EMDM Monolithic suspension development Activity plan Piero Rapagnani Detector meeting

EMDM Three Parallel Tasks 1) Steel wire suspension 2) Fibre wire suspension (new C assembly procedure) 3) Complete monolithic suspension 1)Set-up preparation 2)Delivery of fused silica parts 3)Bonding tests 4)Loss tests 5)Complete monolithic suspension 1)Resistance to shocks 2)Resistance to dust pollution 3)Resistance to humidity 4)Silica Dust Containment 5)Storage 6)Transport

EMDM ) Steel_proto_assembly / /02 New RM prototype (Aluminum,ready) New MAR prototype (PVC arms, ~ready) Dummy MI (Al, black, existing, side flats to be machined,~ready) Wires 200  m (ready) Spacers (Al, to be machined) RM coils (~ready) Mounting (non standard) Assembly check and integration of new marionette and new reaction mass.

EMDM ) Steel_proto_LC / /04 LC setup (Control chain calibration, basic control tests). Remarks: - control-DAQ crate ~ready (ADC config, CCD to be tested !!!) - CD crate to be installed. Test of new marionette and new reaction meas.

EMDM ) Fiber_NewEarOld_preparation (Old design revised, delivered in Feb-08) / /04 Improved mounting tools (optimizing C-tool design). Background activities: - fibre production - fibre tests and systematics - training for EGO support Remarks: - CO 2 laser performance checked and realigned. - bending point measurement machine ready. Assembly feasibility technique preparation.

EMDM ) Fiber_NewEarOld_integration / /05 Unmount Proto_steel suspension. Assembly Dummy Mirror, new_RM, new_MAR, fibres (using specific C-tool developed). Leave 1 week in the assembly frame. Integration and transport in the LC facility. Suspension prototype integration.

EMDM ) Fiber_NewEarOld_LC / /07 TF measurements Control tests Roboustness tests. Suspension prototype Local Control test. 1 st Milestone

EMDM ) Fiber_NewEarNew_preparation (New design, meant to separate welding from bonding, delivered in May-08) / /8 Improvement of the mounting tools. Pieces delivery. Bonding (silicate/water-glass) & losses tests. Suspension parts assembly. Background activities: - fibre production - fibre tests and systematics Assembly feasibility and technique preparation.

EMDM ) Fiber_NewEarNew_assembly_integration / /10 Suspension and roboustness using the assembly frame 1Week (min) stand. assembling using the payload prototype RM, MAR Suspension in the frame 2 nd Milestone

EMDM ) Safety and Transport studies Mar/08 - Feb/09 Infrastructure design Orders Construction Implementation… Completion of the monolithic suspension facility, an open task: hard to delineate methods beyond “conservative and reasonable”. Call for other EGO/Virgo collaborators ????

EMDM ) Best_Fiber_XX_LC / /12 Integration of the best solution found in the LC facility 3 rd Milestone Decision about the destiny of prototype with OldEarNew suspension (if still there). Integration of the NewEarNew suspension (if 2 nd Milestone OK) in the LC facility. TF measurements. Control tests. Roboustness tests.

EMDM Draft of the planning

EMDM ITEMMOTIVATIONPERIOD 1) Steel_proto_assemblyAssembly/check/integration of new marionette and new reaction mass. 2008: 28/01-28/02 2) Steel_proto_LCTest of new MAR and new RM.2008: 01/03-30/04 3) Fiber_NewEarOld_preparation (Old design revised, delivered 02-07) Assembly feasibility and technique preparation. 2008: 11/02-30/04 4) Fiber_NewEarOld_integrationSuspension prototype integration (1 week preliminary suspension on the frame, transportation in LC facilty) 2008: 01/05-31/05 5) Fiber_NewEarOld_LCSuspension prototype dynamical and roboustness tests 2008: 01/06-31/07 6) Fiber_NewEarNew_preparation (New design, meant to separate welding from bonding, deliv. 04/07) Assembly feasibility and technique preparation. Specific bonding tests. 2008: 01/02-31/08 7) Fiber_NewEarNew_assembly/ integration Suspension prototype test in the assembly frame (1 week) 2008: 01/09-31/10 8) Safety and Transport (TBD)Completion of the MS facilityMar/08 - Feb/09 9) Best_Fiber_XX_LCAssembly and test (in vacuum?) of the best solution found 2008: 01/11-31/12

EMDM people Further support ? (from EGO) - more technical support from local workshop and trained for skilled works (e.g. welding) + - infrastructure and safety (already involved, but could be officially appointed) + -operator for routinary production works once (fibres/quality/systematics)

EMDM Present suspension critical parts Fiber handling may induce damages on their surfaces Silicate bonding is strongly stressed by the weldling Welding the fiber on the lower clamp may induce cleaning problems

EMDM New monolithic design FS bar Upper clamp Lower clamp

EMDM New monolithic design - 2 CO 2

EMDM New monolithic design - 3

EMDM Stress distribution

EMDM Reaction mass

EMDM MACHINE Measurement of FS fibres bending length

EMDM MACHINE MEASUREMENT OF THE BEDING POINT: Referred to the tip of the fibre at both the ends Problems during the welding operation OTHER MEASUREMENTS POSSIBLE WITH THE MACHINE First violin mode Vertical bouncing mode Measurement of FS fibres bending length Full characterization on a set of fibres pulled with the CO 2 laser NEXT: valueaccuracy Bending length36.64 mm0.04 mm Violin mode445 Hz1 Hz Bouncing mode6.1 Hz0.1 Hz with respect to the tip

EMDM MACHINE Measurement of FS fibres bending length