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ID Date Author Type Category Subject Text   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      2703   Tue Mar 23 18:44:46 2010 Mott Update ABSL PLL reconstructed    After realigning and getting the lock today, I tried to add in the SR785      4832   Fri Jun 17 16:05:07 2011 kiwamu Update ABSL LightWave out of MOPA box [Suresh / Kiwamu]  We did the following things :      4840   Mon Jun 20 11:38:49 2011 kiwamu Update ABSL I-P curve of LightWave M126-1064-700 The I-P curve of the LightWave NPRO (M126-1064-700), which was taken out from the MOPA box, was      4841   Mon Jun 20 13:48:25 2011 Koji Update ABSL I-P curve of LightWave M126-1064-700 Hmm. Was the current within the operating range? (i.e. Is it a 700mW laser or a 1W one?)      4842   Mon Jun 20 16:44:02 2011 steve Update ABSL I-P curve of LightWave M126-1064-700    Put the serial numbers into the elog. So we can identify the laser and      4855   Wed Jun 22 15:24:10 2011 kiwamu Update ABSL got a laser controller for LightWave Peter King came over to the 40m with a laser controller and gave it to us.      4872   Thu Jun 23 22:59:45 2011 kiwamu Update ABSL I-P curve of LWE  The      4874   Fri Jun 24 00:13:24 2011 kiwamu Update ABSL beam profile measurement of LWE The beam profile of the LWE (LightWave Electronics) NPRO was measured.      4877   Fri Jun 24 07:49:23 2011 steve Update ABSL I-P curve of LWE with serial numbers                                4917   Thu Jun 30 03:26:40 2011 kiwamu Update ABSL status update Status update of the absolute length (ABSL) measurement:      4923   Thu Jun 30 14:11:55 2011 kiwamu Update ABSL a photo of ABSL setup on the AP table Here is a picture of the latest ABSL setup at the east part of the AP table.      4925   Thu Jun 30 21:00:20 2011 kiwamu Update ABSL fine alignment done (Just a quick report) The fine alignment of the ABSL laser injection      4939   Tue Jul 5 16:09:54 2011 kiwamu Update ABSL some photos for ABSL setup Here I show two photos of the latest ABSL (ABSolute Length measurement) setup.       4940   Tue Jul 5 17:38:46 2011 kiwamu Update ABSL ABSL laser frequency-locked In this past weekend the ABSL laser was successfully      5079   Mon Aug 1 04:08:24 2011 kiwamu Update ABSL Arm length measurement : cavity kick technique I made some attempts to measure the current length of      5095   Tue Aug 2 16:55:21 2011 rana Update ABSL Arm length measurement : cavity kick technique                                5117   Thu Aug 4 09:42:19 2011 Koji Update ABSL ABSL Laser shutter closed The shutter of the ABSL laser is closed for the vent work.      8257   Fri Mar 8 12:57:57 2013 Annalisa Update ABSL BS installed on ITMY table  Sendhil and I installed the S polarized BS on the ITMY table to steer the NPRO beam through the AR wedge and align it to the      8258   Fri Mar 8 13:42:35 2013 Jenne Update ABSL BS installed on ITMY table Re:  POY beam reduction. We are able to lock the Yarm with the beam / gain as it is.  I had thought      8303   Mon Mar 18 12:02:12 2013 Annalisa Configuration ABSL ABSL setup for g-factor measurement of PRC Motivations The ABSL technique has been already used in the past to measure the       8361   Wed Mar 27 21:53:21 2013 Annalisa Update ABSL Beat note of ATF auxiliary laser After measuring the beat note, the "Alberto" NPRO auxiliary laser has been moved from the PSL table to the POY table. Its beam      8369   Thu Mar 28 23:00:30 2013 Annalisa Update ABSL Beat note of ATF auxiliary laser found   The beat note for the ATF lab laser has been found.       8495   Fri Apr 26 10:50:07 2013 Annalisa Update ABSL ATF laser on PSL The ATF NPRO auxiliary laser has been moved on the PSL table. All the optics for beat note measurement are in place and alignment      677   Wed Jul 16 09:27:17 2008 steve Update ALARM PSL-FSS_RMTEMP alarm is false Morning alarm sound is good for people who does not drink coffee. Our 40m alarm is on every morning.      1615   Thu May 21 12:58:32 2009 rob Configuration ALARM PEM count-half disabled I've disabled the alarm for PEM_count_half, using the mask in the 40m.alhConfig file.  We can't do anything about it, and it's just      2549   Tue Jan 26 20:18:32 2010 rana Configuration ALARM op540m: alarms and BLRMS and StripTool restored I turned the StripTool and ALARMS and BLRMS back on on op540m. Looks like it has been rebooted 5 days ago and no one turned these

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