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Proceedings Paper

Construction of CHESS compact undulator magnets at Kyma
Author(s): Alexander B. Temnykh; Aaron Lyndaker; Mirko Kokole; Tadej Milharcic; Jure Pockar; Raffaella Geometrante
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Paper Abstract

In 2014 KYMA S.r.l. has built two CHESS Compact Undulator (CCU) magnets that are at present installed and successfully operate at the Cornell Electron Storage Ring. This type of undulator was developed for upgrade of Cornell High Energy Synchrotron Source beam-lines, but it can be used elsewhere as well. CCU magnets are compact, lightweight, cost efficient and in-vacuum compatible. They are linearly polarized undulators and have a fixed gap. Magnetic field tuning is achieved by phasing (shifting) top magnetic array relative bottom. Two CCUs constructed by KYMA S.r.l. have 28.4 mm period, 6.5 mm gap, 0.93 T peak field. Magnetic structure is of PPM type, made with NdFeB (40UH grade) permanent magnet material. Transitioning from the laboratory to industrial environment for a novel design required additional evaluation, design adjusting and extensive testing. Particular attention was given to the soldering technique used for fastening of the magnetic blocks to holders. This technique had thus far never been used before for undulator magnet construction by industry. The evaluation included tests of different types of soldering paste, measurements of strength of solder and determining the deformations of the soldered magnet and holder under simulated loading forces. This paper focuses on critical features of the CCU design, results of the soldering technique testing and the data regarding permanent magnets magnetization change due to soldering. In addition it deals with optimization-assisted assembly and the performance of the assembled devices and assesses some of the results of the CCU magnets operation at CESR.

Paper Details

Date Published: 12 May 2015
PDF: 9 pages
Proc. SPIE 9512, Advances in X-ray Free-Electron Lasers Instrumentation III, 951205 (12 May 2015); doi: 10.1117/12.2186301
Show Author Affiliations
Alexander B. Temnykh, Cornell Univ. (United States)
Aaron Lyndaker, Cornell Univ. (United States)
Mirko Kokole, Kyma Tehnologija d.o.o. (Slovenia)
Tadej Milharcic, Kyma Tehnologija d.o.o. (Slovenia)
Jure Pockar, Kyma Tehnologija d.o.o. (Slovenia)
Raffaella Geometrante, Kyma s.r.l. (Italy)


Published in SPIE Proceedings Vol. 9512:
Advances in X-ray Free-Electron Lasers Instrumentation III
Sandra G. Biedron, Editor(s)

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