SIMPLIFIED MODELS OF ILD AND SID DETECTORS: SIMULATIONS

AND SCALED TEST BENCH

@ ULB: Christophe Collette, David Tschilumba, Lionel Fueyo-Rosa

@ SLAC: Marco Oriunno, Thomas Markiewicz, Kirk Bertsche

christophe.collette@cern.ch

C. Collette, LCWS 12 (October 25, 2012)

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CLIC final focus

C. Collette, LCWS 12 (October 25, 2012)

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CMS Experiment (LHC tunnel)

[C. Collette et al. “Control strategies for the final focus of future linear particle collider” Nuclear Instruments and Methods in Physics Research Section A Vol. 684 (August 2012), pp. 7-17]

C. Collette, LCWS 12 (October 25, 2012)

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Simplified model

Cantilever support

Random force

C. Collette, LCWS 12 (October 25, 2012)

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Model of the technical noise

PSD of the random force F

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Solutions tested

1. Isolation

2. Damping 3. Stiffening

C. Collette, LCWS 12 (October 25, 2012)

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Example of results

seismometer

C. Collette, LCWS 12 (October 25, 2012)

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C. Collette, LCWS 12 (October 25, 2012)

Finite element model (Full scale)9

Resonances frequencies multiplied by 2

Active tendon

C. Collette, LCWS 12 (October 25, 2012)

Numerical results

Avantages :

Stiffness

Active damping

Alignment

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C. Collette, LCWS 12 (October 25, 2012)

Scaled test bench (in production)11

Resonances frequencies multiplied by 2

Active tendon:

APA100M+BK8200

Active tendon

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C. Collette, LCWS 12 (October 25, 2012)

Experimental set-up

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C. Collette, LCWS 12 (October 25, 2012)

Divided by 30

Positioning:out of phase sinusoidal signals in the two vertical actuators:

Amplitude: 30 µmFrequency: 30 Hz

Active damping of all the modes

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2

3

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C. Collette, LCWS 12 (October 25, 2012)

Simplified model of the SiD

Additional features: QD0s and QF1s Detector tilt Beam dynamics Soil model Technical noise model

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C. Collette, LCWS 12 (October 25, 2012)

Simplified model of the SiD

QF1 QD0 QD0 QF1

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C. Collette, LCWS 12 (October 25, 2012)

Simulations

Integrated RMS of the random force

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C. Collette, LCWS 12 (October 25, 2012)

Ground motion measurement at SLAC

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C. Collette, LCWS 12 (October 25, 2012)

Power spectral densities

Without technical noise With technical noise

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C. Collette, LCWS 12 (October 25, 2012)

Integrated RMS

Without technical noise With technical noise

QF1s play a big role; Technical noise is not very harmful

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C. Collette, LCWS 12 (October 25, 2012)

Conclusions

Simplified model of the CLIC_ILD final focus, updated with

ground motion model from CMS

Proposal of active tie rods:

Improve the robustness to technical noise

Active structural damping

Positioning

Results validated on a scaled test bench

Simplified model of the SiD detector

QF1 plays a big role

Technical noise is not very harmful

Future work: Passive and active isolation of the QF1 and QD0