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ID Date Author Type Category Subject Text   102   Tue Aug 23 08:46:04 2016 Gabriele General Daily Progress Daily tests MO03 - edge polished: Turbo off, QPD centered, before excitation (60 seconds)      103   Tue Aug 23 09:21:25 2016 Gabriele General General Status of Mark Optics disks We initially received 20 disks (75 mm diameter, 1 mm thickness) from Mark Optics. Here's their status as of today      104   Tue Aug 23 09:44:11 2016 Gabriele General General Measurements on MO-02 Two good ring-downs measurements were performed on MO-02. The first one was already reported in a previous elog  7x    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      106   Sun Sep 11 10:05:33 2016 Gabriele General Daily Progress New substrate in the chamber I installed one of the new substrates (with flats) into the chamber, and started the pumpdown at about 9:45am LT.      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      108   Tue Sep 13 10:33:35 2016 Gabriele General General Disk excited Disk excited with white uniform noise, amplitude 5 V, for some tens of seconds. Excitation off at      109   Wed Sep 14 13:08:05 2016 Gabriele General General Ringdown with roughing pump off At 1:05pm LT I stopped the roughing pump and started a ring-down measurement. Pump restarted at 2:18pm LT.      110   Wed Sep 14 20:17:33 2016 Gabriele General General Band-limited excitation Excitation started at 20:15:30LT, 20 seconds long. The excitation is band-limited (10 Hz) centered around each of the predicted      111   Thu Sep 15 08:13:20 2016 Gabriele General General Pump had no effect on ring down measurements The plot below shows three measurements of the Q of the same disk: during the first two the roughing pump was on, while during      112   Thu Sep 15 08:27:57 2016 Gabriele General General New band-limited excitation Same as in elog #110, but now the amplitude is proportional to frequency squared:      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      114   Thu Sep 15 15:15:10 2016 Gabriele General General Edge effect on losses I made a COMSOL model that can compute the distribution of elastic energy for each mode, dividing it into:      115   Fri Sep 16 14:06:43 2016 Gabriele General General Pump had no effect on ring down measurements Same plot as below, but this time with estimated 95% confidence intervals for the Q values, as obtained from the fit only.      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.      117   Tue Sep 20 16:12:09 2016 Gabriele General General Pump down As a test, I installed MO1 (the disk with the burn mark, used for the first edge laser polishing test) and started pumping down.      118   Tue Sep 20 16:43:58 2016 Gabriele General General Excitation and ring down The pressure is at abour 3e-6 Torr. I centered the QPD and started an excitation. The HV amplifier manual states that the driver can      119   Wed Sep 21 08:12:13 2016 Gabriele General General Excitation and ring down New excitation (2000V) at about 8:06am. Had to recenter the QPD again after the excitation. Engaged the 500Hz high pass filter      120   Wed Sep 21 14:42:47 2016 Gabriele General General Serialized (etched) disk installed Just for fun, I installed the disk thas has been etched in the center with "1234". I figured out that the ESD PCB was probably      121   Thu Sep 22 09:49:21 2016 Gabriele General General Ring-down of etched disk QPD centerd, quiet data, light off, one minute from PDT: 2016-09-22 09:46:29.393609      122   Thu Sep 22 13:39:40 2016 Gabriele Optics Configuration Updated design for the new C.Ri.Me. setup Today I measured the amount of space available on the table for the new (4-fold) C.Ri.Me. setup. It's 1050 x 1220 mm, with the      123   Thu Sep 22 15:00:49 2016 Gabriele Electronics Configuration Epics values now saved to frames I was looking at some past trend data and discovered that EPICS values were not written to the frames. I added the following two      124   Fri Sep 23 08:11:48 2016 Gabriele Mechanics Daily Progress Test of the disk retaining ring motion In brief, it doesn't work. The magnets and coils are strong enough to push up the ring with a sample inside, but the friction      125   Fri Sep 23 08:33:39 2016 Gabriele Electronics Configuration Epics values now saved to frames Now EPICS values are saved to frames, but they are all zero! I noticed that we always had the same problems with the cymac2 too.      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.      127   Mon Sep 26 15:59:09 2016 Gabriele Optics Daily Progress QPD auto centering We have a few motorized mounts (with New Focus picomotors) and one controller (an old New Focus 8753, six axis total) that      128   Tue Sep 27 08:53:46 2016 Gabriele General Vacuum Etched disk installed Installed the etched disk: using manually the centering ring allowed me to get the beam on the QPD. A couple of taps to the      129   Tue Sep 27 14:54:53 2016 Gabriele Electronics Configuration Epics values now saved to frames Apparently, there was a mismatch in the configuration, and DAQD was adding a wonderful 16 Hz comb all over the spectrum.      130   Tue Sep 27 15:10:59 2016 Gabriele General Measurements Ring-down of etched disk Quiet (roughing pump off, lights off): 60 seconds from PDT: 2016-09-27 15:05:30.805667 PDT      131   Wed Sep 28 10:26:58 2016 rana General General references on ideal glasses Some easy to read reviews on thin films and ideal glass for people getting started in this Q measuring game.      132   Thu Sep 29 15:40:45 2016 Gabriele Optics Design Beam profile of new 21mW HeNe laser and tweak of optical lever design I measured the beam profile of the new Thorlabs HeNe (21.8 mW measured). The beam waist is 355 microns, very close to the laser      133   Mon Oct 17 10:50:50 2016 Gabriele General Vacuum No sign of problems in the electrostatic drive I opened the chamber and took the etched disk out. Inspection of the electrostatic drive does not show any sign of burn or damage.      134   Tue Oct 18 16:29:37 2016 Gabriele General Measurements S1600433 S1600433, annealing run 10/10/2016 Installation  Installed in the measurement system, chamber closed pump down started at 4:27pm LT turbo  17x    135   Tue Oct 18 16:52:16 2016 Gabriele General Measurements Sample inspections from annealing run 10/10/2016 LIGO-T1600466 S1600432 shows some residual on face, close to the edge, probably from      136   Wed Oct 19 13:35:23 2016 Gabriele General Measurements S1600438 S1600438, not annealed, as received from Mark Optics Installation Turbo pump switched off at 11:42am (2016-10-19) Turbo      137   Wed Oct 19 16:40:24 2016 sults: General Measurements S1600349 S1600439, not annealed, as received from Mark Optics Installation installed and balanced, pump down started at 4:38pm  10x    138   Wed Oct 19 17:08:47 2016 Gabriele General Measurements S1600433 vs S1600438 S1600433 has been annealed, was contaminated by the iron oxide, and it was cleaned using first contact. No residual      139   Thu Oct 20 11:04:03 2016 Gabriele General Measurements Sample with flame polished edges Sample with edges flame polished in Glasgow Installation into the chamber and balanced at 11am. Pump down started at 11:00am. it looks like  7x    140   Thu Oct 20 14:38:24 2016 Gabriele Clean Daily Progress Cleaning of S1600433 and S1600438 Samples #433 (annealed and cleaned) and #438 (as received from Mark Optics) are now with GariLynn for deep cleaning.      141   Fri Oct 21 13:45:21 2016 Gabriele General Measurements S1600447 Sample S1600447, as received from Mark Optics, second batch Measurements Installed into the chamber, pumping down started at  13x    142   Fri Oct 21 14:03:17 2016 Gabriele General Vacuum Roughing pump moved I moved the roughing pump out of the clean room, adding an extension hose.        143   Fri Oct 21 15:27:15 2016 Gabriele Electronics Configuration Removed low pass filter in SUM I removed the low pass filter in the QPD SUM signal, used for normalization. This reduced a lot the bump at ~20kHz due to laser      144   Mon Oct 24 10:26:30 2016 Gabriele General Measurements S1600439 S1600439, post annealing Measurements before annealing reported in elog 137.      145   Mon Oct 24 14:33:46 2016 Gabriele General Measurements Effect of annealing: Q increases S1600439 has been measured as received (before annealing, elog 137) and after annealing (elog      146   Mon Oct 24 16:32:01 2016 Gabriele General Measurements S1600448 Sample S1600447, as received from Mark Optics, second batch in chamber, pumping down at 4:30pm (2016-10-24) pumps  9x    147   Tue Oct 25 09:12:31 2016 Gabriele General Measurements Comparison of first and second batch The plot below compares a sample from the first batch and two samples from the second batch. All samples are as received from Mark  6x    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      149   Thu Oct 27 14:02:38 2016 Alena General General Annealing Annealing run (447-448) on 3" wafers - Crime 10/27/2016 https://dcc.ligo.org/T1600485-v1        150   Fri Oct 28 21:20:48 2016 Gabriele General Measurements S1600447 post annealing Installation I had some problems in installing the wafer. I balanced it and started the pump down a couple of times,  6x    151   Sat Oct 29 10:12:39 2016 Gabriele General Measurements S1600448 post annealing 2016-10-29 venting at 10:00am 10/29 sample installed, pumping down started at 10:12am, turbo pump  9x

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