The Insertion Device Group develops insertion devices for use at accelerator and synchrotron facilities. The group pioneered the development of superconductive undulators and was the first worldwide to test them with beam.
Since 2007 the insertion device group activities are focused on the development of superconducting planar insertion devices in collaboration with the industrial partner Babcock Noell GmbH . The group efforts concentrate as well in developing instruments and tools for quality assessment of the magnetic field of superconducting undulators and for understanding the beam heat load mechanisms in a cold bore. In order to fulfill this last task the group is leading a large collaboration, with Babcock Noell GmbH , CERN, Diamond Light Source, Frascati National Laboratory, Rome University “La Sapienza,” STFC Daresbury Laboratory, STFC Rutherford Appleton Laboratory, University of Manchester, Cockcroft Institute of Science and Technology, and Lund University MAX-Lab all participating for the project COLDDIAG, a cold vacuum chamber for diagnostics. The group is also responsible of integrating the new superconducting insertion devices in the storage ring and synchrotron at Karlsruhe Institute of Technology (KIT).
|Motivation R&D of superconducting insertion devices|
|In order to produce synchrotron radiation of highest brilliance third generation synchrotron sources make use of insertion devices (IDs). The state of the art available today for IDs is the permanent magnet technology with magnet blocks placed inside the vacuum of the storage ring. Following an initial proposal at SPRING8 , the concept of cryogenic permanent magnet undulators (CPMU) is presently considered as a possible future evolution of in-vacuum undulators (IVU) [2-5]. Superconducting undulators can reach, for the same gap and period length, higher fields even with respect to CPMU devices, allowing to increase the spectral range and the brilliance.
Below is shown the comparison of the performance of a SCU, a CPMU  and an IVU considering the same magnetic length and the same vacuum gap. A given photon energy can be reached by the SCU with lower order harmonic: 20 keV can be reached with the 5th harmonic of the SCU, with the 7th harmonic of the CPMU and with the 9th harmonic of the IVU. Therefore, it is possible with a SCU to relax the beam properties and/or the magnetic field quality.
| T. Hara, T. Tanaka, H. Kitamura, T. Bizen, X. Marchal, T. Seike, T. Kohda, and Y. Matsuura, Phys. Rev. ST Accel. Beams 7, 050702 (2004).
 C. Kitegi, J. Chavanne, D. Cognie, P. Elleaume, F. Revol,C. Penel, B. Plan, and M. Rossat, in Proceedings of the10th European Particle Accelerator Conference, Edinburgh, Scotland, 2006 (EPS-AG, Edinburgh, Scotland, 2006).
 T. Tanabe, D. A. Harder, G. Rakowsky, T. Shaftan, and J. Skaritka, in Proceedings of the 2007 Particle Accelerator Conference, Albuquerque, New Mexico (IEEE, Albuquerque, New Mexico, 2007).
 C. Benabderrahmane, N. Bchu, P. Berteaud, M. E. Couprie, J. M. Filhol, C. Herbeaux, C. Kitegi, J. L. Marlats, K. Tavakoli, and A. Mary, in Proceedings of the 11th European Particle Accelerator Conference, Genoa, 2008 (EPS-AG, Genoa, Italy, 2008).
 J. Chavanne, M. Hahn, R. Kersevan, C. Kitegi, C. Penel, and F. Revol, in Proceedings of the 11th European Particle Accelerator Conference, Genoa, 2008 (EPS-AG, Genoa, Italy, 2008).