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  40m Log, Page 229 of 339  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  2040   Fri Oct 2 02:55:07 2009 robUpdateLockingmore progressMore progress with locking tonight, with
initial acquisition and power ramps working. 
The final handoff to RF CARM still needs
  
  2047   Sat Oct 3 14:53:24 2009 robUpdateLockingmore progressLate last night after the ETMY settled
down from the quake I made some more progress
in locking, with the handoff to RF CARM succeeding
  
  2048   Mon Oct 5 02:51:08 2009 robUpdateLockingalmost thereWorking well tonight: the handoff of CARM
to RF (REFL2I), successful reduction of CARM
offset to zero, and transition control of
  
  2056   Tue Oct 6 01:41:20 2009 robUpdateLockingDC Readout Lock acquisition working well tonight. 
Was able to engage CM boost (not superboost)
with bandwidth of ~10kHz.  Also succeeded
  
  2081   Mon Oct 12 17:14:39 2009 robUpdateLockingstabilityLast night, 2+ hour lock, probably broken
by me driving too hard (DARM_EXC).
 transpow.png 
  2092   Wed Oct 14 16:59:37 2009 robUpdateLockingdaytime lockingThe IFO
can now be locked during the daytime. 
  
  2093   Wed Oct 14 23:02:41 2009 ranaUpdateLockingdaytime lockingThis is huge.  a.png 
  2097   Thu Oct 15 09:23:07 2009 steveSummaryLockingnever had it so goodAwesome 5 hrs of locking  Rob!  5hlock.jpg 
  2100   Thu Oct 15 17:12:00 2009 ranaSummaryLockingnever had it so good 
  
  2141   Mon Oct 26 03:57:06 2009 robUpdateLockingbadLock acquisition has gone bad tonight. 
The initial stage works fine, up
through handing off control of CARM to MCL. 
  
  2148   Tue Oct 27 01:45:02 2009 robUpdateLockingMZ[quote] Tonight we also encountered a large
peak in the frequency noise around 485 Hz.
 Changing the MZ lock point (the spot in
  
  2152   Tue Oct 27 18:19:14 2009 robUpdateLockingbad

    
        
 MCF_issue.pngno_MCF_issue.png 
  2154   Wed Oct 28 05:02:28 2009 robUpdateLockingbackLockAcq is back on track, with the full
script working well.  Measurements in
progress.
  
  2162   Thu Oct 29 21:51:07 2009 robUpdateLockingbad

    
        
 itsback.png 
  2163   Fri Oct 30 04:41:37 2009 robUpdateLockingworking againI never actually figured out exactly what
was wrong in entry 2162,
but I managed to circumvent by changing the
  
  2271   Sun Nov 15 18:42:10 2009 AlbertoUpdateLockingInterferometer fully locked for 3331 secondsThis afternoon, I tried to lock the interferometer
again after a few days.
After a couple of failed attempts,
  
  2325   Wed Nov 25 03:05:15 2009 robUpdateLockingMeasured MC length

    
        
  
  2332   Wed Nov 25 14:29:08 2009 robUpdateLockingMeasured MC length--FSS trend

    
        
 FSStrendpowerjump.png 
  2333   Wed Nov 25 15:38:08 2009 robUpdateLockingMeasured MC length

    
        
  
  3072   Sat Jun 12 19:41:04 2010 AlbertoUpdateLocking40m Upgrade Optickle ModelI wrote down the settings according to
which I tuned the optickle model of the 40m
Upgrade.
 optickleIFOworkingpoint.pdf 
  3074   Sun Jun 13 08:28:44 2010 valeraUpdateLocking40m Upgrade Optickle Model In my calculation of the digital
filters of the optical transfer functions
the carrier light is resonant in coupled
  
  3075   Mon Jun 14 07:57:07 2010 albertoUpdateLocking40m Upgrade Optickle Model

    
        
  
  3079   Tue Jun 15 21:28:44 2010 albertoUpdateLocking40m Upgrade Optickle Model


   
        
            
 allTransferFunctions_DARMoff_0.pdfallTransferFunctions_DARM2AS_10pmDARMoffset.pdfJan_DARM2AS.pdf 
  3750   Thu Oct 21 05:51:10 2010 kiwamuUpdateLockingno green beat note Still I didn't see any beat note signals..
 With a help from Suresh, Yuta
  
  3754   Thu Oct 21 15:59:28 2010 kiwamuUpdateLockingno green beat note : detailsLast night I tried searching for a beat
note signal with two different PD trans impedance
 bw.png 
  3763   Fri Oct 22 18:15:21 2010 kiwamuUpdateLockingGreen era: found a green beat note finallyfinally
we found it !
 green_beatnote.jpg 
  3766   Fri Oct 22 21:28:27 2010 AidanUpdateLockingGreen era: found a green beat note finallyNice work!
  
  3771   Sun Oct 24 18:06:35 2010 kiwamuSummaryLockingsetup for green beat   green_beat_note.png 
  3774   Mon Oct 25 02:14:38 2010 KojiSummaryLockingsetup for green beat- What is the actual photocurrent for the
beam1 and beam2? We don't care how much power
do you have before the BS, but care how much
  
  3800   Wed Oct 27 21:33:42 2010 SureshUpdateLockingGreen from the far end re-obtained 
The
mirror which was moved during the mode matching
  
  3804   Thu Oct 28 03:21:35 2010 SureshUpdateLockingAligned the MC2 transmission photodiodeYuta and
Suresh
  
  3843   Tue Nov 2 00:17:01 2010 SureshConfigurationLockingTemporary changes to the Video MuxFiber
coupling 1064 nm light at the end of X arm
This
  
  3859   Thu Nov 4 03:13:46 2010 SureshUpdateLockingFibre coupling 1064nm light at the south-end table[Kiwamu,
Suresh]
We
  
  3865   Thu Nov 4 19:00:57 2010 SureshUpdateLockingFibre coupling 1064nm light at the south-end tableThe Fluke
Visual Fault locator (Visifault) arrived
and I used it to couple 1064nm light into
  
  3866   Thu Nov 4 19:26:51 2010 SureshUpdateLockingChanges to the Video MUX reversedAll the
temporary changes to the video cables and
the video MUX ( 3843
  
  4143   Wed Jan 12 17:22:47 2011 SureshConfigurationLockingMC demod phase adjusted to minimise the I output[Koji, Suresh]
We wanted to check and make sure
that the relative phase of the two inputs
 TEK00000.PNG 
  4155   Fri Jan 14 12:29:57 2011 KojiUpdateLockingNext steps for the greenThese are the next steps for a better operation
of the arm locking. They are suitable for
the day time activities
  
  4161   Sun Jan 16 02:20:59 2011 SureshUpdateLockingcomparing the PSL with the X-end-NPRO through the green beatObjective:
      We
wish to study the coherence of the two NPROs
 P1160510.JPGP1160511.JPGP1160515.JPGP1160516.JPG 
  4166   Wed Jan 19 03:37:30 2011 SureshUpdateLockingcomparing the PSL with the X-end-NPRO through the green beat 
 
 [Kiwamu, Suresh]
 Phase_noise_in_digital_frequency_dividers.pdf 
  4177   Thu Jan 20 15:39:59 2011 AidanUpdateLockingUpper limit on frequency noise of ADC[Aidan, Kiwamu]
Kiwamu and I plugged the output from
a DS3456 function generator into the ADC
 Sine-wave-width-test_of_ADC.pdf 
  4178   Thu Jan 20 17:00:39 2011 AidanConfigurationLockingBallpark figures for Green Locking PLLs (Digital vs Analogue)If we use a digital PLL for locking the
frequency of the PSL and END green lasers
then we can expect a UGF of around 1kHz (assuming
  
  4182   Fri Jan 21 11:45:01 2011 AidanConfigurationLockingBallpark figures for Green Locking PLLs (Digital vs Analogue)

    

       
            
  
  4822   Wed Jun 15 02:20:00 2011 JenneUpdateLockingMICH noise budget?I would like to announce my confusion with  MICH_noise_budget_measurements_15June2011.jpg 
  4823   Wed Jun 15 12:16:37 2011 JamieUpdateLockingMICH noise budget?

    
        
  
  4893   Tue Jun 28 02:11:47 2011 JenneUpdateLockingLatest MICH noise budgetI have measured / calculated the latest
MICH noise budget.  It doesn't really
look all that stellar.
 MICH_noise_budget_as_of_28June2011.png 
  5035   Tue Jul 26 03:15:52 2011 JenneUpdateLockingLatest MICH noise budget[Jenne, Rana]
We had another look at the MICH noise
budget tonight. Rana has verified that my
 MICHnoise_shotNoise_25July2011.pdfMICH_darkNoise_whiteningGainChanging_25July2011.pdf 
  5051   Thu Jul 28 02:33:04 2011 JenneUpdateLockingYarm flashing, but not yet lockedBecause I'm too lazy to write a cohenrent
elog right now, here's my notes that I wrote
while working tonight:
  
  5233   Sun Aug 14 20:04:40 2011 Keiko, Anamaria, Jenne, and KiwamuSummaryLockingcentral part ifo locking planGOAL : To lock the central part of ifo

Here is the plan:
  
  5243   Mon Aug 15 21:43:29 2011 Anamaria and KeikoSummaryLockingcentral part ifo locking project REFL33 and REFL165 cables were connected
from the AP table to the rack.  Cables
on the rack for REFL33I, 33Q, 165I, 165Q
  
  6421   Thu Mar 15 04:04:23 2012 KojiConfigurationLockingPRC Matching issuesKiwamu and Koji
We found that the intra-cavity mode
of the PRC is not round although it was obvious
 P3150910.jpgP3150902.jpgP3150906.jpgP3150907.jpgP3150900.jpg 
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