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ID Date Author Type Category Subject Text Attachments
  2736   Tue Mar 30 22:13:49 2010 KojiSummaryGreen Lockingconversion efficiency of PPKTPQuestion:
Why does the small spot size for
the case (A) have small efficiency as the
  
  2735   Tue Mar 30 21:11:42 2010 kiwamuSummaryGreen Lockingconversion efficiency of PPKTPWith a
30mm PPKTP crystal the conversion efficiency
 efficiency_waist_edit.png 
  2734   Tue Mar 30 11:16:05 2010 josephbHowToComputersezca update information (CDS SVN)I'd like to try installing an updated multi-threaded
ezca extension later this week, allowing
for 64-bit builds of GDS ezca tools, provided
  
  2733   Tue Mar 30 06:37:32 2010 ranaConfigurationPSLReference Cavity PD Noise SpectrumSome more words about the RFAM: I noticed
that there was an excess RFAM by unlocking
the RC and just looking at the RF out with
 rc.png 
  2732   Mon Mar 29 21:43:27 2010 AlbertoConfigurationPSLReference Cavity PD Noise Spectrum[Rana, Alberto]
This evening we measured the noise
spectrum of the reference cavity PD used
 2010-03-29_FSS_PD_shotnoise_and_darknoise.png2010-03-29_FSS_PD_shotnoise_and_darknoise.png 
  2731   Mon Mar 29 18:50:14 2010 KojiUpdateSUSPRM sidemagnet gluedPRM was released from the fixuture without
any trouble. This was the last magnet gluing
until ETMs are delivered.
 StatusTable.png 
  2730   Mon Mar 29 18:41:34 2010 KojiConfigurationSUSStarted to build TTsSteve and Koji
WE started to build 5 TTs. 4 of them
are used in the recycling cavities. One is
 IMG_2348.jpg 
  2729   Mon Mar 29 15:26:47 2010 MottHowToComputersNew script for controlling the AG4395AI just put a script in the /cvs/cds/caltech/scripts/general/netgpibdata/
directory to control the network analyzer
called AG4395A_Run.py .   A section
  
  2728   Mon Mar 29 15:19:33 2010 mevansUpdateGreen Lockingfrequency discriminator for green PLLThanks for the great entry! 
In order to make this work for higher
frequencies, I would add  Hartmut's suggestion
  
  2727   Mon Mar 29 10:40:59 2010 josephbUpdateCamerasGigE camera no work from screen

    
        
  
  2726   Mon Mar 29 02:07:50 2010 KojiSummaryPSLFSS Work from Sunday: Open Loop Gain


   
        
            
  
  2725   Mon Mar 29 01:45:26 2010 daisukeConfigurationGeneralPeriscope version B for green laser ...Here the design of the periscope for the
90 deg steering version is posted.
straight version http://nodus.ligo.caltech.edu:8080/40m/2709
 40m_periscope_B.png40m_periscope_B_100329.pdf40m_periscope_B_dwg_100329.zip 
  2724   Mon Mar 29 01:11:33 2010 ranaSummaryPSLFSS Work from Sunday: RF Out SpectrumI measured the RF spectrum coming out
the FSS RFPD to look for saturations - its
close to the hairy edge. This is with
 rfout.pngTEK00000.PNGTEK00001.PNGTEK00002.PNG 
  2723   Sun Mar 28 23:47:47 2010 ranaSummaryPSLFSS Work from Sunday: Open Loop GainI measured the open loop gain of the FSS
(as usual, I have multiplied the whole OLG
by 10dB to account for the forward loop gain
 fssloop.pngsweep2.png 
  2722   Sun Mar 28 23:17:46 2010 ranaSummaryPSLFSS Work from Sunday: noise specThis is the error point spectrum - it is
filled with huge multiples of ~75 kHz as
Yoichi noticed a couple years ago.
 in2.png 
  2721   Sun Mar 28 20:51:31 2010 ranaSummaryPSLFSS Work from Sunday: Cavity Suspension is Ridiculously Undamped!What
is the Transfer Function of the suspension
 Untitled.png 
  2720   Sun Mar 28 20:05:33 2010 ranaSummaryPSLFSS Work from Sunday: AOM/VCO level set wrongJust before working on the FSS today, I
noticed that the VCO RF output level was
set incorrectly.
 Untitled.png 
  2719   Sun Mar 28 20:00:17 2010 ranaUpdateCamerasGigE camera no work from screenNot that this is an urgent concern, just
a data point which shows that it doesn't
just not work at the sites.
 Untitled.png 
  2718   Sun Mar 28 17:28:26 2010 matt, kiwamuUpdateGreen Lockingfrequency discriminator for green PLLLast Friday, Matt made a frequency discriminator
circuit on a bread board in order
 6x 
  2717   Sat Mar 27 16:23:10 2010 KojiUpdateSUSanother SRM sidemagnet gluedKiwamu and Koji
Last night we have released PRM from
the gluing fixture. All of the six magnets
  
  2716   Fri Mar 26 10:48:35 2010 steveUpdateSAFETYsafety glasses measuredSafety
glasses 1064 nm transmission measured at
~200 mW level. They are all good.
 P1060188.JPGP1060199.JPG 
  2715   Thu Mar 25 17:32:42 2010 AlbertoUpdate40m UpgradingREFL55 UpgradedI upgraded the old REFL199 to the new REFL55.
To do that I had to replace the old
photodiode inside, switching to a 2mm one.
 2010-03-25_REFL55_model_to_meas_comparison.png2010-03-25_REFL55_model_to_meas_comparison.png 
  2714   Thu Mar 25 17:29:48 2010 kiwamu, mottUpdateGreen LockingPLL two NPROsIn this afternoon, Mott and I tried to
find a beat note between two NPROs which
are going to be set onto each end table for
  
  2713   Thu Mar 25 09:07:08 2010 steveUpdatePEMGuralp2 x problem is back

    
        
 grlp2xproblm.jpg 
  2712   Wed Mar 24 15:59:59 2010 kiwamu, mattUpdateGreen Lockingleave PLL lockedMatt checked it in this morning and he
found it's been locked during the night.
 
  
  2711   Wed Mar 24 14:57:21 2010 AlbertoUpdate40m UpgradingREFL11 upgraded 
 Hartmut suggested a possible
explanation for the way the electronics transfer
  
  2710   Wed Mar 24 14:52:02 2010 AlbertoUpdateGreen Lockingtwo NPRO PLL


   
        
            
  
  2709   Wed Mar 24 12:40:25 2010 daisukeConfigurationGeneralPeriscope for green laser delivery from the BSC to PSL tableThe periscope design for beam elevation
of the green beams is posted. The design
for the 90 deg steering version is also coming.
 40m_periscope.png40m_periscope_A_100329.pdf40m_periscope_A_dwg_100329.zip 
  2708   Wed Mar 24 12:38:17 2010 HartmutConfigurationGreen LockingBroadband PD for green PLLModified one of the PD assemblies carrying
a large SI-Diode (~10mm diameter).
Removed elements used for resonant
 SiAmpl.pngSiPhase.png 
  2707   Wed Mar 24 04:22:51 2010 kiwamu, mattUpdateGreen Lockingtwo NPRO PLL Now some pedestals, mirrors and lenses
are left on the PSL table, since we are on
the middle way to construct a PLL setup which
  
  2706   Wed Mar 24 03:58:18 2010 kiwamu, matt, kojiUpdateGreen Lockingleave PLL lockedWe are leaving the PLL as it is locked
in order to see the long term stability.
And we will check the results in early morning
 DSC_1402.JPG 
  2705   Wed Mar 24 02:06:24 2010 KojiUpdateIOOvac envelope has to be sealed as antproof for overnightMatt and Koji:
We closed the light doors of the
chambers.
  
  2704   Tue Mar 23 22:46:43 2010 AlbertoUpdate40m UpgradingREFL11 upgradedI modified REFL11 according to the changes
lsited in this
schematic (see wiki  / Upgrade 09
 2010-03-23_REFL11_model_to_meas_comparison.png 
  2703   Tue Mar 23 18:44:46 2010 MottUpdateABSLPLL reconstructed 
 After realigning and getting
the lock today, I tried to add in the SR785
 NPRO_PLL_freqresp.png 
  2702   Tue Mar 23 15:38:26 2010 AlbertoUpdateelogelog just restarted I found the elog down and I restarted it.
Then, after few seconds it was down
again. Maybe someone else was messing with
  
  2701   Tue Mar 23 10:11:13 2010 steveUpdatePEM small air cond unit failed yesterdayOld control room air condition failed yesterday
around noon. It was blowing 80-85F hot air
for about 2-3 hours at racks 1Y4-7 and the
 20datm.jpg 
  2700   Tue Mar 23 09:55:20 2010 KojiUpdateIOOvac envelope has to be sealed as antproof for overnightRoger.

  
  2699   Tue Mar 23 09:37:36 2010 steveUpdateIOOvac envelope has to be sealed as antproof for overnight


   
        
            
 pc3.JPGpc4.JPG 
  2698   Tue Mar 23 00:31:51 2010 KojiUpdateIOOMC realignedThis is the first touch to the MC mirrors
after the earthquake on 16th.

    I made an aluminum access
 IMG_2346.jpgIMG_2347.jpg 
  2697   Mon Mar 22 23:37:32 2010 MottUpdateABSLPLL reconstructed 
We have managed to lock the PLL to
reasonable stability. The RF input is attenuated
 2010-03-22_23.14.00.jpg2010-03-22_23.24.50.jpg 
  2696   Mon Mar 22 22:11:26 2010 MottUpdateABSLPLL reconstructed 
 It looks like the PLL drifted
alot over the weekend, and we couldn't get
 IMG_0150.JPG 
  2695   Mon Mar 22 16:57:45 2010 josephb,daisuke, alexConfigurationComputersMegatron test points working againWe changed the pointer on /cvs/cds/caltech/target/gds/bin/awgtpman
from
/opt/gds/awgtpman    to
  
  2694   Mon Mar 22 11:37:09 2010 steveUpdatePEMjackhammeringThere was more jackhammering this morning
just about 20 ft north-west of the beamsplitter
chamber, outside.
 jackhammering2.jpg 
  2693   Mon Mar 22 10:07:30 2010 KojiSummaryElectronicsUPDH Box #17: ReadyFor your reference: Voltage noise of LM7815/LM7915
(with no load)
 15V_power_supply.pdf 
  2692   Mon Mar 22 02:03:57 2010 ranaSummaryElectronicsUPDH Box #17: ReadyIt took too long to get this box ready
for action. I implemented all of the changes
that I made on the previous one (#1437).
  
  2691   Sun Mar 21 21:02:39 2010 KojiUpdatePSLEOM waist sizeYou don't need a lengthy code for this. It
is obvious that the spot size at the distance
L is minimum when L =
  
  2690   Sun Mar 21 20:08:20 2010 kiwamu, ranaUpdatePSLEOM wasit sizeWe
are going to set the waist size to 0.1 mm for
 waist.pngwaist.py.zip 
  2689   Sun Mar 21 19:25:29 2010 ranaUpdatePEMGuralp2 centered againFrom this morning, now in calibrated units,
and with the Güralp self noise spec
from the Güralp manual.
 huddlez.png 
  2688   Sat Mar 20 18:34:19 2010 kiwamuSummaryElectronicsRE:advantege of our triple resonant EOMYes, I found it.
Their advantage is that their circuit
is isolated at DC because of the input capacitor.
  
  2687   Fri Mar 19 23:03:41 2010 ranaUpdatePEMGuralp2 centered againI went and double-checked and aligned the
styrofoam cooler at ~5:00 UTC. It was fine,
but we really need a better huddling box.
 huddlez.png 
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