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Flux-trap magnets based on high-temperature superconductors were studied for their potential as electronbeam control elements. Applications could include accelerators, Superconducting Rings Solenoid 1 klystrons, and mm-wave amplifiers. We have constructed compact magnets using bulk YBCO crystals that exhibit axial fields of 1.0 -1.2 T at operating temperatures from 65K to 77K.Transverse fields and field stability have also been measured. Finally, methods and mechanisms involved in pulse-charging the superconducting rings will be discussed.

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