3: ISI ASCR, Brno University of Technology, Brno, Czech Republic

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3: ISI ASCR, Brno University of Technology, Brno, Czech Republic CLIC QD0 Stabilization G. Balik1, B. Aimard, J.-P. Baud1, L. Brunetti1, A. Dominjon, A. Jeremie1, M. Serluca1 B. Caron2 Z. Buchta3 (LAViSta Team: Laboratoires d’Annecy-le-Vieux de Vibration & Stabilization) 1: LAPP-IN2P3-CNRS, Université Savoie-Mont-Blanc, Annecy, France 2: SYMME, POLYTECH Annecy-Chambéry, Université Savoie-Mont-Blanc, Annecy France 3: ISI ASCR, Brno University of Technology, Brno, Czech Republic 26th October 2017

CLIC Challenge vs QD0 stabilization TABLE OF CONTENTS INTRODUCTION Context CLIC Challenge vs QD0 stabilization Vibration control for CLIC Beam trajectory control (IPFB) Mechanical stabilization Custom vibration sensor FuturE prospectS Vibration sensor improvement ATF2 Conclusion Gaël Balik LAPP IN2P3/CNRS

Vertical beam offset: 0,2 nm RMS @ 0,1Hz INTRODUCTION - Context Final focus CLIC R&D: Sub-nanometer beams Developments of LAViSta team are dedicated to the final focus Vertical beam offset: 0,2 nm RMS @ 0,1Hz QD0 Cantilever CLIC detector QD0 L* Gaël Balik LAPP IN2P3/CNRS

Final focus : beam stabilization strategy INTRODUCTION - CLIC Challenge vs QD0 stabilization Final focus : beam stabilization strategy At the IP (mechanical + beam feedback), we aim a vertical beam offset at 0,2nm at 0,1Hz IPFB : Interaction Point beam based FeedBack is already developed in collaboration with CERN since 2010 Active / passive stabilization : has to be achieved (“Mechanical stabilization”)… Gaël Balik LAPP IN2P3/CNRS

IPFB - simulation under PLACET VIBRATION CONTROL FOR CLIC - Beam trajectory control (IPFB) IPFB - simulation under PLACET PLACET a program to simulate drive beams - Caron B, et al, 2012, “Vibration control of the beam of the future linear collider”, Control Engineering Practice. - Balik G. et al, 2012, “ Integrated simulation of ground motion mitigation, techniques for the future compact linear collider (CLIC) “, Nuclear Instruments and Methods in Physics Research Controller performances Luminosity vs control ON or OFF and vs model of seismic motion (simulation under PLACET) Gaël Balik LAPP IN2P3/CNRS

Commercial sensors and a developed active foot VIBRATION CONTROL FOR CLIC - Mechanical stabilization Before 2016 : demonstration at a sub-nanometer scale Developed active foot with commercial sensors (geophones and accelerometers) 2 sensors used in feedforward and 2 sensors used in feedback Commercial sensors and a developed active foot Sensors dedicated to measurement but not to control Two needed technologies for the selected bandwidth (geophones for low frequencies and accelerometers for high frequencies) complexity of the control Results with commercial sensors : 0,6 nm RMS@4Hz. - Balik G. et al, “Active control of a sub nanometer isolator“, JIMMSS, 2013. - Le Breton R. et al, Nanometer scale active ground motion isolator, Sensors and Actuators A: Physical, 2013. Main limitation : SENSORS (Experimental and theoretical demonstration). Gaël Balik LAPP IN2P3/CNRS

Prototypes developed since 2011 VIBRATION CONTROL FOR CLIC - Custom vibration sensor Development of a new vibrations sensor: Internal development at LAPP Approach validated → Patent n° FR 13 59336 Prototypes developed since 2011 Comparison with Güralp and Wilcoxon sensors at CERN (ISR): Promising results (similar to the best commercial sensors) Gaël Balik LAPP IN2P3/CNRS

Active control with the custom sensor VIBRATION CONTROL FOR CLIC - Mechanical stabilization 25/06/2018 2016 : CLIC Demonstration of feasibility at reduced scale Active control with the custom sensor CLIC specification (displacement of the QD0 final focus) : 0,20 nm RMS@4Hz Previous results with LAPP active foot + 4 commercial sensors : 0,60 nm RMS@4Hz Results of control (autumn 2016) with LAPP active foot + 1 LAPP vibrations sensor : 0,25 nm RMS@4Hz Only 1 sensor in feedback -> control less complex and more efficient Submitted in September 2017, in collaboration with SYMME (approval in progress) 0,25 nm@4Hz ≈ Spec - LAPP active foot + LAPP sensors (one on ground used to monitor ground motion and 1 on top used in feedback) - - Displacement without control / with control at LAPP - Gaël Balik LAPP IN2P3/CNRS Entrez votre nom

More cultural noise >100 HZ Control still efficient <100 HZ VIBRATION CONTROL FOR CLIC - Mechanical stabilization Simulation of the active control with in a collider environment CMS detector ground motion is taken into account (high level of cultural noise - pessimistic) Simulation of the system (foot + sensors) with these disturbances More cultural noise >100 HZ The Compact Muon Solenoid (CMS) Control still efficient <100 HZ 0,78 nm@4Hz > Spec Disturbances don’t reveal the same distribution (more cultural noise) Control is not efficient enough in this case (above 100 Hz) Gaël Balik LAPP IN2P3/CNRS

Example of usable PI (Biltz® B13W- vibration isolation rubber pad). VIBRATION CONTROL FOR CLIC - Mechanical stabilization Simulation of the active control with a collider environment Necessity to have a passive insulation under the concrete or under the last elements Passive isolation ≈ 25 Hz 0,26 nm@4Hz ≈ Spec A passive insulation at about 25 Hz is common to the standard industrial solutions Example of usable PI (Biltz® B13W- vibration isolation rubber pad). Poster session at IPAC17: G. Balik et al, “Proof of concept of CLIC final focus quadrupoles stabilization”, in Proceedings of International Particle Accelerator Conference (IPAC 2017), Copenhagen, Denmark. Gaël Balik LAPP IN2P3/CNRS

Comparison of different technologies for the embedded sensitive part FUTURE PROSPECTS- vibration sensor improvement Comparison of different technologies for the embedded sensitive part PACMAN : Particle Accelerator Components’ Metrology and Alignment to the Nanometer scale (Marie Curie program at CERN) Collaboration with several labs and industries : LAPP academic partner – SYMME co-director of a thesis Use of the LAPP sensor with dedicated instrumentations Capacitive sensors : PI & Lion Precision Optical encoder : Magnescale Interferometer : Attocube & a developed one (INRiM (It) and ISI Brno (Cz)) P. Novotny et al, “What is the best displacement transducer for a seismic sensor?”, IEEE Inertial Sensors and Systems 2017, Hawaï, USA. Gaël Balik LAPP IN2P3/CNRS

Integration of a multipass-interferometer FUTURE PROSPECTS- vibration sensor improvement Integration of a multipass-interferometer Collaboration with ISI (Institute of scientific Instruments , The Czech Academy of Sciences) Vibration sensor with different technologies for the embedded sensitive part High reflectivity mirror to increase the signal-to-noise ration in the built-in interferometric sensor New opto-mechanical components to suppress low frequency noise Further tests ongoing and comparison with current setup (embedded capacitive sensor) Multipass interferometer setup test Gaël Balik LAPP IN2P3/CNRS

Responsible of the final doublet relative displacement FUTURE PROSPECTS- ATF2 2008 Responsible of the final doublet relative displacement Magnet 450kg 2012 Shintake monitor : beam size measurement FD : Final Doublet Relative motion between shintake monitor and final doublets of 6 nm RMS @ 0,1 Hz in the vertical axis. -> Analysis of the upgrades influences and of the drift. Magnet 1200kg ATF2 magnet supports upgrades 2008 by B. BOLZON Tolerance Measurement [SM-QD0] Measurement [SM-QF1] Vertical 7 nm (for QD0) 20 nm (for QF1) 4.8 nm 6.3 nm Perpendicular to the beam ~ 500 nm 30.7 nm 30.6 nm Parallel to the beam ~ 10,000 nm 36.5 nm 27.1 nm 2013 by A. JEREMIE Tolerance Measurement [SM-QD0] Measurement [SM-QF1] Vertical 7 nm (for QD0) 20 nm (for QF1) 4.8 nm 30 nm Parallel to the beam ~ 10,000 nm 25 nm 290 nm feet and T-plate Gaël Balik LAPP IN2P3/CNRS

FUTURE PROSPECTS- ATF2 25/06/2018 Involved in the assessment of the beam feed-forward control vs ground motion Vibration sources identification Feedforward study: correlation between the ground and the beam motions. Processing of 14 Geophones (Guralp 6T sensors) Collaboration with CERN, LAL & KEK Last campaign of measurements : May 2017 Next campaign in December 2017 D. Bett et al, “Ground motion compensation using feed-forward control at ATF2, in Proceedings of International Particle Accelerator Conference (IPAC 2016), Busan, Korea. Gaël Balik LAPP IN2P3/CNRS Entrez votre nom

Active control Future prospects Conclusion Active control A sensor dedicated to this vibrations control issue is developed Sub-nanometer control is validated by demonstration on a small size prototype Future prospects Improvements of the developed sensor (comparison of different technologies for the embedded sensitive part) Improvement of the embedded multipass interferometer and comparison with a original capacitive measurement ATF2 beam and ground motions correlation study ongoing, feedforward implication, next campaign planned in December 2017 Gaël Balik LAPP IN2P3/CNRS

Thank you for your attention Gaël Balik LAPP IN2P3/CNRS