91̽»¨

Abstract:

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.

Abstract:

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.

Abstract:

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 91̽»¨ 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 91̽»¨ structure to a precision around 10 μ m. © 2007 Elsevier B.V. All rights reserved.