Author: Møller, S.P.
Paper Title Page
MOPEA003 Status and Very First Commissioning of the ASTRID2 Synchrotron Light Source 64
  • S.P. Møller, N. Hertel, J.S. Nielsen
    ISA, Aarhus, Denmark
  ASTRID2 is the new 10 nm UV and soft x-ray light source at Aarhus University. It will replace the ageing source ASTRID, which will be used as the full-energy (580 MeV) booster for ASTRID2. An upgrade of the beamlines at ASTRID are presentlytaking place before being transferred to ASTRID2 until the end of 2013. In addition new beamlines and insertion devices are being procured. Presently, ASTRID2 commissioning is alternating with ASTRID operation to continue during 2013. Status in spring 2013 includes operation of most sub-systems resulting in top-up mode operation to 150 mA. The lattice have been qualifies although a re-alignment is planned. The poster will present experiences from the first commissioning and give the status of the project.  
MOPEA004 Beam Lifetime in the ASTRID and ASTRID2 Synchrotron Light Sources: Excitations and Vacuum Dependences 67
  • J.S. Nielsen, N. Hertel, S.P. Møller
    ISA, Aarhus, Denmark
  The beam lifetime is a very important parameter for synchrotron light sources without top-up, and sometimes more important than the lowest possible vertical beam emittance. At the ASTRID synchrotron light source, we have for many years routinely applied a phase modulation of the accelerating RF field, together with a vertical excitation of the beam at the first vertical betatron frequency. These two effects increase the beam lifetime from about 3 hours to more than 100 hours at 150 mA. Lifetime measurements as function of modulation and excitation parameters will be presented. Additionally, measurements of the beam lifetime in ASTRID and ASTRID2 as function of vacuum pressure will be presented.  
MOPEA005 A Linear Beam Raster System for the European Spallation Source? 70
  • H.D. Thomsen, A.I.S. Holm, S.P. Møller
    ISA, Aarhus, Denmark
  The European Spallation Source (ESS) will, when built, be the most intense neutron source in the world. The neutrons are generated by a high power (5 MW) proton beam impacting a rotating W spallation target. To reduce the replacement frequency of components subjected to the full beam current, i.e. the proton beam window and the target, means to introduce low peak current densities, i.e. flat transverse beam profiles, are necessary. The relatively long beam pulse duration of 2.86 ms (at 14 Hz) leaves ample time to facilitate a Lissajous-like, linear raster system that illuminates a footprint area by sweeping an only moderately enlarged LINAC beamlet. Although slightly more technically challenging, this method has many advantages over the previously envisaged beam expander system based on non-linear DC magnets. The design, specifications, performance, and benefits of the beam raster system will be described and discussed.  
THPME001 Permanent Magnets in Accelerators can save Energy, Space, and Cost 3511
  • F. Bødker, L.O. Baandrup, A. Baurichter, N. Hauge, K.F. Laurberg, B.R. Nielsen, G. Nielsen
    Danfysik A/S, Taastrup, Denmark
  • O. Balling
    Aarhus University, Aarhus, Denmark
  • F.B. Bendixen, P. Kjeldsteen, P. Valler
    Sintex A/S, Hobro, Denmark
  • S.P. Møller, H.D. Thomsen
    ISA, Aarhus, Denmark
  • H.-A. Synal
    ETH, Zurich, Switzerland
  Green Magnet technology with close to zero electrical power consumption without the need for cooling water saves costs, space and hence spares natural resources. A compact dipole based on permanent magnets has been developed at Danfysik in collaboration with Sintex and Aarhus University. This first Green Magnet has been delivered to ETH Zurich for testing in a compact accelerator mass spectrometer facility. Permanent NdFeB magnets generate a fixed magnetic field of 0.43 T at a gap of 38.5 mm without using electrical power in the H-type 90° bending magnet with a bending radius of 250 mm. Thermal drift of the permanent magnets is passively compensated. Small air cooled trim coils permit fine tuning of the magnetic field. Magnetic field measurements and thermal stability tests show that the Green Magnet fully meets the magnetic requirements of the previously used electromagnet. The use of Green Magnet technology in other accelerator systems like synchrotron light sources is discussed.  
THPWA038 GEANT4 Studies of Magnets Activation in the HEBT Line for the European Spallation Source 3714
  • C. Bungau, R.J. Barlow, A. Bungau, R. Cywinski, T.R. Edgecock
    University of Huddersfield, Huddersfield, United Kingdom
  • P. Carlsson, H. Danared, F. Mezei
    ESS, Lund, Sweden
  • A.I.S. Holm, S.P. Møller, H.D. Thomsen
    ISA, Aarhus, Denmark
  The High Energy Beam Transport (HEBT) line for the European Spallation Source is designed to transport the beam from the underground linac to the target at the surface level while keeping the beam losses small and providing the requested beam footprint and profile on the target. This paper presents activation studies of the magnets in the HEBT line due to backscattered neutrons from the target and beam interactions inside the collimators producing unstable isotopes.