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  40m Log, Page 279 of 341  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  8044   Fri Feb 8 20:27:56 2013 KojiUpdateRF SystemMC REFL Photodiode transimpedanceThe comment itself was added by me. 
The difference between the previous
  
  8094   Sat Feb 16 18:32:01 2013 yutaSummaryRF Systemphase tracker: OLTFI measured openloop transfer function of
the phase tracking loop for the first characterization
of phase tracker.
 BEATXFINEPHASE_OLTF.pngBEATYFINEPHASE_OLTF.pngphasetracker.png 
  8199   Thu Feb 28 05:54:54 2013 yutaUpdateRF Systemphase tracker: calibrationI swept the frequency of RF input to the
beatbox to calibrate and check linearity
range of phase tracker.
 ALS-BEATX_FINE_PHASE_OUT.pngALS-BEATY_FINE_PHASE_OUT.png 
  8200   Thu Feb 28 06:51:17 2013 yutaUpdateRF Systemphase tracker: noise levelI measured noise level of the phase tracker
by inputting constant frequency RF signal
from marconi.
 frequencynoise.png 
  8214   Sat Mar 2 20:09:12 2013 yutaUpdateRF Systemphase tracker: DAQ noise limited[Koji, Yuta]

We found that our phase tracker noise
 frequencynoisewhitening.png 
  8485   Wed Apr 24 14:36:06 2013 JenneUpdateRF SystemPD frequency responseI think you have the splitter that splits
the RF signal from the network analyzer in
the wrong place. 
  
  8488   Thu Apr 25 00:59:37 2013 RijuUpdateRF SystemPD frequency response

    

       
            
  
  8499   Fri Apr 26 21:38:06 2013 JenneConfigurationRF SystemPD frequency responseI was sad to see that there wasn't a photo
of the POX situation after the fiber work
was done on Thursday.
 IMG_0498.JPGIMG_0499.JPGIMG_0500.JPG 
  8506   Mon Apr 29 17:26:22 2013 RijuConfigurationRF SystemPD frequency response Today I have rerouted the fibers
on AP table to remove the fiber rolls out
of the AP table.  I removed the fibers
 7x 
  8512   Tue Apr 30 19:39:14 2013 RijuConfigurationRF SystemPD frequency responseToday I have rerouted the fibers on POX
table. The aim was to lay it overhead through
the plastic pipe. A pipe ~50ft (~15.5m) long
 IMG_0511.JPGIMG_0512.JPGIMG_0513.JPGIMG_0514.JPGIMG_0515.JPG 
  8513   Tue Apr 30 21:24:15 2013 JenneConfigurationRF SystemPOX fiber layingNice work.  That was a lot of effort,
but having done it so nicely will definitely
pay off, since it is now much harder to break
  
  8515   Tue Apr 30 23:04:23 2013 JenneConfigurationRF SystemOnly 4 25m cables orderedI have found in the depths of the elog
the (original?) list of fibers and lengths
that were decided upon:  elog
  
  8520   Wed May 1 17:36:26 2013 RijuConfigurationRF SystemPD frequency response Today I routed fiber from 1x16 splitter
to POY table. Manasa helped me doing that.
The fiber(25m) was laid on overhead
 IMG_0517.JPGIMG_0518.JPGIMG_0519.JPG 
  8538   Tue May 7 17:13:30 2013 JenneUpdateRF SystemIdeal PRMI RF frequencyKoji asked me to look at what the ideal
RF modulation frequency is, for just the
PRMI case (no arms).  If we had a perfect
  
  8539   Tue May 7 17:30:28 2013 KojiUpdateRF SystemIdeal PRMI RF frequencyTo change the MC length is not the point.
If we can improve the length sensing
by the intentional shift of the modulation
  
  8573   Tue May 14 19:52:58 2013 RijuConfigurationRF SystemPD frequency response [Eric, Riju, Annalisa]
Today we have cleared up the fiber
spool near AP table. We have put the 1x16
 IMG_0520.JPGIMG_0521.JPG 
  8578   Wed May 15 08:29:28 2013 SteveConfigurationRF Systemfiber protection at splitter box area I positioned the fiber loaded protecting
tubing and anchored them so they can do their
job.
 fiberprotect.jpg 
  7301   Tue Aug 28 18:28:21 2012 janoschMetaphysicsRingdownripples Let's see if the ripples observed
in the MC ringdown can be due to tilt
motion of the mirrors.
  
  7302   Tue Aug 28 19:06:32 2012 KojiMetaphysicsRingdownripples Isn't it just a ringing of the intracavity
power as you shifted the laser frequency
abruptly?
  
  7303   Tue Aug 28 19:21:37 2012 janoschMetaphysicsRingdownripples Hmm. I don't know what ringing really
is. Ok, let's assume it has to
do with the pump... I don't see how
  
  7304   Tue Aug 28 20:23:54 2012 KojiMetaphysicsRingdownripples Laser frequency shift = longitudinal motion
of the mirrors
Ringing: http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-20-24-2463
  
  7305   Wed Aug 29 09:35:03 2012 janoschMetaphysicsRingdownripples 2Ok, so the whole idea that mirror motion
can explain the ripples is nonsense. At least,
when you think off the ringdown with
  
  7330   Fri Aug 31 17:44:21 2012 ManasaUpdateRingdownData

    

       
            
 cum_plot.png 
  57   Fri Nov 2 08:59:30 2007 steveBureaucracySAFETYthe laser is ONThe psl laser is back on !   
  115   Mon Nov 19 14:32:10 2007 steveBureaucracySAFETYgrad student safety trainingJohn Miller and Alberto Stochino has received
the 40m safety bible.
 They still have to read the laser operation
  
  196   Tue Dec 18 16:50:35 2007 tobinUpdateSAFETYuvex laser safety glasses defectiveA few days ago we noticed what appeared to
be a blotched, speckled fracturing of the
coating of the "UVEX" laser safety glasses.
 bad-glasses.jpgbad-glasses-zoom.jpg 
  203   Wed Dec 19 16:40:12 2007 steveUpdateSAFETYlaser safety glasses measuredI measured the coarse transission at 1064nm
 of the 40m safety glasses today.
  
  443   Thu Apr 24 15:57:53 2008 steveConfigurationSAFETYSafety at AP-ISCTI measured the output power of the psl after
the mechanical shutter.
 P1020197.JPGmcrefl3.JPG 
  488   Tue May 20 09:28:42 2008 steveBureaucracySAFETYsafety traning for 40mTara Chalernsongsak, new gradstudent for K.
Libbrecht was introduced to the basics of
the 40m operations.
  
  491   Thu May 22 11:21:45 2008 steveBureaucracySAFETYearly surf sudentCaltech under grad Eric Mintun received the
40m safety training.
Now he has to read and sign SOP of laser
  
  523   Fri Jun 6 15:56:00 2008 steveBureaucracySAFETYYoichi received safety trainingYoichi Aso received 40m specific safety training.   
  539   Wed Jun 18 16:37:54 2008 steve,ranaUpdateSAFETYCO2 test in the east armThe CO2 laser and table are in the east arm
for characterization of the mechanics. We
will not be operating it until we have an
 co2.png 
  552   Mon Jun 23 15:22:04 2008 ranaBureaucracySAFETYLaser Safety Walkthrough today   Walkthrough08.jpg 
  708   Mon Jul 21 15:52:22 2008 steveBureaucracySAFETYfire alarms testThe fire alarm test and evacuation drill was
successfully completed at 13:45 Wednesday,
July 16, 2008
  
  840   Fri Aug 15 14:12:31 2008 steveBureaucracySAFETYsafety glasses required The MOPA shutter is opened,
the PSL enclosure is switched to bypass mode,
manual block removed from PMC,
  
  865   Thu Aug 21 10:24:20 2008 steveConfigurationSAFETYlaser safe mode conditionThe MOPA and PSL shutters are closed.
Manual beam blocks are in place.
Enclosure interlock is enabled.
  
  866   Thu Aug 21 16:28:59 2008 steveConfigurationSAFETYsafety glasses required I just opened the MOPA shutter so PA is warming
up.
  
  942   Thu Sep 11 14:27:53 2008 steveBureaucracySAFETYsafety trainingPeter Kalmus received 40m specific safety
training last week.
  
  1004   Mon Sep 29 11:17:14 2008 steveUpdateSAFETYhorizontal viewports are protected with lexanThe four horizontal viewports of arms are
protected 
by 3/8" thick, 8.5" OD Lexan disk of MR10
  
  1068   Wed Oct 22 16:22:53 2008 steveBureaucracySAFETYCaryn received safety trainingCaryn Polatchi has received 40m safety training
on Monday, Oct 20
  
  1082   Fri Oct 24 11:09:08 2008 steveUpdateSAFETYmore lexan plates under camerasThe MC2, MC3&1 and BSC-SUS cameras were repositioned
somewhat in the 
process of placing lexan disks under neat
  
  1123   Fri Nov 7 16:05:55 2008 steveBureaucracySAFETYinsect killer sprayed at kitchen area !
Bob and I cleaned out the sink area and sprayed
Spectracide's BUG STOP insect killer solution
  
  1243   Thu Jan 22 08:34:10 2009 steveBureaucracySAFETYsafety trainingKakeru received 40m safety training yesterday.

He has no authorization to work alone in
  
  1273   Thu Feb 5 09:12:29 2009 steveBureaucracySAFETYsafety updates & fire alarm testThe fire alarm test was completed at 13:30
yesterday.
 
  
  1280   Fri Feb 6 14:49:31 2009 steveSummarySAFETYlaser inventory
40M Laser Inventory at Feb 05,
2009
 

1, Lightwave PA#102 @ 77,910
  
  1288   Tue Feb 10 10:48:48 2009 steveBureaucracySAFETYsafety glasses scannedAll 40m safety glasses are absorbent.
 
They
were scanned by 180 mW  2mm spot size 
of 1064 nm beam and  their  transmissions
 sgscan1.pngsgscan2.png 
  1319   Wed Feb 18 15:31:38 2009 steveBureaucracySAFETYemergency back-up lights checkedAll
13 exit and  emergency back-up lights
and their batteries were checked.
  
  1332   Mon Feb 23 11:07:01 2009 steveBureaucracySAFETYKiwamu receives safety trainingOsamu and Kiwamu received 40m safety training
on Thursday, Feb 19, 2009
Kiwamu needs Osamu's close supervision
  
  1700   Wed Jun 24 17:08:16 2009 steveBureaucracySAFETYsurf student safetyThe 40m lab specific safety training is
done. The participants were
Stephanie Erickson, Clara Bennett,
  
  1802   Wed Jul 29 11:15:06 2009 steveBureaucracySAFETYKevin receives safety trainingKevin Vigue, our high school summer student
went through the 40m specific safety traning
yesterday.
  
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