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  40m Log, Page 58 of 344  Not logged in ELOG logo
IDup Date Author Type Category Subject Text Attachments
  2876   Tue May 4 06:32:58 2010 albertoConfigurationPSLRC Temperature Servo Turned OFF temporarily


   
        
            
  
  2877   Tue May 4 13:14:43 2010 josephbUpdateCDSlsc.mdl and ifo.mdl to build (with caveats)I got around to actually try building the
LSC and IFO models on megatron.  Turns
out "ifo" can't be used as a model
  
  2878   Tue May 4 14:57:53 2010 josephbUpdateComputersOttavia has movedOttavia was moved this afternoon from the
control room into the lab, adjacent to Mafalda
in 1Y3 on the top shelf.  It has been
  
  2879   Tue May 4 18:40:27 2010 ranaHowToElectronicsMarconi phase noise measurement setupTo check the UGF, I increased the gain
of the PLL by 10 and looked at how much the
error point got suppressed. The green trace
 Untitled.pngifrnoise.png 
  2880   Wed May 5 01:19:05 2010 KojiUpdateIOOMC spot centering cont"dKoji and Zach
We improved the beam axis rotaion
on the MC. We still have 
 steering.png 
  2881   Wed May 5 02:37:55 2010 ranaConfigurationPSLRC Temperature Servo Turned OFF temporarily


   
        
            
 Picture_7.png 
  2882   Wed May 5 16:32:39 2010 AlbertoUpdate40m UpgradingNew REFL55 PD, 11MHz rejectionHere's the (calibrated) transimpedance
of the new REFL55 PD.
T(55.3) / T_(11.06) = 93 dB
 2010-05-05_REFL55_CalibratedOpticalResponse0-60MHz.png 
  2883   Wed May 5 16:58:21 2010 KojiUpdatePSL2W hooked up to the interlock serviceBen, Steve, and Koji
Ben came to the 40m and hooked up
a cable to the main interlock service.
  
  2884   Thu May 6 01:06:16 2010 KojiUpdateIOOMC spot centering cont'd (Triumph)Zach and Koji,
We
finally aligned the incident beam enough
  
  2885   Thu May 6 11:34:35 2010 robUpdateCDSlsc.mdl and ifo.mdl to build (with caveats)


   
        
            
  
  2886   Thu May 6 16:18:37 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiodeAfter munching analytical models, simulations,
measurements of photodiodes I think I got
a better grasp of what we want from them,
 pox11.pdf 
  2887   Thu May 6 17:47:01 2010 Alberto, kiwamu, Jc The 3rd (aka The Drigg)OmnistructureTMIMinutes from the Lab Organization Commitee meetingToday we met and we finally come up with
a lot of cool, clever, brilliant, outstanding
ideas to organize the lab.
  
  2888   Thu May 6 17:54:44 2010 Zach Korth -- Committee Oversight (Fun Division)OmnistructureTMIMinutes from the Lab Organization Commitee meetingWhere are we going to put the tiki bar?
The ice cream machine? I am disappointed
in the details that appear to have been glossed
  
  2889   Thu May 6 18:25:20 2010 JenneUpdatePEMAcc power supply turned onThe accelerometer power supply / preamp
board has been OFF because of exciting new
accelerometer measurements.  It's now
  
  2890   Thu May 6 18:43:58 2010 ranaUpdatePEMNoise floor of the Ranger SeismometerI
added a noise model of the SR560 to the LISO
opamp.lib. This assumes you're
 ranger.pdf 
  2891   Thu May 6 19:23:54 2010 FrankSummaryComputerssvn problemsi tried to commit something this afternoon
and got the following error message:
Command: Commit  
  
  2892   Thu May 6 19:51:22 2010 JenneUpdatePEMNew 'Seismic Spectrum of the 40m'For reasons unknown, the seismic spectra
posted above Rosalba has been wrong since
~January when it was first posted. 
 SeisRef_6May2010_AccelCalFudged.png 
  2893   Thu May 6 19:57:26 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiode


   
        
            
 pox11.pdf 
  2894   Fri May 7 11:21:49 2010 kojiUpdate40m UpgradingNew improved design for the 11MHz photodiodeHow much is the width?

  
  2895   Fri May 7 14:51:04 2010 josephbUpdateCDSWorking on meta .mdl file scriptsI'm currently working on a set of scripts
which will be able to parse a "template"
mdl file, replacing certain key words, with
  
  2896   Fri May 7 18:18:02 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiode


   
        
            
  
  2897   Fri May 7 19:02:27 2010 ranaUpdate40m UpgradingNew improved design for the 11MHz photodiodeTo measure the width of a resonance, the
standard method is to state the center frequency
and the Q. Use the definition of Q from the
  
  2898   Fri May 7 21:55:59 2010 kiwamuUpdatePSLremove Mach-Zehnder [Koji, Kiwamu]
The
 NO_MachZehnder_s.jpg 
  2899   Sat May 8 02:38:08 2010 KojiSummaryIOOMC incident powerAs per Steve's request I checked the
MC incident power as a function of time.
The output is negative: the lower
 MC_input.png 
  2900   Sat May 8 03:09:15 2010 KojiUpdateIOOSteering around MCAfter the MZ-removal work:
- I found that the input steering
(IM1) was right handed. This was different
  
  2901   Sun May 9 20:02:23 2010 ranaConfigurationSUSSUS filters deleted again to reduce CPU load on c1susvme2 againOn Friday, I deleted a bunch of filters
from the c1susvme2 optics' screens (MC1,2,3
+ SRM) so as to reduce the CPU load and keep
 40.png400.png 
  2902   Mon May 10 16:59:35 2010 AlbertoUpdate40m UpgradingUnexpected oscilaltionin the POY11 PDThe measured transimpedance of the latest
POY11 PD matches my model very well up to
100 MHz. But at about ~216MHz I have a resonance
 2010-05-10_POY11_CalibratedOpticalResponse0-500MHz.pngPOX11.png 
  2903   Mon May 10 17:47:16 2010 josephbSummaryCDSFinishedSo I finished writing a script which takes
an .ipc file (the one which defines channel
names and numbers for use with the RCG code
  
  2904   Mon May 10 18:56:53 2010 ranaUpdateElectronicsUnexpected oscilaltionin the POY11 PDWhere did you get the 55nH based notch
from? I don't remember anything like that
from the other LSC PD schematics. This is
  
  2905   Mon May 10 19:09:45 2010 ranaUpdateElectronicsUnexpected oscilaltionin the POY11 PD


   
        
            
  
  2906   Mon May 10 19:29:33 2010 AlbertoHowToElectronicsNew Focus 1811 PD calibrated against New Focus 1611 PDI measured the output impedance of the
New Focus 1611 PD (the 1GHz one) and it is
50 Ohm for both the DC and the AC output.
  
  2907   Mon May 10 20:03:22 2010 KevinUpdateGreen LockingGreen Laser Beam ProfileKiwamu and Kevin measured the beam profile
of the green laser by the south arm ETM.
The following measurements were made
 vbp.jpgvbp_residuals.jpghbp.jpghbp_residuals.jpg 
  2908   Mon May 10 20:33:29 2010 KojiSummaryCDSFinishedThis IPC stuff looks really a nice improvement
of CDS.
Please just maintain the wiki updated
  
  2909   Mon May 10 22:25:03 2010 KojiUpdateGreen LockingGreen Laser Beam ProfileHey, what a quick work!
But,
wait...
  
  2910   Tue May 11 14:39:17 2010 AidanUpdateGreen LockingGreen Laser Beam Profile 
 Here's a photo of the set-up
used. The beam profile is measured relative
 P5110057_beams.jpg 
  2911   Tue May 11 16:38:16 2010 josephb,rana,rolfUpdateCDSCDS questions and thoughts1) What is c1asc doing?  What is ascaux
used for?  What are the cables labeled
"C1:ASC_QPD" in the 1X2 rack really
  
  2912   Tue May 11 17:02:43 2010 KevinUpdateGreen LockingGreen Laser Beam Profile 

 vbp.jpgvbp_residuals.jpghbp.jpghbp_residuals.jpg 
  2913   Tue May 11 18:58:49 2010 ranaHowToElectronicsMarconi phase noise measurement setupJust a little while ago, at 2330 UTC on
5/11, I swapped the phase noise setup to
use another Marconi - this time its the 3rd
 Untitled.png 
  2914   Wed May 12 02:21:56 2010 ranaHowToElectronicsMarconi phase noise measurement setupFinally got the 3-cornered-hat measurement
of the IFRs done. The result is attached.
 pn.png 
  2915   Wed May 12 02:35:13 2010 Koji, Rana, KiwamuUpdateGreen LockingReflection from ETM and ITM !We succeeded in getting
the reflected green beam from both ITMY and
  
  2916   Wed May 12 03:42:38 2010 KojiUpdateGreen LockingGreen Laser Beam ProfileStrange.
I thought the new  result became twice of
the first result. i.e. w0=32um or so. 
  
  2917   Wed May 12 03:52:54 2010 KojiUpdateGreen LockingReflection from ETM and ITM !I could not understand this operation.
Can you explain this a bit more?
It sounds different from the standard
  
  2918   Wed May 12 03:56:54 2010 KojiUpdateIOOFaraday alignedZach and Koji
The old small MMT was removed and
wrapped by Al foils.
  
  2919   Wed May 12 09:16:29 2010 steveUpdateGreen LockingReflection from ETM and ITM ! 
 Now I know why Rana was wearing
his bright green pants yesterday. It is nice
  
  2920   Wed May 12 10:33:32 2010 kiwamuUpdateGreen LockingRe: Reflection from ETM and ITM !The procedure you wrote down as a standard
is right.   I explain reasons why
we didn't do such way. 
  
  2921   Wed May 12 12:25:11 2010 KojiUpdateGreen LockingRe: Reflection from ETM and ITM !???
I still don't understand. What principle
are you rely on?
  
  2922   Wed May 12 12:32:04 2010 josephbConfigurationCDSModified /etc/rc.d/rc.local on megatronI modified the /etc/rc.d/rc.local file
on megatron removing a bunch of the old test
module names and added the new lsc and lsp
  
  2923   Wed May 12 12:58:26 2010 josephbConfigurationCDSSetup fb to handle lsc, lsp models on megatronI modified /cvs/cds/caltech/target/fb and
changed the line "set controller_dcu=10"
to "set controller_dcu=13" (where
  
  2924   Wed May 12 17:10:16 2010 AlbertoUpdate40m UpgradingRF frequency generation box - step 0I started putting together the components
that are coint to go inside the frequency
generation box. Here's how it looked like:
 DSC_1499_small.JPG 
  2925   Wed May 12 23:31:17 2010 AlbertoUpdate40m Upgrading216 MHz resonance in the POY11 PD killedIt turned out that the resonance at 216
MHz in the 11MHz PD that I showed in the
elog entry 2902
 POX11.png2010-05-12_POY11_CalibratedOpticalResponse0-500MHz.png 
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