Publications by Mike Dawson


The MICE diffuser system

EPAC 2008 - Contributions to the Proceedings (2008) 2761-2763

M Apollonio, J Cobb, M Dawson, T Handford, P Lau, W Lau, J Tacon, M Tacon, S Yang

The Muon Ionization Cooling Experiment (MICE) [1] at the Rutherford Appleton Laboratory [2] will measure the performance of a cooling channel in a variety of configurations of momentum and initial emittance. Coverage in emittance-momentum space relies on the MICE diffuser, a system with five different thickness lead degraders, remotely operated in a high magnetic field. Degrader optimisation for beam matching and technical issues are discussed.


First data from the linear collider alignment and survey project (LiCAS)

EPAC 2008 - Contributions to the Proceedings (2008) 1344-1346

A Reichold, P Brockill, S Cohen, J Dale, M Dawson, T Handford, M Jones, G Moss, LA Rainbow, M Tacon, CU Estrada, D Urner, R Wastie, S Yang, J Prenting, M Schlösser, G Grzelak

The LiCAS project has developed a prototype robotic survey system for rapid and highly accurate surveying of long linear accelerator tunnel networks. It is aimed at the International Linear Collider (ILC). This Rapid Tunnel Reference Surveyor (RTRS) is an R & D instrument for evaluating the performance of the RTRS concept and its survey technology. The prototype has been commissioned in a test tunnel at DESY with initial calibrations and measurements ongoing. We will report recent results where they improve over previously reported work.


The optical alignment system of the ZEUS microvertex detector

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 580 (2007) 1227-1242

K Korcsak-Gorzo, G Grzelak, K Oliver, M Dawson, R Devenish, J Ferrando, T Matsushita, P Shield, R Walczak

The laser alignment system of the ZEUS microvertex detector is described. The detector was installed in 2001 as part of an upgrade programme in preparation for the second phase of electron-proton physics at the HERA collider. The alignment system monitors the position of the vertex detector support structure with respect to the central tracking detector using semi-transparent amorphous-silicon sensors and diode lasers. The system is fully integrated into the general environmental monitoring of the ZEUS detector and data has been collected over a period of 5 years. The primary aim of defining periods of stability for track-based alignment has been achieved and the system is able to measure movements of the support structure to a precision around 10 μ m. © 2007 Elsevier B.V. All rights reserved.


The LiCAS-RTRS - A survey system for the ILC

(2006)

A Reichold, M Dawson, J Green, Y Han, M Jones, G Moss, B Ottewell, C Perry, R Wastie, D Kaemtner, J Prenting, EO Saemann, M Schloesser, G Grzelak

The ILC requires an unprecedented accuracy and speed for the survey and alignment of its components. The Rapid Tunnel Reference Surveyor (RTRS) is a self-propelled survey train, intended to automatically survey a reference network in the ILC tunnels with a design accuracy of 200 (500) microns vertical (horizontal) over each 600 m segment [1]. A prototype RTRS has been built by the LiCAS collaboration. It will shortly commence operation at DESY. The operation principle and expected performance of the RTRS will be explained. The status of the project as well as the principles and performance of the underlying measurement technique will be described.