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Linear Colliders ILC and CLIC

Laser-Based Beam Diagnostics R&D Activities (Laser-wire)

The mission of the Laser-Based Beam Diagnostics (LBBD) Collaboration is to study the feasibility of laser-based diagnostics tools for the International Linear electron positron Collider (ILC). The objectives of the laser-wire project are to develop laser-based techniques for determining the dimensions of electron (positron) bunches at the ILC and optimising their application using simulations.


LiCAS is short for Linear Collider Alignment and Survey. The project aims to develop a survey system that can be used to align accelerator components during the build stage of the International Linear electron positron Collider to O(200 microns) over distances of O(600)m. Refraction prevents using optical methods in open air to align the components to the required accuracy. Instead, the plan is to do the survey in 25m overlapping lengths. Our system will therefore take the form of a 25m long survey train which will travel the 30km length of the tunnel establishing a coordinate system of reference marks against which the collider components will be surveyed. The train's internal co-ordinate measurement system operates in vacuum. It uses FSI (Frequency Scanning Interferometry) and LSM (Laser Straightness Monitors) to measure absolute co-ordinates. The group closely collaborates with the DESY metrology group and a first prototype will be tested at DESY soon.


The MONALISA project was aimed on development an accurate systems for monitoring and stabilisation of key components in and around accelerators. The activities are presently refocused to LiCAS.

Beam Delivery System

Simulations of the Linear Collider Beam Delivery System.

Beam Position Monitors

Coherent Diffraction Radiation


Activities towards demonstration of the compact final focus system at ATF2 in KEK


The F.O.N.T. (Feedback On Nano-second Timescales) project was set up to research, design and test an intra-train beam-based feedback system to achieve and maintain beam collisions, and therefore high luminosity, at a future electron-positron Linear Collider. It is one of the projects of the LC-ABD group which is part of the LCUK collaboration. We also participate through the TESLA Accelerator Physics and Design group.