07 Accelerator Technology
T20 Targetry
Paper Title Page
TUPS036 High Energy Beam Impacts on Beam Intercepting Devices: Advanced Numerical Methods and Experimental Set-up 1614
 
  • A. Bertarelli, V. Boccone, F. Carra, F. Cerutti, A. Dallocchio, N. Mariani, M.A. Timmins
    CERN, Geneva, Switzerland
  • L. Peroni, M. Scapin
    Politecnico di Torino, Torino, Italy
 
  Funding: This work has been carried out through of the European Coordination for Accelerator Research and Development (EuCARD), co-sponsored by EU 7th Framework Program.
Beam Intercepting Devices are potentially exposed to severe accidental events triggered by direct impacts of energetic particle beams. State-of-the-art numerical methods are required to simulate the behavior of affected components. A review of the different dynamic response regimes is presented, along with an indication of the most suited tools to treat each of them. The consequences on LHC Tungsten Collimators of a number of beam abort scenarios were extensively studied, resorting to a novel category of numerical explicit methods, named Hydrocodes. Full shower simulations were performed providing the energy deposition distribution. Structural dynamics and shock wave propagation analyses were carried out with varying beam parameters, identifying important thresholds for collimator operation, ranging from onset of permanent damage up to catastrophic failure. Since the main limitation of these tools lies in the limited information available on constitutive material models under extreme conditions, a dedicated experimental program is proposed, relying on the HiRadMat test facility at CERN. Experimental aspects such as sample-holder design and test set-up are described.
 
 
TUPS044 Recent Developments on the IFMIF/EVEDA Beam Dump Cooling Circuit 1632
 
  • M. Parro, F. Arranz, B. Brañas, D. Iglesias, D. Rapisarda
    CIEMAT, Madrid, Spain
 
  During the IFMIF/EVEDA activities a conical dump made of copper has been designed to stop the 125 mA, 9 MeV, D+ beam. This element will receive a total power of ~1 MW. It is cooled by a high velocity water flow that circulates through an annular channel along the outer surface of the cone. The coolant composition must be defined taking into account corrosion and erosion phenomena. Also, as important neutron and gamma fluxes are generated in the beam stop, the activation of corrosion products and the water radiolysis must be considered. During commissioning of the accelerator, pulsed beams with low duty cycle will be used and therefore the power will be significantly lower than the nominal one. With the double aim of minimizing erosion and of reproducing the full power margin to local boiling (used as safety interlock) it is planned to use flows lower than the nominal one. This work will present the different operation scenarios and the coolant composition choice performed.  
 
TUPS045 IFMIF/EVEDA Beam Dump Shielding: Optimized Design of the Front Part 1635
 
  • M. García, D. Lopez, A. Mayoral, F. Ogando, J. Sanz, P. Sauvan
    UNED, Madrid, Spain
  • J.M. Arroyo, B. Brañas
    CIEMAT, Madrid, Spain
 
  The Beam Dump of the IFMIF/EVEDA accelerator prototype, designed to stop deuteron beam with energy up to 9 MeV and a maximum beam power of 1.12 MW, needs to fulfill radioprotection requirements. The deuteron beam collides with the beam stop and neutron and photon sources are produced. The objective of this paper is to design and justify the front part of the local shielding of the Beam Dump that complies with radiation limits for workers during beam-off phases. This shielding must allow unrestricted maintenance operations inside the vault, where the accelerator is located, after a reasonable cooling time after shutdown. In doing so, two main handicaps have been overcome. On one hand, the reliability of the traditionally used Monte Carlo codes such as MCNPX and PHITS has demonstrated to be very poor for deuteron transport at these low energies. In order to solve this lack, the MCUNED code using TENDL library is proposed to be used for deuteron transport and the prediction of the neutron and photon sources. On the other hand, the lack of space in the area dedicated to the last part of the accelerator demands a specially optimized shielding solution.  
 
TUPS048 Equipment and Techniques for the Replacement of the ISIS Proton Beam to Target Window 1638
 
  • S.D. Gallimore, S.J.S. Jago
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  The ISIS Spallation Neutron Source has been in operation at the Rutherford Appleton Laboratory for over 25 years. Much of the original equipment installed during the construction of the facility is still in operation. The window separating the proton beam transfer line from the neutron target is a key component in the accelerator complex. During the operational life of the Beam Entry Window it has absorbed a considerable amount of energy deposited from the proton beam as it passes from the accelerator vacuum to the target area. Due to the difficulties in accessing and handling the window assembly, a decision was made to replace this component in a planned maintenance period. This paper describes the specialist remote handling equipment and techniques that were developed during the 3 year build up to the removal and replacement of the of the highly active Beam Entry Window.  
 
TUPS050 Target Optimisation Studies for MuSR Applications 1641
 
  • A. Bungau, C. Bungau, R. Cywinski
    University of Huddersfield, Huddersfield, United Kingdom
  • P.J.C. King, J.S. Lord
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
 
  Considering the ISIS muon target as a reference, Geant4 simulations have been performed to optimise the target parameters with respect to muon and pion yield. Previous studies suggested that the muon production can be optimised by using a thin graphite slab target with an incident proton energy significantly lower than initially considered. The current paper discusses a possible target design fully optimised for MuSR studies.  
 
TUPS051 Design and Performance of the MICE Target* 1644
 
  • C.N. Booth, P. Hodgson, E. Overton, M. Robinson, P.J. Smith
    Sheffield University, Sheffield, United Kingdom
  • G.J. Barber, K.R. Long
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • E.G. Capocci, J.S. Tarrant
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • B.J.A. Shepherd
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
 
  Funding: UK Science and Technology Facilities Council
The MICE experiment uses a beam of low energy muons to study ionisation cooling. This beam is derived parasitically from the ISIS synchrotron at the Rutherford Appleton Laboratory. A mechanical drive has been developed which rapidly inserts a small titanium target into the beam after acceleration and before extraction, with minimal disturbance to the circulating protons. One mechanism has operated in ISIS for over half a million pulses, and its performance will be summarised. Upgrades to this design have been tested in parallel with MICE operation; the improvements in performance and reliability will be presented, together with a discussion of further future enhancements.
 
 
TUPS053 A Target Magnet System for a Muon Collider and Neutrino Factory 1650
 
  • H.G. Kirk
    BNL, Upton, Long Island, New York, USA
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  • N. Souchlas, R.J. Weggel
    Particle Beam Lasers, Inc., Northridge, California, USA
 
  Funding: This work is supported in part by the US DOE Contract NO. DE-AC02-98CH10886.
The target system envisioned for a Muon Collider or Neutrino Factory includes a 20-T solenoid field surrounding a mercury jet target with the field tapering to 1.5 T 15 m downstream of the target. A principal challenge is to shield the superconducting magnets from the radiation issuing from the 4-MW proton beam impacting the target. We describe a solution which will deliver the desired field while being capable of tolerating the intense radiation environment surrounding the target.
 
 
TUPS054 Beam-power Deposition in a 4-MW Target Station for a Muon Collider or a Neutrino Factory 1653
 
  • H.G. Kirk
    BNL, Upton, Long Island, New York, USA
  • J.J. Back
    University of Warwick, Coventry, United Kingdom
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  • N. Souchlas, R.J. Weggel
    Particle Beam Lasers, Inc., Northridge, California, USA
 
  Funding: This work is supported in part by the US DOE Contract NO. DE-AC02-98CH10886.
We present the results of power deposition in various components of the baseline target station of a Muon Collider or a Neutrino Factory driven by a 4-MW proton beam.