40m QIL Cryo_Lab CTN SUS_Lab CAML OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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Entry  Thu Apr 7 17:50:16 2011, Frank, HowTo, Vacuum, torque for CF flanges cf_torque2.pdf
    Reply  Sat Aug 24 15:42:54 2013, tara, DailyProgress, Vacuum, pumping down the chamber 
       Reply  Thu Aug 29 13:25:49 2013, tara, DailyProgress, Vacuum, pumping down the chamber 
Message ID: 1313     Entry time: Sat Aug 24 15:42:54 2013     In reply to: 568     Reply to this: 1319
Author: tara 
Type: DailyProgress 
Category: Vacuum 
Subject: pumping down the chamber 

I closed the chamber. The turbo pump is on and pumping down.

 I realigned the beams so the visibilities for both cavities were 80% or more. This made sure that the beams' path would be close to the optimized path.

Now, the window reflection won't overlap with the cavity reflection, and can be dumped properly.

Note about a few things to do:

  • The beam holes on the foam might have to be fixed, the beams slightly clip at the openings. I have to check if the beams are clipped at the periscope or not.
  • modification of the seismic stack as suggested by Koji. The teflon pieces at the bottom plate are not screwed down to the stack making it hard to put the stack in the chamber. I think this should be fixed after the SiO2/Ta2O5 measurement is done and we have to reopen/ installed AlGaAs cavities.
  • There is some strayed beam from the PBS in RCAV path. This is from left over beam in S-light that reflected off, and bounced back at the PBS surface before going to the PD. This might have to be fixed too.

FYI for torque wrench setting for CTN cavity:



 The CTN cavity is 10" OD,  the Torque required is 190 InchPound.

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