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ID Date Author Type Category Subject Text Attachments
  2942   Tue May 18 01:40:56 2010 KojiUpdateIOOFirst steps toward MC mode measuringOK. Don't worry. This is just an initial
confusion which we also had for the suspensions
a while ago.
  
  2941   Mon May 17 19:42:11 2010 JenneUpdateIOOFirst steps toward MC mode measuring[Jenne, Kevin, Steve]
We made some progress toward getting
the MC's beam profile measured.  In
  
  2940   Mon May 17 17:17:49 2010 josephb, steve, alberto, kiwamuUpdateCDSNew CDS computers now in racks.We placed 3 new computers in the racks. 
One in 1X4 (machine running SCX) and 2 in
1Y4 (LSC and SUS).  These are 1U chassis,
  
  2939   Mon May 17 10:57:16 2010 steveConfigurationSUSdamping restored to ETMYsETMY-south sus damping was restored   
  2938   Mon May 17 02:10:10 2010 KojiConfigurationIOOHow to lock / align the MCLet
me remind you how to lock and align the IMC
To lock
  
  2937   Sun May 16 19:25:45 2010 KojiUpdateGreen Lockingreflected beam at PDDon't
make a short cut. The beam size at a single
place does not tell you anything. 
  
  2936   Sun May 16 12:51:08 2010 kiwamuUpdateGreen Lockingreflected beam at PDMode matching
to the cavity has been done.
  
  2935   Sat May 15 04:13:33 2010 KojiSummaryIOOMC table leveledFixing at the next time is absolutely OK.

  
  2934   Fri May 14 16:19:22 2010 JenneUpdatePEMGuts of a Guralp[Jenne, Rana]
We took apart and examined one of
the Guralp seismometers this afternoon. 
  
  2933   Fri May 14 16:14:37 2010 KevinUpdateGreen LockingGreen Laser Beam Profile

    
        
 profile.pngresiduals.png 
  2932   Fri May 14 12:14:26 2010 josephbUpdateCDSNeed to track down old code for lsc system and remove themI'm currently in the process of tracking
down what legacy code is interfering with
the new lsc model.
  
  2931   Fri May 14 10:33:01 2010 ZachSummaryIOOMC table leveledAh... no, I didn't. That explains why there
were loose dogclamps on the table. I wrapped
them in foil and put them on the clean cart.
  
  2930   Fri May 14 08:18:46 2010 steveUpdateGreen LockingReflection from ETM and ITM !I stopped AWG  1 Hz drive to ITMYs.
ITMXe was also driven or oscillating. ITMXe
damping was off, so I turned it on. It did
 itmx1hzos.jpg 
  2929   Fri May 14 03:30:45 2010 KojiSummaryIOOMC table leveledThanks Zach.This was a great job.
It was not mentioned but: was the
Faraday clamped down on the table?
  
  2928   Thu May 13 23:59:46 2010 ZachSummaryIOOMC table leveled After the recent removal of the old
IMMT and the relocation of the Faraday isolator,
the MC table was tilted a bit (southward
  
  2927   Thu May 13 15:19:44 2010 josephbUpdateCDSTrying to get lsc.mdl and lsp.mdl workingI had a chat with Alex this morning and
discovered that the dcu_ids 13,14,15,16 are
reserved currently, and should not be used. 
  
  2926   Thu May 13 05:06:43 2010 ranaUpdate40m Upgrading216 MHz resonance in the POY11 PD killed 
 This idea was tried before
by Dale in the ~1998 generation of PDs. Its
  
  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 
  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 
  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
  
  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
  
  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?
  
  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. 
  
  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
  
  2918   Wed May 12 03:56:54 2010 KojiUpdateIOOFaraday alignedZach and Koji
The old small MMT was removed and
wrapped by Al foils.
  
  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
  
  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. 
  
  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
  
  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 
  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 
  2912   Tue May 11 17:02:43 2010 KevinUpdateGreen LockingGreen Laser Beam Profile 

 vbp.jpgvbp_residuals.jpghbp.jpghbp_residuals.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
  
  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 
  2909   Mon May 10 22:25:03 2010 KojiUpdateGreen LockingGreen Laser Beam ProfileHey, what a quick work!
But,
wait...
  
  2908   Mon May 10 20:33:29 2010 KojiSummaryCDSFinishedThis IPC stuff looks really a nice improvement
of CDS.
Please just maintain the wiki updated
  
  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 
  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.
  
  2905   Mon May 10 19:09:45 2010 ranaUpdateElectronicsUnexpected oscilaltionin the POY11 PD


   
        
            
  
  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
  
  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
  
  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 
  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 
  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
  
  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 
  2898   Fri May 7 21:55:59 2010 kiwamuUpdatePSLremove Mach-Zehnder [Koji, Kiwamu]
The
 NO_MachZehnder_s.jpg 
  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
  
  2896   Fri May 7 18:18:02 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiode


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

  
  2893   Thu May 6 19:57:26 2010 AlbertoUpdate40m UpgradingNew improved design for the 11MHz photodiode


   
        
            
 pox11.pdf 
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