Warm and Cold Magnetic and Mechanical Alignment Tests of LHC Short Straight Sections

Abstract

This paper contains a summary of the results of the magnetic and mechanical alignment tests performed at CERN on the first 111 arc Short Straight Sections. These include the mechanical axis of the Cold Bore Tube at room temperature, the magnetic axis of main quadrupoles and correctors at both room and cryogenic temperature, and the field direction of the main quadrupoles. The measurements show that the quality of the assemblies is generally within the requirements for the machine.

A Device to Measure Magnetic and Mechanical Axis of Superconducting Magnets for the Large Hadron Collider at CERN

“…Mechanical axis (CBT centre). The resolution of the vertical and horizontal displacement detection is better than 0.01 mm, while the absolute accuracy including transfer to fiducials can be estimated about 0.11 mm from comparison with other instruments [7]. 3.…”