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  40m Log, Page 278 of 335  Not logged in ELOG logo
ID Date Authorup Type Category Subject Text Attachments
  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 
  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 
  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 
  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 
  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 
  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 
  2741   Wed Mar 31 12:30:31 2010 ranaUpdateGreen Lockingfrequency counter for green PLLIts a good measurement - you should adjust
the input range of the 620 using the front
panel 'scale' buttons to see how the noise
  
  2750   Thu Apr 1 12:07:22 2010 ranaUpdateGeneralPZT response for the innolightThe Lightwave NPRO   
  2751   Thu Apr 1 15:21:12 2010 ranaUpdateGreen Lockingfrequency counter for green PLL 
  
  2759   Sat Apr 3 11:35:47 2010 ranaConfigurationPSLReference Cavity PD Noise SpectrumThe units on this
plot are completely bogus - we know that
the thermal noise from the resonant part
  
  2764   Mon Apr 5 01:02:07 2010 ranaUpdatePEMGuralp interface box turned offI was
checking into the Guralp situation today.
I put the rubber balls underneath the granite
 Untitled.png 
  2805   Mon Apr 19 05:54:50 2010 ranaConfigurationPSLRC Temperature Servo Turned OFF temporarilyIn order to measure the transfer function
of the RC cavity's foam, I've turned off
the servo so that the room temperature noise
 Untitled.png 
  2806   Mon Apr 19 07:38:07 2010 ranaHowToElectronicsRepair and Calibration of SR560: s/n 59650Frank noticed that this particular SR560
had an offset on the output which was unzeroable
by the usual method of tuning the trim pot
  
  2829   Wed Apr 21 22:11:48 2010 ranaUpdatePSLInnolight 2W Vertical Beam ProfileBack in Gainesville in 1997, I learned
how to do this using the chopper wheel.
  
  2839   Sun Apr 25 02:56:07 2010 ranaUpdateLSCStarted dev of LSC FELSC
Plant Model. That is all. 
  
  2865   Sun May 2 15:38:12 2010 ranaSummarySUSCoil Actuator Balancing and Spot Position 
Oh, but it gets even better: in order
to trust the A2L script in this regard you
  
  2869   Mon May 3 01:16:50 2010 ranaHowToElectronicsMarconi phase noise measurement setup To try the 3-corner hat method
on the Marconis, I started to set up the
 pn.png 
  2873   Mon May 3 17:49:41 2010 ranaConfigurationPSLRC Temperature Servo Turned OFF temporarily


   
        
            
 rct.png 
  2875   Tue May 4 02:28:38 2010 ranaConfigurationPSLRC Temperature Servo Turned OFF temporarily 
 My attempt to passively measure
  
  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 
  2881   Wed May 5 02:37:55 2010 ranaConfigurationPSLRC Temperature Servo Turned OFF temporarily


   
        
            
 Picture_7.png 
  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 
  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
  
  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 
  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


   
        
            
  
  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 
  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
  
  2973   Mon May 24 10:03:14 2010 ranaUpdateLSC40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue. 
 If you have a working 40m Optickle
model, put it in a common place in the SVN,
  
  2974   Mon May 24 11:32:05 2010 ranaUpdateLSC40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue.


   
        
            
 reflRFpowerVsArmLength.png 
  2999   Thu May 27 09:43:50 2010 ranaUpdateGreen Lockingmore details

    

       
            
  
  3002   Thu May 27 23:59:54 2010 ranaUpdatePEMNew Foam Box installedValera
and I put the 2 Guralps and the Ranger onto
the big granite slab and then put the new
 Untitled.png 
  3003   Fri May 28 00:40:53 2010 ranaUpdatePEMDAQ down Although trends are available, I
am unable to get any full data from in the
past (using DTT or DV). I started the FB's
  
  3018   Sun May 30 22:18:49 2010 ranaUpdatePEMGranite slab w/ lead balls is so far a flopThe seismometers showed an increased
noise in the Y-direction when put on top
of the granite slab. By tapping the slab,
  
  3022   Mon May 31 22:52:57 2010 ranaUpdatePEMGranite slab w/ lead balls is so far a flopThis plot shows the noise with the box
on, but no granite. We're still pretty far
off from the Guralp data sheet.
 Untitled.pnghuddlez.pnghuddlez.png 
  3047   Thu Jun 3 22:17:05 2010 ranaUpdatePEMseismometers off of linoleum floor At ~2350 UTC on June 2, the seismometers
were turned off. After the granite slab was
repositioned with the new lead, the Ranger
 Untitled.pnga.pngUntitled.png 
  3050   Fri Jun 4 23:52:57 2010 ranaUpdatePEMseismometers off of linoleum floor   Untitled.pnghuddlez.png 
  3051   Sun Jun 6 04:48:41 2010 ranaUpdateCOCITM01 HR Phase MapWhile trying to set up the SIS-FFT to use
our new ITM phase maps, I noticed that the
surface of our ITMs looks pretty good actually
 itm01hr.png 
  3056   Tue Jun 8 18:39:36 2010 ranaUpdatePEMDAQ down

    
  
  3061   Wed Jun 9 21:05:44 2010 ranaSummaryComputersop540m is not to be usedThis is a reminder (mainly for Steve, who somehow   
  3078   Tue Jun 15 19:24:25 2010 ranaUpdateIOOMode Profile after Mode Matching Telescope


   
        
            
  
  3090   Sat Jun 19 17:31:48 2010 ranaDAQCDSExcess Noise in C1:IOO-MC_DRUM1 fixed by rebootI was getting an excess noise in the C1:IOO-MC_DRUM1
channel - it was a flat spectrum of 10 cts/rHz
  
  3110   Wed Jun 23 23:08:30 2010 ranaConfigurationPSLFSS SLOWDC should be ~-4.0 
  
  3123   Sat Jun 26 05:02:04 2010 ranaHowToSVNSVN woes


   
        
            
  
  3125   Sat Jun 26 21:13:19 2010 ranaSummaryComputer Scripts / ProgramsCOMSOL 4.0 InstallationI've
installed COMSOL 4.0 for 32/64 bit Linux
in /cvs/cds/caltech/apps/linux64/COMSOL40/
It
  
  3129   Mon Jun 28 21:26:05 2010 ranaSummaryCDSCDS adapter board notesThose drawings are an OK start, but its
obvious that things have changed at the 40m
since 2002. We cannot rely on these drawings
  
  3132   Tue Jun 29 10:20:58 2010 ranaUpdateMOPAMOPA is NOT deadNot dead. It just had a HT fault. You can
tell by reading the front panel. Cycling
the power usually fixes this.
  
  3141   Wed Jun 30 00:45:26 2010 ranaUpdateVACslow pumpdown stopped for the nightAs per Steve's instructions, at 12:43 AM,
I used the following steps to stop the pumpdown
until the morning:
  
  3151   Wed Jun 30 23:03:46 2010 ranaConfigurationIOOPower into MC restored to maxKiwamu, Nancy, and I restored the power
into the MC today:

    Changed the 2" dia.
  
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