1. PROGRESS ON THE CLIC MBQ STABILIZATION R&D K. Artoos, C. Collette **, M. Esposito, P. Fernandez Carmona, M. Guinchard, S. Janssens*, R. Leuxe, R. Morón Ballester The research leading to these results has received funding from the European Commission under the FP7 Research Infrastructures project EuCARD * PhD student ULB-CERN * * Associate ULB

2. Outline K.Artoos, CMWG 21.03.2012 2  Introduction/reminder  2011 improvements and results  2012: x-y guide prototype  Ongoing work, preparation type 1 MBQ

3. Introduction/Reminder: Requirements MBQ Stability (magnetic axis): Nano-positioning K.Artoos, CMWG 21.03.2012 3 Type 4: 2m, 400 kgType 1: 0.5 m, 100 kg A. Samoshkin Vertical MBQ 1.5 nm > 1 Hz Vertical Final Focus 0.2 nm > 4 Hz Lateral MBQ, FF 5 nm > 1 Hz 5 nm > 4 Hz BUT Final requirement is Integrated Luminosity

4. Introduction/Reminder: Other requirements K.Artoos, CMWG 21.03.2012 4 Available space Integration in two beam module 620 mm beam height Accelerator environment - High radiation - Stray magnetic field A. Samoshkin Stiffness-Robustness - Applied forces - Compatibility alignment - Uncertainty -Transportability Strategy STIFF support

5. Introduction/Reminder: Additional study K.Artoos, CMWG 21.03.2012 5 « Nano-positioning» feasibility study Modify position quadrupole in between pulses (~ 5 ms) Range ± 5 μ m, increments 10 to 50 nm, precision ± 1nm In addition/ alternative dipole correctors Use to increase time to next realignment with cams 5

6. Introduction/Reminder: Concept K.Artoos, CMWG 21.03.2012 6 Inclined stiff piezo actuator pairs with flexural hinges (vertical + lateral motion) (four linked bars system) X-y flexural guide to block roll + longitudinal d.o.f.+ increased lateral stiffness. (Seismometers)/ inertial reference masses for sensors

7. CDR Chapter Anno October 2010 (OBSOLETE) K.Artoos, CMWG 21.03.2012 7 1 d.o.f. (membrane) 2 d.o.f. (tripod) 0.6 nm from 2.2 nm 1.6 nm from 6.4 nm 0.44 nm at 4 Hz Lateral stabilization Vertical stabilization 0.9 from 2 nm Transfer function not very good for luminosity Feedback only

8. 8K.Artoos, CMWG 21.03.2012 S. Redaelli, CERN ‘04 B. Bolzon, LAPP 2007 TMC STACIS™ Previous performances on stabilization of accelerator components TMC table: Stiffness: 7 N/ μm (value catalogue) 2 3

9. J. Frisch, SLAC 2001 C. Montag, DESY 1996 Previous performances on stabilization of accelerator components nm 9 K.Artoos, CMWG 21.03.2012 3 2

10. 2011 10 K.Artoos, CMWG 21.03.2012 Five R&D themes in 2011: 1.Performance increase → Reach requirements from higher background vibrations + include direct forces → Increase resolution (Final focus) 2.Compatibility with environment → Radiation, magnetic field, Operation, Temperature 3.Cost optimization → Standardize and optimize components, decrease number of components, simplify mounting procedures,… 4.Overall system analysis → Interaction with the beam-based orbit and IP feedback to optimise luminosity Integration with other CLIC components → Adapt to changing requirements 5.Pre-industrialization → Ability to build for large quantities

11. Gain limited by Stability 11 K.Artoos, CMWG 21.03.2012 Sources of instability:  Type of filters  Sensor/Actuator  Delay  Mechanical « spurious » resonances  Clipping Performed work:  Improvement model + controller  Improvement type of filters  Feedback + Feed Forward  Study other sensors  Change to analogue Hardware + Hybrid  LOCAL controller  Modal analysis, small improvements on test benches Type 1  Optimisation of electronics

12. FB + FF 12 K.Artoos, CMWG 21.03.2012 Transmissibility Stef Janssens

13. Controller electronics 13 1&2 K.Artoos, CMWG 21.03.2012 P. Fernandez-Carmona Power ≈80W Cost ≈15000CHF Volume ≈13 l Power ≈2 W Cost ≈100CHF Volume ≈0.15 l + Lower latency Low enough noise + Low cost + Small volume + Less sensitive to single events + Low power consumption -Limited flexibility, no external communication Hybrid circuit From Digital to Analogue PXI Analogue

14. 14 Controller electronics: Hybrid 2 analogue chains + positioning offset Local electronics ADCs digitize signals For remote monitoring Communication to remote control center with optical fiber K.Artoos, CMWG 21.03.2012 SPI Control loop delay Stabilization performance 43 μ s 100% 80 μ s 90% 90 μ s 80% 100 μ s 60% 130 μ s30%

15. 15 Water cooling 4 l/min With magnetic field on With hybrid circuit FigureValue R.m.s @ 1Hz magnet0.5 nm (during the day) R.m.s @ 1Hz ground6.3 nm R.m.s. attenuation ratio~13 R.m.s @ 1Hz objective1.5 nm Stabilization on Type 1 magnet K.Artoos, CMWG 21.03.2012

16. 16 Long Term Stability  Temperature stable within 0.5 degrees Test with temperature to be done Objective achieved K.Artoos, CMWG 21.03.2012 Test was monitored remotely P. Fernandez Carmona

17. 17 Comparison K.Artoos, CMWG 21.03.2012

18. Integrated luminosity simulations 18 No stabilization68% luminosity loss Seismometer FB maximum gain (V1)13% Seismometer FB medium gain (V1mod) 6% (reduced peaks @ 0.1 and 75 Hz) Seis. FB max. gain +FF (FBFFV1mod)7% Inertial ref. mass 1 Hz (V3mod)11% Inertial ref. mass 1 Hz + HP filter (V3)3% Courtesy J. Snuverink, J. Pfingstner et al. Commercial Seismometer Custom Inertial Reference mass K.Artoos, CMWG 21.03.2012 Stef Janssens

19. Integrated luminosity simulations 19 No stabilization68% luminosity loss Inertial ref. mass 1Hz (V3mod)11% Inertial ref. mass 1Hz + HP filter (V3)3% Inertial ref. mass 7 Hz (V3 mod 1)Orbit fb optimised V3: 0.7% Commercial Seismometer Custom Inertial Reference mass K.Artoos, CMWG 21.03.2012 Courtesy J. Snuverink et al. KEY component for luminosity is now the sensor Stef Janssens

20. 2012: Positioning + Stab. test bench X-y guide prototype 20 1&2 K.Artoos, CMWG 21.03.2012 X-y guide « blocks » roll + longitudinal Increases lateral stiffness by factor 500, no modes < 100 Hz Introduces a stiff support for nano metrology cross check with interferometer Test transport restraint M. Esposito, R. Leuxe

21. 2012: Positioning + Stab. test bench X-y guide prototype 21 1&2 K.Artoos, CMWG 21.03.2012

22. 2012: Positioning + Stab. test bench X-y guide prototype operational 22 1&2 K.Artoos, CMWG 21.03.2012

23. 2012: Positioning + Stab. test bench X-y guide prototype operational 23 1&2 K.Artoos, CMWG 21.03.2012 High precision measurements parasitic mouvements Pre alignment tolerance is 100 µrad Lateral motion: Roll:

24. 2012: Positioning + Stab. test bench X-y guide prototype operational 24 1&2 K.Artoos, CMWG 21.03.2012 Cross check between different instrumentation + resolution measurements 14 pm sine wave 14 nm sine wave

25. 2012: Ongoing K.Artoos, CMWG 21.03.2012 25 Build and test a stabilised Type 1 and type 4 MBQ placed on the alignment system in ISR After full testing, transport to test module and install. Design and build a type 1 for CLEX Build and test several sensor prototypes Remote control part of the electronics Radiation testing : SEU + accumulated dose At first with Guralp

26. Mechanical design 26 Monolithic approach of the design: To simplify the assembly + increase precision Reduce assembly stresses on actuator + magnet Improve sensor installation: inertial ref. mass and displacement gauges Optimise vertical, lateral and longitudinal stiffness Decrease parasitic motion if needed Solve integration in module Mechanical locking for transport Improve interface with alignment 1&2 Work in progress: T1 test module design K.Artoos, CMWG 21.03.2012 M. Esposito, K. Artoos

27. Modelling MULTIPLE d.o.f. 27 Modeling multiple d.o.f. in parts: get firm understanding of interactions between mechanics and controller Unstable K.Artoos, CMWG 21.03.2012 Stable 4 d.o.f. Give parameters for mechanical system =>xy-guidance Stef Janssens, Christophe Collette

28. 2012: Ongoing K.Artoos, CMWG 21.03.2012 28 Integration in module J. Kemppinen, R. Leuxe, H. Mainaud Durand

29. 2012: Ongoing K.Artoos, CMWG 21.03.2012 29

30. Development Inertial reference 30 1&2 K.Artoos, CMWG 21.03.2012 Several Prototypes under preparation + testing Plan to subcontract 1 development to industry Goal: Improved transfer function Radiation and magnetic field hard Lower noise, higher resolution

31. 31 Stabilisation Radiation tests 2012 Courtesy S. Mallows Contact with RAD WG SEU tests in the H4IRAD test stand at CERN planned for August Several components under evaluation. Larger community working on same problems Sensitivity simulation of controller to changes in the components remark from RAD WG: Essential for CLIC: obtain more complete and sure expected radiation values. Available shielding for electronics in the CLIC tunnel ???? Pablo Fernandez Carmona H4IRAD test stand

32. Conclusions 32 K.Artoos, CMWG 21.03.2012  In 2011 we increased the performance of the stabilisation system and tested with nominal field and waterflow  Low cost electronics local controller with interface for the CLIC controller developed and tested  From integrated r.m.s. to integrated luminosity  Performance confirmed with prototype x-y + mechanics and metrology improved  Type 1 stabilisation system under design now, based on x-y proto, reducing number of parts  Sensor R&D  Radiation R&D and testing

33. Publications 33 K.Artoos, CMWG 21.03.2012 http://clic-stability.web.cern.ch/clic-stability/publications.htm

34. MULTIPLE d.o.f. 34 K.Artoos, CMWG 21.03.2012 To be done: Add alignment Stef Janssens, Christophe Collette