CERN Accelerating science

Article
Title	Tevatron Alignment Issues 2003-2004
Author(s)	Volk, James T ; Annala, Jerry ; Elementi, Luciano ; Gelfand, Norman M ; Gollwitzer, Keith ; Greenwood, John A ; Martens, Michael A ; Moore, Craig D ; Nobrega, Alfred ; Russell, Allison D ; Sager, Terry ; Shiltsev, Vladimir ; Stefanski, Raymond ; Syphers, Michael J ; Wojcik, George
Affiliation	(Fermilab, Batavia, Illinois)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2146
Subject category	Accelerators and Storage Rings
Abstract	It was observed during the early part of Run II that dipole corrector currents in the Tevatron were changing over time. Measurement of the roll for dipoles and quadrupoles confirmed that there was a slow and systematic movement of the magnets from their ideal position. A simple system using a digital protractor and laptop computer was developed to allow roll measurements of all dipoles and quadrupoles. These measurements showed that many magnets in the Tevatron had rolled more than 1 milli-radian. To aid in magnet alignment a new survey network was built in the Tevatron tunnel. This network is based on the use of free centering laser tracker. During the measurement of the network coordinates for all dipole, quadrupole and corrector magnets were obtained. This paper discusses roll measurement techniques and data, the old and new Tevatron alignment network.