FABRICATION OF MULTIPOLAR MAGNETIC-FIELD SOURCES

The emergence of high-energy-product permanent magnets has made possib le the generation of extraordinarily high magnetic fields in the inter nal working spaces of relatively small structures. The widespread use of such structures has been hampered by the variety and complexity of their magnetic components and the concomitant difficulty and expense o f manufacture. This paper describes approaches to fabrication and asse mbly that should significantly ease both fabricational and economic pr oblems. Examples of these approaches are given for the production of c ylindrical multipolar sources (magic rings, quadrupolar electron beam guides) and spherical dipolar sources (magic spheres).