TESTS OF PLANAR PERMANENT-MAGNET MULTIPOLE FOCUSING ELEMENTS

In recent work, planar configurations of permanent magnets were propos ed as substitutes fr conventional current-driven iron quadrupoles in a pplications limited by small aperture sizes and featuring small beam o ccupation diameters. Important examples include the configuring of foc using lattices in small-gap insertion devices, and the implementation of compact mini-beta sections on linear or machines. In subsequent ana lysis, this approach was extended to sextupoles and higher-order multi poles. In this paper we report initial measurements conducted at the S tanford Linear Accelerator Center on recently fabricated planar perman ent magnet quadruples and sextupoles configured out of SmCo and NdFe/B .