Use of Servomechanisms in the Compensation of a 70-Mv X-Ray Beam

Abstract
The naturally peaked x‐ray beam from the 70‐Mev synchrotron has been collimated and compensated to flatness by differential absorption in a copper filter. Angulation of the synchrotron magnet produces a shift of the filter support with respect to the x‐ray beam, thus altering the compensation achieved before angulation. This paper contains a description of a system of two servomechanisms which senses the change in compensation and provides correcting motions to restore proper filter position. Particular emphasis is given to items of technique which contributed to the success of this development.