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  40m Log, Page 146 of 344  Not logged in ELOG logo
ID Dateup Author Type Category Subject Text Attachments
  7298   Tue Aug 28 17:43:04 2012 JenneUpdatePSLPower reduced!

    

       
            
  
  7299   Tue Aug 28 17:51:39 2012 JenneUpdatePSLPBS and Half Wave plates introduced

    

       
            
  
  7300   Tue Aug 28 17:59:03 2012 JenneUpdateVACVENT: GO!I have turned of the high voltage supplies
for PZT1 and PZT2.  The OMC PZT high
voltage supplies were already off, since
  
  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
  
  7306   Wed Aug 29 11:47:21 2012 ericqUpdateVACVenting [Steve, Eric]
I've been helping Steve vent this
morning. The following things were done (from
  
  7307   Wed Aug 29 12:46:49 2012 SteveUpdateVACVent completed in 4 hrs 
 vent72.pngbeforeVentOpl.pngbeforeVent.png 
  7308   Wed Aug 29 17:02:41 2012 ericqUpdatePSLPower reduced!

    

       
            
  
  7309   Wed Aug 29 17:09:57 2012 jamieUpdateSUSETMX OK, free swingingETMX appears to be fine.  It was stuck
to its OSEMs in the usual way.  I touched
it and it dislodged and is now swinging freely. 
 Screenshot.png 
  7310   Wed Aug 29 17:35:34 2012 KojiUpdatePSLPower reduced!The biggest reason why we could not lock
the MC was that the beam was not properly hitting
  
  7311   Wed Aug 29 19:28:41 2012 Elli KingUpdateLSCSetup for a cavity scan or the input mode cleaner Riju, Elli
Today we prepared
our experimental setup to take a cavity scan
 40m_cavity_scan_diagram.jpg 
  7312   Wed Aug 29 20:43:23 2012 KojiUpdateIOOSetup for a cavity scan or the input mode cleanerThe technique is based on detection of
the beating between the resonant carrier
and a resonant higher order mode.
  
  7313   Wed Aug 29 21:02:45 2012 JenneUpdateIOOOptics between Faraday and PRM are centered, realigned[Jenne, Suresh, with support from Jamie
and Koji]
MC spots measured, MC1, MC3 no change.
  
  7314   Thu Aug 30 00:08:34 2012 jamieUpdateGeneralIn vac plans for tomorrow, 8/30

    

       
            
  
  7315   Thu Aug 30 08:12:39 2012 SteveUpdateGeneralIn vac plans for tomorrow, 8/30 
 1,PRM spot can be viewed directly
from the window south-east of ITMX chamber. 
  
  7316   Thu Aug 30 08:37:11 2012 SteveUpdateSUSETMX and ITMX needs more attention

    

       
            
 after4.1mAtm.pngeq4.1mAtm.png 
  7317   Thu Aug 30 12:01:27 2012 janosch, Manasa,SteveUpdate ETMXWe have done some work at ETMX today. We
installed the baffle and placed two
mirrors on the table.
  
  7318   Thu Aug 30 13:10:41 2012 jamieUpdateCamerasETMX

    

       
            
 etmx-face-baffle.png 
  7319   Thu Aug 30 17:03:32 2012 janosch, Manasa, SteveUpdate ETMXThe baffle has been moved away from ETMX
towards the edge of the table (in fact, it
is a little beyond the edge). It is also
  
  7320   Thu Aug 30 18:01:05 2012 ElliUpdateIOOSetting up Input MC cavity scan measurementRiju, Elli
Today tried to take our first cavity
scan.  We unplugged the 55MHz sideband
  
  7321   Thu Aug 30 19:08:08 2012 JenneUpdateVACDogs on BS, ITM chambers checkedI tightened as many of the dog clamps on
the bottom of the BS, ITMX and ITMY chambers
as I could find.  I used a torque wrench
  
  7322   Thu Aug 30 20:20:52 2012 JenneUpdateSUSWatek camera placed on SE viewport of ITMX to look at PRM[EricQ, Jenne]
We placed the Watek camera on the
SE viewport of the ITMX chamber, and focused
  
  7323   Thu Aug 30 20:31:35 2012 JenneUpdateIOOPZT1 and PZT2 set to center of their ranges[Koji, Jenne]
Jamie and Koji pointed out that we
need to be doing the in-vac alignment with
  
  7324   Thu Aug 30 20:35:09 2012 jamieUpdateSUStarget installed on PRM, temporary earthquake stops in placeWe installed beam targets on PRM and BS
suspension cages.
On both suspensions one of the screw
  
  7325   Fri Aug 31 07:32:49 2012 SteveUpdateSUStarget for BS

    

       
            
  
  7326   Fri Aug 31 10:16:02 2012 janosch, SteveUpdate ETMX, scattering prepsThe alignment of the pick-off mirror near
ETMX is done. Everything turned out to be
easy once we realized that there is no sense getting
 IMG_1609.JPGIMG_1608b.jpg 
  7327   Fri Aug 31 10:24:36 2012 SteveUpdateVACchamber dog clamps checked

    

       
            
  
  7328   Fri Aug 31 13:22:29 2012 ElliUpdateIOOCorrecting improper termination of the 55MHz input to the EOMKoji, Riju, Elli
This morning Koji discovered that
the 55MHz input into the RF combiner that
  
  7329   Fri Aug 31 17:26:54 2012 SteveUpdateGeneralBS cameraSteve and Eric
Placed pick up mirror for BS face
and PRM back. I will ask Jamie to clamp it.
 BS_PRM.png 
  7330   Fri Aug 31 17:44:21 2012 ManasaUpdateRingdownData

    

       
            
 cum_plot.png 
  7331   Fri Aug 31 17:50:41 2012 SteveUpdateSUSSOS centering targetThe SOS centering target is 1.9 mm lower than it should
be!  
  
  7332   Fri Aug 31 18:32:47 2012 KojiUpdateIOOCorrecting improper termination of the 55MHz input to the EOM 
The power switch of the frequency
source was mechanically broken. I replace
  
  7333   Tue Sep 4 10:29:41 2012 SteveUpdateSUSPRM damping restored    
  7334   Tue Sep 4 11:32:58 2012 JenneUpdateLockingFriday in-vac workElog re: Friday's work
Adjusted PZT2 so we're hitting the
center of PR2. 
  
  7335   Tue Sep 4 13:31:55 2012 JenneUpdateGeneralThe PlanWe need a plan for the rest of the week. 
I want to be closing the heavy doors on Friday
at the latest.  Please add to / comment
  
  7336   Tue Sep 4 13:44:17 2012 ManasaUpdateGeneralThe Plan

    

       
            
  
  7337   Tue Sep 4 13:50:26 2012 ericqUpdatePSLPMC Realigned, power adjusted I adjusted the PMC alignment this
morning, brought the transmission up to 0.83V.
After the lunch meeting, we found
  
  7338   Tue Sep 4 20:03:38 2012 JenneUpdateGeneralin-vac progressOpened ETMY, beam was high and to the right
(if you look at the face of ETMY). 
Tried walking beam up, since just doing PZT2
  
  7339   Tue Sep 4 20:06:04 2012 JenneUpdateLockingMC scan input switched to the 11MHz port of EOMSince the EOM's signal combiner (splitter
backwards) is frequency-independent, Koji
and Jamie (in the proper turn off, turn on
  
  7340   Tue Sep 4 20:13:46 2012 JenneUpdateGeneralThe Plan - Tues evening version Tues
* Hit center of ETMY, using input
optics, PR3.
  
  7341   Tue Sep 4 20:20:47 2012 jamieUpdateGeneralproblematic tip-tilts

    

       
            
  
  7342   Tue Sep 4 20:25:22 2012 jamieOmnistructureVACbetter in-air "lite" access connector neededWe really need something better to replace
the access connector when we're at air. 
This tin foil tunnel crap is dumb. 
  
  7343   Wed Sep 5 09:50:25 2012 SteveOmnistructureVACbetter in-air "lite" access connector needed

    

       
            
 IMG_1612.JPG 
  7344   Wed Sep 5 10:50:15 2012 jamieOmnistructureVACbetter in-air "lite" access connector needed

    

       
            
  
  7345   Wed Sep 5 13:11:43 2012 jamieOmnistructureVACbetter in-air "lite" access connector needed

    

       
            
  
  7346   Wed Sep 5 19:29:45 2012 JenneUpdateGeneralYarm aligned to IR incident beam[EricQ, Jenne, brains of other people]
Checked at ETMY that the pointing
hadn't changed a whole lot.  Jamie and
  
  7347   Thu Sep 6 02:51:47 2012 KojiUpdateGeneralGreen beam roughtly aligned (Re: Yarm aligned to IR incident beam)The Y-End green beam was roughly aligned
by the steering mirrors for the green beam.
I couldn't understand the Y-End green
 green_y.png 
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