The Linear Collider Alignment and Survey (LiCAS) Project Richard Bingham*, Edward Botcherby*, Paul Coe*, Grzegorz Grzelak*, Ankush Mitra *, Johannes Prenting, Armin Reichold* *LiCAS Group, Particle Physics sub-department, University of Oxford, Applied Geodesy Group, DESY, Germany
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The Linear Collider Alignment and Survey (LiCAS) Project Richard Bingham*, Edward Botcherby*, Paul Coe*, Grzegorz Grzelak*, Ankush Mitra*, Johannes Prenting.
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The Linear Collider Alignment and Survey (LiCAS) ProjectRichard Bingham*, Edward Botcherby*, Paul Coe*,
Grzegorz Grzelak*, Ankush Mitra*, Johannes Prenting, Armin Reichold*
*LiCAS Group, Particle Physics sub-department, University of Oxford, UKApplied Geodesy Group, DESY, Germany
14 November 2002 The Linear Collider Alignment and Survey (LiCAS) Project 2
Contents
• Introduction
• LiCAS Project Overview
• Description of Measurement System
• Summary
14 November 2002 The Linear Collider Alignment and Survey (LiCAS) Project 3
Introduction
• Next generation of Linear Colliders will require precision alignment
(eg:- TESLA: 33km Tunnel, Alignment: 200m over 600m)
• The problem– Current open air survey techniques are not sufficient– Ground motion will bring accelerator out of alignment
• Solution: Proposed DESY survey train
with LiCAS : A novel optical system
14 November 2002 The Linear Collider Alignment and Survey (LiCAS) Project 4
Accelerator Alignment
Accelerator Component
Tunnel Wall
Reference Markers
• Place reference markers along tunnel wall • Measure accelerator component with respect to reference markers
How are the reference marker positions measured ?
Tunnel Rail
Use a survey train
14 November 2002 The Linear Collider Alignment and Survey (LiCAS) Project 5
LiCAS Project
Internal Measurement System (FSI+SM) inside a vacuum pipe
Tunnel Wall
Tunnel Rail
External Measurement System (FSI)
Measurement system for the alignment and survey of a Linear Collider
An optical metrology system for the survey train
− Vacuum enclosure between cars– Frequency Scanning Interferometry (FSI) to measure absolute distance – Laser Straightness Monitors (SM) to measure transverse displacements
4.5 m
22.5 m
0.5m
z
x
14 November 2002 The Linear Collider Alignment and Survey (LiCAS) Project 6
Survey Train in ActionTunnel Wall
Tunnel Rail
Internal FSI Lines and SMReference Wall Markers External FSI Lines
Reconstructed Tunnel Shape
14 November 2002 The Linear Collider Alignment and Survey (LiCAS) Project 7