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ID Date Author Type Category Subject Text   289   Wed Feb 1 16:58:10 2017 Gabriele General Characterization Excitation tests The excitation is working fine. However, there is a large cross coupling in the excitation between channels: so if I switch on only      422   Thu Aug 24 07:40:33 2017 Gabriele General Measurements Excitations with new ESD 2017-08-23 Excitations Quiet time before excitation: 1187577794 Excitation broadband: 1187577826      424   Fri Aug 25 07:25:32 2017 Gabriele General Measurements Excitations with new ESD The results show very low Q values, so we suspected some issues. Yesterday we openend the chamber and moved the ESD up, as high      425   Fri Aug 25 19:29:07 2017 Gabriele General Measurements Excitations with new ESD New set of excitations after raising the ESD: Quiet time before excitation:      105   Thu Sep 1 02:13:33 2016 Gabriele Optics Characterization Expected frequencies for the 75 mm disks with flats Here are the nominal parameters of the disk with flats      213   Mon Nov 28 16:02:16 2016 Gabriele General General Expected frequencies for the MIT samples      26   Wed Jun 29 16:44:17 2016 Gabriele General Configuration First disk eigenfrequency The following table shows the lowest eigenfrequency (Hz) for different sizes of disks      107   Mon Sep 12 16:00:06 2016 Gabriele General Daily Progress First fully automated measurements of ring down I finished the first version of the automation software to measure the ring down of the disk modes. I tested it with the new substrate      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      93   Sat Aug 20 22:18:26 2016 Gabriele General Daily Progress First measured Qs Using the first ring down of the day (GPS 1155754513 + 3600 seconds), I computed the amplitude of each of the modes already identified,  22x    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      285   Tue Jan 31 16:50:55 2017 Gabriele, Alena General Vacuum First pump-down with setup This afternoon we started the pump-down with all the system installed into the chamber. Unfortunately the IGM vacuum gauge isn't      92   Sat Aug 20 17:01:10 2016 Gabriele General Daily Progress First ring down measurements Everything is working pretty well. This morning the pressure was about 1.2e-6 Torr. I connected the high voltage amplifier and      292   Mon Feb 6 14:09:07 2017 Gabriele General Measurements First set of parallel measurements completed The new laser is still acting up a bit, with a wandering line moving sometimes inside the band. Nevertheless, I could perform the      267   Thu Jan 19 14:27:02 2017 Alena General Vacuum First vacuum test new chamber Turbo pump controller (new chamber) was configured. Need to reduce the frequency or setup a standby mode. First pump down:      82   Sat Aug 13 14:05:02 2016 Gabriele General Daily Progress First work on the measurement user interface Today I started programming part of the user interface that will be used to perform the measurements. Not much implemented so      87   Tue Aug 16 11:57:03 2016 Gabriele Electronics Configuration Fixed cymac3 network and time issue The cymac3 internal clock was off by about 10 seconds. When I tried to start the NTP service, I found out that the cymac3 couldn't      364   Wed Jul 5 16:40:51 2017 Zach Electronics Modeling Force disparity-improvement 2017-07-05 In order to improve my data I shrunk the region of the finer meshing slightly and made the mesh      363   Wed Jul 5 12:01:51 2017 Zach Electronics Modeling Force plots-Correct plots, force issue 2017-07-05 I sorted out my mathematical lapse in logic and computed the correct force profiles in the perpendicular      368   Fri Jul 14 16:43:24 2017 Zach Electronics Modeling Force profile matlab script 2017-07-14 I have completed a rough, but functioning script that calculates the modal force profiles. The force values      278   Thu Jan 26 17:06:59 2017 Gabriele General Daily Progress Four fold measurement system installation Today I installed the four GeNS systems into the chamber, connected the ESD to the HV feedthrough and put the periscopes in      282   Mon Jan 30 15:16:54 2017 Gabriele General Daily Progress Four samples in chamber checked that the high voltage paths are working: the DAC signal is properly received and amplified by the      356   Tue Jun 27 14:17:47 2017 Zach Electronics Modeling Further plots and improving models 2017-06-27 I built a new model of the ESD to determine whether or not the spikes in the electric field at      476   Mon Mar 5 11:03:18 2018 Gabriele, Anthony General Measurements Fused silica substrated for metallic glass tests 2018-03-05 10:45am in chamber: AK_01 in CR1 AK_02 in CR2 AK_03 in CR3 AK_04      873   Tue Jun 9 11:04:28 2020 Gabriele General Measurements GaAs S1600805 2020-06-09 11:00 am in chamber GaAs in CR1 S1600805 in CR2 11:04 am      402   Thu Aug 10 10:47:54 2017 Zach Electronics Modeling Geometry Ratios 2017-08-10 The attached plots compare the new and old geometries with .5 mm and 1 mm sample gaps. They are      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      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      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      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      226   Mon Dec 5 16:35:05 2016 Gabriele Electronics General High voltage relais We want to be able to drive any combination of the four samples in the new setup, by using only one HV amplifier.      276   Wed Jan 25 10:02:23 2017 Gabriele Electronics Daily Progress High voltage system in place This morning I installed in the clean room the high voltage amplifier and the high voltage relays. Everything is cabled as planned.      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      148   Tue Oct 25 11:10:37 2016 Gabriele General Measurements Image of S1600433 This is an image of the sample S1600433 under the microscope, courtesy of GariLynn: Link      386   Tue Aug 1 16:10:42 2017 Zach Electronics Modeling Improved Gap Sweep 2017-08-01 I completed an improved sweep of the gap between the ESD arms. I resolved some code issues, since      286   Tue Jan 31 16:55:17 2017 Gabriele General Daily Progress Improved autocenter, excitation not working, wandering line The autocenter script wasn't working in a very robust way (sometimes the socket connection to the controller failed, some      116   Tue Sep 20 15:34:00 2016 Gabriele Optics Daily Progress Improved optical lever layout Goal Improve the optical setup, by increasing the response of the QPD to disk motion.      270   Fri Jan 20 17:20:20 2017 Gabriele Optics Daily Progress Input part of the optical lever setup installed and aligned Today I installed and aligned part of the optical components for the optical lever of the new setup. For the moment being I      272   Mon Jan 23 16:29:52 2017 Gabriele Optics Daily Progress Input part of the optical lever setup installed and aligned Today I cabled and installed the four QPD, in a temporary position. I also assembled four picomotor mounts that will be used for      421   Wed Aug 23 14:11:13 2017 Zach, Gabriele Electronics Measurements Installing ESD Prototype 2017-08-23 Installed ESD Prototype design by taping it to the older design, we then lowered the mount until      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      450   Thu Jan 11 15:40:28 2018 Gabriele General Measurements LMA sample (post annealing) 2018-01-11 3:35pm in chamber CR1 3:36pm roughing pump on 3:46pm turbo pump on Excitations Quiet      432   Thu Oct 5 14:28:35 2017 Gabriele General Measurements LMA substrate 2017-10-05 2:17pm in chamber LMA substrate after cleaning in CR1 2:20pm      358   Thu Jun 29 13:15:01 2017 Alastair, Gabriele General General Laser polishing We laser polished S1600546, 547, 548, 549, 550 and 551      542   Fri Jun 22 10:53:06 2018 Alena General General Laser failure One of the HeNe lasers died (the one for measuring slots CR2 and CR4). It had no outgoing light when I came in this morning. I connected      220   Thu Dec 1 11:59:21 2016 Gabriele, Alastair General General Laser polishing Today we laser polished S1600484, S1600485 and S1600486.      205   Mon Nov 21 16:21:12 2016 Gabriele, Alastair General General Laser polishing of S1600487 The sample has been laser polished this afternoon, 0.5mm/s, average power 23 W. We moved the lens that focuses the      208   Tue Nov 22 14:11:38 2016 Gabriele General Measurements Laser polishing of bad disk improves Q, but they're still not very good Laser polishing of a sample from the second batch (S1600487, bad Q as out of the box) improves the Q values, but they're still      101   Mon Aug 22 16:59:13 2016 Gabriele, Alastair Optics Daily Progress Laser polishing of the disk edges We set up a test facility for laser polishing the disk edges, using the CO2 laser in the TCS laboratory. We focused the beam with

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