Author: Møller, S.P.
Paper Title Page
TUPC066 Charged Particle Beam Profile Detector based on Yb-doped Optical Fibers 1150
 
  • C.S. Søndergaard
    Aarhus University Hospital, Aarhus, Denmark
  • A. Baurichter, B.R. Nielsen
    Danfysik A/S, Jyllinge, Denmark
  • G. Boudreault
    Rigshospitalet Copenhagen, PET and Cyclotron Unit, Copenhagen, Denmark
  • K. Hansen, D.V. Madsen, J. Rasmussen, B.F. Skipper
    Aarhus School of Engineering, Aarhus, Denmark
  • M. Kristensen
    Aarhus University, Aarhus, Denmark
  • S.P. Møller
    ISA, Aarhus, Denmark
  • A. Peters
    HIT, Heidelberg, Germany
 
  Funding: The Danish National Advanced Technology Foundation, contract # 002-2005-1
A radiation robust, high dynamic range beam profile detector based on scintillating fibers will be presented. The beam profile detector has been developed for particle therapy type ion beams of multiple hundreds MeV/n in the intensity range from 105 to 109 ions/s as a simple and less expensive replacement for MWPC based detectors. Scintillating fibers are typically based on doped polymers, which are sensitive to radiation damage. Here we report on the advantage of using silica optical fibers doped with rare-earth elements for the purpose of detecting ionizing radiation. Specifically, we find that ytterbium doped fibers generate a strong emission signal in the near-infrared from the Yb3+ state when penetrated by ionizing radiation, and that the emission has a high resistance against the accumulated dose in the fiber. We demonstrate the use of such fibers in a beam profile detector for charged particle beams in medical applications (radionuclide production and hadron therapy); more generally they are a promising alternative for prolonged used in ionizing radiation, such as accelerator diagnostics equipment or space applications.
 
 
THPC003 Installation of the ASTRID2 Synchrotron Light Source 2909
 
  • J.S. Nielsen, N. Hertel, S.P. Møller
    ISA, Aarhus, Denmark
 
  ASTRID2 is the new 10 nm UV and soft x-ray light source being built at Aarhus University, to replace the aging source ASTRID. ASTRID2 is now in the middle of its installation. An update of the design will be presented. Almost all components have now been acquired and received. Several choices and solutions of hardware will be described, and future commissioning plans outlined. Commissioning is expected to take place in the winter 2011/2012.  
 
THPS031 The Beam Expander System for the European Spallation Source 3487
 
  • H.D. Thomsen, A.I.S. Holm, S.P. Møller
    ISA, Aarhus, Denmark
 
  At the European Spallation Source (ESS), neutrons are produced by high energy (2.5 GeV) protons impinging on a target. The lifetime of the target is highly dependent on the beam footprint. In general, the lower the average current density, the longer the lifetime of the target will be. A detailed study of two different expander systems suggested to be used to obtain the desired beam footprint has been undertaken. For reference, a system of quadrupole defocusing is used. The two systems under study are expansion of the beam by magnetic multipoles and raster scanning (painting) of the narrow linac beam over the target area. The designs, specifications, and comparative risks of the three systems will be described.  
 
THPS050 The High Energy Beam Transport System for the European Spallation Source 3538
 
  • A.I.S. Holm, S.P. Møller, H.D. Thomsen
    ISA, Aarhus, Denmark
 
  As part of the accelerator design update for the European Spallation Source (ESS), we present results from a detailed study of the High Energy Beam Transport (HEBT) line. The HEBT is a transport line around 100 m long, which connects the 2.5-GeV linac to the target. The linac will deliver a current of 50 mA, a pulse length of 2 ms and a repetition rate of 20 Hz, and losses are of utmost importance. Presumably, the HEBT will continue the 10 m period focusing structure of the linac. Two bends – overall, achromatic – will be needed to connect the different vertical levels between the linac and the target. A number of design aspects will be discussed here: space for future linac cryostats, the need and location for collimation, the location of the tuning beam dump and the associated beam optics, and the beam expander system, which provide the desired beam footprint on the target (see also separate contribution). A proposed design including options will be described together with hardware specifications.