Introduction to the PACMANproject

A study on Particle Accelerator Components’ Metrology and Alignment to the Nanometre scale

OUTLINE

Scientific goals of the projectReview of the subjects proposedOrganization of the project

Web site http://cern.ch/pacman

CLIC workshop 201404/02/2014

H. Mainaud Durand,

on behalf of the PACMAN team

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:

o Very tight tolerances of alignment of components, to about 10 µm over a distance of 200m

o Active stabilization of the quadrupoles in the nanometre range required

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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)

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Scientific goals of the project

Introduction to the CLIC project

Different types of components:

Quadrupoles :

o MB quadrupoles: ~ 4000

o DB quadrupoles: ~ 42 000

BPM: one per each quadrupole

Accelerating structures: ~ 142 800

PETS components: ~ 71 000

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Scientific goals of the project

Starting point = challenge concerning the pre-alignment of the CLIC components.

Requirements:

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 consumingconsidering the number of components to be aligned…

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

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Fiducialisation of components

Fiducialisation of their common support

Alignment on a common support

Whole assembly ready to be aligned

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Special case of MB quadrupole

One additional step: the stabilization / nano-positioning system

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:

Beam Instrumentation

MetrologyMicrometric alignment

Nano positionin

g

Magnetic measurements

Ultra high precision

engineeringRF

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Scientific goals of the project

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

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

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PACMAN WP1: metrology and alignment

ESR Subject Secondment Univ. CERNSuperv.

1.1 Non contact high precision sensor for Leitz Infinity Coordinate Measuring Machine

Hexagon (3M+2M)

Cranfield University

H. Mainaud Durand (A. Cherif)

1.2 Development and validation of an Absolute Frequency Scanning Interferometry (FSI) network

Etalon (3M) ETHZ J-C Gayde

1.3 Micro-triangulation for high accuracy short range measurements of dynamic objects

Etalon (3M), ETHZ (3M)

ETHZ F. Fuchs

PACMAN WP2: magnetic measurements

ESR Subject Secondment Univ. CERNSuperv.

2.1 Stretched wire systems for the magnetic measurements of small-aperture magnets

Sigmaphi (3M), Metrolab (3M)

Sannio S. Russenschuck

2.2 Printed circuit board technology for small-diameter field probes

Eltos (3M), Sigmaphi (2M)

Sannio M. Buzio

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)

PACMAN WP3: precision mechanics and stabilization

ESR Subject Secondment Univ. CERNSuperv.

3.1 Ultra-precise quadrupole magnets assembly and testing. Integration of an alignment test-bed towards an industrial production

DMP (4M) Cranfield University

M. Modena

3.2 Seismic sensor development and vibration characterization LAPP (7M), DMP (3M)

Savoie, SYMME

A. Gaddi

3.3 Nano-positioning of the main LINAC quadrupole as means of laboratory pre-alignment

TNO (6M) withTU delft

TU Delft H. Mainaud Durand (K. Artoos)

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.

PACMAN WP4: Beam instrumentation

ESR Subject Secondment Univ. CERNSuperv.

4.1 Alignment and resolution of a Beam Position Monitor operating at microwave frequencies in the nanometre regime

NI (3M) Valencia M. Wendt

4.2 Development of direct measurement techniques for the in-situ internal alignment of accelerating structures

NI (3M) Valencia N. Catalan Lasheras

– 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.

Marie Curie action

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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):o Management at CERNo ESRs must be working towards a PhDo Secondment of at least 3 months in industry for each ESRo Associated partners from industry and universities

PACMAN will offer training to 10 ESRs

Total EU contribution: 2,671,412.70 EUR

PACMAN : associated partners

DMP ES

ELTOS IT

ETALON DE

METROLAB CH

SIGMAPHI FR

Cranfield University GB

ETH Zürich CH

LAPP FR

SYMME FR

University of Sannio IT

IFIC ES

Delft University of Technology NL

Hexagon Metrology DE

National Instruments HU

TNO NL

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WP6 Diss & OutreachM. Modena

Supervisory BoardCERN,

HEXAGON, ETALON, ELTOS, METROLAB, DMP, SIGMAPHI, TNO, NIDELFT, CRANFIELD, SANNIO univ., LAPP, ETHZ,IFIC, SYMME

WP0 ManagementH. Mainaud Durand

WP5 TrainingN. Catalan Lasheras

WP4 Beam Instrumentation

M. Wendt

WP3 Precision mech. & stabilization

M. Modena

WP2 Magnetic MeasurementsS. Russenschuck

WP1 Metrology & Alignment

H. Mainaud Durand

ESR1.3

ESR4.1ESR3.1 ESR3.2

ESR3.3

ESR2.2ESR2.1ESR1.2ESR1.1ESR4.2

Management team

Admin. Assistant:Alexandra Hati

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Organization of the project

Organization of the project

Start date = 1/09/2013

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9 students out of 10 recruited

Recruitment of the 10th student under progress

3 students have started on the 3rd of February

Conclusion

PACMAN project is a golden opportunity for CLIC:o To push technologies and methods to improve the alignment of the CLIC

components, which is a critical challenge for the projecto 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: o training through research at CERN and at universities, o exchange of knowledge through secondments in the industrial partners, o Scientific, academic and technological training courses including trainings

organized by PACMANo Transferable skills training courses

3 PACMAN workshops will be organized, with training and dissemination purposes, combined with a rich program of dedicated outreach activities

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