Abstract
A new two-magnet doubly achromatic configuration has been found which especcially suitable for low energy electron linac beams (5–50 MeV) with large energy spread (20%). It consists of two zero-field index (n = 0) magnets separated by a small drift distance, D. The first bending angle, θ1, is slightly more than 180° and the second, θ2, less than 90°. The doubly achromatic conditions can be satisfied in practice for total bending angles between 230° and 290°. The configuration has the specific advantage over all other doubly achromatic systems of minimizing the magnet dimension in the direction opposite to the exit trajectory. This is particularly desirable in a high energy electron accelerator-based cancer therapy system, for it minimizes “head clearance”.
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