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ID Date Author Type Categorydown Subject Text Attachments
  1315   Mon Feb 16 23:09:52 2009 ranaUpdateElectronicsMC Servo Board offset gone bad!The attached plot shows that someone broke
the MC_SUM_MON channel around 10:30 AM this
past Wednesday the 11th. This is the EPICS
 mcoff.png 
  1326   Thu Feb 19 22:40:33 2009 KiwamuUpdateElectronicsPSL angle QPDI checked a broken QPD, which was placed
for PSL angle monitor, and finally I cocluded
one segment of the quadrant diode was
  
  1345   Mon Mar 2 16:27:40 2009 AlbertoConfigurationElectronicsMC Drum Mode SR560 Preamplifier ReplacedToday I checked out the SR560 around the
lab. I confirmed that the one with the label
"channel A noisy" is effectively
  
  1407   Mon Mar 16 15:19:52 2009 OsamuDAQElectronicsSR785I borrowed SR785 to measure AA, AI noise
and TF.
  
  1445   Mon Mar 30 15:51:27 2009 steveUpdateElectronicsHP4291A left the lab to be repairedEric Gustafson is handling the old HP4291A
rehabilitation. Tarac picked both units up
today.
  
  1476   Sun Apr 12 19:31:43 2009 ranaSummaryElectronicsAmphony 2500 HeadphonesWe bought the Amphony 2500 Digital Wireless
headphones recently. The other cheapo headphones
we have are OK for control room use, but
  
  1664   Wed Jun 10 01:52:34 2009 AlbertoUpdateElectronicsMC length and Marconis' frequenciesPete, Rob, Alberto,
yesterday we thought that some of
the problems we were having in locking the
  
  1681   Tue Jun 16 20:03:41 2009 AlbertoUpdateElectronicsRequirements on Wenzel MultiplierFor
the 40m Upgrade, we plan to 
 SummaryOfResult.pdf 
  1724   Wed Jul 8 18:46:56 2009 DmassAoGElectronicsBeam Scan FunkyThe beam scan (which has been living in
the bridge subbasement for a bit now) is
in a state of imperfection.
 beamscanhead3.pngbeamscanhead6.png 
  2014   Mon Sep 28 23:13:14 2009 JenneConfigurationElectronicsRob is breaking stuff....Koji and I were looking for an extender
card to aid with MZ board testing. 
Rob went off on a quest to find one. 
  
  2019   Tue Sep 29 16:14:44 2009 robConfigurationElectronicsRob is breaking stuff....


   
        
            
  
  2064   Wed Oct 7 11:18:40 2009 kiwamuSummaryElectronicsracks of electronics 
I took the pictures of all racks
of electronics yesterday, and then uploaded
  
  2110   Sun Oct 18 19:55:45 2009 ranaConfigurationElectronicsIP POS is back: ND filter gone, new resistors inIts back in and re-centered. Our
next move on IPPOS should be to replace its
steering mirror with something bigger and
 IMG_0068.JPGIMG_0072.JPG 
  2112   Sun Oct 18 22:06:15 2009 ranaConfigurationElectronicsIP POS is back: ND filter gone, new resistors inI tried to compare the IP_POS time series
with the IPANG and MC_TRANS but was foiled
at first:
 Untitled.png 
  2118   Mon Oct 19 14:48:15 2009 rana, robSummaryElectronicspiezo jena measuring boxAttached is the schematic of the Piezo Jena
driver measuring box made in a Pomona box:
 PA160153.JPGPA160151.JPG 
  2244   Wed Nov 11 20:57:06 2009 kiwamuUpdateElectronicsMulti-resonant EOM --- LC tank circuit ---I have been working about multi-resonant
EOM since last week.
In order to characterize the behavior
 DSCN0160.JPGLCtank_complete.png 
  2262   Fri Nov 13 03:38:47 2009 kiwamuUpdateElectronicsmulti-resonant EOM --- impedance of LC tank circuit ----I have measured the impedance of the LC
tank circuit which I referred on my
last entry.
 LCtank_impedance.pngLCtank_model.png 
  2263   Fri Nov 13 05:03:09 2009 kiwamuUpdateElectronicsmulti-resonant EOM --- input impedance of LC tank ----I measured the input impedance of the
LC tank circuit with the transformer. The
 input_impedance.pnginput_impedance2.png 
  2286   Tue Nov 17 21:10:35 2009 ranaSummaryElectronicsBusby Low Noise Box: Photos and Upgrades   IMG_0217.JPGbusby-noise.png 
  2288   Wed Nov 18 00:38:33 2009 ranaSummaryElectronicsVoltage Noise of the SR560's OUTPUTs (the back panel)I've
measured the voltage noise of the SR560's
lead acid battery outputs; they're not so
 sr560.png 
  2292   Wed Nov 18 14:55:59 2009 kiwamuUpdateElectronicsmulti-resonant EOM --- circuit design ----The circuit design of multi-resonant EOM
have proceeded.
By using numerical
 whole_circuit.pngdesigned.pngmont.png 
  2294   Wed Nov 18 16:58:36 2009 kiwamuUpdateElectronicsmulti-resonant EOM --- EOM characterization ---In designing the whole circuit it is better
to know the characteristic of the EOM.
I made impedance measurement with
 EOM_impedance.png 
  2295   Wed Nov 18 22:38:17 2009 KojiUpdateElectronicsmulti-resonant EOM --- EOM characterization ---How can I get those values from the figure?

  
  2340   Wed Nov 25 20:44:48 2009 kiwamuUpdateElectronicsMulti-resonant EOM --- Q-factor ----Now I am studying about the behavior of
the Q-factor in the resonant circuit because
the Q-factor of the circuit directly determine
 trans.pngeq1.pngimpedance.pngeq2.png 
  2341   Thu Nov 26 02:08:34 2009 KojiUpdateElectronicsMulti-resonant EOM --- Q-factor ----The key point of the story is:
"The
  
  2403   Sat Dec 12 07:36:56 2009 ranaHowToElectronicsHow to Measure the Length of a Cable: InterferometryNeed to measure the length   
  2436   Mon Dec 21 01:14:08 2009 ranaSummaryElectronicsNoise measurement of the Rai Weiss FET preamp box I shorted the input to the box and
then put its output into the SR560 (low noise,
G = 100, AC). I put the output of the SR560
 IMG_0242.JPGPicture_2.pngRWnoise.png 
  2450   Thu Dec 24 01:25:29 2009 kiwamuUpdateElectronicsimpedance analyzingThe
validation for high impedance measurement
has been well done. 
 DSCN0421.JPGEOM.png 
  2454   Sun Dec 27 23:44:59 2009 ranaUpdateElectronicsMCT QPD investigation


   
        
            
  
  2455   Mon Dec 28 01:17:01 2009 KojiUpdateElectronicsMCT QPD investigationUnfortunately, the signals for individual
segments also suffer from the voltage drop
as all of the low impedance amplifiers are
  
  2476   Tue Jan 5 09:18:38 2010 AlbertoOmnistructureElectronicsUniversal PDH Box Stored in the RF CabinetFYI: I stored the Universal PDH boxes in
the RF cabiner in the Y arm.
  
  2523   Mon Jan 18 23:44:19 2010 kiwamuUpdateElectronicstriple resonant circuit for EOMThe first
design of the triple resonant EOM circuit
 whole_circuit.pngdesigned_circuit.png 
  2524   Tue Jan 19 00:10:44 2010 ranaUpdateElectronicstriple resonant circuit for EOMVery cool.     
  2525   Tue Jan 19 02:39:57 2010 kiwamuUpdateElectronicsdesign complete --- triple resonant circuit for EOM ---The design
of the triple resonant circuit has been fixed.
 realistic.pngscaling.png 
  2526   Tue Jan 19 02:40:38 2010 KojiUpdateElectronicstriple resonant circuit for EOMThe design looks very good. I have some
questions.
1. As far as I remember, you've
  
  2527   Tue Jan 19 03:04:14 2010 KojiUpdateElectronicstriple resonant circuit for EOMSelf-follow:
I got the answer of Q3 from the follow-up
entry.
  
  2528   Tue Jan 19 03:20:28 2010 KojiUpdateElectronicsdesign complete --- triple resonant circuit for EOM ---First I was confused, but now I think I
understood.
My confusion: 
  
  2529   Tue Jan 19 03:27:47 2010 kiwamuUpdateElectronicsRe: triple resonant circuit for EOM1. You are right, the gain for the
single resonant circuit was about 9.3 in
my measurement.
  
  2533   Tue Jan 19 23:26:07 2010 kiwamuUpdateElectronicsRe:Re: triple resonant circuit for EOM


   
        
            
 matching_edit.pngeq1.pngdesigned_response.png 
  2586   Wed Feb 10 17:28:02 2010 kiwamuUpdateElectronicstriple resonant EOM ---- preliminary resultI have made a
prototype circuit of the triple resonant
 mod_depth.png 
  2587   Wed Feb 10 23:15:37 2010 KojiUpdateElectronicstriple resonant EOM ---- preliminary resultHey, this looks nice, but can you provide
us the comparison of rad/V with the resonant
EOM of New Focus?
  
  2590   Thu Feb 11 16:52:53 2010 kiwamuUpdateElectronicstriple resonant EOM ---- preliminary resultThe commercial resonant EOM of New Focus
has the modulation efficiency of 
  
  2596   Fri Feb 12 13:15:41 2010 kiwamuUpdateElectronicstriple resonant EOM --- liniaryity test
I have
measured the linearity of our triple resonant
 linearity_edit.png 
  2602   Sat Feb 13 13:21:53 2010 KojiUpdateElectronicstriple resonant EOM --- liniaryity testLooks good. I just thought of the idea
that we also can use Alberto's PLL setup
to sense the modulation with more sensitivity. 
  
  2682   Thu Mar 18 15:33:17 2010 kiwamuSummaryElectronicsadvantege of our triple resonant EOMIn
this LVC meeting I discussed about triple
resonant EOMs with Volker who was a main
 electrode.png 
  2683   Thu Mar 18 19:00:04 2010 KojiSummaryElectronicsadvantege of our triple resonant EOMDid you find what is the merit of their
impedance matching technique?

  
  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.
  
  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).
  
  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 
  2745   Wed Mar 31 19:29:58 2010 HartmutUpdateElectronics(1cm-) Si PD transfer functions updateRecorded transfer functions for the 1cm
Si-PD as described on p. 2708
for different biases. I put the plots
  
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