ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
4470
|
Wed Mar 30 21:21:15 2011 |
Bryan | Configuration | Green Locking | The wonderful world of mode-matching | Step 4: Matching into |
  |
4476
|
Thu Mar 31 14:10:00 2011 |
Bryan | Configuration | Green Locking | The wonderful world of mode-matching |
|
 |
4477
|
Thu Mar 31 15:23:14 2011 |
Bryan | Configuration | Green Locking | The wonderful world of mode-matching |
|
 |
4481
|
Fri Apr 1 18:54:41 2011 |
Bryan | Configuration | Green Locking | Y end doubling oven | The doubling oven is now ready to go for
the Y arm. The PPKTP crystal is mounted in
the oven: |
 |
4485
|
Mon Apr 4 14:20:32 2011 |
Bryan | Configuration | Green Locking | The wonderful world of mode-matching | |
 |
4486
|
Mon Apr 4 18:58:44 2011 |
Bryan | Configuration | Green Locking | A beam of purest green | We now have green light at the Y end.
The set-up (with careful instructions |
|
4495
|
Wed Apr 6 22:13:24 2011 |
Bryan | Configuration | Green Locking | Resonating green light! | Every so often things just work out. You
do the calculations, you put the lenses on
the bench, you manually adjust the pointing |
|
4520
|
Wed Apr 13 16:56:08 2011 |
Bryan | Configuration | Green Locking | Y-ARM Green-Locked! | Locked!
The Y-arm can |
|
4525
|
Thu Apr 14 17:45:59 2011 |
Bryan | Configuration | Green Locking | I leave you with these messages... | OK…
the Y-arm may be locked with green light,
which was the goal, and this is all good |
|
4532
|
Fri Apr 15 13:43:23 2011 |
Bryan | Configuration | Green Locking | I leave you with these messages... | Y-end PDH electronics. |
|
13792
|
Thu Apr 26 18:58:21 2018 |
Bruce | Configuration | ALS | New look EX Fiber coupling - pol stability | |
|
8160
|
Mon Feb 25 20:25:33 2013 |
Brett | Update | SUS | New Global Damping MEDM Screens | Global damping screens are in progress
for the new global damping infrastructure
Jamie discussed in log #8159. The main overview |
|
8161
|
Mon Feb 25 20:49:07 2013 |
Brett | Update | SUS | Minor Mod made to SUS_GLOBAL block | I made a minor modification to install
some output filters in the new global damping
GLOBAL box in c1sus.mdl. These will be needed |
|
8172
|
Tue Feb 26 16:13:18 2013 |
Brett | Update | SUS | ITMY and ETMY mysterious loop gain difference of 2.5 | While doing initial measurements for the
new global damping infrastructure I discovered
that the ETMY loop between the OSEM actuation |
|
8174
|
Tue Feb 26 17:56:15 2013 |
Brett | Update | SUS | Global Damping Update | The global damping input and output matrices
were installed to run for the Y-arm. Since
we are using just one arm for now, only the |
|
8193
|
Wed Feb 27 22:28:53 2013 |
Brett | Update | SUS | Global Damping Update | New excitation points were added
after the global damping loops for more testing
options. The updated c1sus.mdl model was |
|
8207
|
Fri Mar 1 16:37:45 2013 |
Brett | Update | SUS | Global Damping Update | Brett and Kamal
The global damping testing for the
week is now complete. The c1sus.mdl simulink |
 |
8220
|
Mon Mar 4 16:26:45 2013 |
Brett | Update | SUS | Global Damping Noise Measurement | Here is an amplitude spectrum plot of y-arm
cavity noise with a 50 Hz cutoff damping
filter of the form zpk(0,[50;50],1). The |
|
4257
|
Mon Feb 7 19:21:32 2011 |
Beard Papa | Metaphysics | Photos | The Adventures of Dr Stochino and Beard Papa | |
|
7730
|
Tue Nov 20 02:57:24 2012 |
Ayaka, Den, Koji | Update | Locking | red in arms | We aligned and locked x and y arms.
MCL loop makes arms lock unstable,
adds a lot of noise at frequencies 60-100 |
8x |
7718
|
Fri Nov 16 03:12:39 2012 |
Ayaka, Den | Update | Green Locking | xarm locked | We aligned and locked xarm for green.
|
|
7589
|
Mon Oct 22 20:44:49 2012 |
Ayaka | Update | Adaptive Filtering | microphone noise | I will do some experiments on acoustic
noise canceling during my stay.
Now I am planning to cancel acoustic |
|
7596
|
Tue Oct 23 10:24:42 2012 |
Ayaka | Update | Adaptive Filtering | microphone noise |
|
|
7607
|
Wed Oct 24 14:15:34 2012 |
Ayaka | Update | Adaptive Filtering | microphone noise | Previous results
I am measuring the noise level of
the microphones. The circuit does not seems |
 |
7621
|
Thu Oct 25 09:53:23 2012 |
Ayaka | Update | Adaptive Filtering | microphone noise |
|
|
7633
|
Fri Oct 26 18:25:02 2012 |
Ayaka | Update | Adaptive Filtering | Microphone noise again | [Raji, Ayaka]
Thanks to Den, power supplies for
microphone circuit are changed. |
|
7636
|
Mon Oct 29 08:41:22 2012 |
Ayaka | Update | Adaptive Filtering | Microphone noise again |
|
|
7672
|
Mon Nov 5 20:37:01 2012 |
Ayaka | Update | WienerFiltering | Play with wiener filtering | I am trying to find what limits the
reduction rate with wiener filtering.
I did some calculations below: |
 |
7688
|
Thu Nov 8 10:11:58 2012 |
Ayaka | Update | WienerFiltering | Play with wiener filtering | I will attach a document which describes
how the noise affect the wiener filter and
the noise cancellation ratio. |
  |
7702
|
Tue Nov 13 00:28:10 2012 |
Ayaka | Update | IOO | MC locked, spots centered | [Rana, Ayaka, Jenne]
We aligned the REFL beam to the center
of PD. |
  |
7707
|
Tue Nov 13 21:05:22 2012 |
Ayaka | Update | WienerFiltering | Acoustic noise cancellation with MC | In order to perform acoustic noise
cancellation with MCL signal, I am trying
to find sweet spots for microphones. |
9x |
7733
|
Tue Nov 20 15:24:52 2012 |
Ayaka | Update | PEM | Seismometers and a microphone | I got two seismometers and one microphone
back from Tara.
They are now near the Gurlap under |
|
7738
|
Wed Nov 21 21:06:13 2012 |
Ayaka | Update | LSC | calibration of arms | Motivation
In order to estimate whether we can
see acoustic coupling in arms or not, we |
7x |
7743
|
Mon Nov 26 10:42:06 2012 |
Ayaka | Update | LSC | calibration of arms | I uploaded a zip file that contains data
files used for the calibration.
OLTF_x/y.txt: the open loop transfer |
|
7748
|
Mon Nov 26 23:45:52 2012 |
Ayaka | Update | IOO | Tuning MC_L | [Rana, Jamie, Ayaka]
We could not lock the arms with MC_L
loop on. Therefore we measured the change |
   |
7751
|
Tue Nov 27 01:03:42 2012 |
Ayaka | Update | WienerFiltering | Sound on PSL | Last Thursday, I put the speaker
and my laptop in the PSL table, and make
triangular wave sound with the basic frequency |
   |
7760
|
Wed Nov 28 23:55:13 2012 |
Ayaka | Update | WienerFiltering | Sound on PSL | I have been searching for the way
we can subtract signal better since I could
see the acoustic coupling signal remains |
 |
7762
|
Thu Nov 29 02:43:48 2012 |
Ayaka | Update | PEM | Decreased RMS in Seismometers |
|
  |
7778
|
Mon Dec 3 17:04:12 2012 |
Ayaka | Update | PSL | PMC calibration for MC_F calibration | In order to calibrate MC_F signal, I need
to know the calibration value from thorlab's
PZT driver to laser frequency. |
    |
7784
|
Tue Dec 4 18:53:50 2012 |
Ayaka | Update | Alignment | BS chamber | BS chamber seemed to be kicked again around
10:00 am today.
I moved PZT mainly in YAW and locked |
|
7789
|
Wed Dec 5 01:06:22 2012 |
Ayaka | Update | WienerFiltering | The microphones and the speaker on the AP table | In order to see the acoustic coupling
on arm signals, I set 6 microphones and the
speaker on the AP table. The microphones |
  |
7799
|
Fri Dec 7 20:34:31 2012 |
Ayaka | Update | SUS | oplevs as acoustic and seismic noise couplers at high frequencies | I will
just leave the picture of spectrum that shows
the injected acoustic sound effects due to |
|
7808
|
Tue Dec 11 09:31:47 2012 |
Ayaka | Update | LSC | Oplev update for improving sensitivity | Motivation
We observed that oplev servos affect |
7x |
7809
|
Tue Dec 11 10:09:04 2012 |
Ayaka | HowTo | PEM | cables needs care |
|
|
7812
|
Tue Dec 11 21:53:37 2012 |
Ayaka | Update | LSC | Oplev update for improving sensitivity | [Rana, Ayaka]
The BS oplev pitch feedback came
back. |
 |
7814
|
Wed Dec 12 11:49:05 2012 |
Ayaka | Update | LSC | Acoustic noise in POX and AS error signal | [Koji, Ayaka]
Last night, I injected acoustic noise
at POX table and AS table with oplev controls |
 |
7823
|
Thu Dec 13 17:24:53 2012 |
Ayaka | Update | PSL | PMC calibration for MC_F calibration | I calibrated MC_F signal into Hz/rtHz
unit using the transfer function from
MC_F to PMC feedback signal. |
6x |
7824
|
Thu Dec 13 18:06:59 2012 |
Ayaka | Update | WienerFiltering | New microphone mounts | Yesterday, I made new mounts for
microphones.
|
 |
7829
|
Fri Dec 14 03:32:51 2012 |
Ayaka | Update | LSC | High frequency noise in AS signal | I calibrated the AS error signal into the
displacement of the YARM cavity in the same
way as I did before (elog). |
    |
7830
|
Fri Dec 14 03:49:02 2012 |
Ayaka | Update | General | Earthquake | There was an earthquake around 2:30 am.
Now all the mirrors except SRM are damped.
|
 |