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ID Date Author Type Category Subject Text   2261   Thu Nov 12 18:10:27 2009 Alberto Update ABSL PLL Locked I locked the PLL and made some first measuremtns of the spectrum of the error signal. I'll post them later.      2321   Tue Nov 24 14:33:22 2009 Alberto Update ABSL working on the AP table I'm working on the AP table. I also opened the auxiliary NPRO shutter. The auxiliary beam is on its path on the AP table and PSL      2324   Tue Nov 24 19:16:02 2009 Alberto Update ABSL working on the AP table                                2326   Wed Nov 25 08:43:08 2009 Alberto Update ABSL Working on the AP table I'm working on the AP table. I also opened the auxiliary NPRO shutter. The auxiliary beam is on its path on the AP table and PSL      2328   Wed Nov 25 10:20:47 2009 Alberto Update ABSL AbsL PLL not able to lock Last night something happened on the beat between the PSL beam and the auxiliary NPRO beam, that spoiled the quality of the      2329   Wed Nov 25 11:02:54 2009 Alberto Update ABSL AbsL PLL not able to lock                    2334   Wed Nov 25 15:42:27 2009 Alberto Update ABSL Working on the AP table                                2337   Wed Nov 25 20:14:58 2009 Alberto Update ABSL AbsL PLL not able to lock: problem fixed                    2338   Wed Nov 25 20:24:49 2009 Alberto Update ABSL PLL Open Loop Gain Measured I measured the open loop gain of the PLL in the AbsL experiment. I repeated the measurement twice:      2339   Wed Nov 25 20:28:17 2009 Alberto Update ABSL Stopped working on the AbsL I closed the shutter of the NPRO for the night.      2342   Fri Nov 27 02:25:26 2009 rana Update ABSL PLL Open Loop Gain Measured                                2420   Tue Dec 15 21:39:34 2009 Alberto Update ABSL brief summary of this afternoon's measurements I took measurements of the open loop gain of the AbsL PLL with the old Universal PDH Box. I Also measured the      2421   Wed Dec 16 11:21:20 2009 Alberto Update ABSL Universal PDH Box Servo Filters Yesterday I measured the shape of the servo filter of both the old and the new Universal PDH boxes. Here they      2422   Wed Dec 16 11:46:25 2009 Alberto Update ABSL Absl PLL Open Loop Gain Yesterday I measured the Open Loop Gain of the PLL in the absolute length experiment. The servo I used was that of the old Universal      2423   Wed Dec 16 11:55:47 2009 rana Update ABSL Universal PDH Box Servo Filters    To me, they both look stable. I guess that the phase has to go to -180      2460   Mon Dec 28 15:34:14 2009 Alberto Update ABSL Working on the AP table I opened the auxiliary laser's shutter. I'm currently working on the AP table.      2461   Mon Dec 28 18:35:27 2009 Alberto Update ABSL Working on the AP table                                2493   Sat Jan 9 15:02:01 2010 Alberto Update ABSL PRC scanning I scanned the PRC in the frequency range of 30-60 MHz, untill the PLL lost lock. But everything is working fine. The      2502   Mon Jan 11 11:06:53 2010 Alberto Update ABSL Measurement running                                2504   Mon Jan 11 16:59:14 2010 Alberto Update ABSL Interferometer Busy I'm currently running a measurement on the PRC. Please don't interfere with the IFO      2505   Mon Jan 11 19:36:13 2010 Alberto Update ABSL Measurement running Leaving for dinner. Back in ~1hr. I left a measurement running. Please don't interfere with it till I'm back. Thanks.      2506   Mon Jan 11 21:49:17 2010 Jenne Update ABSL Measurement running                    2508   Tue Jan 12 09:37:05 2010 Alberto Update ABSL IFO available I finished measuring the AbsL for this morning. The IFO is again available. Please don't mess up with the      2513   Wed Jan 13 12:03:00 2010 Alberto Update ABSL Measurement now running. Please be careful At the moment I'm running a measurement on the PRC and I'm planning to leave it going for the time we'll be at the 40m meeting.      2521   Mon Jan 18 18:34:01 2010 Alberto Update ABSL Measurement in progress I started a long measurement of the PRC's transmissivity. I'm leaving the lab and I'm going to be back at about 8 tonight. Please      2522   Mon Jan 18 20:58:40 2010 Alberto Update ABSL Measurement in progress                    2531   Tue Jan 19 12:54:39 2010 Alberto Update ABSL Measurement in progress A measurement will be running for the next hour. Please be careful.      2532   Tue Jan 19 16:21:18 2010 Alberto Update ABSL Watchdogs not working and then fixed This afternoon the watchdogs stopped working: they didn't trip when the suspension positions crossed the threshold values.      2534   Wed Jan 20 20:11:56 2010 Alberto Update ABSL Some preliminary results from measuring PRC's transmissivity for an amplitude modulated beam Here I'm posting a plot showing a set of measurements that I made in the past few days to determine the absolute length      2536   Thu Jan 21 10:31:13 2010 Koji Update ABSL Some preliminary results from measuring PRC's transmissivity for an amplitude modulated beam Nice and interesting plot.      2541   Fri Jan 22 02:54:06 2010 Alberto Update ABSL Overnight measurement I'm leaving a measurement running overnight. It should be done in about one hour. Tomorrow morning, If you need to      2543   Fri Jan 22 14:40:49 2010 Alberto Update ABSL Overnight measurement                    2545   Mon Jan 25 16:30:37 2010 Alberto Update ABSL 166 MHz sideband turned off I turned off the modulation at 166MHZ becasue I don't need it if I'm only locking the PRC.      2546   Mon Jan 25 16:46:33 2010 Alberto Update ABSL 166 MHz sideband turned off                    2547   Tue Jan 26 03:28:56 2010 rana Update ABSL 166 MHz sideband turned off    You can turn the 166 off if you want. MZ is unhappy after its turned      2550   Wed Jan 27 11:02:30 2010 Alberto Update ABSL PRC Cavity Length  I fitted the data from scanning the PRC by changing the beat frequency of the auxiliary laser beam with the PSL beam. The      2553   Fri Jan 29 12:06:58 2010 Alberto Update ABSL Measurement running today at lunch time I just started a measuremtn that will be running for the next hour or so. Please be careful with the interferometer.      2554   Fri Jan 29 13:14:49 2010 Alberto Update ABSL Measurement running today at lunch time                    2576   Mon Feb 8 14:13:03 2010 Alberto Update ABSL PLL Characterization Lately I've been trying to improve the PLL for the AbsL experiment so that it could handle larger frequency steps and thus speed      2577   Mon Feb 8 14:56:17 2010 Alberto Update ABSL Suddenly a much better alignment of PRC I just aligned PRM and locked PRC and I noticed that SPOB is much higehr than it used to be. It's now about 1800, vs 1200      2578   Mon Feb 8 15:01:46 2010 rob Update ABSL Suddenly a much better alignment of PRC                                2579   Mon Feb 8 15:41:51 2010 Alberto Update ABSL Suddenly a much better alignment of PRC                    2581   Tue Feb 9 09:07:06 2010 Alberto Update ABSL PLL Characterization                    2582   Tue Feb 9 10:10:58 2010 Alberto Update ABSL back to analog I want to try to do the measurement with the network analyzer used as local oscillator, instead of the Marconis that I'm using now.      2679   Thu Mar 18 10:46:51 2010 Koji Update ABSL PLL reconstructed Last night (Mar 17) I checked the PLL setup as Mott have had some difficulty to get a clean lock of the PLL setting.      2680   Thu Mar 18 12:27:56 2010 Alberto Update ABSL PLL reconstructed                                2681   Thu Mar 18 13:40:35 2010 Koji Update ABSL PLL reconstructed We use the current PLL just now, but the renewal of the components are not immediate as it will take some time. Even so we need      2684   Thu Mar 18 21:42:26 2010 Koji Update ABSL PLL reconstructed I checked the setup further more.     I replaced the PD from NewFocus 1GHz one to Thorlabs PDA255.      2696   Mon Mar 22 22:11:26 2010 Mott Update ABSL PLL reconstructed    It looks like the PLL drifted alot over the weekend, and we couldn't get      2697   Mon Mar 22 23:37:32 2010 Mott Update ABSL PLL reconstructed   We have managed to lock the PLL to reasonable stability. The RF input is attenuated

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