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 b... https://danddcollectiblers.shop/product-category/cookie-jar/