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Lettry, J.

Paper Title Page
MOPC087 The MERIT (nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS 262
 
  • I. Efthymiopoulos, A. Fabich, A. Grudiev, F. Haug, J. Lettry, M. Palm, H. Pernegger, R. R. Steerenberg
    CERN, Geneva
  • J. R.J. Bennett
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • O. Caretta, P. Loveridge
    STFC/RAL, Chilton, Didcot, Oxon
  • A. J. Carroll, V. B. Graves, P. T. Spampinato
    ORNL, Oak Ridge, Tennessee
  • H. G. Kirk, H. Park, T. Tsang
    BNL, Upton, Long Island, New York
  • K. T. McDonald
    PU, Princeton, New Jersey
  • N. V. Mokhov, S. I. Striganov
    Fermilab, Batavia, Illinois
  
  The MERIT (nTOF-11) experiment is a proof-of-principle test of a target system for high power proton beams to be used as a front-end for a neutrino factory complex or a muon collider. The experiment took data in autumn 2007 using the fast extracted beam from the CERN Proton Synchrotron (PS) with a maximum intensity of about 30TP per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field Such a field is required to capture the low-energy secondary pions which will provide the source of the required intense muon beams. Particle detectors have been installed around the target setup in order to measure the secondary particle flux out of the target and probe cavitation effects in the mercury jet when hit with variable intensity beams. The data analysis is ongoing: the results presented at this conference will demonstrate the validity of the liquid mercury target concept.

For the MERIT collaboration.

 
MOPC090 Driver Beam-led EURISOL Target Design Constraints 271
 
  • E. Noah, R. Catherall, Y. Kadi, C. Kharoua, J. Lettry, T. Stora
    CERN, Geneva
  
  The EURISOL (European Isotope Separation Online) Design Study is addressing new high power target design challenges. A three-step method* was proposed to split the high power linac proton driver beam into one H- branch for the 4 MW mercury target that produces radioactive ion beams (RIB) via spallation neutron-induced fission in a secondary actinide target and three 100 kW H+ branches for the direct targets producing RIBs via fragmentation and spallation reactions. This scheme minimises transient thermo-mechanical stresses on targets and preserves the cw nature of the driver beam in the four branches. The heat load for oxides, carbides, refractory metal foils and liquid metals is driven by the incident proton driver beam while for actinides, exothermic fission reactions are an additional contribution. This paper discusses the constraints that are specific to each class of material and the target design strategies. An emphasis is placed on the modern engineering numerical tools and experimental methods used to validate the target designs.

*A. Facco, R. Paparella, D. Berkovits, Isao Yamane, "Splitting of high power, cw proton beams", Physical Review Special Topics - Accelerators and Beams (2007).

 
WEPP169 The MERIT High-power Target Experiment at the CERN PS 2886
 
  • H. G. Kirk, H. Park, T. Tsang
    BNL, Upton, Long Island, New York
  • J. R.J. Bennett
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • O. Caretta, P. Loveridge
    STFC/RAL, Chilton, Didcot, Oxon
  • A. J. Carroll, V. B. Graves, P. T. Spampinato
    ORNL, Oak Ridge, Tennessee
  • I. Efthymiopoulos, A. Fabich, F. Haug, J. Lettry, M. Palm, H. Pereira
    CERN, Geneva
  • K. T. McDonald
    PU, Princeton, New Jersey
  • N. V. Mokhov, S. I. Striganov
    Fermilab, Batavia, Illinois
  
  The MERIT experiment was designed as a proof-of-principle test of a target system based on a free mercury jet inside a 15-T solenoid that is capable of sustaining proton beam powers of up to 4MW. The experiment was run at CERN in the fall of 2007. We describe the results of the tests and their implications.