Minutes of WP3 telecon, Jun 1st 2012

- Participants
 (sorry, I forgot to take the attendance.)

- Scope of WP3
 * Infrastructure shall be an important scope of ELiTES.
 * French group is not a part of ELiTES but we shall ask them
   to join the activity by the next telecon.

- Contamination control
 * There are lessons learned at 1G detectors.
 * LIGO has a real-time monitor of contamination control.
 * Suspension adjustment is to be done with HEPA turned off
   and contamination of optics can be an issue.
 * On ET side, LMA is in charge of the cleanliness of optics.

- Vibration isolation of cryo-coolers
 * N.Kimura has been working on this for long on the KAGRA side.
 * The cryo-cooler vibration has been measured in Rome and
   Pisa, but results from KAGRA (CLIO) are important as the
   measurement is done with an interferometer
 * There are multiple solutions for the isolation.
 * Study of residual noise of active systems (ex compressors)
   is important.

- Cooling/Heating time reduction
 * Fulvio and Paola are experts on the ET side.
 * Helium gas cooling idea etc.
 * Discussion at GWADW 2011 with Warren Johnson
 * Fulvio will explain the problem with the actual KAGRA setup

- Scattering light control
 * This also belongs to WP2.
 * There are lessons learned from 1G detectors about baffles.
 * Cooling of baffles is a new issue for ET/KAGRA.

- Exchange lectures
 * Plan to extend the last year's lecture exchange.