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ID Date Author Type Category Subject Text   81   Sat Aug 13 11:17:17 2016 Gabriele Facility Daily Progress Spot the differences        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      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      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.      77   Thu Aug 11 08:45:19 2016 Gabriele General General QPD signals with dielectric filter I installed a dielectric laser line filter (Thorlabs FLH05633-5, center wavelength 633 nm, FWHM 5 nm) in front of the QPD. In this      76   Wed Aug 10 10:04:35 2016 Gabriele Mechanics Daily Progress The prototype of the disk retain system is here Yesterday we received the prototype of the disk suspension and retain system. Everything looks good. I checked that the disk fits  6x    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      74   Mon Aug 8 10:42:46 2016 Gabriele General General Dependency of eigenmode frequencies on thickness and diameter I ran a set of COMSOL simulations to determine the dependency of the frequency of each eigenmode on the disk thickness and diameter, within  26x    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,      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:      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.      70   Fri Jul 29 14:08:31 2016 Gabriele General Daily Progress Peak tracking code for real time model Summary I wrote a C function to reconstruct the amlplitude and frequency of a line. It can be added as a block into      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.      68   Thu Jul 28 14:01:27 2016 Alena General Daily Progress Clean room Ordered the clean room (hardware+hepa filters) and vacuum gauges      67   Thu Jul 28 13:58:48 2016 Alena, Gabriele Clean Daily Progress The old chamber is now being cleaned and baked Cleaned the chamber in the washing machine at 40m and started 48 baking at 120 C      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      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      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.      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.      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      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:      60   Mon Jul 25 15:35:31 2016 Gabriele Optics Characterization Calibration of the QPD in physical units The equations below are wrong. Please refer to https://nodus.ligo.caltech.edu:8081/CRIME_Lab/116      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:      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      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      56   Thu Jul 21 12:10:14 2016 Gabriele General Daily Progress Glitch hunting Yesterday I could clearly see the glitches as jumps in the time domain plot of X and Y signals, and trace them to somewhat harder      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      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      53   Tue Jul 19 17:21:48 2016 Gabriele General Daily Progress First modes excited! We can't generate any arbitary signal with the real time model, since awg is not working properly yet. For the moment being      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      51   Mon Jul 18 18:05:46 2016 Gabriele Optics Daily Progress Optical setup Small modifications to the optical setup: added a 1m focal lenght lens (AR coated for 1064nm...) right before      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:      49   Mon Jul 18 17:46:04 2016 Gabriele General Daily Progress First look at QPD signals Here's the first spectrum of the QPD X and Y signals, acquired with the digital system. Roughing and turbo pumps are still      48   Mon Jul 18 14:29:07 2016 Gabriele General Daily Progress Status of the test setup I checked that the QPD electronics works as expected, and that I can acquire the signals using the ADCs. A new model (x3cr1) is up      47   Mon Jul 18 13:42:46 2016 Gabriele Electronics Characterization QPD signal convention The QPD quadrants are wired accoridng to the following convention      46   Mon Jul 18 13:39:45 2016 Gabriele Facility Daily Progress Pump down started Today at 1:40pm pressure is 8.5e-7 Torr      45   Sat Jul 16 14:15:44 2016 Gabriele Facility Daily Progress Pump down started Following Alena's procedure, at about 1:30pm LT I started the chamber pump down. At 14:15pm LT the      44   Fri Jul 15 17:56:50 2016 Gabriele General Daily Progress QPD connected to digital system I connected the QPD to the ADC interface with a temporary cable running on the floor. I could get signals. I still have      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      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      41   Thu Jul 14 16:56:00 2016 Alena Facility Daily Progress test vacuum system Please see prosidures for pumping down and venting with air for the test vacuum chamber here      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      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      38   Mon Jul 11 17:04:06 2016 Alena Facility Daily Progress Vacuum chamber tests At 5pm the pressure was 6.5e-6 torr. Checked again at: 9am, pressure was 2e-6      37   Mon Jul 11 15:21:12 2016 Gabriele General Daily Progress One disk installed into the chamber [Alena, Gabriele] We attached one of the silicon lenses to a 1" optical post using some      36   Mon Jul 11 14:56:45 2016 Alena Facility Daily Progress Vacuum chamber tests Installed a gate valve between the roughing and tubbo pump. See below a pump down curve. The convection gauge is not calibrated. the      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:      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      33   Fri Jul 8 15:26:37 2016 Alena Facility Daily Progress Vacuum chamber tests Fixed the 307 gauge controller (a missing contact on the rair panel). The low pressure gauge was connected to 1G port and has measured      31   Thu Jul 7 17:44:11 2016 Gabriele Facility Daily Progress Vacuum chamber tests [Alena, Gabriele] This afternoon we opened the tall belljar vacuum chamber, and took everything

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