| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
12139
|
Fri May 27 11:54:22 2016 |
Varun | Update | General | Package delivery | A package labelled 'UPS Ground'
has arrived.
-Varun |
|
|
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 |
|
|
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 |
|
|
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!
|
|
|
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 |
|
|
12134
|
Wed May 25 11:51:40 2016 |
Steve | Update | safety | SURF 2016 safety |
|
|
|
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
|
|
|
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 |
|
|
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 |
|
|
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 |
|
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. |
|
|
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 |
|
|
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. |
|
|
12126
|
Mon May 23 15:51:32 2016 |
steve | Summary | SUS | oplev laser summary updated |
|
|
|
12125
|
Mon May 23 10:55:49 2016 |
steve | Summary | SUS | ITMX oplev laser replaced |
May 23, 2016 |
|
|
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, |
|
|
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. |
|
|
12122
|
Thu May 19 16:29:20 2016 |
Steve | Update | endtable upgrade | Optical layout almost complete |
|
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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 |
|
|
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
|
|
|
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, |
|
|
12115
|
Wed May 11 16:39:01 2016 |
ericq | Update | VAC | c0rga alive, output wonky |
|
|
|
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. |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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.
|
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
12104
|
Mon May 2 19:14:18 2016 |
gautam | Update | endtable upgrade | Optical layout almost complete | With Steve's help, I installed the
Oplev earlier today. I adjusted the positions
of the two lenses until I deemed the spot |
|
|
12103
|
Mon May 2 17:11:55 2016 |
rana | Update | COC | RC folding mirrors | Antonio/Gautam
are now developing a more up to date Finesse
model of our recycling cavities to see what |
|
|
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 |
|
|
12101
|
Fri Apr 29 16:13:36 2016 |
ericq | Update | LSC | Green PDH demod lowpass | We can get
as much, if not more, attenuation of the
1F line in the mixer output that we get from |
|
|
12100
|
Fri Apr 29 16:05:23 2016 |
gautam | Update | endtable upgrade | Cleaning ETMX vacuum dirty window | After a second round of F.C. application,
I think the window is clean enough and there
are no residual F.C. pieces anywhere near |
|
|
12099
|
Fri Apr 29 00:55:46 2016 |
gautam | Update | endtable upgrade | green PDH locked to Xarm | Using the modulation frequency suggested
here,
I hooked up the PDH setup at the X-end and |
|
|
12098
|
Thu Apr 28 18:53:05 2016 |
rana | Update | LSC | Green PDH demod lowpass | OK - but give us a circuit diagram and
the expected before/after loop plots. Got
to make sure we keep the right impedance |
|
|
12097
|
Thu Apr 28 15:23:11 2016 |
ericq | Update | LSC | Green PDH demod lowpass | The 2F product out of the mixer is a natural
concern when demodulating. However, I think
this isn't so big of a deal in our green |
|
|
12096
|
Thu Apr 28 08:49:47 2016 |
Steve | Update | PEM | possible noise sources schedule |
Building:
Campus (see attached Map)
|
|
|
12095
|
Thu Apr 28 00:41:08 2016 |
gautam | Update | endtable upgrade | more progress - Transmon PD installed | The IR Transmon system is almost completely
laid out, only the QPD remains to be installed.
Some notes: |
|
|
12094
|
Wed Apr 27 15:04:47 2016 |
Steve | Update | endtable upgrade | Cleaning ETMX vacuum dirty window | It looks very promising.
|
|
|
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 |
|
|
12092
|
Wed Apr 27 09:45:56 2016 |
rana | Update | SUS | spare SOS tower | Bah, we need ruby slippers for all future
suspensions. Prism with curved backside and
smooth grooves. |
|
|
12091
|
Wed Apr 27 09:05:10 2016 |
Steve | Update | General | AP viewport |
Sad situation |
|
|
12090
|
Tue Apr 26 23:19:42 2016 |
gautam | Update | endtable upgrade | Green aligned to arm - high order mode flashes seen | Attachment #1
Layout as of today. Most of the
green path is done. The Green REFL PD + PZT |
|