A.Jeremie Some drawings from different CLIC’08 presentations Contribution from Annecy Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP) (EuCARD, WP9.3) and SYMME Université de Savoie A.Jeremie Some drawings from different CLIC’08 presentations

LAViSta Team Laboratories In Annecy working on Vibrations and Stabilisation LAPP: A.Jeremie (group leader), N.Geffroy, L.Brunetti, G.Deleglise, B.Bolzon (currently in Japan on ATF2), machine shop. SYMME: J.Lottin (group leader), B.Caron, A.Badel, PhD student. A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

CLIC feasibility issues J.P.Delahaye CLIC’08 !

EuCARD WP 9.3 Sub-task 1: CLIC quadrupole module. Inertial sensors will be tested and evaluated for accelerator environment (magnetic field, radiation, electrical and acoustic noise from accelerator components). Study vibration isolation for the main beam quadrupole (principle, mock-up, feedback to be adapted to new boundary conditions) and build a test bench. Also study the design and construction of main linac prototype magnet. This activity aims to design and build a quadrupole mock-up that can serve as a model for the main linac quadrupole. The model will be used to investigate the performance of the stabilisation equipment aims at testing the compatibility (space, interferences, and complementarities) between the repositioning system (movers + associated sensors) and the stabilization system in the real environment of the two beam test stand. Sub-task 2: Final Focus Test stand. aims at exploring the potential to achieve 0.1 nm stability scale for the final doublet quadrupoles above a few Hz by working on the design, simulation, construction and installation of the support (final doublet mock-up, eigenmode analysis) and on the feedback design depending strongly on the final doublet support chosen. Contribute to the Development of optimized low-emittance beam transport and feedback for ILC and CLIC by completing an ILC prototype ATF2 intra-train and pulse-pulse Feedback and Final Focus system. In addition, they will study the simulation of the global luminosity performance of ILC and CLIC. A lot done on ATF2 A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

Milestones and deliverables 4 years starting from April 2009 A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

Participants Task coordinator: Andrea Jeremie (LAPP) Magnet sub-task: Michele Modena (CERN) Stabilisation/instrumentation sub-task: Claude Hauviller (CERN) Alignment sub-task: Hélène Mainaud-Durand (CERN) Stabilisation/instrumentation sub task: Andrea Jeremie (LAPP) Laser interferometry sub-task: David Urner (Oxford University) A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

Active Stabilisation WG An integrated approach: stabilization elements to be taken into account at the design phase of CLIC components, ground motion characterization, sensors, actuators, alignment compatibility with beam dynamics => stabilisation WG part of the CLIC Technical Committee: CERN Claude Hauviller (and LAPP Andrea Jeremie as EuCARD task coordinator) LAPP/CNRS: A.Jeremie, B.Bolzon, N.Geffroy, L.Brunetti, G.Deleglise, machine shop CERN: C. Hauviller, K. Artoos, O. Capatina, M. Guinchard, F.Lackner, D. Schulte (M.Modena) SYMME/Université de Savoie: J.Lottin, B.Caron, A.Badel, PhD student Oxford: D.Urner, P.Coe, M.Warden Some other groups interested already several common meetings in 2008 and a task list MONALISA IRFU/SIS A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

Actions list (keywords) Sensors Characterize vibrations/noise sources in an accelerator Actuators Feedback Overall design + analysis Integrate and apply to Linac C.Hauviller CLIC’08

Status of design Simulations 0.13 nm with feedback and TMC table Laser-based stabilisation Measurements of GM at DESY/CERN Acoustic noise effect Several PhDs: S.Redaelli (CERN) 2003 B.Bolzon (LAPP) 2007 Candidate selected (SYMME) ~2011 A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

What Annecy brings to the project Experience in vibration measurements/instrumentation Experience with low noise acquisition system Feedback development FE calculations: static and dynamic Dynamic response of a structure to feedback Demonstration of sub-nanometre stability (in laboratory environment) Automatics experience A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

Different MB mock-ups for stabilisation studies: CERN and Annecy Stabilisation table Develop the isolation system; stabilise 420mm magnet mock-up In Annecy Table built; under measurement MB quadrupole mock-up Measure magnet vibration and develop best magnet support At CERN/ quiet place Under design; within a year with magnet mock-up MB test module Test the integration of all systems At CERN/ in CTF3 environment Under design A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

CLIC stabilization requirements Overview of the global alignment / stabilization strategy for main linac magnets Once / year: Mechanical pre-alignment => 0.1 mm Active pre-alignment using HLS, WPS, RASNIK => +/- 10 mm on a sliding window of 200 m Beam based active alignment with movers – complex procedure => 1 mm Beam based alignment with magnet correctors => few nm Once / few weeks Repeat 2. + 3. + 4. Once / couple of hours Repeat 3. + 4. but “simplified” procedure “Steady state” procedure with mechanical stabilization ON or OFF depending on magnet Mech. Stabil. OFF ON Beam OFF Beam ON O. Capatina et al., Novosibirsk, 27th of May 2008

Remaining critical issues Make a compact design Make it work in an accelerator environment In particular radiation effects have to be considered Radiation level at CLIC not yet estimated Radiation damage effects on electronics: Total dose Single event error Experience with other CERN projects have shown Single event error can produce important failures Compatibility with other systems Stability along the whole beam How do we validate the system: in beam line, or stand alone enough, only in vertical direction? Do we need to integrate into BBF or are we independent Do we want to validate by a damping ratio at each frequency or is a mean value enough? Reduce cost of isolation system given the large number of quadrupoles A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

Sample questions to be addressed Different sizes of quadrupoles (420, 920, 1420, 1915): less accelerating structures on module? Each type of module has different vibration behaviour. What is the vibration influence of DB (waveguides…) on the MB quadrupole? What supports what? Quadrupole (not) on girder=> independent of active alignment? How do the different stages of active/passive act on each other? Stabilisation system closest to object to stabilise needs passive material => how can the alignment system work if there is something “soft” above it? Is it possible to use some common elements? How is the magnet attached to the stabilisation system? How rigid is it? ATF2 chose a RIGID support. For vibration purposes, it is better to be closest to the floor and avoid high structures A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN

Annecy Work plan for MB stabilisation (to be finalised) Multi-point compensation to stabilise whole quadrupole (2009-2011): Feedback: complete model or co-localisation Multi sensor/actuator Detailed model of magnet/ support Dynamic response (FE=>Matlab=>Simulink) Isolation mock-up (2009-2010): Study isolation table with 420mm mock-up Isolation table cost reduction Magnet mock-up (2009-2011): Design (magnet shape /assembly /attachment /support) Dynamic calculations of 1900mm quadrupole Instrumentation assessment (2009-2010): Sensor assessment (from PMD scientific) Actuator assessment (Cedrat) Compare with interferometric laser system Characterise noise/vibration sources Integrated approach with pre-alignment (2009-2012) Integrate in MB Module A.Jeremie Annecy contribution Test Module Kick-off meeting January 26 2009 CERN