Abstract
A simple scheme for field enhancement in synchrotron radiation sources such as undulators and wigglers is proposed, which is based on the fundamental nature of the superconducting loop where the magnetic flux is preserved. A superconductor ring placed to enclose the magnetic pole works as a kind of permanent magnet. The magnetization is performed by electromagnetic induction brought by the opening movement of the magnetic gap. Since neither additional external power supplies nor current leads are necessary, high-temperature bulk superconductors can easily be implemented in this scheme. Calculations to check the effectiveness of the new concept show that the critical current density of the superconductor is crucial to the performance of the synchrotron radiation sources based on this concept. Experiments were performed to verify the principle of the proposed scheme, which gave promising results to strongly support it.
Highlights
Permanent magnet (PM) synchrotron radiation (SR) sources such as undulators [1] have been utilized in many SR facilities [2 – 4] to generate quasimonochromatic intense SR
In order to explain the principle of the cryoundulator with SC permanent magnets, let us compare it to a simple scheme for field enhancement in electromagnets, which is based on the fundamental nature of the SC loop where the magnetic flux is preserved
The above experimental results strongly support the principle of cryoundulator plus’’ (CU plus) as a scheme to enhance the field of the cryoundulator; there are two important performances to be improved in the superconductors that we used in the experiments
Summary
Permanent magnet (PM) synchrotron radiation (SR) sources such as undulators [1] have been utilized in many SR facilities [2 – 4] to generate quasimonochromatic intense SR. The current trend in undulator developments is toward shortening the magnetic period to obtain SR with shorter wavelength [5,6,7,8]. Much effort has been made to develop short period undulators such as an in-vacuum undulator [9,10], a superconducting undulator (SCU) working around liquid helium temperature [11,12], and a cryogenic permanent magnet undulator (cryoundulator) [13]. The development of the SCU is still in progress since there are lots of technological problems, a thermal budget problem. The other is to increase the coercivity at least twice, which improves significantly the resistivity against demagnetiza-
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