1. Fulvio Ricci Cascina, November, 24th 2008
ET- WP2 start-up
Fulvio Ricci
Cascina, November, 24th 2008

2. the legacy of the R&D ILIAS – Strega project
WP2 - Mission
Pave the road to get the sensitivity of a GW detector as near as
possible to 1 Hz, by seismic and thermal noise
Passive and active seismic attenuation
Low dissipation materials for mirror suspensions
Cryogenics: safety and noise compatibility in the underground environment
Its starting point:
the legacy of the R&D ILIAS – Strega project

3. The Prototype of Cryogenic Payload installed at the EGO West hall @1
The Prototype of Cryogenic Payload installed at the EGO West km

4. Tasks and involved Groups
Definition of substrates and coating properties at low temperature:
Groups: LMA, Glasgow, INFN- Firenze/Urbino, INFN-Genova, INFN-Perugia, INFN-Padova/Trento………
Science team: Jena, Trieste………
Design of Upper Suspensions:
Groups: INFN-Pisa, EGO………
Design of Lower Suspension Mechanics:
Groups: INFN- Roma1,INFN-Firenze, INFN-Perugia, INFN-Pisa, Glasgow…….
Design of Cooling System:
Groups: INFN- Roma1, INFN-Roma2……..
Science Team: ICRR –Japan (TBC)………
Design of Lower Suspension Sensing and Actuation:
Groups: INFN-Roma2, INFN-Napoli, INFN-Padova/Trento, INFN-Roma1……
Science Team: Genova……..
Design of Lower Suspension Fibers:
Groups: Glasgow, INFN-Firenze/Urbino, INFN-Perugia, INFN-Pisa………

5. WP2 – Task Coordination
Definition of substrates and coating properties at low  temperature
( R. Flaminio , R. Nawrodt, F. Vetrano)
 Design of Upper Suspensions
(TBD)
 Design of Lower Suspension Mechanics
(P. Puppo, F. Travasso)
 Design of Cooling System and impact on vacuum
(F. Ricci, E. Coccia)
Design of Lower Suspension Sensing and Actuation
(V. Fafone, R. De Rosa, P. Falferi, E. Majorana)
Design of Lower Suspension Fibers
(S. Rowan, M. Tonelli)

6. Thermal Noise Requirements for the Suspensions of the 3rd Gen ITF - Task ID 18
Material Intrinsic losses requirements at low temperatures
Seismic Attenuation Requirements of the suspension (100 days – M15)
Suspension seismic attenuation requirements (input from site selection)
Identification of control strategy and optimal mode frequencies for suspension elements
Preliminary Conceptual Design of the overall Cryogenic Suspension (360 days – M24)
Active vs. Passive Super Attenuator (4 Months)
Upper Suspension preliminary Design:
Conceptual design of damping, alignment and control strategy (12 Months)
Cryogenic compatibility of Upper Suspension Design (12 Months)
Last Stage Suspension Preliminary Design (300 days - M24)
Test Mass Requirements (3 Months – M13)
Test Mass Definition (4 Months – M23)
Suspension Wires material and size choice (Input from Material Selection)
Definition of last stage actuation strategy and technology
Cooling Requirements and Cooling Strategy definition (360 days - M26)
Thermal Path definition and Thermal Links Requirements (6 Months - M21)
Thermal Links Conceptual design (6 Months – M26)
Finalization of the Conceptual Design of the Overall Cryogenic Suspension
Month 1-33
Month 1-12
Month 1-15
Month 10-26
Month 12-26
Month 10-24
Month 10-26
Month 26-33

7. Activity organization of the WP2:
Monthly phone/video meetings
Quarterly Face-to-Face Meetings of the WG2 group
Brief report with activity highlights sent to the entire ET list following each quarterly meeting
Meetings open to the entire ET community
Milestone-December 2008 : First ET internal report

8. Participants:
1 - EGO (FRA-ITA)
2 - INFN (ITA)
3 - MPG (DEU)
4 - CNRS (FRA)
5 - University of Birmingham (UK)
6 - University of Glasgow (UK)
7 - VU (NL)
8 - University of Cardiff (UK)
+ Science Team