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David Buscher edited untitled.tex
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\section{Introduction}
The Automated Alignment System (AAS) and Back End Active Stabilization of Shear and Tilt (BEASST) together have been proposed to align the beam trains in the MROI and to keep these aligned during the night.
The A design for the AAS
has been went through a
Preliminary Conceptual Design Review (CDR) and some subsystems have been prototyped. We propose here a modification to the AAS concept which will allow the existing goals to be met while addressing drifts in alignment during the night more rapidly and robustly. At the same time, some of the constraints on the BEASST system can be relaxed, allowing a higher-performance system to be built more quickly.
In the following we recall the original goals and concept and outline the proposed modification. The advantages and disadvantages of this modification are then discussed and a way forwards proposed.
\section{Functional requirements}
The functions of the combined AAS and BEASST systems (hereafter collectively referred as ``the AAS'' since they can be considered to be a single system addressing alignment needs) can be briefly described as: