40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log, Page 58 of 341  Not logged in ELOG logo
ID Date Author Typeup Category Subject Text Attachments
  9537   Wed Jan 8 13:01:48 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signalsI
ran a simulation of a double cavity with
a PRC length mismatched w.r.t. the modulation
 REFL_vs_PRClength.pdf 
  9539   Wed Jan 8 16:08:52 2014 ericqSummaryLSCEffect of PRC length mismatch on error signals [ericq,Gabriele]
So, we want an relatively quick measurement
of the PRC length error (with sign!) at the
 phaseVlength.pdf 
  9541   Wed Jan 8 19:05:30 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signals [Gabriele,
EricQ]
 
 as11.pngas55.png 
  9544   Thu Jan 9 17:58:31 2014 ericqSummaryLSCEffect of PRC length mismatch on error signals[ericq, Gabriele, Manasa]
 We wanted to perform the PRC
length measurement today with an AS11 signal,
  
  9546   Fri Jan 10 15:31:07 2014 ranaSummaryLSCEffect of PRC length mismatch on error signals 
 Its very doubtful that the
MC yaw drift matters for the IFO. That's
  
  9548   Sun Jan 12 09:57:24 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signals

    

       
            
  
  9551   Mon Jan 13 19:31:04 2014 GabrieleSummaryLSCPRMI locking[Gabriele, EricQ]
We wanted to try the PRC length measurement,but
we ended up spending all the afternoon to
  
  9554   Tue Jan 14 19:05:48 2014 GabrieleSummaryLSCPRMI locked on sideband[Gabriele, EricQ] 
Finally, we managed to lock PRMI
on sidebands:
  
  9555   Tue Jan 14 19:10:51 2014 GabrieleSummaryLSCPRC length measurement [EricQ, Gabriele]
We could carry out the measurement
of PRC length. The AS110 photodiode was plugged
  
  9557   Wed Jan 15 18:18:15 2014 GabrieleSummaryLSCPRC length measurement analysis I analyzed the data we took yesterday,
both using AS11 and AS55. For each value
of the phase I estimated the Q/P ratio using
 experimental_data_as11.pdfexperimental_data_as55.pdfsimulation_phase_difference.pdf 
  9561   Fri Jan 17 11:44:25 2014 GabrieleSummaryLSCMore length measurements, more confusion I analyzed the data taken yesterday. 
The AS11 data in PRMI configuration
is very bad, while the AS55 seems good enough:
 results_as11.pdfresults_as55.pdf 
  9562   Tue Jan 21 17:26:59 2014 JenneSummaryVACRebooted RGA computer and reset RGA settings[Jenne, Steve]
Steve noticed that the RGA was not
logging data and that not all the correct
  
  9565   Wed Jan 22 15:24:11 2014 SteveSummaryVACRga scan after reboot

    

       
            
 Rgascan169dwarmingup.pngBlankMedmMustBeFixed.png 
  9585   Wed Jan 29 16:36:37 2014 KojiSummaryGeneralHigh power beam blasting of the aLIGO RFPD [Rich, Jay, Koji]
We blasted the aLIGO RF PD with a
1W IR beam. We did not find any obvious damage.
  
  9586   Wed Jan 29 21:01:03 2014 GabrieleSummaryLSCPRC length measurement analysis [Manasa,
EricQ, Gabriele]
We
 map.pdfscript.zip 
  9588   Thu Jan 30 19:00:25 2014 GabrieleSummaryLSCPRC length changed [Manasa,
EricQ, Gabriele]
Today
 map_jan30.pdfsurvey_v3_jan30.m 
  9590   Fri Jan 31 19:29:36 2014 GabrieleSummaryLSCPRC and SRC lengths Today we measured the missing distance
to reconstruct SRC length.
I also changed the way the mirror
 map_jan31st.pdfsurvey_v3.zip 
  9613   Fri Feb 7 17:52:41 2014 KojiSummaryGeneralSome cleaning up
    Adjusted the PMC alignment

   Adjusted the IMC length offsets for
the MC servo and the FSS servo
   
  
  9634   Thu Feb 13 19:36:36 2014 KojiSummaryLSCPRM 2nd/4th violin filter addedJenne and I noticed high pitch sound from
our acoustic interferometer noise diagnostic
system.
  
  9667   Mon Feb 24 23:43:10 2014 ranaSummaryGeneralToDo1) Fixup REFL165: remove ND filters, get
box for PD, dump diode reflections, put less
light on diode, change DC transimpedance
  
  9674   Tue Feb 25 18:16:22 2014 JenneSummaryLSCEven more violin filtersA new violin mode at 1303 Hz was ringing
up this afternoon.  Rana and I added
a notch for this.
 PRMvio2.png 
  9687   Mon Mar 3 22:21:43 2014 KojiSummaryLSCPRMIsb locked with REFL165I&QSuccessful
PRMIsb locking with REFL165I/Q
My
  
  9691   Wed Mar 5 11:33:10 2014 KojiSummaryLSC2 arm ALS->LSC transition - road mapStep by step description of transition
from 2arm ALS to Common/Differential LSC
for FPMI
  
  9694   Wed Mar 5 19:15:39 2014 JenneSummaryLSCALS offset moving script modified

    

       
            
  
  9698   Thu Mar 6 11:15:32 2014 KojiSummaryLSCStuck at step 2You don't need to make transition from
ALS X/Y to ALS C/D. Just stabilize the arms
with ALS C/D from the beginning.
  
  9708   Mon Mar 10 21:12:30 2014 KojiSummaryLSCComposite Error Signal for ARms (1)The ALS error (i.e. phase tracker output)
is linear everywhere, but noisy. 
The 1/sqrt(TR) is linear and less
 composite_linear_signal.nb.zip 
  9709   Mon Mar 10 21:13:43 2014 nicolasSummaryLSC Composite Error Signal for ARms (2)In order to better understand how the composite
signal would behave in the presence of noise,
I decided to do a simple analysis of the
 rawsigs.pngerrorsigs.pngoptimalweights.pngcompositenoise.png 
  9710   Mon Mar 10 21:14:58 2014 ericqSummaryLSCComposite Error Signal for ARms (3)Using Koji's mathematica notebook, and
Nic's python work, I set out to run a time
domain simulation of the error signal, with
 model.pngsimSweep.pdfalsSweep.pdf 
  9711   Mon Mar 10 21:16:13 2014 KojiSummaryLSCComposite Error Signal for ARms (4) The LSC model was modified for CESAR.
A block called ALSX_COMBINE was made
in the LSC block. This block receives the
 ss1.pngss2.pngCESAR_OFFSETS.pdf 
  9712   Mon Mar 10 21:16:56 2014 KojiSummaryLSCComposite Error Signal for ARms (5) After making the CDS modification, CESAR
was tested with ALS.
First of all, we run CESAR with threshold
  
  9713   Tue Mar 11 14:49:01 2014 KojiSummaryLSCImportant notice on the XARM servoThe nominal gain
of the XARM for the POX11 error signal is
  
  9715   Tue Mar 11 15:14:34 2014 denSummaryLSCComposite Error Signal for ARms (1)

    

       
            
  
  9717   Tue Mar 11 15:21:08 2014 KojiSummaryLSCComposite Error Signal for ARms (1)True. But we first want to realize this
for a single arm, then move onto the two
arms case. 
  
  9731   Mon Mar 17 12:02:55 2014 KojiSummaryGeneralIFO recovery / confirmed ETMX in troubleI
confirmed that we need to vent the chambers.
 MCspots.png 
  9733   Mon Mar 17 20:14:34 2014 KojiSummaryGeneralIFO recovery / confirmed ETMX in troubleI tried to take the photos of the magnets
from outside.  So far most suspicious was
LL. 
 ETMX_UL.JPGETMX_UR.JPGETMX_LR.JPGETMX_LL.JPG 
  9739   Tue Mar 18 21:19:22 2014 KojiSummaryIOOMC spot positions checkedMC spot sposition script was ran
/opt/rtcds/caltech/c1/scripts/ASS/MC/mcassMCdecenter
 MCASS.png 
  9740   Wed Mar 19 21:37:45 2014 manasaSummaryLSCAttempt to lock PRMIsb with REFL165I&QI tried to
repeat Koji's PRMI lock using REFL165I/Q.
I was not able to lock PRMI stably. All I
  
  9751   Wed Mar 26 11:16:59 2014 ericqSummaryLSCComposite Error Signal for ARms (3)Extending the previous model, I've closed
a rudimentary CESAR loop in simulink. Error
signals with varying noise levels are combined
 simlink.pdfsimulatedCESARLock.pdf 
  9753   Wed Mar 26 14:54:32 2014 KojiSummaryLSCPRMIsb locked with REFL165I&Q again[Manasa, Eric, Koji]
PRMIsb
was locked with REFL165I&Q.
  
  9754   Wed Mar 26 21:51:42 2014 ericqSummaryLSCPRMIsb locked with REFL165I&Q againIncidentally, while messing around with
transfer functions and sensing matrix elements
this evening, I was able to sideband lock
  
  9758   Fri Mar 28 17:22:55 2014 KojiSummaryLSCPRMIsb locked with REFL165I&Q againWhile I'm looking at the PRM ASC servo
model, I tried to use the current servo
filters for the ASC 
  
  9759   Fri Mar 28 20:23:02 2014 ranaSummaryIOOMC2 movedI aligned MC2 suspension by 0.01 in pit
and yaw to align the MC better to the PSL
beam. Then I turned the WFS back on. The
  
  9764   Mon Mar 31 11:34:00 2014 manasaSummaryIOOMC2 moved

    

       
            
  
  9765   Mon Mar 31 13:15:55 2014 manasaSummaryLSCAlignment update

    

       
            
  
  9767   Mon Mar 31 17:47:57 2014 ericqSummaryLSCMICH sensing oddities in REFL 3FLast week, while I had the PRMI locked
on REFL33, I did some poking around with
mirror excitation to RFPD quadrature transfer
 REFL_33_traj.pdfREFL_165_traj.pdf 
  9768   Mon Mar 31 21:23:30 2014 GabrieleSummaryLSCMICH sensing oddities in REFL 3F

    

       
            
  
  9769   Mon Mar 31 23:57:22 2014 KojiSummaryASCPRM ASC characterization / designA
series of measurements / calculations for
the PRM ASC characterization and servo design
 7x 
  9772   Tue Apr 1 21:45:01 2014 JenneSummaryLSCPRM violin notch not at correct freq?Koji and I have the PRMI locked right now,
and we hear a very strong violin mode ringing
up, at 628Hz.  This is, according to
  
  9773   Tue Apr 1 22:03:44 2014 KojiSummaryASCNew PRM ASC is running[Koji Jenne]
New PRM ASC was implemented. [to
be cnt'd]
  
  9777   Wed Apr 2 19:50:12 2014 KojiSummaryASCNew PRM ASC is runningAs the designed ASC filters in this
entry had too little phase margins (~10deg),
I had to compromise the servo design.
  
ELOG V3.1.3-