Positron flux concentrator - an update

The type of concentrator that has been under study (on and off) for the last two years is shown. The work was started by Dave Sherden and Co., and the object of the study was (and still is) to determine the correct parameters which will give the correct field in the central region which captures the maximum number of e/sup +/'s from the target. This note contains two sections. The first is a simplified model which seems to agree with most of the measurements carried out. The second describes the set up, a typical example of the field's shape and amplitude and the electrical requirements for the final concentrator