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ID Date Author Type Category Subject Text   52   Tue Jul 19 17:15:37 2016 Gabriele Facility Daily Progress Vacuum pressure acquired [Alena, Gabriele] We connected the analog output of the vacuum gauge controller to one of      65   Wed Jul 27 11:27:11 2016 Gabriele Facility General Pumps stopped and venting 11:25am LT: closed valve between roughing and turbo pumps, switched off both pumps. Turbo pump is slowing down      66   Wed Jul 27 15:43:02 2016 Gabriele Facility Daily Progress Vacuum chamber dismantled and ready for cleaning [Alena, Gabriele] As decided at out Red Door meeting, we're going to clean the vacuum chamber      81   Sat Aug 13 11:17:17 2016 Gabriele Facility Daily Progress Spot the differences        90   Fri Aug 19 13:46:55 2016 Alena, Calum, Jon, Liz, Steve, Gabriele Facility Daily Progress Clean room and vacuum complete This morning we installed the clean room curtains and washed them. It turns out that the air filters are supposed to be powered      113   Thu Sep 15 11:23:13 2016 Gabriele Facility General Chamber open Turbo pump off and spinning down at 9:37am LT. Pumo completely stopped at 11:15am LT Openend the chamber and removed      126   Mon Sep 26 15:54:01 2016 Gabriele Facility Configuration Moved vacuum controllers I moved the turbo pump controller out of the clean room. Also, I installed the gauge controller on the Cymac rack.      216   Tue Nov 29 17:02:06 2016 Gabriele Facility Noise hunting Suspending the roughing pump I suspended the roughing pump with four springs. The reduction of the 58 Hz peak is similar to what I got when the pump was      265   Thu Jan 19 12:49:17 2017 Gabriele Facility Vacuum Skyhook installed The SkyHook has been put in place and bolted down to the floor.      430   Thu Sep 14 15:59:10 2017 Gabriele Facility   All wrapped up for Saturday plumbing work        11   Fri May 6 14:20:43 2016 Gabriele Electronics Design Design of optical lever electronics For the optical levers we are going to use the same QPD that are used in aLIGO optical levers (see T1600085 and       12   Sun May 8 13:35:04 2016 rana Electronics Design Design of optical lever electronics Koji, Rich, and I recently came up with a new QPD design which is better for general lab use than the aLIGO ones (which have a      13   Tue May 10 13:32:17 2016 Gabriele Electronics Design Design of optical lever electronics After a very useful discussion with Rich this morning, I think the circuit based on aLIGO optical levers design should be good      14   Thu May 19 11:33:44 2016 Gabriele Electronics Design Optical lever electronics design The circuit design sent out for fabrication is available in the DCC: D1600196      18   Thu May 26 02:51:27 2016 Gabriele Electronics Design ESD design A preliminary design of the ESD board is available on the DCC: D1600214      20   Mon Jun 6 13:35:36 2016 Gabriele Electronics General Components The PCBs for the QPD circuit and ADC interface are here and look ok. All electronics components are also here (except for the ADC connector      22   Fri Jun 10 13:44:06 2016 Gabriele Electronics Configuration How to setup a workstation Instructions on how to setup a workstation are available here: https://nodus.ligo.caltech.edu:8081/Cryo_Lab/1135      24   Fri Jun 24 17:03:47 2016 Gabriele Electronics Daily Progress QPD electronics Between yesterday and today I populated one QPD board (based on D1600196), and started testing it. The transimpedance      25   Tue Jun 28 10:17:28 2016 Gabriele Electronics Daily Progress QPD electronics Transimpendance and whitening are working properly. I can't get useful signal out of the differential stages yet. I replaced      27   Thu Jun 30 16:18:28 2016 Gabriele Electronics Daily Progress QPD electronics is working Today I gave up trying to fix the first board I populated, and built a second one. The good news is that it's working as      28   Thu Jun 30 17:23:54 2016 Gabriele Electronics Daily Progress Cymac I got two new ADC and DAC boards from Rolf, with the correct PCIe interface. I installed them into the cymac and checked that the      29   Fri Jul 1 15:12:12 2016 Gabriele Electronics Daily Progress QPD electronics noise   I turned out that all the noise I was seeing in the QPD spectrum was due      30   Thu Jul 7 16:40:22 2016 Gabriele Electronics Daily Progress QPD boxes To mitigate the issue of ambient light pulluting the QPD signal, I mounted the prototype into a custum built box. This helps a lot.      34   Fri Jul 8 16:49:11 2016 Gabriele Electronics Configuration CyMAC In the last days Jamie installed the patched kernel to run the real time system (RTS) on the new CyMAC. Today (with Jamie's      35   Mon Jul 11 08:49:25 2016 Gabriele Electronics Configuration Cymac RTS configuration I copy here parts of an email from Jamie with instructions on how to run the RTS on the cymac:      39   Tue Jul 12 17:19:07 2016 Gabriele Electronics Daily Progress ADC and DAC cabling This afternoon I completed the assembly of the electronics boards to interface the ADC and DAC. The ADC is interfaced with a      40   Thu Jul 14 15:30:48 2016 ericq Electronics Configuration Cymac RTS configuration We played around a bit with the cymac, in efforts to make things better. We disabled some more fancy-sounding      42   Thu Jul 14 17:06:47 2016 Gabriele Electronics Configuration Networking The laboratory workstation is coatings.ligo.caltech.edu The RTS is cymac3.ligo.caltech.edu I set up a ssh-mount of the /opt/rtcds/userapps      43   Fri Jul 15 16:05:07 2016 Gabriele Electronics Daily Progress Electrostatic actuator installed Using the already installed high voltage feedthrough, I cabled one of the electrostatic actuators (1mm gap between electrodes) and      47   Mon Jul 18 13:42:46 2016 Gabriele Electronics Characterization QPD signal convention The QPD quadrants are wired accoridng to the following convention      50   Mon Jul 18 17:48:58 2016 Gabriele Electronics Configuration Status of real time system and workstation [EricQ, Gabriele] The real time system seems to be working properly, except for the excitations:      54   Tue Jul 19 20:19:38 2016 Gabriele Electronics Configuration Glitches are a digital artifact The glitches I saw in the data happens roughly every second, even though not exactly on the second. They are suddend jumps      55   Wed Jul 20 10:26:40 2016 Gabriele Electronics Configuration Are glitches a digital artifact? Not so sure anymore... those glitches do not happen at regular times I tried to send      57   Thu Jul 21 14:58:26 2016 Gabriele Electronics General Glitches are of digital origin So here's the final proof that the glitches I see are digital: There is a positive jump      58   Fri Jul 22 14:22:10 2016 Gabriele Electronics Configuration Investigations on the signal jumps [Rolf, Ben, Rich, Gabriele] Rolf couldn't find any good explanation on the software side for the      59   Mon Jul 25 12:24:06 2016 Gabriele Electronics Configuration More on the signal jumps Here are two more tests I did this morning removed the DAC card from the cymac and the models, and restarted everything:      61   Mon Jul 25 17:44:13 2016 Gabriele Electronics Characterization High frequency noise budget I measured the noise sources limiting the QPD sensitivity. Unfortunately, I had to do some MATLAB tricks to get rid of the glitches:      62   Tue Jul 26 11:45:03 2016 Gabriele Electronics Characterization High frequency noise budget Just to confirm that my noise estimates make sense, here's a plot of the not-normalized QPD signal that gives the X motion (sum and      63   Wed Jul 27 08:59:12 2016 Gabriele Electronics General Pressure now in torr The old channel X3:CR1-PRESSURE_LOGTORR does not exist anymore. The new channel is now directly in torr and it is called X3:CR1-PRESSURE_TORR.      64   Wed Jul 27 10:19:36 2016 Gabriele Electronics Configuration Last finding in the signal jump saga This plot shows a signal which is generated purely digitally inside a code that I was testing.      69   Thu Jul 28 17:15:22 2016 Gabriele Electronics Daily Progress ADC/DAC interfaces upgrade Installed the ADC and DAC boards into a proper box. Also, swapped the temporary DAC board (with cale hack) with the final one.      71   Mon Aug 1 16:56:57 2016 Gabriele Electronics Daily Progress Populated four new QPD boards Today I populated four more QPD boards. All components are installed, except for the QPD themselves.      72   Tue Aug 2 15:58:12 2016 Gabriele Electronics Daily Progress Six QPD functional and tested I finished populating the new four QPD boards, and fixed the first one I populated weeks ago. I tested all five new boards:      73   Tue Aug 2 16:00:32 2016 Gabriele Electronics Characterization More on the signal jumps So I’m sending a 1.123 Hz sinusoid into the ADC,      75   Wed Aug 10 09:39:38 2016 Gabriele Electronics Daily Progress Annuntio vobis gaudium magnum: habemus Cymac Yesterday I cloned the cymac2 disk and installed it into the cymac3. Jamie tweaked a few things (I can't      78   Thu Aug 11 09:10:01 2016 Gabriele Electronics Configuration Real time model Compiled and installed an updated real time model. It acquires the four QPD segments, compute sum and differences, and normalize.      79   Thu Aug 11 10:59:39 2016 Gabriele Electronics Configuration Quadrant calibration I cross checked the calibration of the sum channel with a  power meter. Now all quadnant signals X3:Q?_OUT and the sum      80   Fri Aug 12 10:33:14 2016 Gabriele Electronics Configuration Storage added to cymac3 Installed two new 2TB disks into the cymac3. Also, the main disk has a 1TB partition with the operating system, so I created a new      83   Sun Aug 14 11:40:29 2016 Gabriele Electronics Daily Progress Some python code Today I wrote some auxiliary functions that will be useful for the measurement system: noise.py: set of functions      84   Sun Aug 14 18:13:52 2016 Gabriele Electronics Daily Progress Progress on the user interface Some progress on writing the user interface:

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