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Entry  Mon Dec 20 10:47:29 2010, Koji, Update, IOO, Plan for closing the vacuum chambers 
    Reply  Mon Dec 20 16:57:58 2010, steve, Update, IOO, checking out & closing the vacuum chambers 
       Reply  Mon Dec 20 23:32:58 2010, kiwamu, Update, IOO, Re:checking out & closing the vacuum chambers 
    Reply  Mon Dec 20 22:56:20 2010, Jenne, Update, IOO, Plan for closing the vacuum chambers 
Message ID: 4076     Entry time: Mon Dec 20 10:47:29 2010     Reply to this: 4077   4078
Author: Koji 
Type: Update 
Category: IOO 
Subject: Plan for closing the vacuum chambers 


  • Place the bars on the in-vac tables to mark the positions of the test mass suspensions. (ITMX/ITMY/ETMX/ETMY)
  • Check the table leveling again (ITMX/ITMY/ETMX/ETMY/BSC)
  • Align the whole interferometer.
  • Check the OPLEV spots by either QPDs or apertures
  • Check the OSEM values (MC1/2/3, BS, PRM, SRM, ITMX, ITMY, ETMX, ETMY)
  • Energize OMC PZTs.
    • We have removed the cards at the back of the HV driver.
    • Insert the card and check the connection.
    • Adjust the DC values at the middle of the range.
      -> They have an internal bias circuit to provide +75V at the outputs. (D060287).
      The actual voltages confirmed.
    • Adjust the physical knobs of the PZTs such that we can see the spots at the OMCR cam
  • If everything is fine, attach the access connector.
  • If still everythig is fine, put the BS heavy door.


- Do the following list for all of the testmass chambers.

  • Check if the OSEMs and the OPLEV are still fine.
  • Inspect the surface of the mirror with a laser pointer or a fiber coupled halogen light.
  • Blow the mirrors by the ionization gun.
  • Inspect the mirror surface again.
  • Move the suspension tower close to the door.
  • Make a single drag-wipe with iso
  • Move the SOS tower at the original place.
  • Check the OSEMs and the OPLEVs. Adjust the alignment.
  • Put the heavy door.

- Start slow pumping

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