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Walter, W.

Paper Title Page
WEPD017 Magnetic Measurements of the 1.5 m Coils of the ANKA Superconducting Undulator 3123
 
  • S. Casalbuoni, T. Baumbach, S. Gerstl, A.W. Grau, M. Hagelstein, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe
  • C. Boffo, W. Walter
    BNG, Würzburg
  
 

A 1.5 m long superconducting undulator with a period length of 15 mm is planned to be installed in ANKA middle 2010 to be the light source of the new beamline NANO for high resolution X-ray diffraction. The key specifications of the system are an undulator parameter K higher than 2 (for a magnetic gap of 5mm) and a phase error smaller than 3.5 degrees. In order to characterize the magnetic field properties of the superconducting coils local field measurements have been performed by moving a set of Hall probes on a sledge in a liquid helium bath: the results are reported.

  
WEPD020 Experimental Demonstration of Period Length Switching for Superconducting Insertion Devices 3132
 
  • A.W. Grau, T. Baumbach, S. Casalbuoni, S. Gerstl, M. Hagelstein, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe
  • C. Boffo, W. Walter
    BNG, Würzburg
  
 

One of the advantages of superconducting insertion devices (IDs) with respect to permanent magnet IDs is the possibility to enlarge the spectral range by changing the period length by reversing the direction of the current in a part of the windings. In this contribution we report the first experimental test of this principle demonstrated on a 70mm NbTi mock-up coil with period tripling, allowing to switch between a 15mm period length undulator and a 45mm wiggler.

  
WEPD021 Fabrication of the New Superconducting Undulator for the ANKA Synchrotron Light Source 3135
 
  • C. Boffo, W. Walter
    BNG, Würzburg
  • T. Baumbach, S. Casalbuoni, A.W. Grau, M. Hagelstein, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe
  
 

Superconducting insertion devices (IDs) are very attractive for synchrotron light sources since they allow increasing the flux and/or the photon energy with respect to permanent magnet IDs. Babcock Noell GmbH (BNG) completed the fabrication of a 1.5 m long unit for ANKA at KIT. The period length of the device is 15 mm for a total of 100.5 full periods plus an additional matching period at each end. The key specifications of the system are: a K value higher than 2 for a magnetic gap of 5 mm, the capability of withstanding a 4 W beam heat load and a phase error smaller than 3.5 degrees. The field performance of the magnets has been qualified with liquid helium in a vertical dewar. As a result of this test the local correction coils have been installed and the magnets inserted in the final cryostat. During the factory acceptance test, the conduction cooling operation has been qualified and at the moment the undulator is ready to be tested at KIT. This paper describes the main features of the system and the results of the factory acceptance tests.