Author: Møller, S.P.
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MOPRO050 Status of the ASTRID2 Synchrotron Light Source 197
 
  • J.S. Nielsen, N. Hertel, S.P. Møller
    ISA, Aarhus, Denmark
 
  With regular user beam delivered to experiments, the commissioning of the ASTRID2 synchrotron light source is now mostly completed. The ring is running stable in top-up mode for beam currents up to 90 mA, with a lifetime of ~0.8 h at 90 mA. The orbit is controlled by a 10 Hz feedback loop, which includes feed forward loops when the insertion devices change gap. A similar 10 Hz loop compensates tune and beta function changes from the insertion devices. Some issues are still remaining. These include installation of a Landau cavity for lifetime improvements, a reduction in the heating of the in-vacuum ferrites of the injection bumpers, and a shielding of the stray magnetic field from the booster dipoles.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOPRO050  
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TUPRO080 Experience with a NdFeB based 1 Tm Dipole 1226
 
  • 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
  • N. Hertel, S.P. Møller, J.S. Nielsen, H.D. Thomsen
    ISA, Aarhus, Denmark
 
  Funding: *Work supported by The Danish National Advanced Technology Foundation
A 30° Green Magnet based on permanent NdFeB magnets has been developed and installed in the injection line at the ASTRID2 synchrotron light source. The cost efficient design is optimized for a 1 T field at a length of 1 m using shaped iron poles to surpass the required field homogeneity. The inherent temperature dependence of NdFeB has been passively compensated to below 30 ppm/°C. A study of potential demagnetization effects has been performed by irradiation of NdFeB samples placed directly in a 100 MeV e-beam. A high permanent magnet work point was found to result in enhanced robustness, and the risk of demagnetization was found to be negligible for typical synchrotron applications. The magnet has successfully been in operation at ASTRID2 since autumn 2013.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO080  
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WEPRO072 The Design of the Fast Raster System for the European Spallation Source 2118
 
  • H.D. Thomsen, S.P. Møller
    ISA, Aarhus, Denmark
 
  The ESS will nominally operate with an average (peak) proton current of 2.5 mA (62.5 mA) at 2.0 GeV. To reduce the beam peak current density at the spallation target, the ESS HEBT will apply a fast transverse raster system consisting of 8 dithering magnet dipoles. The raster system sweeps the linac beamlet on the target surface and gives a rectangular intensity outline within a macropulse of 2.86 ms. The magnets are driven by triangular current waveforms of up to 40 kHz. The preliminary magnet design and power supply topology will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO072  
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WEPRO073 The ESS High Energy Beam Transport after the 2013 Design Update 2121
 
  • H.D. Thomsen, S.P. Møller
    ISA, Aarhus, Denmark
 
  Following an optimization of the European Spallation Source (ESS) linac, a number of changes have been introduced in the High Energy Beam Transport (HEBT). In particular, about 120 m of beam transport has been allocated to enable an extension of the superconducting linac, thus providing some contingency against poor linac performance and potentially allowing a future beam power upgrade. The changes in layout and beam optics in all HEBT lines will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO073  
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WEPRO074 Performance of the ESS High Energy Beam Transport under Non-nominal Conditions 2124
 
  • H.D. Thomsen, S.P. Møller
    ISA, Aarhus, Denmark
 
  With a nominal beam power of 5 MW, the demands for low relative beam losses in the ESS linac are unprecedented. In the HEBT, where the beam first reaches full power, this is especially relevant. The acceptance of the HEBT should thus encompass beams of non-nominal parameters and ideally be tolerant to partial hardware failure for at least a pulse train of 2.86 ms. In this paper, the sensitivity towards errors in beam parameters and optical elements will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO074  
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THPME043 The ESS Linac 3320
 
  • M. Eshraqi, H. Danared, R. De Prisco, M. Lindroos, D.P. McGinnis, R. Miyamoto, M. Muñoz, A. Ponton, E. Sargsyan
    ESS, Lund, Sweden
  • I. Bustinduy
    ESS Bilbao, Bilbao, Spain
  • L. Celona
    INFN/LNS, Catania, Italy
  • M. Comunian, F. Grespan
    INFN/LNL, Legnaro (PD), Italy
  • S.P. Møller, H.D. Thomsen
    ISA, Aarhus, Denmark
 
  The European Spallation Source, ESS, uses a linear accelerator to bombard the tungsten target with the high intensity protons beam for producing intense beams of neutrons. The nominal average beam power of the linac is 5~MW with a peak beam power at target of 125~MW. During last year the ESS linac was costed, and to meet the budget a few modifications were introduced to the linac design. One of the major changes is the reduction of final energy from 2.5~GeV to 2.0~GeV and therefore beam current was increased accordingly to compensate for the lower final energy. As a result the linac is designed to meet the cost objective by taking a higher risk. This paper focuses on the driving forces behind the new design, engineering and beam dynamics requirements of the design and finally on the beam dynamics performance of the linac.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME043  
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