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INTRODUCTION TO THE CLIC PROJECT AND THE CLIC PRE- ALIGNMENT STUDIES

INTRODUCTION TO THE CLIC PROJECT AND THE CLIC PRE- ALIGNMENT STUDIES. Hélène MAINAUD DURAND, BE/ABP/SU, 04/05/2010. Status of the study.

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INTRODUCTION TO THE CLIC PROJECT AND THE CLIC PRE- ALIGNMENT STUDIES

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  1. INTRODUCTION TO THE CLIC PROJECT AND THE CLIC PRE-ALIGNMENTSTUDIES Hélène MAINAUD DURAND, BE/ABP/SU, 04/05/2010

  2. Status of the study The Compact Linear Collider (CLIC) Study is a site independent feasibility study aiming at the development of a realistic technology at an affordable cost for an electron-positron Linear Collider in the post-LHC era for Physics up to the multi-TeV center of mass colliding beam energy range (nominal 3 TeV).  next milestone of this project is a Conceptual Design Report (CDR) that must be ready end of 2010.

  3. Status of the study • Based on a two beams technology (Drive Beam, Main Beam) • Basic components: • DB: PETS, quads and BPM • MB: RF structures, quads and BPM • Each main linac consists of sequences of 2m modules • 4 lengths of MB quad (0.5 m, 1m, 1.5m, 2m) •  5 types of modules 2 m

  4. CLIC Pre-alignment requirements Strategy of alignment • Mechanical pre-alignment Within +/- 0.1 mm (1s) • Implementation of active pre-alignment Girders and quadrupoles within ± 3 mm (1s) • Implementation of beam based alignment and beam based feedbacks Active positioning to the micron level Stability to the nanometer level on the MB quads

  5. CLIC Pre-alignment requirements Strategy of alignment The expected performance on the active pre-alignment is of the order of several micrometers over sliding windows of at least 200 m.  realistic data: 15 µm (1σ) (solution proposed in CDR)  target: 3 µm (1σ) CLIC accelerator will be « laser straight ». The solution proposed in the CDR is based on overlapping stretched wires and Wire Positioning Sensors (WPS).

  6. General strategy: determination of the position of the components Geodetic Reference Network (GRN) Backbone for all the tunnels and areas Will allow the installation of all services and of the MRN 6

  7. General strategy: determination of the position of the components Geodetic Reference Network (GRN) Metrologic Reference Network (MRN) • As it is not possible to implement a straight alignment reference over 20 km: use of overlapping references • Two references under study: • a stretched wire • a laser beam under vacuum 7

  8. General strategy: determination of the position of the components Geodetic Reference Network (GRN) Metrologic Reference Network (MRN) Support Pre-alignment Network (SPN) 8

  9. General strategy: determination of the position of the components Geodetic Reference Network (GRN) Metrologic Reference Network (MRN) Support Pre-alignment Network (SPN) Alignment and fiducialisation of each component on the supports (AFC) 9

  10. Status of the different solutions Strategy towards the feasibility • Only one solution ready for CDR : stretched wire + cWPS • design of a new mechanical interface and associated calibration bench  improve the accuracy (target : accuracy < 5 μm) • cost study in definition for 50 000 units. Stretched wire for MRN and SRN 10

  11. Summary: proposed solution for CDR Determination of the position of the components:  stretched wire + WPS sensors for MRN and SPN

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