Undulator light source with a compact slender and light frame based on a magnet technology developed for very-short-period undulators

Abstract We have developed a cancellation method of the strong magnetic attractive force acting between the undulator’s main magnets using repulsion magnets. This method is based on a plate magnet technology developed for the very-short-period undulators. Application of this method to the longer period length enables the construction of the XUV-FEL undulator, 2m long with a period length of 25mm.