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QD0 stabilization

QD0 stabilization. L. Brunetti 1 , B. Aimard 1 , J.-P. Baud 1 , G. Balik 1 , G. Deleglise 1 , A. Jeremie 1 , S. Vilalte 1 B. Caron 2 , C. Hernandez 2 , (LAViSta Team) 1 : LAPP-IN2P3-CNRS, Université de Savoie, Annecy, France &

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QD0 stabilization

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  1. QD0 stabilization L. Brunetti1, B. Aimard1, J.-P. Baud1, G. Balik1 , G. Deleglise1, A. Jeremie1, S. Vilalte1 B. Caron2, C. Hernandez2, (LAViSta Team) 1: LAPP-IN2P3-CNRS, Université de Savoie,Annecy, France& 2: SYMME-POLYTECH Annecy-Chambéry, Université de Savoie, Annecy, France

  2. Transfer on a real scale • Demonstration active table to QD0 active control ? 0,6 nm RMS@4Hz One active foot Several active feet • Mecatronics challenge • Structure : QD0 Magnet • Sensors • Actuators • Integration: control, data processing, real time… Schedule : CLIC development phase 2014-06-13 MDI QD0 Stabilisation 2

  3. Sensor • Comparison with Guralp and Wilcoxon: Demonstration sensor • Efficient • Approach validated → patent • Next stage : miniaturization 2014-06-13 MDI QD0 Stabilisation

  4. Sensor • Comparison with Guralp and Wilcoxon: Miniaturized sensor • 2 units have be machined • Still efficient • Control : Accelerometer LAPP sensor Geophone 6T Geophone 3ESP 2014-06-13 MDI QD0 Stabilisation

  5. Sensor • Has to be optimized vs drift, repetitivity, tolerance/sensitivity and one spurious frequency. • Last version, more “industrial” (intermediary prototype vs performances) • Drift: thermal analysis and tests were performed. Problem identified. Study in progress. • Tolerances and tuning are improved → sensitivity x 1,5. The solution will be adapted for the next version. • Spurious frequency : in progress… • Repetitivity: better • New version will be machined • Low cost version • Development of our own electronics and of our own sensitive part… • Valorisation - dissemination 2014-06-13 MDI QD0 Stabilisation

  6. Structure • Objectives: • Modal analysis of short QD0 in order to adapt the simulation of QD0 • Design and simulation of a dummy QD0 to machine a new test bench • Integration of the PZT actuators in the simulation to develop the control laws • Control of this short QD0 2014-06-13 MDI QD0 Stabilisation

  7. Comparison experimental tests and theoretical results… • Clamped magnet: - Experimental analysis - 2nd flexion mode vs y axe 1st torsion mode 2nd flexion mode vs x axe 1st flexion mode vs y axe 1st flexion mode vs x axe 2014-06-13 MDI QD0 Stabilisation

  8. Comparison experimental tests and theoretical results… • Free - free magnet: • Why are there so many differences? • Matter of the 2 blue U, new simulation will be done… • Problem of boundary conditions • In progress: • Control of this short QD0 on our active foot. • New magnet clamping in progress 2014-06-13 MDI QD0 Stabilisation

  9. Design of a dummy structure… • Design and machining of a dummy structure: • Avalaibility to design a dummy structure even if the mode has to be corrected. • Has to be adapted after the short QD0 study will be corrected. • Integration of the PZT actuators in the state space model for the control. 2014-06-13 MDI QD0 Stabilisation

  10. Actuator • No commercial solution for dynamics, resolution, load, stiffness… • Two challenging ways : internal development or industrial partnership… • Industrial solution : PZT actuator • Foreseen collaboration: SYMME, G2Elab, CEDRAT Technologies and LAPP • ANR (French agency) submitted (for 2 years). Pre-proposal ok, final report mid-July… Example of an large actuator Small size PZT actuator • Specifications and tests vs ANR Conceptual views of the future tests benches • The ANR decision is a strategic step for the future of the project… 2014-06-13 MDI QD0 Stabilisation

  11. Conclusion vs QD0 stabilization • Sensor: • A first innovative version has demonstrated the feasibility : performances are about the same as Guralp 6T. • 2 miniaturized versions with our own electronics : still almost the same performance, but small adjustments have to be made (tuning, drift...) • Promising results in control • A “more industrial” version allows to adjust some aspects • A new version will be done. • Advantages: adapted to control, cost, size • Future: sensitivity to magnetic field and tests on an experimental site: first at CERN (stabilization group), then ATF2, CLIC module or CLEX… • Structure: • Analysis has to be corrected… • Actuator: • Partnerships identified and the strategy chosen • ANR decision in July 2014-06-13 MDI QD0 Stabilisation

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