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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.

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