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Status report on active stabilisation of a linear collider final focus quadrupole mock-up

This document provides a status report on the active stabilisation of a linear collider final focus quadrupole mock-up, including modelling, simulation, measurements, and future prospects.

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Status report on active stabilisation of a linear collider final focus quadrupole mock-up

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  1. Status report on active stabilisation of a linear collider final focus quadrupole mock-up J. Lottin, ESIA Jacques.lottin@univ-savoie.fr

  2. LAViSta Laboratories in Annecy working on VibrationStabilisation Laurent BRUNETTI (100%) Fabien FORMOSA (10%) Jacques LOTTIN (20%) Laurent GIACOBONE Claude GIRARD Fabrice PELTIER Yan BASTIAN Franck CADOUX Catherine ADLOFF (20%) Benoît BOLZON (100%) Nicolas GEFFROY (100%) Andréa JEREMIE (80%) Yannis KARYOTAKIS (40%)

  3. Ground motion Cooling system Air flows Power supply system… Final focus system vibrations Excitation spectrum Structural resonances ( Amplified motions)

  4. Outlines • Modelling & Simulation • - Tools • - Tests • - Comparison • Measurements • - Sensor characteristics • - Ground motion • - Acquisition tools • Feedback loop - Reduced size Mock up - Algorithm - Results • Future prospects - New Mock up design - Simulation of the whole system

  5. Measurements 2 types of sensors :  Seismic sensors :Measurement of the ground velocity  Accelerometers :Measurement of the ground acceleration Non magnetic

  6. Measurements Good coherence between velocity sensors Good coherence between accelerometers 7Hz 100Hz 0.2Hz

  7. Measurements • Home made DAQ based on PXI-4472B ADC from NI • ADC designed for spectral analysis : includes anti-aliasing… • Labview software for data acquisition (our development) • VE13, Guralp, SP400, GSV320, ENDEVCO sensors • Bruel and Kjaer electronics • ADC also designed for spectral analysis, especially for modal analysis • Pulse software for data acquisition (from the company) • VE13, Guralp, SP400, GSV320, ENDEVCO sensors • Less electronic noise and better resolution  Better results with accelerometers at low frequencies (same results with velocity sensors which have a bigger amplitude)  This system has been used to show the current results

  8. 0.6nm 0.2nm 4Hz Measurements Resolution

  9. Modelling & Simulation - SAMCEF - Mode 3: 101 Hz Mode 1: 16 Hz Modal tests on the free-fixed beam • Identify eigenfrequencies • Display mode shapes

  10. Modelling & Simulation Experimental set-up

  11. f1 = 16 Hz f2 = 72 Hz f3 = 97 Hz f4 = 269 Hz f5 = 281 Hz Modelling & Simulation • PULSE FFT Analysis

  12. Modelling & Simulation

  13. Modelling & Simulation

  14. fs(wi) signalrebuilding state feedback fc(wi) observer ys(wi) f actuator Mechanicalpart sensor y(wi) signal processing yc(wi) spectral analysis Active rejection PC + Dacq Board

  15. Algorithm for one frequency : State feedback command rebuilding Actuator State observer Sensor Band-pass filter for the disturbance Signal processing Active rejection

  16. Ethernet network Development PC (host)Matlab + Simulink+ XPC Target Toolboxes Dedicated PC (target)XPC Target Input / Output analog boardTexas Instruments Plant Sample time : 0.0007 s Active rejection

  17. Active rejection Accelerometer(only for monitoring) 2 loudspeakers 2 opposite PZT « steel beam »

  18. Active rejection Resonances of : - beam- support

  19. Active rejection Without rejectionWith rejection

  20. Active rejection Resonances of :- beam- support

  21. Active rejection

  22. MATLAB – Simulink XPC target External perturbation SAMCEF Action of actuators Active Feedback Loop Structure Equations of motion Results from sensors Dynamic Response Future work Simulation of the WHOLE SYSTEM:

  23. 2.5 m 120mm 2mm 80mm Cross Section Future work • New Mock Up : fixed – free beam

  24. Future work • Instrumentation of the beam : sensors &actuators sensors :

  25. Deformation of PZT cells Amplified deformation of the steel shell Future work Actuators Force = 194 N Max. Ampl. = 52 μm Resolution = 0,5 nm 15mm 30 mm

  26. Future work Actuator 18

  27. Future work

  28. LAViSta Laboratories in Annecy working on VibrationStabilisation Laurent BRUNETTI Fabien FORMOSA Jacques LOTTIN Laurent GIACOBONE Claude GIRARD Fabrice PELTIER Yan BASTIAN Franck CADOUX Catherine ADLOFF Benoît BOLZON Nicolas GEFFROY Andréa JEREMIE Yannis KARYOTAKIS

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