bulk critical current density control method of the superconductor, and a manufacturing method of the undulator for bulk superconductors

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling the critical current density of a bulk superconductor which can significantly improve the performance of a pseudo-permanent magnet, etc. by improvement in and control of the critical current density of the entire bulk and also can be carried out using an existing accelerator and further can restrict a variation in the critical current densities of plural bulk superconductors to improve undulator performance, as well as a manufacturing method of a bulk superconductor used for undulators.;SOLUTION: Control of a critical current density is exerted by irradiating particle beams on a second-class superconductor in bulk form, whose energy is of a magnitude transmittable through the bulk body and lower than the generation threshold of columnar loss.;COPYRIGHT: (C)2012,JPO&INPIT