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ID Date Author Type Category Subject Text   9507   Fri Dec 20 22:45:02 2013 Koji Update LSC high bandwidth loop achieved for yarm I checked the offset situation in the CM servo boost circuit.  - The offset voltage on the CM servo      9509   Sat Dec 21 01:54:04 2013 Koji Configuration LSC LSC Whitening for the DCPDs/CM servo replaced The previous LSC whitening filters for the DCPDs were in an unknown state (although the transfer functions were actually measured      9523   Mon Jan 6 22:11:46 2014 Jenne Update LSC PRCL sideband locking still not so happy    The PRCL once again doesn't want to lock on sidebands for me.  I      9537   Wed Jan 8 13:01:48 2014 Gabriele Summary LSC Effect of PRC length mismatch on error signals I ran a simulation of a double cavity with a PRC length mismatched w.r.t. the modulation      9539   Wed Jan 8 16:08:52 2014 ericq Summary LSC Effect of PRC length mismatch on error signals  [ericq,Gabriele] So, we want an relatively quick measurement of the PRC length error (with sign!) at the      9541   Wed Jan 8 19:05:30 2014 Gabriele Summary LSC Effect of PRC length mismatch on error signals  [Gabriele, EricQ]        9544   Thu Jan 9 17:58:31 2014 ericq Summary LSC Effect of PRC length mismatch on error signals [ericq, Gabriele, Manasa]  We wanted to perform the PRC length measurement today with an AS11 signal,      9546   Fri Jan 10 15:31:07 2014 rana Summary LSC Effect of PRC length mismatch on error signals    Its very doubtful that the MC yaw drift matters for the IFO. That's      9548   Sun Jan 12 09:57:24 2014 Gabriele Summary LSC Effect of PRC length mismatch on error signals                                9551   Mon Jan 13 19:31:04 2014 Gabriele Summary LSC PRMI locking [Gabriele, EricQ] We wanted to try the PRC length measurement,but we ended up spending all the afternoon to      9554   Tue Jan 14 19:05:48 2014 Gabriele Summary LSC PRMI locked on sideband [Gabriele, EricQ]  Finally, we managed to lock PRMI on sidebands:      9555   Tue Jan 14 19:10:51 2014 Gabriele Summary LSC PRC length measurement  [EricQ, Gabriele] We could carry out the measurement of PRC length. The AS110 photodiode was plugged      9557   Wed Jan 15 18:18:15 2014 Gabriele Summary LSC PRC length measurement analysis  I analyzed the data we took yesterday, both using AS11 and AS55. For each value of the phase I estimated the Q/P ratio using      9560   Thu Jan 16 21:38:13 2014 ericq Update LSC Repeat of PRC length measurement [ericq,Jenne] Since we don't have agreement between the measurements we made the other day and      9561   Fri Jan 17 11:44:25 2014 Gabriele Summary LSC More length measurements, more confusion  I analyzed the data taken yesterday.  The AS11 data in PRMI configuration is very bad, while the AS55 seems good enough:      9564   Wed Jan 22 09:05:42 2014 Gabriele Configuration LSC REFL11 back  Yesterday night I plugged back the REFL11 RF cable into the corresponding demodulation board.      9573   Fri Jan 24 12:44:25 2014 Gabriele HowTo LSC Procedure to measure PRC length Here is how to measure the PRC length with a set of distance measurements in the optical setup.   8x    9574   Fri Jan 24 13:10:12 2014 Jamie HowTo LSC Procedure to measure PRC length                                9575   Sat Jan 25 21:09:16 2014 gabriele HowTo LSC Procedure to measure PRC length I know the drawing is wrong. I put random distances, not realistic ones, and I did not try to get something close      9586   Wed Jan 29 21:01:03 2014 Gabriele Summary LSC PRC length measurement analysis  [Manasa, EricQ, Gabriele] We      9588   Thu Jan 30 19:00:25 2014 Gabriele Summary LSC PRC length changed  [Manasa, EricQ, Gabriele] Today      9590   Fri Jan 31 19:29:36 2014 Gabriele Summary LSC PRC and SRC lengths  Today we measured the missing distance to reconstruct SRC length. I also changed the way the mirror      9606   Wed Feb 5 20:41:57 2014 Den Update LSC calibrated spetra from OAF test We did online adaptive filtering test with IMC and arms 1 year ago (log 7771). In the 40m presentations I can      9614   Sat Feb 8 15:14:18 2014 ericq Update LSC PRM Sideband Splitting [ericq] Today, I kicked the PRM to see the sideband splitting in POP110.       9626   Wed Feb 12 11:57:55 2014 Jenne Update LSC Musings on RFPDs [Rana, Jenne, Manasa] We looked at the I vs. Q separation in several of the Refl PDs, while driving      9630   Wed Feb 12 19:47:40 2014 Jenne Update LSC Calibrated REFL signals I calibrated the REFL signals to meters from counts.  The I-phase signals all line up very nicely, but the Q-phase signals      9631   Wed Feb 12 20:30:41 2014 Koji Update LSC Calibrated REFL signals We usually want to remove PRCL from the Q quadrature for each PD.  Therefore, you are not supposed to      9634   Thu Feb 13 19:36:36 2014 Koji Summary LSC PRM 2nd/4th violin filter added Jenne and I noticed high pitch sound from our acoustic interferometer noise diagnostic system.      9635   Thu Feb 13 22:27:54 2014 Jenne Update LSC PRMI locked on REFL 33 I&Q [Jenne, Koji] I was able to get the PRMI locked on REFL33 I&Q, but it wasn't overly stable,      9636   Fri Feb 14 00:58:41 2014 Jenne Update LSC Thoughts on Transition to IR [Koji, Jenne, EricQ, Manasa] We      9641   Sun Feb 16 17:40:11 2014 Koji Update LSC Friday Night ALS I wanted to try common/differential ALS Friday evening. I tried ALS using the LSC servo but this was not successfull.      9646   Tue Feb 18 18:52:08 2014 Jenne Update LSC ALS not locking with LSC Koji mentioned to me (and elogged) that he was unsuccessful locking the ALS using the LSC servos.  He suggested I look      9647   Tue Feb 18 20:31:29 2014 Koji Update LSC ALS not locking with LSC Hmm. Wierd. Can you look at the TFs between ETMX-EXC and the error signals so that we can identify which one has these structures.      9648   Tue Feb 18 23:27:14 2014 Jenne Update LSC ALS not locking with LSC It looks like its somehow a discrepancy between the TFs of each error signal, because features are similar, and present, in both      9649   Tue Feb 18 23:55:33 2014 Jenne Update LSC ALS locked with LSC! I'm really excited, so I'm posting this, even though I'm still working:      9650   Wed Feb 19 00:35:23 2014 Koji Update LSC ALS locked with LSC! Great. I indeed disabled all of the triggers and the normalization during my trial but in vain.      9651   Wed Feb 19 01:33:03 2014 Jenne Update LSC ALS locked with LSC! I am also not able to lock the ALS using the 'regular' LSC filters.  To figure out what filters were doing what, I made      9652   Wed Feb 19 03:07:22 2014 Jenne Update LSC ALS locked with LSC! No more progress tonight.  I am still unable to lock the ALS using the regular LSC filters.  I went back to      9654   Wed Feb 19 11:00:16 2014 ericq Update LSC Some Simulation Efforts  Q EDIT: THIS IS WRONG. I LOCKED PRC ON THE CARRIER  As Koji measured the other day: MICH and      9655   Wed Feb 19 11:45:12 2014 Jenne Update LSC Scripts for ALS being modified We need to change several scripts for use with the new ALS-in-the-LSC paradigm:      9656   Wed Feb 19 14:14:46 2014 ericq Update LSC Some Simulation Efforts  Q EDIT: THIS IS WRONG. I LOCKED PRC ON THE CARRIER Koji noted oddities in the sensing matrix results      9657   Wed Feb 19 16:42:08 2014 ericq Update LSC Some Simulation Efforts Disregard previous ELOGs, I had the PRC locked on carrier       9658   Wed Feb 19 18:21:33 2014 manasa Update LSC Scripts for ALS modified                                9659   Wed Feb 19 22:47:26 2014 Jenne Update LSC ALS locked using LSC model, Common & Diff transitioned to IR transmission signals [Jenne, Koji, Manasa, EricQ] Today we successfully locked the ALS using the      9660   Fri Feb 21 12:45:57 2014 ericq Update LSC Equivalent Displacement Noise from QPD Dark Noise in SQRTINV EQ UPDATE: Measured it wrong the first time, fixed now. I measured the spectra of the SQRTINV      9668   Tue Feb 25 00:00:01 2014 rana, jenne Update LSC reasons that the REFL signals may be degenerate now We're exploring some effects which may give some funny macroscopic detuning and cause a near phase degeneracy in the REFL      9669   Tue Feb 25 02:46:38 2014 rana, jenne Update LSC Changing PRCL offset changes REFL 165 degeneracy [Jenne, Rana] We put offsets in the PRCL and MICH loops, and measured sensing matrices for      9670   Tue Feb 25 14:48:49 2014 ericq Update LSC Changing PRCL offset changes REFL 165 degeneracy After speaking with Jenne and Gabriele, I did a little bit of simulating based on my earlier code that looked at the angle      9671   Tue Feb 25 16:07:33 2014 ericq Update LSC Changing PRCL offset changes REFL 165 degeneracy  And glossing over the MICH offset, here's the PRC offset plots in displacement, rather than radians.      9673   Tue Feb 25 17:27:41 2014 Jenne Update LSC REFL signals calibrated I have recalibrated the REFL signals. I first adjusted the demod phases until the I-signals lined up with the I-phase

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