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Description
Short-period, high-field undulators are widely used on modern SR sources to generate high-intensity coherent radiation. In order to achieve the stability of the properties and the quality of the radiation received in undulators magnetic field of ID has to meet very tough tolerances, which depend on the accuracy of the arrangement of magnets in the assembly. Such tolerances can be achieved by adjusting each magnetic element [1].
This paper presents the results of numerical simulation of an undulator U27 based on rare-earth permanent magnets (REPM) for the project of an accelerator-storage complex of a synchrotron radiation source with a free electron laser "SYLA". Geometry of magnet elements for different periods was optimized to produce the highest on-axis field. The magnetic field in such an undulator is calculated via a computer simulation using RADIA and analyzed, as well as the inhomogeneities of its components in the transverse plane. The report discusses the requirements for the accuracy of setting [2] and positioning of magnetic elements by angle and coordinate, as well as existing methods for implementing these requirements.
Further, design solutions are proposed to achieve the necessary accuracy of magnet arrangement, including an automatic adjustment system and an adjustment robot. Special attention is paid to the design of the system on flexible elements, its various configurations are offered, as well as the method of their semi-automatic selection.
The report examines the advantages and disadvantages of each configuration, and will also present the results of the assembly and the first tests of the undulator layout.
