| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
11891
|
Thu Dec 17 16:44:03 2015 |
gautam | Update | CDS | ALS Slow control MEDM screen updated |
|
|
|
11896
|
Tue Dec 22 16:23:33 2015 |
gautam | Update | IOO | Input alignment to PMC tweaked | When I came in this afternoon, I saw that
the PZT voltage to the PMC had railed. Following
the usual procedure of turning the servo |
|
|
11898
|
Tue Dec 22 16:44:03 2015 |
gautam | Update | General | FS725 Rubidium reference - REPAIRED |
|
|
|
11906
|
Mon Jan 4 16:09:54 2016 |
gautam | Update | Green Locking | Y end laser (Lightwave) PZT calibration | Summary:
I
redid this measurement and have now determined |
|
|
11907
|
Mon Jan 4 16:45:11 2016 |
gautam | Update | Green Locking | Y-end AUX PDH noise breakdown | Summary:
I've
re-measured the noise breakdown for the Y-end |
|
|
11930
|
Wed Jan 13 18:36:00 2016 |
gautam | Update | LSC | restoration of green beat electronics | In preparation for tonight's work,
I did the following:
On the PSL table: |
|
|
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 |
|
|
11937
|
Tue Jan 19 17:54:39 2016 |
gautam | Update | LSC | ALSX Noise still anomalously high | While carrying out my end-table power investigations,
I decided to take a quick look at the out-of-loop
ALSX noise - see the attached plot. The feature |
|
|
11944
|
Fri Jan 22 11:33:20 2016 |
gautam | Update | Green Locking | AUX-X AM/PM investigations | I was trying to characterize the AM/PM
response of the X end laser. I tried to measure
the AM response first, as follows: |
|
|
11946
|
Fri Jan 22 17:22:06 2016 |
gautam | Update | Green Locking | AUX-X AM/PM investigations | There were a number of directories in /users/OLD/mott/PZT/2NPRO,
I've used the data in Innolight_AM_New.
Also, I am unsure as to what their "calibration" |
|
|
11951
|
Tue Jan 26 17:50:22 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | I attempted to measure the frequency noise
of the extra Lightwave NPRO we have that
is currently sitting on the PSL table. I |
|
|
11953
|
Wed Jan 27 18:19:45 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | After adjusting the alignment of the two
beams onto the PD, I managed to recover a
stronger beatnote of ~ -10dBm. I managed |
|
|
11955
|
Wed Jan 27 23:14:25 2016 |
gautam | Update | PEM | ETMX floor vs table noise |
|
|
|
11956
|
Thu Jan 28 00:29:30 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | Summary of the work done today:
Alignment and other work on
PSL table |
|
|
11958
|
Thu Jan 28 19:10:16 2016 |
gautam | Update | LSC | Status of the green PDH circuits |
|
|
|
11963
|
Sat Jan 30 00:12:22 2016 |
gautam | Update | Green Locking | Innolight laser is 10 years old |
|
|
|
11967
|
Mon Feb 1 15:16:28 2016 |
gautam | Update | Green Locking | Innolight laser is 10 years old | The Innolight laser control unit has a
25 pin D-sub connector on the rear which
is meant to serve as a diagnostics aid, and |
|
|
11969
|
Mon Feb 1 18:11:25 2016 |
gautam | Update | Green Locking | Lightwave frequency noise measurement | Before distrubing the beat setup with the
spare Lightwave laser, I wanted to see if
I could resolve the apparent difference in |
|
|
11970
|
Tue Feb 2 18:35:47 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I've moved the following components
that was a part of Koji's setup from
the PSL table to the SP table so that I may |
|
|
11973
|
Wed Feb 3 23:23:47 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | As Koji pointed out in the previous elog,
the CCD beam profiler was ill suited for
this measurement. Nevertheless, to get a |
|
|
11977
|
Fri Feb 5 00:23:01 2016 |
gautam | Update | Green Locking | Lightwave NPRO moved from PSL table to SP table | I've repeated the measurement for the
x-direction and also did the y-direction,
taking into account Koji's suggestion |
|
|
11978
|
Fri Feb 5 15:02:13 2016 |
gautam | Update | Green Locking | X-end NE cable | [Steve, gautam]
Steve thinks that the X-end Innolight
does not come with the noise-eater option |
|
|
11979
|
Fri Feb 5 16:50:24 2016 |
gautam | Update | Green Locking | First pass at mode-matching | I've done a first pass at trying to
arrive at a mode-matching solution for the
X-end table once we swtich the lasers out. |
|
|
11981
|
Mon Feb 8 15:36:37 2016 |
gautam | Update | Green Locking | Alternative mode-matching scheme | I looked in the optics cabinet to see what
lenses we have available, and re-ran the
mode-matching calculation to see if we could |
|
|
11983
|
Tue Feb 9 11:49:47 2016 |
gautam | Update | Green Locking | Laser swap initiated | Steve pointed me to an old
elog by Zach where he had measured the
waist of the 1W Innolight NPRO. I ran |
|
|
11984
|
Tue Feb 9 19:15:36 2016 |
gautam | Update | Green Locking | Laser swap - updates | Some updates on the laser swap situation:
Mode-matching calculation:
I
should have caught this earlier, but it was |
|
|
11985
|
Wed Feb 10 17:57:15 2016 |
gautam | Update | Green Locking | Laser swap - updates | After the discussion at the meeting, I
decided to go ahead and open the top of the
oven so that I could get a visual on where |
|
|
11988
|
Fri Feb 12 17:05:40 2016 |
gautam | Update | Green Locking | Laser swap - green light recovered but no flashes in the arm | After carefully tweaking the mode-matching
of the IR into the crystal and the four-axis
translation stage on which the doubling oven |
|
|
11990
|
Mon Feb 15 12:28:03 2016 |
gautam | Update | General | Something has gone wrong - was there a power outage? | I came into the 40m a few minutes ago,
and noticed the following (approximately
in this order): |
|
|
11995
|
Tue Feb 16 23:42:22 2016 |
gautam | Update | General | Power Glitch recovery - arms recovered | I was able to realign the arms, lock
them, and have run the dither align to maximize
IR transmission - looks like things are back |
|
|
11999
|
Fri Feb 19 00:42:19 2016 |
gautam | Update | Green Locking | Laser swap - beam ellipticity from laser? | Eric and I spent some time yesterday night
trying to recover the green in the arm after
the laser swap. The problem essentially was |
|
|
12002
|
Mon Feb 22 13:56:52 2016 |
gautam | Update | Green Locking | Laser swap -reflected beam from ETM aligned | I tried aligning the green beam, elliptical
as it is, to the arm by using the various
steering mirrors after the doubling oven. |
|
|
12005
|
Tue Feb 23 17:46:09 2016 |
gautam | Update | SUS | EQ | Looks like another EQ 4.8 took out all
the watchdogs, I've restored them, everything
looks alright and doesn't look like any |
|
|
12006
|
Tue Feb 23 23:01:16 2016 |
gautam | Update | Green Locking | Laser swap - Green PDH locking | Given that we were seeing green flashes
in the arms, I tried to see if I could get
the green locked to the arm in a nice mode. |
|
|
12009
|
Wed Feb 24 19:29:13 2016 |
gautam | Update | Green Locking | Laser swap - Green PDH locked | After the discussion at the meeting today,
I decided to try and lock the green by sweeping
through PZT dither frequencies in the vicinity |
|
|
12011
|
Thu Feb 25 11:32:04 2016 |
gautam | Update | General | Power Glitch again |
|
|
|
12012
|
Fri Feb 26 01:52:44 2016 |
gautam | Update | Green Locking | Laser swap - Green PDH OLTF | I spent some more time today trying to
optimize the modulation frequency and amplitude
for the X end PDH, and the alignment/mode-matching |
|
|
12013
|
Mon Feb 29 17:17:26 2016 |
gautam | Update | Green Locking | Laser swap - still no green beatnote | I continued the hunt for a green beatnote
today - I decided to take the output from
the RF amplifiers sitting on the PSL table |
|
|
12016
|
Wed Mar 2 17:42:19 2016 |
gautam | Update | Green Locking | Laser swap - some progress | [Koji, Johannes, gautam]
With Koji's and Johannes'
help, I managed to resolve the coupling the |
|
|
12017
|
Thu Mar 3 01:25:50 2016 |
gautam | Update | Green Locking | Laser swap - 2 IR + 1 green beatnotes found | [ericq, gautam]
Summary of work done tonight:
The PDH setup at the Y-end |
|
|
12019
|
Fri Mar 4 01:11:41 2016 |
gautam | Update | Green Locking | Laser swap - both green beatnotes found | The good news: both green beatnotes have
now been found. The problem was alignment
on the green beat PD on the PSL table which |
|
|
12023
|
Sat Mar 5 23:31:01 2016 |
gautam | Update | Green Locking | Laser swap - some updates | I've been a little behind on my elogs
so here is an update of the end laser situation.
IR beat for X-end recovered |
|