SUSPENSION Performance vs. Specs

PASSIVE ATTENUATION IN BAND: OK for AdV

MIRROR HOR. SWING DAMPING “IN VELOCITY”: Ok for Locking in Adv

MIRROR HOR. SWING DAMPING “IN DISPLACEMENT”: Ok for low noise controlbut not when wind !

Factor 30 out

Susp E&S to tune system according to wind and reduce noise

Tiltmeters to read tilt

Piezo to control tilt

Accelerometers & ID (to understand role of longitudinal loop and possible improv.)

Monolithic Legs (Displace resonance and understand role)

Filter Zero (Displace resonance and understand role – preisolator ?)

0-150 mHz

Above ….

SAT

SAT 1 - Tilltmeters (RM2-PISA, Resp: A.Giazotto)

SAT 2 - Piezo (PISA, Resp: F.Frasconi)

SAT 3 - Monolithic Legs (PISA, Resp: F.Frasconi)

SAT 4 - Accelerometers (EGO-PISA, Resp: F.Paoletti) + NAPLES (Ext)

SAT 5 - Filter Zero (PISA, Resp: R.Passaquieti)

R&D Program detailed in SAFE proposal & Susp Electronics Documentation

Signal Recycling is not presently considered in SAT !!

SAT 6 - Suspension Electronics (PISA, Resp: A.Gennai)

See presentations ad Adv Meetings DOCUMENTATION CONCLUDED

SPECS: Fixed (see SAFE Proposal)

STATUS: First test failed (robustness). OK electronic chainFlex-Pivot Supports (15/01) – New Flex Pivot (29/01)

Test of new system (February)

WORKS

SURELY IN ADVANCED(12 Pieces – Scarce Impact)

DOES NOT WORK

ONLY MSC WHEN WIND

SAT 1 - Tiltmeters

SAT 2 - Piezo

STATUS: 3 Piezo on site. Tests will start in April just for lack of manpower

SPECS: Available

SCENARIO: Test plan available – High power supply – validation by 2008:If tiltmeter+piezo OK tilt control tests on SAFE. (If failure only MSC to contrast wind)

SCENARIO: It should work. Understand the necessity of the replacement is partof the R&D programm. If answer is positive massive production.

SPECS & GOAL:Specs not clear, goal to displace resonances above 20 Hz

STATUS: Design & simulation done, Delivering on site 03/07, Mounted on SAFE

SAT 3 – Monolithic Legs

SAT 5 – Filter Zero

STATUS: Cross-checked simulation available (Ruggi & Passaquieti).First result on March to displace resonances at high frequency. First contacts with MSC – Vertical Damping (Vincenzo-Roberto)

SPECS:To be defined. In the meanwhile goals 1) How to displace internal resonance over 20 Hz, 2) Conceptual way for a pre-isolator.

SCENARIO: If we do not need, just a picture of what we have to doIf we need to displace resonance prototype and testsIf we need a pre-isolator stage Serious new R&D will start.

SAT 4 – Accelerometers

STATUS: Measurement plan ready – Start in March – Noise budget in May 08 R&D Naples-Salerno goes on indipendently (comparisons).

SPECS:To be defined (Strong Interaction with MSC)

SCENARIO: After the budget and specs fix plan (12/08). If present acc.are enough no problem, otherwise implement improvements keeping eyes on Naples-Salerno R&D.

SCENARIO: VIRGO + in action, Commissioning will drive improvementsOther tasks: HP supply for piezos, Tiltmeters, Acc Boards.

SAT 6 – SUSP ELECTRONICS

SPECS: See SAFE Document:- Connected to other item R&D succeed :

STATUS: VIRGO+ Upgrading (well known programme)

7

2007-08

2009 2010

MRM

SAFE