| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
2951
|
Wed May 19 14:36:46 2010 |
Aidan | HowTo | Phase Camera | Phase Camera algorithm and stuff | I had a think about the algorithm
we might use for the phase camera measurement.
MATLAB has an fft function that will allow |
|
|
2955
|
Thu May 20 10:06:56 2010 |
Aidan | HowTo | Phase Camera | Phase Camera- raw data video | |
|
|
2995
|
Wed May 26 18:54:55 2010 |
Aidan | Summary | Green Locking | Mounted Crystal 724 in the Doubling Oven | Andri and I mounted the Raicol Crystal
#724 in one of the new Covesion Ovens. The
procedure was the same as before - see |
|
|
2998
|
Thu May 27 08:22:57 2010 |
Aidan | Update | Computers | Restarted the elog this morning | |
|
|
3082
|
Wed Jun 16 18:14:13 2010 |
Aidan | Update | General | Glass cover from overhead light smashed on PSL table | I was giving a tour of the 40m yesterday.
We were looking at the PSL table. About 30
seconds after I turned the lights on a glass |
|
|
3113
|
Thu Jun 24 06:49:29 2010 |
Aidan | Update | Green Locking | a channel for PPKTP temperature | Is this a setpoint temperature that we
can change by writing to the channel or is
it a readout of the actual temperature of |
|
|
3421
|
Fri Aug 13 15:29:35 2010 |
Aidan | Frogs | Photos | Here's the 40m team | |
|
|
3756
|
Thu Oct 21 19:10:39 2010 |
Aidan | Update | PSL | Found the beat at 1064nm | |
|
|
3766
|
Fri Oct 22 21:28:27 2010 |
Aidan | Update | Locking | Green era: found a green beat note finally | Nice work!
|
|
|
3907
|
Fri Nov 12 11:36:06 2010 |
Aidan | Configuration | Computers | Fixed the PERL PATH errors from the scripts directory change | I've been trying to get a PID loop
running for the green locking and I've discovered
that some of the directories in the path |
|
|
3908
|
Fri Nov 12 12:06:11 2010 |
Aidan | Configuration | Green Locking | PID script working - now it needs to be tuned | I've set up a PID script that senses
the EX-PSL Green Beat note (from the frequency
counter) and actuates on the temperature |
|
|
3922
|
Mon Nov 15 14:42:01 2010 |
Aidan | Update | PSL | C1PSL rebooted? | Yeah. Joe and I rebooted c1psl a couple
of times this morning. I didn't realize the
burtrestore wasn't automatic. |
|
|
3930
|
Tue Nov 16 09:02:54 2010 |
Aidan | Update | Green Locking | PID loop - calibration of SR620 output | [Aidan, Kiwamu]
Kiwamu and I roughly calibrated the
analogue output from the SR620 frequency |
|
|
3931
|
Tue Nov 16 10:47:45 2010 |
Aidan | Update | Green Locking | Rebooted c1psl - added new GRNBEAT_FREQ channel | I restored C1:PSL-126MOPA_126MON to its
original settings (EGUF = -410, EGUL = 410)
and added a new calc channel called C1:LSC-EX_GRNBEAT_FREQ |
|
|
3932
|
Tue Nov 16 12:47:30 2010 |
Aidan | Update | Green Locking | PID loop but no green | The PID loop is ready to be run on the
green beat note but, since the tanks are
open, there is no green transmission from |
|
|
3934
|
Tue Nov 16 16:00:26 2010 |
Aidan | Update | Green Locking | PID loop but no green |
|
|
|
4040
|
Fri Dec 10 09:58:57 2010 |
Aidan | Update | SUS | beam pointing has been done | Good news. I feel multi-chromatic-locking
success is just around the corner.
By the way, there's a new presentation |
|
|
4177
|
Thu Jan 20 15:39:59 2011 |
Aidan | Update | Locking | Upper limit on frequency noise of ADC | [Aidan, Kiwamu]
Kiwamu and I plugged the output from
a DS3456 function generator into the ADC |
|
|
4178
|
Thu Jan 20 17:00:39 2011 |
Aidan | Configuration | Locking | Ballpark figures for Green Locking PLLs (Digital vs Analogue) | If we use a digital PLL for locking the
frequency of the PSL and END green lasers
then we can expect a UGF of around 1kHz (assuming |
|
|
4182
|
Fri Jan 21 11:45:01 2011 |
Aidan | Configuration | Locking | Ballpark figures for Green Locking PLLs (Digital vs Analogue) |
|
|
|
4205
|
Wed Jan 26 10:11:47 2011 |
Aidan | Update | Green Locking | cavity scan |
|
|
|
4209
|
Wed Jan 26 14:49:48 2011 |
Aidan | Update | Environment | Turned on Control room AC | 80 degrees is too uncomfortable in the
control room so I turned on the AC. The set
point is 74F. |
|
|
4217
|
Fri Jan 28 09:03:38 2011 |
Aidan | Summary | Green Locking | Digital Frequency Discriminator |
|
|
|
4227
|
Sun Jan 30 17:15:09 2011 |
Aidan | Summary | Green Locking | Digital Frequency discriminator - frequency noise | I've had a go at trying to estimate the
frequency noise of the digital frequency
discriminator (DFD). I input a 234.5Hz (0.5Vpp) |
|
|
4229
|
Mon Jan 31 07:03:59 2011 |
Aidan | Summary | Green Locking | DFD - noise spectra |
|
|
|
4230
|
Mon Jan 31 07:41:23 2011 |
Aidan | Update | Green Locking | DFD - medm screen | I added an MEDM screen for the DFD to the
GREEN screen. It is displayed in the attached
screen shot. |
|
|
4234
|
Mon Jan 31 18:25:25 2011 |
Aidan | Update | Green Locking | DFD - results from the new filters (and running with AWG) |
|
|
|
4245
|
Thu Feb 3 16:08:06 2011 |
Aidan | Update | Computer Scripts / Programs | RCG VCO frequency error | Joe and I were looking at the RCG VCO algorithm
to determine if we could adapt it to run
at a faster rate (you can currently change |
|
|
4259
|
Tue Feb 8 10:23:02 2011 |
Aidan | Summary | Green Locking | Digital Frequency Discriminator - reference |
Here's the reference for the self-reference
frequency detection idea. See Figure 2. |
|
|
4260
|
Tue Feb 8 13:26:11 2011 |
Aidan | Summary | Green Locking | Temperature dependence of phase change of green on reflection | I did a quick back of the envelope
calculation of the expected green phase change
on reflection from the aLIGO ITM. |
|
|
4271
|
Thu Feb 10 14:52:36 2011 |
Aidan | HowTo | Computers | Adding filenames in MATLAB plots | The following code is incredibly useful
when creating MATLAB plots as it adds
the filename of the script to the plot itself. |
|
|
4351
|
Thu Feb 24 17:42:00 2011 |
Aidan | Update | Green Locking | 15% of end laser sideband power transmitted through cavity | I did a quick calculation to determine
the amount of sideband transmission through
the FP cavity. |
|
|
4362
|
Sun Feb 27 09:43:59 2011 |
Aidan | Update | Green Locking | sidebands on beatnote | Can we set up a fiber-PD on the end table
to look at the beat between the "end
laser IR beam" and the "PSL IR |
|
|
4365
|
Tue Mar 1 08:42:18 2011 |
Aidan | Update | elog | Restarted the elog this morning | The elog was dead this morning.
I reanimated it. It is now undead. |
|
|
4368
|
Wed Mar 2 17:19:58 2011 |
Aidan | Configuration | Green Locking | Moved PDH PD on end table | As previously noted, there are multiple
beams coming back from the ETM surface onto
the PDH PD on the end table. They are spread |
|
|
4369
|
Wed Mar 2 18:08:43 2011 |
Aidan | Update | Green Locking | Ghost beams on green | Kiwamu and I noticed that there is a ghost
beam on the green beam going into the ETM.
What we see is some interference fringes |
|
|
4428
|
Wed Mar 23 08:50:36 2011 |
Aidan | Update | Green Locking | servo handig off | Nicely done!
|
|
|
4435
|
Wed Mar 23 19:16:17 2011 |
Aidan | Summary | Green Locking | Y-END green equipment is all available | With the exception of a 2" mirror
mount, I've confirmed that we have everything
for the Y-end green production and mode-matching. |
|
|
4443
|
Fri Mar 25 08:58:38 2011 |
Aidan | Update | Treasure | Cleared stuff off SP table | I tidied up some of the stuff that was
on the SP table. The ISS box that has been
sitting on there for months is now underneath |
|
|
4460
|
Wed Mar 30 16:32:29 2011 |
Aidan | Configuration | Computer Scripts / Programs | Added a sitemap alias | I added an alias to the sitemap MEDM screen
in /cvs/cds/caltech/target/cshrc.40m
Now you can enjoy launching sitemap |
|
|
4479
|
Thu Mar 31 20:37:10 2011 |
Aidan | Summary | Green Locking | RF amplitude source | I gutted one of the $2 red laser
pointers to build a laser source whose amplitude
we could modulate at RF frequencies. Basically, |
|
|
4480
|
Thu Mar 31 20:46:11 2011 |
Aidan | Summary | Green Locking | Green beat note PD DC response | I measured the DC response of the Green
PD
|
|
|
4494
|
Wed Apr 6 19:36:32 2011 |
Aidan | Summary | Green Locking | (In)sanity check of Green PD - some inconsistencies | I moved the Hartmut Green PD to the Jenne
laser bench to try to determine if the response
at RF was reasonable or somehow very much |
|
|
4500
|
Thu Apr 7 16:09:17 2011 |
Aidan | Summary | Green Locking | (In)sanity check of Green PD - some inconsistencies | I think I had underestimated the responsivity
of the Silicon PD at 1064nm. The previous
value was based on a rough search online |
|
|
4502
|
Thu Apr 7 21:58:57 2011 |
Aidan | Summary | Green Locking | Beat note amplitude | Having convinced myself that the green
Hartmut PD is giving an acceptable response
at RF frequencies I decided to double-check |
|
|
4575
|
Wed Apr 27 20:14:16 2011 |
Aidan | Summary | elog | Restarted with script ... | |
|
|
4584
|
Thu Apr 28 22:38:38 2011 |
Aidan | Update | Green Locking | Electronics schematic for vertex beatbox | With some assistance from Kiwamu
and Koji, I've drawn up the electronics design
for the Beat Box for the vertex green locking. |
|
|
4741
|
Wed May 18 18:33:46 2011 |
Aidan | Update | elog | restarted elog with script | |
|
|
6162
|
Tue Jan 3 18:40:08 2012 |
Aidan | Summary | Computer Scripts / Programs | medm directory clean-up | I moved the following old and obsolete
MEDM directories to an archive /cvs/cds/rtcds/caltech/c1/medm
c1vga
c1vgl
|
|
|
7495
|
Sun Oct 7 12:11:00 2012 |
Aidan | Update | Computers | Rebooted cymac0 | I rebooted cymac0 a couple of times. When
I first got here it was just frozen. I rebooted
it and then ran a model (x1ios). The machine |
|