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| TUPPH015 |
Construction of Short Period APPLE II Type Undulators at SOLEIL
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265 |
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- F. Briquez, C. Benabderrahmane, O. V. Chubar, M.-E. Couprie, T. K. El Ajjouri, C. A. Kitegi, F. Marteau, A. Mary, K. Tavakoli, J. Vétéran
SOLEIL, Gif-sur-Yvette
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We present here the conception, construction and magnetic measurements of APPLE II type undulators of period 44 mm and 36 mm at SOLEIL. Such short period undulators are difficult to design and construct because of the little dimensions of the magnets, leading to small support structures which are more easily bent by the magnetic forces. The design of the support structures consists in individual aluminium holders grouped in assemblies of three or five magnets called modules and fixed on the girders using dovetails. Special extremity modules are designed to reduce field integrals of the undulator. The magnets are independently measured using Helmoltz coils and sorted in modules. Then the modules are measured using Hall probes and bodyless coil, and sorted to assemble the undulator. After assembling, a shimming is done to correct phase errors and field integrals, and a final correction of the integrals is made by little extremity magnets called "Magic Fingers". For each step of sorting, we use the home-made IDBuilder software, based on genetic algorithms. Short period undulators are of interest for the ARC-EN-CIEL project, which considers APPLE-II with a 30 mm period.
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