1. 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

2. 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 CERN

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

4. 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 CERN

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

6. 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 CERN

7. 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 CERN

8. 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

9. 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 CERN

10. 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 CERN

11. 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 CERN

12. 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
Once / couple of hours
Repeat 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

13. 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 CERN

14. 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 CERN

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