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IDdown Date Author Type Category Subject Text Attachments
  4195   Mon Jan 24 13:08:07 2011 kiwamuUpdateGreen LockingRe: X arm locked !


   
        
            
 e_pll_oltf.png 
  4194   Mon Jan 24 10:39:16 2011 josephbHowToDAQDAQ Wiki FailureActually
both port 8087 and 8088 work to talk to the
frame builder.  Don't let the lack of
  
  4193   Mon Jan 24 10:19:21 2011 KojiUpdateGreen LockingX arm locked !Well... The ALS loop is engaged and the
error was suppressed. 
So, how is the IR error signal stabilized
  
  4192   Mon Jan 24 09:33:08 2011 ranaUpdateGreen LockingX arm locked !Very cool.
But the PLL seems very fishy to me.
The ZP-3MH needs 13 dBm to operate correctly.
  
  4191   Mon Jan 24 02:58:46 2011 kiwamuUpdateGreen LockingX arm locked !I succeeded in  time_series.pnggreen_one_arm.png 
  4190   Sat Jan 22 02:23:26 2011 KojiUpdateGreen Lockingsome more progressWhat is the point to use the error instead
of the feedback? It does not make sense to
me.
  
  4189   Sat Jan 22 02:11:09 2011 kiwamuUpdateGreen Lockingsome more progress[Rana, Suresh, Kiwanu]

  
  4188   Sat Jan 22 02:03:55 2011 KojiUpdateGreen LockingExamining the stability of VCO PLL at low frequenciesDamn.
If this figure is true, we were looking at
wrong signal. We should look at the feedback
  
  4187   Sat Jan 22 01:56:04 2011 SureshUpdateGreen LockingExamining the stability of VCO PLL at low frequencies[Kiwamu,
Suresh, Rana]
Our
 VCO_PLL_stability.pngVCO_PLL_stability.png 
  4186   Fri Jan 21 23:55:25 2011 ranaConfigurationLSCPhase Noise Measurement filterWe've set up a beat note measurement between
the VCO driver and the Marconi (see Suresh's
elog).
 a.gif 
  4185   Fri Jan 21 23:17:54 2011 ranaHowToDAQDAQ Wiki FailureThe DAQ Wiki pages say to use port 8088
for restarting the Frame Builder. I tried
this to no avail.
  
  4184   Fri Jan 21 17:59:27 2011 josephb, alexUpdateCDSFixed Dolphin transmissionThe orientation
of the Dolphin cards seems to be opposite
on c1lsc and c1sus.  The wide part is
  
  4183   Fri Jan 21 15:26:15 2011 josephbUpdateCDSc1sus broken yesterday and now fixed[Joe,
Koji]
Yesterday's CDS swap of c1sus and
  
  4182   Fri Jan 21 11:45:01 2011 AidanConfigurationLockingBallpark figures for Green Locking PLLs (Digital vs Analogue)

    

       
            
  
  4181   Fri Jan 21 02:45:43 2011 kiwamuUpdateGreen Lockinginterface for PLL to ADC  [Suresh, Kiwamu]
  
  
  4180   Thu Jan 20 22:17:12 2011 ranaSummaryLSCFPMI Displacement NoiseI found this old plot in an old elog entry
of Osamu's (original
link).
 osamu-1140657006.pdf 
  4179   Thu Jan 20 18:20:55 2011 josephbUpdateCDSc1iscex computer and c1sus computer swappedSince
the 1U sized computers don't have enough
slots to hold the host interface board, RFM
  
  4178   Thu Jan 20 17:00:39 2011 AidanConfigurationLockingBallpark figures for Green Locking PLLs (Digital vs Analogue)If we use a digital PLL for locking the
frequency of the PSL and END green lasers
then we can expect a UGF of around 1kHz (assuming
  
  4177   Thu Jan 20 15:39:59 2011 AidanUpdateLockingUpper limit on frequency noise of ADC[Aidan, Kiwamu]
Kiwamu and I plugged the output from
a DS3456 function generator into the ADC
 Sine-wave-width-test_of_ADC.pdf 
  4176   Thu Jan 20 15:15:39 2011 kiwamuUpdateGreen Lockingstatus update: PLL connected to ADCI
realized that the black AA board I mentioned
  
  4175   Thu Jan 20 10:15:50 2011 josephbUpdateCDSc1scy errorThis is
caused by an insufficient number of active
DAQ channels in the C1SCY.ini file located
  
  4174   Thu Jan 20 04:43:28 2011 kiwamuUpdateGreen Lockingstatus update: PLL connected to ADC I
connected the PLL signal to the ADC on c1ioo. 
  
  4173   Thu Jan 20 04:03:02 2011 kiwamuUpdateCDSc1scy error I found
that c1scy was not running due to a daq initialization
  
  4172   Thu Jan 20 01:50:30 2011 KevinUpdateElectronicsPOX Transfer Functions[Koji, Kevin]
We fit the entire POX optical transfer
function from 1 MHz to 500 MHz in LISO. The
  
  4171   Thu Jan 20 00:39:22 2011 kiwamuHowToCDSDAQ setup : another trickHere
is another trick for the DAQ setup when you
add a DAQ channel associated with a new front
  
  4170   Wed Jan 19 17:00:23 2011 KevinUpdateElectronicsPOX Transfer Functions The value of I_dc was a mistake.
The value should be 240 µA.
The widths of the resonance peaks
  
  4169   Wed Jan 19 10:45:00 2011 KojiUpdateElectronicsPOX Transfer FunctionsTF looks fine except for the large peak
at around 200MHz which has been reported
by Rana. The time series and the spectrum
  
  4168   Wed Jan 19 10:31:24 2011 josephbUpdateelogElog restarted againElog wasn't
responding at around 10 am this morning. 
I killed the elogd process, then used the
  
  4167   Wed Jan 19 04:25:54 2011 KevinUpdateElectronicsPOX Transfer FunctionsI redid the optical POX transfer functions
and updated the wiki at http://lhocds.ligo-wa.caltech.edu:8000/40m/Electronics/POX.
I measured each transfer function
  
  4166   Wed Jan 19 03:37:30 2011 SureshUpdateLockingcomparing the PSL with the X-end-NPRO through the green beat 
 
 [Kiwamu, Suresh]
 Phase_noise_in_digital_frequency_dividers.pdf 
  4165   Tue Jan 18 10:25:23 2011 steveUpdatePEMvertex crane work this weekThe crane people are here. The Vertex chambers
are covered with plastic. The PSL HEPAs will
be running on high during the day.
  
  4164   Mon Jan 17 20:13:38 2011 ranaUpdateElectronicsPOX_11 Optical TFI used 50 mA to drive the laser diode.
The light is split 50/50 between the DUT
(Device Under Test) and the New Focus 1611
 A.TIF 
  4163   Mon Jan 17 15:31:50 2011 josephbUpdateCamerasTest the Basler acA640-100gm cameraThe Basler
acA640-100gm is a power over ethernet camera. 
It uses a power injector to supply power
 PylonViewer.jpg 
  4162   Mon Jan 17 04:10:10 2011 ranaConfigurationComputersNTPD restarted on c1dcuepics (to fix the MEDM screen times)I installed NTPD on Megatron (its Ubuntu,
so different from the CentOS workstations).
Here's the terminal cap to show that its
  
  4161   Sun Jan 16 02:20:59 2011 SureshUpdateLockingcomparing the PSL with the X-end-NPRO through the green beatObjective:
      We
wish to study the coherence of the two NPROs
 P1160510.JPGP1160511.JPGP1160515.JPGP1160516.JPG 
  4160   Fri Jan 14 20:39:20 2011 ranaUpdateCDSUpdated some DAQ channel namesI like this activateDAQ script, but someone   
  4159   Fri Jan 14 20:37:00 2011 kiwamuHowToGreen Lockingplan for this month I summarized how we proceed our green
locking in this month on the wiki.
Since step1 and 2 shown on the wiki
 green_plan.png 
  4158   Fri Jan 14 17:58:50 2011 OsamuConfigurationGeneralStandalone RT setup I'll be gone to Hanford site next
week and come back to Caltech on 24th's week.
I setup a standalone RT system at
  
  4157   Fri Jan 14 17:13:39 2011 josephbUpdateCamerasPylon driver for Basler Cameras installed on MegatronAfter getting some help from the Basler
technical support, I was directed to the
following ftp link:
  
  4156   Fri Jan 14 12:34:08 2011 KojiUpdateLSCX arm locked with C1LSC digital controlMy feeling was that the saturation was
caused by the LSC whitening filter which
was always on.
  
  4155   Fri Jan 14 12:29:57 2011 KojiUpdateLockingNext steps for the greenThese are the next steps for a better operation
of the arm locking. They are suitable for
the day time activities
  
  4154   Fri Jan 14 11:29:00 2011 kiwamuUpdateLSCexpected open loop TF of X arm lockingHere shows a plot of the expected open
loop transfer function (TF) for the X arm
locking.
 xarm_oltf.png 
  4153   Fri Jan 14 01:55:26 2011 kiwamuUpdateLSCX arm locked with C1LSC digital control [Koji, Kiwamu]
  
  4152   Thu Jan 13 16:41:07 2011 josephbUpdateCDSChannel names for LSC updatedI renamed most of the filter banks in the
c1lsc model.  The input filters are
now labeled based on the RF photodiode's
  
  4151   Thu Jan 13 16:34:02 2011 josephbUpdateComputers32 bit matlab updatedThere
was a problem with running the webview report
generator in matlab on Mafalada.  It
  
  4150   Thu Jan 13 14:21:13 2011 josephbUpdateCDSWebview of front end model files automatedAfter
Rana pointed me to Yoichi's MEDM snapshot
script, I learned how to use Xvfb, which
  
  4149   Thu Jan 13 12:56:57 2011 ranaUpdateIOOWFS shenanigansActually, I just found out that there are
different flavors of 'YAG-444'. 
There's a YAG-444AH and also a YAG-444-4AH.
 PerkinElmerQPDs.pdf 
  4148   Thu Jan 13 03:00:01 2011 JenneUpdateIOOWFS shenanigansMy goal
this afternoon was to
 D990249-B-1_MCWFS_schematic.pdf 
  4147   Wed Jan 12 22:39:16 2011 SureshUpdateIOOPut MC PZT offset onto MC board, instead of on awkward cart


   
        
            
 P1120508.JPGP1120509.JPGD040180-B_with_5V_offset.pdf 
  4146   Wed Jan 12 22:33:24 2011 kiwamuUpdateCDSMC2 dewhitening are healthy except for URI briefly
checked the MC2 analog dewhitening filters.
It
  
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