OUTLINE Scientific goals of the project Review of the s ubjects proposed

1. Introduction to the PACMANprojectA study on Particle Accelerator Components’ Metrology and Alignment to the Nanometre scale Web site http://cern.ch/pacman • OUTLINE • Scientific goals of the project • Review of the subjectsproposed • Organization of the project CLIC workshop 2014 04/02/2014 H. Mainaud Durand, on behalf of the PACMAN team

2. Scientific goals of the project • Introduction to the CLIC project challenges: • Sub-µm beam size, down to a few nm at the IP • A number of challenges to be mastered, among which: • Very tight tolerances of alignment of components, to about 10 µm over a distance of 200m • Active stabilization of the quadrupoles in the nanometre range required

3. Scientific goals of the project • Introduction to the CLIC project • Based on a two beam acceleration concept • Each linac consists of more than 10 000 modules (with a 2m length)

4. Scientific goals of the project • Introduction to the CLIC project • Different types of components: • Quadrupoles : • MB quadrupoles: ~ 4000 • DB quadrupoles: ~ 42 000 • BPM: one per eachquadrupole • Accelerating structures: ~ 142 800 • PETS components: ~ 71 000

5. Scientific goals of the project • Starting point = challenge concerning the pre-alignment of the CLIC components. • Requirements: • The zero of each component will be included in a cylinder with a radius of a few microns: • 14 µm (RF structures & MB quad BPM) • 17 µm (MB quad) • 20 µm (DB quad) • Active alignment consists of two steps: • Determination of the position by alignment sensors • Re-ajustment by actuators • Current strategy • Series of steps: fiducialisation of the components and their support, alignment on a common support, alignment in the tunnel using sensors fiducials. • but time and precision consuming • considering the number of components to be aligned…

6. Fiducialisation of components Fiducialisation of their common support Alignment on a common support Whole assembly ready to be aligned

7. Special case of MB quadrupole • One additional step: the stabilization / nano-positioning system

8. Scientific project • PACMAN project: • Propose and develop an alternative solution integrating all the alignment steps and technologies at the same time and location (CMM machine) • Technologies concerned: Ultra high precision engineering Micrometric alignment Magnetic measurements Beam Instrumentation Nano positioning RF Metrology

9. Scientific goals of the project • Key activities: • Integration, ultra-high precision engineering and manufacturing • Magnetic measurements with a vibrating stretched wire (and alternative based on printed circuit boards rotating search coils) • Determination of the electromagnetic centre of BPM and RF structure using a stretched wire • Absolute methods of measurements: new measuring head for CMM, combination of FSI and micro-triangulation measurements as an alternative • Improve seismic sensors and study ground motion • Nano-positioning system to position the quadrupole and BPM Outcome = a prototype alignment bench • Long term • Automation of the process • Simplification (method, duration, components) • Extrapolation to other components • Optimization of performances and precision in all domains • Preparation of industrialization

10. PACMAN  WP1: metrology and alignment

11. PACMAN  WP2: magnetic measurements • Main goals: • develop instruments and methods to measure the position of the magnetic axis of quadrupole magnets within an absolute uncertainty of 10 m. • develop instruments and methods to measure the field strength and quality (polarity, direction, harmonic content) of multipole magnets within an aperture as small as 4 mm • Constraints • integration with other equipment on the test stand • scalability to very large industrial production (issues: automation, robustness, cost, speed)

12. PACMAN  WP3: precision mechanics and stabilization • ESR 3.1 taks: • To complete the MBQ quadrupoles design, focusing on the critical performance aspects like PRECISION of the assembly, LIMITATION of the assembly time, COST minimization • To integrate the different contributions of the PACMAN development (metrology, alignment, magnetic measurement, mechanical assembly, microwave technology), in a final integrated assembly test stand • ESR 3.2 tasks: • To upgrade or develop seismic sensors which are suitable for measurement at sub-nanometre scale with a large bandwidth covering the whole frequency region of interest (0.1-100 Hz). • ESR 3.3 tasks: • To upgrade and integrate in the PACMAN stand a nano-positioning system for the MBQ magnets. This system will be needed for the alignment of the magnet during Modules assembly and for the beam steering during the CLIC accelerator operation.

13. PACMAN  WP4: Beam instrumentation • ESR4.1: Alignment between a CLIC/CTF 15 GHz cavity BPM and the Main Beam quadrupole • A stretched-wire method could be utilized to align the center of the magnetic field of the quad to the center of the dipole mode of the BPM TM110 resonator. • A similar method has been successfully demonstrated in the μm regime on a stripline-BPM/quad combination (DESY-FLASH). • ESR4.2: Alignment between wakefield monitors and CLIC accelerating fields • Minimization of the transverse wakefields (beam blow-up) over several accelerating structures.

14. Marie Curie action • PACMAN project belongs to an Initial Training Network (ITN): •  Improve career perspectives of Early Stage Researchers (ESR) in both public and private sectors •  Make research career more attractive • PACMAN is an Innovative Doctoral programme (IDP): • Management at CERN • ESRs must be working towards a PhD • Secondment of at least 3 months in industry for each ESR • Associated partners from industry and universities • PACMAN will offer training to 10 ESRs • Total EU contribution: 2,671,412.70 EUR

15. PACMAN : associated partners

16. Organization of the project Supervisory Board CERN, HEXAGON, ETALON, ELTOS, METROLAB, DMP, SIGMAPHI, TNO, NI DELFT, CRANFIELD, SANNIO univ., LAPP, ETHZ,IFIC, SYMME Management team Admin. Assistant: Alexandra Hati WP0 Management H. Mainaud Durand WP5 Training N. Catalan Lasheras WP6 Diss & Outreach M. Modena WP4 Beam Instrumentation M. Wendt WP1 Metrology & Alignment H. Mainaud Durand WP2 Magnetic Measurements S. Russenschuck WP3 Precision mech. & stabilization M. Modena ESR4.1 ESR4.2 ESR3.2 ESR3.1 ESR2.1 ESR2.2 ESR1.1 ESR1.2 ESR3.3 ESR1.3

17. Organization of the project • 9 students out of 10 recruited • Recruitment of the 10th student under progress • 3 students have started on the 3rd of February Start date = 1/09/2013

18. Conclusion • PACMAN project is a golden opportunity for CLIC: • To push technologies and methods to improve the alignment of the CLIC components, which is a critical challenge for the project • To have a network of industries in order to provide solutions for the future, towards a CLIC approval • The technical objectives are ambitious but well defined. • A very high quality training program will be proposed to the 10 PhD students: • training through research at CERN and at universities, • exchange of knowledge through secondments in the industrial partners, • Scientific, academic and technological training courses including trainings organized by PACMAN • Transferable skills training courses • 3 PACMAN workshops will be organized, with training and dissemination purposes, combined with a rich program of dedicated outreach activities