Development of the Next Generation
Superconductive Undulators for Synchrotron Light Sources

C. Boffo, T. Baumbach, A. Bernhard, M. Borlein, S. Casalbuoni,
A. Grau, M. Hagelstein, B. Kostka, E. Mashkina, P. Peiffer,
R. Rossmanith, W. Walter and D. Wollmann

Abstract—Superconducting insertion devices are very attractive for synchrotron light sources. For a given gap and period length, higher fields can be reached in respect to permanent magnet insertion devices thus permitting to reach higher photon fluxes.
A new R&D program has been recently launched at ANKA aiming for the development of the next generation superconducting insertion devices for light sources. A cold bore superconducting undulator (14 mm period length, 100 full periods long) is installed in the ANKA storage ring since three years. This will be replaced by an improved version which shows a more efficient cooling system and a high precision design aiming for reduced field errors. Under planning are two additional devices. One will allow to electrically switch the period length between 15 mm and 45 mm corresponding to an undulator and a wiggler mode, respectively. The other will be optimized for third generation light sources. It will be capable of tolerating higher beam heat loads up to 6 W while achieving very small field errors. The field error minimization will be obtained through the use of new shimming concepts which will correct inaccuracies due to manufacturing tolerances. This paper describes the technical concepts of the three projects.

Index Terms— Superconducting Magnet, Superconducting Undulator, Insertion device, NbTi, Cryogen Free.

Manuscript received 19 August 2008.
B. Boffo, M. Borlein, and W. Walter are with Babcock Noell GmbH, Alfred-Nobel-Str. 20, 97080 Würzburg, Germany (e-mail: cristian.boffo@babcocknoell.de,).
T. Baumbach, S. Casalbuoni, A. Grau, M. Hagelstein and R. Rossmanith are with ISS/ANKA, Research Center Karlsruhe, Herman-von-Helmholtz-Platz 1, Karlsruhe, Germany (e-mail: sara.casalbuoni@iss.fzk.de)
E. Mashkina and B. Kostka are with University of Erlangen-Nürnberg, Schlossplatz 4, 91054 Erlangen, Germany (e-mail: elena.mashkina@iss.fzk.de)
A. Bernhard, P. Peiffer and D. Wollmann are with University of Karlsruhe, postfach 6980, 76128 Karlsruhe, Germany (e-mail: axel.bernhard@iss.fzk.de)

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