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Monolithic suspension development

Activity planPiero Rapagnani

Detector meeting 30-01-2008

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Tests on new payload Development and implementation of New Ear Design Safety and Transport Studies

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

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1) Steel_proto_assembly 2008

28/01 - 28/02

• 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.

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2) Steel_proto_LC 2008

01/03 - 30/04

• 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.

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3) Fiber_NewEarOld_preparation

(Old design revised, delivered in Feb-08)

2008 11/02 - 30/04

• Improved mounting tools (optimizing C-tool design).• Background activities: - fibre production - fibre tests and systematics

- training for EGO support

Remarks: - CO2 laser performance checked and realigned. - bending point measurement machine ready.

Assembly feasibility technique preparation.

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4) Fiber_NewEarOld_integration2008

01/05 - 31/05

• 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.

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5) Fiber_NewEarOld_LC2008

01/06 - 31/07

• TF measurements• Control tests• Roboustness tests.

Suspension prototype Local Control test.

1st Milestone

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6) Fiber_NewEarNew_preparation(New design, meant to separate

weldingfrom bonding, delivered in May-08)

200801/02 - 31/8

• 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.

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7) Fiber_NewEarNew_assembly_integration

200801/09 - 31/10

• Suspension and roboustness using the assembly frame

• 1Week (min) stand.• assembling using the payload prototype RM, MAR

Suspension in the frame

2nd Milestone

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8) 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 ????

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9) Best_Fiber_XX_LC2008

01/11 - 31/12

Integration of the best solution found in the LC facility

3rd Milestone

• Decision about the destiny of prototype with OldEarNew suspension (if still there).

• Integration of the NewEarNew suspension (if 2nd Milestone OK) in the LC facility.

• TF measurements.• Control tests.• Roboustness tests.

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Draft of the planning

2008

1 Steel_Proto_Assembly

2 Steel_Proto_LC

3 Fiber_NewEarOld_preparation

4 Fiber_NewEarOld_integration

5 Fiber_NewEarOld_LC

6 Fiber_NewEarNew_preparation

7 Fiber_NewEarNew_assembly_integ

8 Safety and Transport studies

9 Best_Fiber_XX_LC

Sept Oct Nov DecMay June July AugJan Feb Mar Apr

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ITEM MOTIVATION PERIOD

1) Steel_proto_assembly Assembly/check/integration of new marionette and new reaction mass.

2008: 28/01-28/02

2) Steel_proto_LC Test 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_integration

Suspension prototype integration (1 week preliminary suspension on the frame, transportation in LC facilty)

2008: 01/05-31/05

5) Fiber_NewEarOld_LC Suspension 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 facility

Mar/08 - Feb/09

9) Best_Fiber_XX_LC Assembly and test (in vacuum?) of the best solution found

2008: 01/11-31/12

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Name Institution R=item responsible, E=direct engagement, C=collaborator

Geppo Cagnoli INFN-FI Res/C Roberto Cavalieri EGO Eng/C Ludovico Carbone INFN-PG Res/ R Shourov Chatterji INFN-RM1 Res/E Mauro Ciaccafava INFN-RM Tech/C Massimo Fabiani INFN-RM Tech/E Lucio Farnesini INFN-PG Tech/E Alberto Gennai INFN-PI Eng/C Dominique Huet EGO Res/ R Matteo Lorenzini INFN-FI Res/E Giovanni Losurdo INFN-FI Res/C Ettore Majorana INFN-RM Res/E Filippo Martelli INFN-FI Res/ R Alain Masserot CNRS-LAPP Eng/E Maurizio Perciballi INFN-RM Tech/R Francesco Piergiovanni INFN-FI Res/E Antonfranco Piluso INFN-PG Tech/C Paola Puppo INFN-RM Res/ R Piero Rapagnani INFN-RM Res/ R Alessandro Rizzo INFN-RM Tech/E Daniel Sentenac EGO Eng/E Helios Vocca INFN-PG Res/ R

peopleFurther 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)

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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

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New monolithic design

FS bar

Upper clamp

Lower clamp

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New monolithic design - 2

CO2

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New monolithic design - 3

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Stress distribution

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Reaction mass

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MACHINEMeasurement of FS fibres bending length

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MACHINE

MEASUREMENT OF THE BEDING POINT:• Referred to the tip of the fibre at both the ends

• Problems during the welding operationOTHER 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 CO2 laserNEXT:

value accuracy

Bending length 36.64 mm 0.04 mm

Violin mode 445 Hz 1 Hz

Bouncing mode 6.1 Hz 0.1 Hz

with respect to the tip

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MACHINEMeasurement of FS fibres bending length