40m QIL Cryo_Lab CTN SUS_Lab CAML OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  Coating Ring-down Measurement Lab elog, Page 3 of 18  Not logged in ELOG logo
ID Date Authorup Type Category Subject Text Attachments
  699   Wed May 22 07:41:23 2019 AlenaGeneralMeasurementsS1600542 S1600664 S1600680 S16006782019-05-22

08:00 am
in chamber

S1600542 in CR1
in CR2
S1600678 in CR3
  700   Thu May 23 09:59:09 2019 AlenaGeneralMeasurementsS1600649 S1600650 S1600651 S1600652 2019-05-23

09:50 am
in chamber

S1600649 in CR1
in CR2
S1600651 in CR3
  701   Thu May 23 18:16:11 2019 AlenaGeneralMeasurementsS1600709 S1600710 S1600711 S16007122019-05-23

18:00 in

S1600709 in CR1
in CR2
S1600711in CR3
  703   Tue May 28 15:48:42 2019 AlenaGeneralVacuumLow pressure gauge exchangeAfter venting the vacum chamber (CR14)
a few times, checking for leaks and trying
to tune settings to the gauges controller,
  704   Wed May 29 08:36:07 2019 AlenaGeneralMeasurementsS1600713 S1600714 S1600715 S1600716 2019-05-24

15:00 in

S1600713 in CR1
in CR2
S1600715in CR3
  705   Thu May 30 13:53:03 2019 AlenaGeneralMeasurementsS1600717 S1600718 S1600719 S16007202019-05-30

14:30 in

S1600717 in CR1
in CR2
S1600719in CR3
  706   Tue Jun 4 15:07:55 2019 AlenaGeneralMeasurementsS1600542 S1600664 S1600678 S16006802019-06-04

15:10 in

S1600542 in CR1
in CR2
S1600678 in CR3
  707   Fri Jun 7 07:32:51 2019 AlenaGeneralMeasurementsS1600542 S1600664 S1600678 S16006802019-06-06

15:40 in

S1600542 in CR1
in CR2
S1600678 in CR3
  854   Tue Mar 31 13:12:21 2020 AlenaGeneralMeasurementsS1600784 S1600785 S1600789 S16007912020-03-31

1:00 pm
in chamber

S1600784in CR1
in CR2
S1600789 in CR3
  256   Fri Jan 6 12:19:22 2017 Alena, Bob, Stephen and CalumGeneralDaily ProgressSecond vacuum chamberCleaning and baking (200 C air foe SS and
120 for Al) parts for the new vacuum chamber

  155   Tue Nov 1 15:34:49 2016 Alena, CalumGeneral Annealing runAnnealing run (449-453) on 3" wafers
- Crime 11/01/2016 https://dcc.ligo.org/T1600507
  174   Thu Nov 10 16:07:13 2016 Alena, CalumGeneralGeneralAnnealing runAnnealing run (466-471) on 3" wafers
- Crime 11/10/2016

  184   Mon Nov 14 08:54:49 2016 Alena, CalumGeneralGeneralAnnealing runAnnealing run (472-477) on 3" wafers
- Crime 11/11/2016 https://dcc.ligo.org/T1600527
  90   Fri Aug 19 13:46:55 2016 Alena, Calum, Jon, Liz, Steve, GabrieleFacilityDaily ProgressClean room and vacuum completeThis morning we installed the clean room
curtains and washed them. It turns out that
the air filters are supposed to be powered
  67   Thu Jul 28 13:58:48 2016 Alena, GabrieleCleanDaily ProgressThe old chamber is now being cleaned and bakedCleaned the chamber in the washing machine
at 40m and started 48 baking at 120 C
  86   Tue Aug 16 11:53:30 2016 Alena, GabrieleCleanDaily ProgressClean room progressSome progress on the cleam room: bar fixed
to the wall, some more structure built, filters
in place. We had to (literally) work around
  337   Fri Apr 7 14:12:52 2017 Eric, GabrieleGeneralGeneralS1600525 S1600526 S1600527 S16005282017-04-07

2:12pm in
chamber, pumps on

in CR1
S1600526 in CR2
  9   Mon May 2 11:46:45 2016 GabrieleFacilityDaily ProgressTable and vacuum chambers in the labElogs for the new Coatin
  10   Tue May 3 11:57:47 2016 GabrieleFacilityDaily ProgressTable and vacuum chambers in the labWe discovered a couple of days ago that
the table was sitting on three legs only
and the fourth one was dangling. I managed
  11   Fri May 6 14:20:43 2016 GabrieleElectronicsDesignDesign 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 
  13   Tue May 10 13:32:17 2016 GabrieleElectronicsDesignDesign 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 GabrieleElectronicsDesignOptical lever electronics designThe circuit design sent out for fabrication
is available in the DCC: D1600196
  15   Thu May 19 11:36:04 2016 GabrieleMechanicsDesignA first design of the disk assemblyHere are some screenshots of the disk assembly
and a look at how four of them will sit into
the vacuum chamber. The Solidworks models
  16   Fri May 20 15:18:58 2016 GabrieleOpticsDesignOptical levers layoutAttached a first layout of the optical
lever systems. The beam spot radius on the
QPD is about 0.8 mm, and the lever arm length
  17   Sun May 22 23:40:45 2016 GabrieleOpticsDesignOptical levers layoutAn improved design is attached. I modified
the input telescope to avoid using shor focal
length lenses, to make it less critical,
  18   Thu May 26 02:51:27 2016 GabrieleElectronicsDesignESD designA preliminary design of the ESD board is
available on the DCC: D1600214
  19   Fri May 27 02:09:37 2016 GabrieleMechanicsCharacterizationLowest usable mode of fused silica disksI did some FEA simulation of fused silica
disks, to identify the lowest usable eigenmode.
By usable I mean a mode that has zero elastic
  20   Mon Jun 6 13:35:36 2016 GabrieleElectronicsGeneralComponentsThe PCBs for the QPD circuit and ADC interface
are here and look ok. All electronics components
are also here (except for the ADC connector
  21   Tue Jun 7 14:07:55 2016 GabrieleFacilityGeneralRack and workstationI moved the unused rack from the Crackling
Noise lab to the C.Ri.Me lab. It will be
used for the new cymac. I also started putting
  22   Fri Jun 10 13:44:06 2016 GabrieleElectronicsConfigurationHow to setup a workstationInstructions on how to setup a workstation
are available here:

  23   Thu Jun 16 00:47:42 2016 GabrieleOpticsDaily ProgressQuality factor measurement of a Mark Optics disk at LMA[Massimo Granata (LMA), Quentin Cassar
(LMA), Gabriele] 

This week I'm visiting LMA
  24   Fri Jun 24 17:03:47 2016 GabrieleElectronicsDaily ProgressQPD electronicsBetween 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 GabrieleElectronicsDaily ProgressQPD electronicsTransimpendance and whitening are working
properly. I can't get useful signal out
of the differential stages yet. I replaced
  26   Wed Jun 29 16:44:17 2016 GabrieleGeneralConfigurationFirst disk eigenfrequencyThe following table shows the lowest eigenfrequency
(Hz) for different sizes of disks

  27   Thu Jun 30 16:18:28 2016 GabrieleElectronicsDaily ProgressQPD electronics is workingToday 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 GabrieleElectronicsDaily ProgressCymacI 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 GabrieleElectronicsDaily ProgressQPD electronics noise 

I turned out that all the noise
I was seeing in the QPD spectrum was due
  31   Thu Jul 7 17:44:11 2016 GabrieleFacilityDaily ProgressVacuum chamber tests[Alena, Gabriele]

This afternoon we opened the tall
belljar vacuum chamber, and took everything
  34   Fri Jul 8 16:49:11 2016 GabrieleElectronicsConfigurationCyMAC 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 GabrieleElectronicsConfigurationCymac RTS configurationI copy here parts of an email from Jamie
with instructions on how to run the RTS on
the cymac:
  37   Mon Jul 11 15:21:12 2016 GabrieleGeneralDaily ProgressOne disk installed into the chamber[Alena, Gabriele]

We attached one of the silicon
lenses to a 1" optical post using some
  39   Tue Jul 12 17:19:07 2016 GabrieleElectronicsDaily ProgressADC and DAC cablingThis afternoon I completed the assembly
of the electronics boards to interface the
ADC and DAC. The ADC is interfaced with a
  42   Thu Jul 14 17:06:47 2016 GabrieleElectronicsConfigurationNetworkingThe 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 GabrieleElectronicsDaily ProgressElectrostatic actuator installedUsing the already installed high voltage
feedthrough, I cabled one of the electrostatic
actuators (1mm gap between electrodes) and
  44   Fri Jul 15 17:56:50 2016 GabrieleGeneralDaily ProgressQPD connected to digital systemI connected the QPD to the ADC interface
with a temporary cable running on the floor.

I could get signals. I still have
  45   Sat Jul 16 14:15:44 2016 GabrieleFacilityDaily ProgressPump down startedFollowing Alena's
procedure, at about 1:30pm LT I started
the chamber pump down. At 14:15pm LT the
  46   Mon Jul 18 13:39:45 2016 GabrieleFacilityDaily ProgressPump down startedToday at 1:40pm pressure is 8.5e-7 Torr

  47   Mon Jul 18 13:42:46 2016 GabrieleElectronicsCharacterizationQPD signal conventionThe QPD quadrants are wired accoridng to
the following convention
  48   Mon Jul 18 14:29:07 2016 GabrieleGeneralDaily ProgressStatus of the test setupI checked that the QPD electronics works
as expected, and that I can acquire the signals
using the ADCs. A new model (x3cr1) is up
  49   Mon Jul 18 17:46:04 2016 GabrieleGeneralDaily ProgressFirst look at QPD signalsHere's the first spectrum of the QPD
X and Y signals, acquired with the digital
system. Roughing and turbo pumps are still
ELOG V3.1.3-