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ID Date Author Type Categorydown Subject Text Attachments
  2761   Sat Apr 3 19:54:19 2010 AlbertoUpdate40m UpgradingREFL11 and REFL55 PDs Noise SpectrumThese are the dark noise spectrum that
I measured on the 11MHz and 55MHz PD prototypes
I modified.
 2010-04-03_REFL11_darknoise.png2010-04-03_REFL55_darknoise.png 
  2767   Mon Apr 5 10:23:40 2010 AlbertoUpdate40m UpgradingREFL11 Low Frequency Oscilaltion ReducedAfter adding an inductor L=100uH and a
resistor R=10Ohm in parallel after the OP547A
opamp that provide the bias for the photodiode
 2010_04_05_REFL11_darknoise_with_100uH_coil_10ohm_res.png2010_04_05_REFL11_darknoise_wide_freq_window_lid_open-closed.png2010_04_05_REFL11_darknoise_wide_freq_window_lid_open-closed.png 
  2782   Thu Apr 8 10:17:52 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs PhotocurrentFrom the measurements of the 11 MHz RFPD
at 11Mhz I estimated a transimpedance of
about 750 Ohms. (See attached plot.)
 2010_04_05_REFL11_ShotnoiseVsPhotocurrent.png 
  2783   Thu Apr 8 10:24:33 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
  
  2784   Thu Apr 8 20:53:13 2010 KojiUpdate40m UpgradingREFL11 Noise Vs PhotocurrentSomething must be wrong. 
1. Physical Unit is wrong for the
second term of "Vn = Vdn + Sqrt(2 e
  
  2785   Fri Apr 9 06:45:28 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
  
  2789   Mon Apr 12 16:20:05 2010 AlbertoConfiguration40m UpgradingREFL55 improvedDuring the commissioning of the AS55
PD, I learned how to get a much better rejection
of the 11MHz modulation.
So I
 2010-04-12_REFL55_TF_model_to_meas_comparison.png 
  2790   Mon Apr 12 17:09:30 2010 AlbertoUpdate40m UpgradingREFL11 Noise Vs Photocurrent


   
        
            
 2010-04-09_REFL11NoiseMeasurements.png 
  2795   Mon Apr 12 22:44:30 2010 KojiUpdate40m UpgradingREFL11 Noise Vs PhotocurrentData looks perfect ... but the fitting
was wrong.
Vn = Vdn + Z * sqrt( 2 e Idc )
  
  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 
  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 
  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?

  
  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
  
  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 
  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 
  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
  
  2957   Thu May 20 12:34:46 2010 kiwamuConfiguration40m Upgradingoptical breadboards with legsYesterday Steve and I revived two legs
to mount some optical breadboards outside
of the end table.
 leg1_small.pngleg2_small.png 
  2966   Fri May 21 11:56:34 2010 AlbertoUpdate40m Upgrading40mUpgrade Field Power and RF Power Spectrum at the ports. 38m/38.55m arm length issue.I update my old 40mUpgrade Optickle model,
by adding the latest updates in the optical
layout (mirror distances, main optics transmissivities,
 7x 
  2994   Wed May 26 17:10:09 2010 AlbertoUpdate40m UpgradingRF Generation boxThis is how the RF generation box might
soon look like:
 Visio-frequencyGenerationBox_wiringSchematic.png 
  2996   Wed May 26 22:22:03 2010 AlbertoConfiguration40m UpgradingArm cavity lengthThe second sideband is resonant in the
arms for a cavity length of 37.9299m.
The nearest antiresonant arm lengths
 reflRFpowerVsArmLength_3658m.pngreflRFpowerVsArmLength_3750m.png 
  3001   Thu May 27 12:52:02 2010 AlbertoUpdate40m UpgradingArm lengths
For both sidebands to be antiresonant
in the arms, the first modulation frequency
  
  3012   Fri May 28 21:32:32 2010 AlbertoUpdate40m UpgradingMC alignment[Alberto, Kiwamu, Kevin, Rana]
Today we tried to measured the beam
shape after the MC MMT1 that Jenne installed
  
  3023   Tue Jun 1 06:30:38 2010 KojiConfiguration40m Upgradingeffect of the arm length I checked the effect of the arm length
to the reflectance of the f2(=5*f1) sidebands.
Conclusion: If we choose L_arm
 arm_cavity1.pngarm_cavity2.pngarm_cavity.nb.zip 
  3094   Mon Jun 21 18:01:34 2010 JenneUpdate40m UpgradingSRM, PRM hung, magnets inspected[Jenne, Kiwamu, Rana, Eric Gustafson]
The SRM and PRM have been re-hung,
and are ready for installation into the chambers. 
  
  3099   Tue Jun 22 20:07:08 2010 JenneUpdate40m UpgradingFirst attempt at Tip Tilt hanging[Jenne, Steve, Nancy, Gopal]
We
made an attempt at hanging some of the Tip
 2_ECDs_small.jpgMagnetStickingOutFar_small.jpg 
  3329   Fri Jul 30 02:54:04 2010 KojiUpdate40m UpgradingMore optics installed on the BS tableJuly 29 Thu [Steve, Alberto, Kiwamu,
Koji]
We
  
  3332   Fri Jul 30 12:46:38 2010 KojiConfiguration40m UpgradingBS chamber status   BS_layout_Jul_29_2010.png 
  4214   Thu Jan 27 21:10:47 2011 OsamuUpdate40m UpgradingCalibrated noise of greenI calibrated noise spectrum of green lock.
1. Measurement of conversion factor
of ADC input from V to ct:
 20110127_Calibrated_grrennoise.pdf20110127_Calibrated_grrennoise.jpg20110127_TF_ETMXSUSEXC_to_PZTOUT.pdf 
  5696   Wed Oct 19 12:25:58 2011 SureshUpdate40m UpgradingActive Tiptilts from LLO moved to clean shelf along X armI have moved the active tip tilts that
we brought over from LLO to the Clean Bureau
along the X arm (closest to the ETMX). There
  
  5697   Wed Oct 19 13:45:11 2011 SureshUpdate40m UpgradingActive Tiptilts from LLO moved to clean shelf along X armI have moved the active tip tilts that
we brought over from LLO to the Clean Bureau
along the X arm (closest to the ETMX). There
  
  7090   Mon Aug 6 11:07:06 2012 ManasaUpdate40m UpgradingOptical layout updatedACAD files of the 40m optical layout have
been updated as per the vent in Aug 2011.
Files are available at the 40m svn
  
  7125   Wed Aug 8 20:51:56 2012 ManasaUpdate40m UpgradingOptical layout updated

    

       
            
  
  7222   Fri Aug 17 18:49:55 2012 ManasaUpdate40m UpgradingOptical layout updated

    

       
            
  
  7245   Tue Aug 21 18:23:58 2012 ManasaUpdate40m UpgradingETMX table layoutOptical layout of the current endtable
at ETMX has been updated in the svn repository
(directory: 40M_Optical Layout). This layout
  
  7354   Thu Sep 6 19:21:58 2012 ManasaConfiguration40m UpgradingBaffle problemFor the current baffle (dia. 40mm) centered
along the beamline place at 1.77" from
the test mass, the baffle will allow ~8.6mm
 bfl.png 
  7359   Fri Sep 7 11:58:12 2012 ManasaConfiguration40m UpgradingBaffle problem

    

       
            
 bfl.png 
  7361   Fri Sep 7 13:01:53 2012 ManasaConfiguration40m UpgradingBaffle problem

    

       
            
 Picture1.png 
  7449   Thu Sep 27 19:03:06 2012 ManasaUpdate40m UpgradingNew ETMX layout - Version 1.0 I am working towards redesigning
the endtables. I've attached the first version
of the layout. As per Steve's comment I've
 ETMX_OldNew.png 
  7450   Thu Sep 27 20:05:57 2012 KojiUpdate40m UpgradingNew ETMX layout - Version 1.01. I wonder how the mode profiling/matching
was considered in the new layout.

I can see the distances between the
  
  7451   Fri Sep 28 07:49:30 2012 SteveUpdate40m UpgradingNew ETMX layout - Version 1.0  Where is IP-ANG ? It is good
practice to use two mirrors at launching
and detecting the beam, so you can walk it
  
  7704   Tue Nov 13 11:30:54 2012 ManasaConfiguration40m UpgradingEndtable upgrade for auxiliary green laserI'm set on the mission to get the new bigger endtables setup  ETMX_sch.png 
  7705   Tue Nov 13 16:18:51 2012 ManasaConfiguration40m UpgradingEndtable upgrade for auxiliary green laser : Circularize the 1W NPRO beam profileWith reference to measurements made earlier: elog, 
Beam parameters for Innolight 1W
  
  7706   Tue Nov 13 20:13:07 2012 KojiConfiguration40m UpgradingEndtable upgrade for auxiliary green laser : Circularize the 1W NPRO beam profileThese fs are too short.


  
  7726   Mon Nov 19 20:03:53 2012 ManasaConfiguration40m UpgradingEndtable upgrade for auxiliary green laser : ETMX layout on new tableI have attached the possible layout of
the optics on the new ETMX endtable. More
optics have been added when compared to the
 ETMX_endtable_New_Model.pdf 
  7727   Mon Nov 19 20:17:53 2012 JenneConfiguration40m UpgradingEndtable upgrade for auxiliary green laser : ETMX layout on new table 
For convenience, I would include
a steering mirror in front of the TRX PD. 
  
  7728   Mon Nov 19 22:42:14 2012 KojiConfiguration40m UpgradingEndtable upgrade for auxiliary green laser : ETMX layout on new table
    I don't like the idea to
place the cylindrical lenses right in front
of the laser. 
  
  7813   Wed Dec 12 11:04:45 2012 ManasaConfiguration40m UpgradingEndtable upgrade for auxiliary green laser : ETMX layout on new tableI have updated the layout to fix all the
issues brought up. The last couple of 2"
green steering mirrors will hold the PZTs
 ETMX_endtable_New_Model.png 
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