Design, tests and commissioning of the EMMA injection septum

Abstract

The paper describes the main steps taken during the design and commissioning stages of the EMMA injection and extraction septum magnets. A preliminary analysis of the problem is presented first followed by a discussion of the results obtained through finite element magnetic modeling and design optimization. The measures taken to suppress the stray field generated by the magnet are discussed in detail. Two sets of tests are performed on the magnet: magnetic field measurement resulting in a three-dimensional magnetic field map and measurement of the electron beam bending angle as a function of the magnet current. The values of the effective magnetic length resulting from the two sets of measurement are found to be in excellent agreement.