Author: Saez de Jauregui, D.
Paper Title Page
THPC160 A Superconducting Switch for Insertion Devices with Variable Period Length 3266
 
  • T. Holubek, T. Baumbach, S. Casalbuoni, S. Gerstl, A.W. Grau, M. Hagelstein, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
  • C. Boffo, W. Walter
    BNG, Würzburg, Germany
 
  Superconducting insertion devices (IDs) are very attractive for synchrotron light sources since they offer the possibility to enhance the tuning range and functionality significantly by period length switching. Period length switching can be realized by employing two or more individually powerable subsets of superconducting coils and by reversing the current in a part of the winding. So far, the first demonstration mock-up coil allowing period length tripling was fabricated and tested successfully. Here, we report on the feasibility of a superconducting switch operating at 4.2 K, immersed in a liquid Helium bath as well as under conduction cooled conditions.  
 
THPC161 Possible Superconducting Insertion Devices with Period Length Doubling for Beamlines of Third Generation Light Sources 3269
 
  • D. Saez de Jauregui, T. Baumbach, S. Casalbuoni, S. Gerstl, A.W. Grau, M. Hagelstein, T. Holubek
    Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
 
  The tunability of an insertion device can be increased by period length switching, which in superconducting insertion devices (IDs) can be achieved by reversing the current in separately powered subsets of the superconducting windings. The feasibility of this concept has been experimentally proven. We study here different possibilities to tailor the needs of beamlines of third generation light sources: FEM simulations performed to compute the magnetic field on axis of such devices with different period lengths are reported together with the spectral simulations.  
 
THPC162 Possible Application of NbTi Wire with Artificial Pinning Centres for Insertion Devices 3272
 
  • T. Holubek, S. Casalbuoni, S. Gerstl, A.W. Grau, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
  • M. Klaeser, T. Schneider
    FZ Karlsruhe, Karlsruhe, Germany
  • L. Motowidlo
    SupraMagnetics, Inc., Plantsville, USA
 
  Superconductive insertion devices (IDs) allow higher fields for a given gap and period length compared to the classical permanent magnet IDs. This technological concept permits to increase the brilliance and/or the photon energy. The working horse for superconducting magnets are multifilament NbTi wires, which are nowadays also used for superconducting insertion devices. Even higher magnetic fields can be reached by using a conductor with enhanced critical current density. Here, we propose a possible application for superconducting undulators, wound with NbTi wire with artificial pinning centres, developed by SupraMagnetics, Inc. We report the critical current characteristic, Jc(B), of short wire measured in a liquid helium bath, and the load-line of a racetrack coil, designed to simulate the field configuration on the conductor as in a superconducting undulator. Based on the measured load-line we report the simulations of the magnetic field on axis and of the spectrum in a third generation light source of a possible undulator wound with a wire having similar properties of the measured one.  
 
THPC163 Local and Integral Field Measurement Setup for 2m Long Superconducting Undulator Coils 3275
 
  • A.W. Grau, T. Baumbach, S. Casalbuoni, S. Gerstl, M. Hagelstein, T. Holubek, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
 
  The performance of superconducting insertion devices depends strongly on their magnetic field quality. It is of fundamental importance to characterize the magnetic properties of insertion devices accurately before installation in synchrotron light sources. Thus a main part of the R&D program for superconducting insertion devices at the Karlsruhe Institute of Technology focuses on quality assessment. This contribution describes the instrumentation to perform magnetic measurements of the local field, of the field integrals and of the multipole components of superconducting undulator coils in a cold in vacuum (cryogen free) environment. It focuses on the outcome of the factory acceptance test together with results of first field measurements performed with mock-up coils.  
 
THPC159 Factory Acceptance Test of COLDDIAG: A Cold Vacuum Chamber for Diagnostics 3263
 
  • S. Gerstl, T. Baumbach, S. Casalbuoni, A.W. Grau, M. Hagelstein, T. Holubek, D. Saez de Jauregui
    Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
  • V. Baglin
    CERN, Geneva, Switzerland
  • C. Boffo, G. Sikler
    BNG, Würzburg, Germany
  • T.W. Bradshaw
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • R. Cimino, M. Commisso, A. Mostacci, B. Spataro
    INFN/LNF, Frascati (Roma), Italy
  • J.A. Clarke, R.M. Jones, D.J. Scott
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • M.P. Cox, J.C. Schouten
    Diamond, Oxfordshire, United Kingdom
  • I.R.R. Shinton
    UMAN, Manchester, United Kingdom
  • E.J. Wallén
    MAX-lab, Lund, Sweden
  • R. Weigel
    Max-Planck Institute for Metal Research, Stuttgart, Germany
 
  Superconductive insertion devices (IDs) have higher fields for a given gap and period length compared with the state-of-the-art technology of permanent magnet IDs. One of the still open issues for the development of superconductive insertion devices is the understanding of the heat intake from the electron beam. With the aim of measuring the beam heat load to a cold bore and the hope to gain a deeper understanding in the underlying mechanisms, a cold vacuum chamber for diagnostics was built. It is equipped with the following instrumentation: retarding field analyzers to measure the electron flux, temperature sensors to measure the beam heat load, pressure gauges, and mass spectrometers to measure the gas content. The flexibility of the engineering design will allow the installation of the cryostat in different synchrotron light sources. The installation in the storage ring of the Diamond Light Source is foreseen in November 2011. Here we report about the technical design of this device, the factory acceptance test and the planned measurements with electron beam.