ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
13867
|
Fri May 18 19:59:55 2018 |
Jon Richardson | Configuration | Electronics | AUX-PSL PLL Characterization Measurements | Below is analysis of measurements
I had taken of the AUX-PSL PLL using an SR560
as the servo controller (1 Hz single-pole |
 |
14085
|
Thu Jul 19 01:56:25 2018 |
gautam | Summary | VAC | AUX pump shutdown | [koji,
gautam]
Per Steve's instructions, we |
|
13900
|
Thu May 31 02:04:55 2018 |
johannes | Update | PSL | AUX laser state of mind | The AUX laser is down to 5.4 mW output
power |
|
13948
|
Tue Jun 12 03:22:25 2018 |
gautam | Update | LSC | AUX laser shuttered | I worked a bit on recovering the DRMI locking
again tonight. I decided to shutter the AUX
laser on the PSL table at least until I figured |
|
14501
|
Fri Mar 29 15:47:58 2019 |
gautam | Update | AUX | AUX laser fiber moved from AS table to PSL table | [anjali, gautam]
To facilitate the 1um MZ frequency
stabilization project, I decided that the |
|
14504
|
Sun Mar 31 18:39:45 2019 |
Anjali | Update | AUX | AUX laser fiber moved from AS table to PSL table |
Attachment #1 shows the schematic
of the experimental setup for the frequency
noise measurement of 1 um laser source. |
  |
13834
|
Fri May 11 18:17:07 2018 |
gautam | Update | DetChar | AUX laser PLL setup | [koji,
gautam]
As discussed at the meeting earlier |
|
14045
|
Sun Jul 8 22:27:25 2018 |
keerthana | Update | | AUX diagram | (Analisa, Keerthana, Sandrine)
So far we tried four different
techniques to scan the AUX laser. They are, |
 |
13987
|
Tue Jun 19 18:56:55 2018 |
Jon | Update | General | AUX beam alignment issues | Not much progress today with the AUX cavity
scans. I've determined there still are
some alignment issues. |
|
13989
|
Wed Jun 20 00:57:04 2018 |
johannes | Update | General | AUX beam alignment issues | We did swap a lens as discussed in elog 13968,
but they both had f=100mm specified, the
difference being one was AR-coated for 1064 |
 |
14013
|
Sun Jun 24 23:13:46 2018 |
johannes | Update | General | AUX beam alignment issues | At some point we want to change the AUX
injection on the AS table to interfere less
with the normal interferometer path, and |
|
13968
|
Thu Jun 14 22:45:05 2018 |
johannes | Update | General | AUX beam SRC alignment | [Jon, Gautam, Johannes]
Jon spent some time trying to align
the AUX beam to the SRC today, I got to the |
|
10299
|
Wed Jul 30 18:09:08 2014 |
Harry | Update | General | AUX and PSL Coupling Telescopes | Purpose
These telescopes will be used to
mode match//couple the dumped SHG light from |
    |
11924
|
Sat Jan 9 00:39:15 2016 |
gautam | Update | LSC | AUX Y Freq Noise re-measured |
|
|
11921
|
Fri Jan 8 14:47:33 2016 |
ericq | Update | LSC | AUX Y Freq Noise measured | Here are some results from measuring the
PSL / AUX Y beat.
With the Y end laser, I was able |
 |
11922
|
Fri Jan 8 20:02:49 2016 |
rana | Update | LSC | AUX Y Freq Noise measured | Unless this is the limit from the way you
guys set up the PLL, it seems like there's
no difference between the two lasers that's |
|
10894
|
Tue Jan 13 13:22:54 2015 |
Jenne | Update | General | AUX Y + PSL beat note at 1064nm: needs work | I'm super excited about this new frequency
readback, but I'm |
|
10895
|
Tue Jan 13 14:01:20 2015 |
manasa | Update | General | AUX Y + PSL beat note at 1064nm: needs work |
|
|
10883
|
Fri Jan 9 14:01:17 2015 |
manasa | Update | General | AUX Y + PSL beat note at 1064nm | I
worked around the PSL table today.
The Y+PSL output from the optical |
|
10893
|
Tue Jan 13 10:28:02 2015 |
manasa | Update | General | AUX Y + PSL beat note at 1064nm |
|
|
11936
|
Tue Jan 19 17:27:58 2016 |
gautam | Update | Green Locking | AUX X power investigations | Last week, Eric and I noticed that the
green transmission levels at the PSL table
seem much lower now than they did a month |
|
10996
|
Tue Feb 10 16:01:21 2015 |
manasa | Update | General | AUX X fiber coupled 72% | Plan
C finally worked. We have
|
|
11894
|
Mon Dec 21 02:29:49 2015 |
ericq | Update | LSC | AUX X RIN measurements | I'll finish up the beat / frequency
noise parts of the diagnosis tomorrow
later, but I've done some investigation |
|
11619
|
Fri Sep 18 11:59:08 2015 |
ericq | Update | LSC | AUX X Laser Current Reverted | Once again, the transmitted X green beam
was showing enormous intensity fluctuations
(50x higher than normal). Last month, I reduced the |
|
11533
|
Thu Aug 27 02:09:14 2015 |
ericq | Update | LSC | AUX X Laser Current Changed | I spent some time tonight chasing down
the cause of huge RIN in the X green PDH
transmitted light, which I had started seeing |
|
13325
|
Thu Sep 21 01:32:00 2017 |
gautam | Update | ALS | AUX X Innolight AM measurement running | [rana,gautam]
We set up a measurement of the
AUX X laser AM today. Some notes: |
   |
11917
|
Thu Jan 7 04:28:39 2016 |
ericq | Update | LSC | AUX X Freq Noise measured | [ericq, Gautam]
Brief summary of tonights work:
Locked Marconi to AUX X |
 |
11919
|
Thu Jan 7 16:52:32 2016 |
ericq | Update | LSC | AUX X Freq Noise measured | Here is some of the promised data. As mentioned,
changing diode current and crystal temperature
didn't have much effect on the frequency |
 |
11920
|
Thu Jan 7 19:04:25 2016 |
Koji | Update | LSC | AUX X Freq Noise measured | The next step is to compare this data with
the same measurement with the PSL and the
AUX laser on the PSL table (or the end Y |
|
11908
|
Tue Jan 5 02:54:38 2016 |
ericq | Update | LSC | AUX X Freq Noise attempt | [ericq, Gautam]
We set out to lock a marconi to
the IR fiber beat of PSL + AUX X to measure |
|
11910
|
Tue Jan 5 13:17:06 2016 |
rana | Update | LSC | AUX X Freq Noise attempt | The problem here is that the MC displacement
noise is leading to large frequency excursions
of the PSL beam. Options |
|
11912
|
Tue Jan 5 16:33:45 2016 |
ericq | Update | LSC | AUX X Freq Noise attempt | Turning on the MCL path (in addition to
the MCL FF we always have on) let me lock
the PLL for multiple seconds, but low frequency |
|
16933
|
Tue Jun 21 14:59:22 2022 |
Cici | Summary | General | AUX Transfer Function Loop Exploration | [Deeksha, Cici]
We learned about the auxillary
laser control loop, and then went into the |
|
17243
|
Tue Nov 8 11:18:39 2022 |
Radhika | Update | AUX | AUX PZT transfer function fitting + filtering | Here I describe efforts to cancel the AUX
laser PZT mechanical resonances from ~200
kHz-400kHz. While these may not be the resonances |
 |
17244
|
Tue Nov 8 16:56:33 2022 |
rana | Update | AUX | AUX PZT transfer function fitting + filtering | This looks really good to me. Rather than
fully invert the plant, what we would like
to do is now design a filter which allow |
|
16152
|
Fri May 21 12:12:11 2021 |
Paco | Update | NoiseBudget | AUX PDH loop identification | [Anchal, Paco]
We went into 40m to identify where
XARM PDH loop control elements are. We didn't |
|
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: |
|
11351
|
Wed Jun 10 03:19:58 2015 |
ericq | Update | LSC | AUX PDH error measured in CDS | Looking over the old noise budget in the
green locking paper, it seems the main technical
noise sources were the AUX PDH error and |
|
13994
|
Thu Jun 21 09:33:02 2018 |
Jon | Update | | AUX Mode Scans of YARM, PRC cavities | [Jon, Keerthana, Sandrina]
Yesterday we carried out preliminary
proof-of-concept measurements using |
 |
10349
|
Thu Aug 7 17:09:53 2014 |
Harry | Update | General | AUX Coupling In Progress | I'm currently in the process of coupling
dumped SHG light from the Y arm end table
into fibers for FOL. |
|
10360
|
Sun Aug 10 00:54:54 2014 |
Harry | Update | General | AUX Couping | The Y End laser dumped SHG light has been
coupled into the yellow fiber that terminates
at the PSL table. |
|
14035
|
Tue Jul 3 11:59:10 2018 |
Jon | Update | AUX | AUX Carrier Scan of Y-Arm Cavity | I made the first successful AUX laser scan
of a 40m cavity last night.
Attachment #1 shows the measured |
 |
3442
|
Thu Aug 19 11:38:48 2010 |
Alastair | Update | Computers | ATF wiki | The ATF wiki page doesn't seem to be working
any more. Does anyone know where this
is held so we can try to get it back online? |
|
3443
|
Thu Aug 19 12:06:07 2010 |
Alastair | Update | Computers | ATF wiki |
|
|
8495
|
Fri Apr 26 10:50:07 2013 |
Annalisa | Update | ABSL | ATF laser on PSL | The ATF NPRO auxiliary laser has been moved
on the PSL table. All the optics for beat
note measurement are in place and alignment |
|
15315
|
Fri May 1 01:49:55 2020 |
gautam | Update | ALS | ASY commissioning | Summary:
It appears that the EY green steering
PZTs have somehow lost their bipolar actuation |
|
15316
|
Fri May 1 22:44:17 2020 |
gautam | Update | ALS | ASY M2 PZT damaged | I went to EY and saw that the HV power
supply was only putting out 50 V and had
hit the current limit of 10 mA (nominally, |
|
15317
|
Sat May 2 02:35:18 2020 |
Koji | Update | ALS | ASY M2 PZT damaged | Yes, we are supposed to have a few spare
PI PZTs. |
|
14716
|
Mon Jul 1 20:27:44 2019 |
gautam | Update | ASC | ASX tuning | Summary:
To practise the dither alignment
servo tuning, I decided to make the ASX system |
 |
9018
|
Fri Aug 16 13:25:50 2013 |
Koji | Update | ASS | ASX model/screen cleaning up | [Koji Manasa]
Yesterday we cleaned up the ASX model
and screens to have more straight forward |
|