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Open discussion: a) moving toward finalization of the ET conceptual design

We need to progress step by step the mirror mass (~150 kg) the material of the bulk (silicon) The fiber material (silicon crystal thin rods/ aluminum /niobium) Coating material choice Coating procedure (standard vs no standard) Optical performances ( total absorption)

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Open discussion: a) moving toward finalization of the ET conceptual design

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  1. We need to progress step by step • the mirror mass (~150 kg) • the material of the bulk (silicon) • The fiber material (silicon crystal thin rods/ aluminum /niobium) • Coating material choice • Coating procedure (standard vs no standard) • Optical performances ( total absorption) • Heat load and working Temperature • Geometry of the last stage suspension • Control strategy and related noise issue • Actuators and local sensing • Upper suspension geometry • Thermal issues along the chain and at the payload interface • Newtonian coupling including the effect at the interface of the last stage Open discussion:a) moving toward finalization of the ET conceptual design

  2. The agenda of the WG2 session in Erice • Main topics • -Suspension upper part • - suspension lower part • - bulk properties • - coating properties • - actuator sensors • - cooling issues • …………………………………

  3. Setting up a calendar for the next meetings The paradigm: we call for meetings in anticoincidence with LVC ( ~ 1month of itme window) Date • November 2009 • February 2010 • April/May 2010 • July 2010 • November 2010 • February 2011 • April/May 2011 • July 2011 • November 2011

  4. Finding the location for new meetings • Jena, Germany • Glasgow, Scotland (?) • Trento/Padova, Italy (?) • Hannover , Germany (?) • CERN, Switzerland (???) /Giessen, (Germany) (???) • Nikhef, Netherland (?) • Lyon, (France) (?) • Napoli, (Italy) (?) • XXXXXXXXXXXXXXXX

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