 |
gautam | Update | COC | Finesse modelling - mode overlap scans | Summary:
Having played around with a toy finesse
model, I went about setting up a model in |
9x |
|
12131
|
Tue May 24 23:17:37 2016 |
ericq | Update | COC | Finesse modelling - mode overlap scans | I think you should use the current actual
PRC & SRC cavity lengths as measured,
as it would be simplest to simply replace |
|
|
12132
|
Wed May 25 02:54:09 2016 |
ericq | Update | General | Odds and ends | WFS locking point seemed degraded; I hand
aligned and reset the WFS offsets as usual.
ITMX oplev recentered. While doing |
|
|
12133
|
Wed May 25 08:32:55 2016 |
Steve | Update | SUS | local EQ 3.5m | Local EQ 3.5 mag at 2:28 UTC May
24, 2016 Rancho Cucamonga, Ca.....no damage
|
|
|
12134
|
Wed May 25 11:51:40 2016 |
Steve | Update | safety | SURF 2016 safety |
|
|
|
12135
|
Wed May 25 14:21:29 2016 |
Max Isi | Update | General | Summary page configuration | I have modified the c1summary.ini and c1lsc.ini
configuration files slightly to avoid overloading
the system and remove the errors that were |
|
|
12136
|
Wed May 25 14:29:31 2016 |
Varun | Update | General | SURF 2016 | Edited the AGC to include overlapping frames
yesterday. forgot to put an elog on it!
|
|
|
12137
|
Thu May 26 18:10:48 2016 |
Varun | Update | General | SURF 2016 | Wrote and tested a function for downconversion.
It contains a mixer with a sinusoidal input
for modulation with the desired frequency |
|
|
12138
|
Fri May 27 02:52:53 2016 |
ericq | Update | LSC | Restoring high BW single arm control | I've been futzing with the common mode
servo, trying to engage the AO path with
POY for high bandwidth control of a single |
|
|
12139
|
Fri May 27 11:54:22 2016 |
Varun | Update | General | Package delivery | A package labelled 'UPS Ground'
has arrived.
-Varun |
|
|
12140
|
Mon May 30 18:19:50 2016 |
Johannes | Update | CDS | ASS medm screen update | I noticed that the TRY button in the ASS
main screen was linking to LSC_TRX instead
of LSC_TRY. Gautam fixed it. |
|
|
12141
|
Tue May 31 16:52:58 2016 |
Steve | Update | safety | NONO | Please do not place anything on the top
of the cabinets that is not tied down. It
will end up on our head in an earth quake. |
|
|
12142
|
Wed Jun 1 09:06:38 2016 |
Steve | Update | LSC | New stands for TransMon/Oplev QPDs | Machined from I-beam 6061 T6 Aluminum 5"
x 0.5 x 3.25
|
|
|
12143
|
Wed Jun 1 11:19:14 2016 |
Varun | Update | General | Update of work till now | Completed:
Wrote and tested a code for AGC
using cavity transmission signal and length |
|
|
12144
|
Wed Jun 1 15:01:56 2016 |
Steve | Update | SUS | wire standoffs update | There are some issues with 5 mm sapphire
prism Atm5. It will cause interference
between one of the prisms and the Side OSEM. |
|
|
12145
|
Wed Jun 1 16:28:28 2016 |
ericq | Update | Electronics | Common board Op amp input offsets | I used a Eurocard extension board to peek
at the inputs and outputs of each of the
gain-ladder AD829s on input B of the CM board |
|
|
12146
|
Thu Jun 2 16:35:44 2016 |
Koji | Update | SUS | wire standoffs update | Gap of the prism from the mirror
Sag: s = R(1-Cos[ArcSin[d/2/R]])
- Mirror curvature sag for 2mm |
|
|
12147
|
Fri Jun 3 12:53:44 2016 |
ericq | Update | Electronics | Common board Op amp input offsets | I replaced some of the AD829s with other
AD829s, but the offset situation didn't
improve. |
|
|
12148
|
Fri Jun 3 13:05:18 2016 |
ericq | Update | CDS | CDS Notes | Some CDS related things:
Keith Thorne has told us
about a potential fix for our framebuilder woes. |
|
|
12149
|
Fri Jun 3 14:24:13 2016 |
Steve | Update | SUS | local EQ 3.1 m | Local EQ 3.1 mag at Jun 2, 2016 11:06:16
PM UTC, Muscoy CA........no damage
Our STS should seen this shake. |
|
|
12150
|
Fri Jun 3 17:56:14 2016 |
Varun | Update | General | DAFI update | Wrote and tested a phase vocoder, with
two of its applications:
1) Time scaling: This enables change |
|
|
12151
|
Mon Jun 6 16:41:36 2016 |
ericq | Update | CDS | FB upgrade work | Barring objections, starting tomorrow morning, Jamie
will be testing the new FB code. The IFO
will not be available for other use while |
|
|
12152
|
Tue Jun 7 11:12:47 2016 |
jamie | Update | CDS | DAQD UPGRADE WORK UNDERWAY | I
am re-starting work on the daqd upgrade again
now. Expect the daqd |
|
|
12153
|
Tue Jun 7 17:21:13 2016 |
Aakash | Update | General | SURF 2016 | Hi!
I am Aakash Patil. I will be working
at the 40m lab as a SURF student with Gautam |
|
|
12154
|
Tue Jun 7 18:20:18 2016 |
Varun | Update | General | DAFI update | Tried to implement AGC on FE. Had some
trouble bringing the code into the correct
form. It looks okay now. However, this agc |
|
|
12155
|
Tue Jun 7 20:49:50 2016 |
jamie | Update | CDS | DAQD work ongoing | Summary: new daqd code
running overnight test on fb1. Stability
issues persist. |
|
|
12156
|
Wed Jun 8 08:34:55 2016 |
jamie | Update | CDS | DAQD work ongoing | 38 restarts overnight. Problem definitely
not fixed. I'll be reverting back
to old daqd and fb this morning. Then |
|
|
12157
|
Wed Jun 8 10:20:14 2016 |
Steve | Update | safety | SURF 2016 safety | Aakash Patil received 40m specific basic
safety training.
|
|