40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  Coating Ring-down Measurement Lab elog, Page 1 of 18  Not logged in ELOG logo
New entries since:Wed Dec 31 16:00:00 1969
ID Date Author Typeup Category Subject Text Attachments
  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
 20160728_092350.jpg 
  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
 2016-08-16_10.25.05.jpg 
  88   Wed Aug 17 16:41:05 2016 Gabriele, AlenaCleanDaily ProgressClean room construction progressThe clean room frame is built and secured
to the floor and wall. Panels are being installed
on the ceiling and back. Also, the optical
 2016-08-17_15.29.40.jpg2016-08-17_15.30.05.jpg 
  89   Thu Aug 18 18:15:18 2016 Gabriele, AlenaCleanDaily ProgressClean room construction progressCeiling, back and side panels are installed.
The air filters have been cabled and connected
to the power supply.
 2016-08-18_18.07.29.jpg2016-08-18_18.07.42.jpg 
  140   Thu Oct 20 14:38:24 2016 GabrieleCleanDaily ProgressCleaning of S1600433 and S1600438Samples #433 (annealed and cleaned) and
#438 (as received from Mark Optics) are now
with GariLynn for deep cleaning.
  
  689   Mon May 13 18:37:47 2019 aaronCleanGeneralClean room gearMon May 13 18:37:37 2019

Entered CRIME lab to borrow 4x
hair nets and face masks. Can you 
  
  696   Mon May 20 10:35:45 2019 aaronCleanGeneralClean room gearAaron,

There is a buy list of approved
clean room supplies posted here https://dcc.ligo.org/LIGO-E1300399.
  
  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 
 qpd.PDFBreakout.PDF 
  12   Sun May 8 13:35:04 2016 ranaElectronicsDesignDesign 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 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
  
  18   Thu May 26 02:51:27 2016 GabrieleElectronicsDesignESD designA preliminary design of the ESD board is
available on the DCC: D1600214
  
  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
 2016-06-06_13.29.01.jpg 
  22   Fri Jun 10 13:44:06 2016 GabrieleElectronicsConfigurationHow to setup a workstationInstructions 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 GabrieleElectronicsDaily ProgressQPD electronicsBetween yesterday and today I populated
one QPD board (based on D1600196),
and started testing it. The transimpedance
 2016-06-24_16.31.48.jpg2016-06-24_16.31.52.jpg 
  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
  
  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
 2016-06-30_11.08.31.jpg 
  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
 qpd_noise.pngqpd_noise_m.png2016-07-01_15.12.44.jpg 
  30   Thu Jul 7 16:40:22 2016 Gabriele ElectronicsDaily ProgressQPD boxesTo mitigate the issue of ambient light
pulluting the QPD signal, I mounted the prototype
into a custum built box. This helps a lot.
 2016-07-07_15.55.06.jpg 
  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
 Screen_Shot_2016-07-08_at_4.38.16_PM.png 
  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:
  
  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
 2016-07-12_15.57.17.jpg2016-07-12_16.59.17.jpg2016-07-12_16.59.13.jpg 
  40   Thu Jul 14 15:30:48 2016 ericqElectronicsConfigurationCymac RTS configurationWe 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 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
 2016-07-15_15.02.29.jpg2016-07-15_15.02.56.jpg2016-07-15_15.03.03.jpg2016-07-15_15.03.09.jpg 
  47   Mon Jul 18 13:42:46 2016 GabrieleElectronicsCharacterizationQPD signal conventionThe QPD quadrants are wired accoridng to
the following convention
 qpd.png.pngScreenshot-Untitled_Window.png 
  50   Mon Jul 18 17:48:58 2016 GabrieleElectronicsConfigurationStatus 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 GabrieleElectronicsConfigurationGlitches are a digital artifactThe glitches I saw in the data happens
roughly every second, even though not
exactly on the second. They are suddend jumps
 glitches.pngglitches.pngjump1.pngjump2.png 
  55   Wed Jul 20 10:26:40 2016 GabrieleElectronicsConfigurationAre 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 GabrieleElectronicsGeneralGlitches are of digital originSo here's the final proof that the
glitches I see are digital:


There is a positive jump
 glitches_hene_table.pngglitch_hene_table_2.png 
  58   Fri Jul 22 14:22:10 2016 GabrieleElectronicsConfigurationInvestigations on the signal jumps[Rolf, Ben, Rich, Gabriele]

Rolf couldn't find any good
explanation on the software side for the
 glithces.pngglitch2.png 
  59   Mon Jul 25 12:24:06 2016 GabrieleElectronicsConfigurationMore on the signal jumpsHere are two more tests I did this morning


removed the DAC card from
the cymac and the models, and restarted everything:
 no_glitches_on_cymac2_b.pngno_glitches_on_cymac2.png 
  61   Mon Jul 25 17:44:13 2016 GabrieleElectronicsCharacterizationHigh frequency noise budgetI measured the noise sources limiting the
QPD sensitivity. Unfortunately, I had to
do some MATLAB tricks to get rid of the glitches:
 qpd_noises.pngqpd_noise_budget.png 
  62   Tue Jul 26 11:45:03 2016 GabrieleElectronicsCharacterizationHigh frequency noise budgetJust 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
 noise_budget.pngnoise_budget.pngnoise_budget_whitened.png 
  63   Wed Jul 27 08:59:12 2016 GabrieleElectronicsGeneralPressure now in torrThe 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.
 pressure.png 
  64   Wed Jul 27 10:19:36 2016 GabrieleElectronicsConfigurationLast finding in the signal jump sagaThis plot shows a signal which is generated
purely digitally inside a code that I was
testing.
 glitch_with_all_digital_signal.pngpmt_cymac3.pngpmt_cymac2.png 
  69   Thu Jul 28 17:15:22 2016 GabrieleElectronicsDaily ProgressADC/DAC interfaces upgradeInstalled the ADC and DAC boards into a
proper box. Also, swapped the temporary DAC
board (with cale hack) with the final one.
 2016-07-28_17.02.46.jpg2016-07-28_17.03.11.jpg 
  71   Mon Aug 1 16:56:57 2016 GabrieleElectronicsDaily ProgressPopulated four new QPD boardsToday I populated four more QPD boards.
All components are installed, except for
the QPD themselves.
  
  72   Tue Aug 2 15:58:12 2016 GabrieleElectronicsDaily ProgressSix QPD functional and testedI finished populating the new four QPD
boards, and fixed the first one I populated
weeks ago. I tested all five new boards:
 2016-08-02_15.15.43.jpg 
  73   Tue Aug 2 16:00:32 2016 GabrieleElectronicsCharacterizationMore on the signal jumpsSo I’m
sending a 1.123 Hz sinusoid into the ADC,
 out1.pngout2.pngout3.png 
  75   Wed Aug 10 09:39:38 2016 GabrieleElectronicsDaily ProgressAnnuntio vobis gaudium magnum: habemus CymacYesterday I cloned the cymac2 disk and
installed it into the cymac3.

Jamie tweaked a few things (I can't
 qpd_spectra.png 
  78   Thu Aug 11 09:10:01 2016 GabrieleElectronicsConfigurationReal time modelCompiled and installed an updated real
time model. It acquires the four QPD segments,
compute sum and differences, and normalize.
 model1.pngmodel2.pngmain_medm.png 
  79   Thu Aug 11 10:59:39 2016 GabrieleElectronicsConfigurationQuadrant calibrationI 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 GabrieleElectronicsConfigurationStorage added to cymac3Installed 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 GabrieleElectronicsDaily ProgressSome python code Today I wrote some auxiliary functions
that will be useful for the measurement system:


noise.py: set of functions
 noise.pngnoise_multi_band.pngpeak.png 
  84   Sun Aug 14 18:13:52 2016 GabrieleElectronicsDaily ProgressProgress on the user interfaceSome progress on writing the user interface:

 crime1.pngcrime2.png 
  87   Tue Aug 16 11:57:03 2016 GabrieleElectronicsConfigurationFixed cymac3 network and time issueThe 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
  
  123   Thu Sep 22 15:00:49 2016 GabrieleElectronicsConfigurationEpics values now saved to framesI was looking at some past trend data and
discovered that EPICS values were not written
to the frames. I added the following two
  
  125   Fri Sep 23 08:33:39 2016 GabrieleElectronicsConfigurationEpics values now saved to framesNow EPICS values are saved to frames, but
they are all zero! I noticed that we always
had the same problems with the cymac2 too.
  
ELOG V3.1.3-