Keyword: neutron
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TUA1IO03 Technological Challenges in the Path to 3.0 MW at the SNS Accelerator ion, operation, target, rfq 246
  • K.W. Jones
    ORNL, Oak Ridge, Tennessee, USA
  This talk discusses the design and anticipated challenges associated with upgrading the SNS beam power from the original 1.4 MW baseline design to the upgrade goal of 3 MW.  
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TUPOA10 Cyclotrons for Accelerator-Driven Systems ion, cyclotron, proton, target 305
  • T.-Y. Lee, J. Lee, S. Shin
    PAL, Pohang, Kyungbuk, Republic of Korea
  • C.U. Choi, M. Chung
    UNIST, Ulsan, Republic of Korea
  Accelerator-Driven system (ADS) can transmute long lived nuclear waste to short lived species. For this system to be fully realizable, a very stable high energy and high power proton beam (typically, 1 GeV beam energy and 10 MW beam power) is required, and preparing such a powerful and stable proton beam is very costly. Currently, the most promising candidate is superconducting linear accelerators. However, high power cyclotrons may be used for ADS particularly at the stage of demonstrating proof of principle of ADS. This paper discusses how cyclotrons can be used to demonstrate ADS.  
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WEPOA07 Neutrons and Photons Fluences in the DTL Section of the ESS Linac ion, DTL, linac, proton 703
  • L. Lari, R. Bevilacqua, R. Miyamoto, C. Pierre, L. Tchelidze
    ESS, Lund, Sweden
  • F. Cerutti, L.S. Esposito, L. Lari, A. Mereghetti
    CERN, Geneva, Switzerland
  • L.S. Esposito
    ADAM SA, Geneva, Switzerland
  The last section of the normal conducting front end of the ESS accelerator is composed by a train of 5 DTL tanks. They accelerate the proton beam from 3.6 until 90 MeV. The evaluation of the radiation field around these beam elements gives a valuable piece of information to define the layout of the electronic devices to be installed in the surrounding tunnel area. Indeed the risk of SEE and long term damage has to be considered in order to max-imize the performance of the ESS accelerator and to avoid possible long down time. A conservative loss distribution is assumed and FLUKA results in term of neutrons and photon fluence are presented.  
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WEPOA56 Design of RFQ Linac to Accelerate High Current Lithium Ion Beam from Laser Ion Source for Compact Neutron Source ion, rfq, linac, ion-source 820
  • S. Ikeda, T. Kanesue, M. Okamura
    BNL, Upton, Long Island, New York, USA
  Accelerator-driven compact neutron sources have been developed to conduct nondestructive inspection more conveniently and/or on the spot with lower cost than other neutron sources, such as spallation sources and nuclear reactors. In typical compact source, proton or deuteron are injected into Li or Be. To develop a higher flax source than conventional ones, we propose a source with 7Li beam generated by laser ion source using direct injection scheme (DPIS) into RFQ linac. Because of the higher velocity of center of mass than that in the case of proton beam injection, generated neutrons are more collimated. In addition, laser ion source with DPIS is expected to accelerate mA class fully ionized 7Li beam stably with simple setup, while it is difficult for conventional ion sources. The high collimation and high current are expected to lead to higher neutron flax. In this presentation, we present a design of RFQ linac optimized to accelerate such a high current beam with shorter distance.  
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THB3IO01 Development of a High Brightness Source for Fast Neutron Imaging* ion, target, optics, linac 1260
  • B. Rusnak, S.G. Anderson, D.L. Bleuel, M.L. Crank, P. Fitsos, D.J. Gibson, M. Hall, M.S. Johnson, R.A. Marsh, J.D. Sain, R. Souza, A. Wiedrick
    LLNL, Livermore, California, USA
  Funding: *This work performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
Lawrence Livermore National Lab is developing an intense, high-brightness fast neutron source to create high resolution neutron radiographs and images. An intense source (1011 n/s/sr at 0 degrees) of fast neutrons (10 MeV) allows: penetrating very thick, dense objects; maintaining high scintillator response efficiency; and remaining below the air activation threshold for (n,p) reactions. Fast neutrons will be produced using a pulsed 7 MeV, 300 microamp average-current commercial ion accelerator that will deliver deuterons to a 3 atmosphere deuterium gas cell. To achieve high resolution, a small (1.5 mm diameter) beam spot size will be used, and to reduce scattering from lower energy neutrons, a transmission gas cell will be used to produce a quasi-monoenergetic neutron beam. Because of the high power density of such a tightly focused, modest-energy ion beam, the gas target is a major engineering challenge that combines a 'windowless' rotating aperture, a rotary valve to meter cross-flowing high pressure gases, a novel gas beam stop, and recirculating gas compressor systems. A summary of the progress of the system design and building effort shall be presented.
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FRB2IO03 GEM*STAR Accelerator-Driven Subcritical System for Improved Safety, Waste Management, and Plutonium Disposition ion, proton, target, simulation 1300
  • M.A. Cummings, R.J. Abrams, R.P. Johnson, T.J. Roberts
    Muons, Inc, Illinois, USA
  Operation of high-power SRF particle accelerators at two US national laboratories allows us to consider a less-expensive nuclear reactor that operates without the need for a critical core, fuel enrichment, or reprocessing. A multipurpose reactor design that takes advantage of this new accelerator capability includes an internal spallation neutron target and high-temperature molten-salt fuel with continuous purging of volatile radioactive fission products. The reactor contains less than a critical mass and almost a million times fewer volatile radioactive fission products than conventional reactors like those at Fukushima. We describe GEMSTAR , a reactor that without redesign will burn spent nuclear fuel, natural uranium, thorium, or surplus weapons material. A first application is to burn 34 tonnes of excess weapons grade plutonium as an important step in nuclear disarmament under the 2000 Plutonium Management and Disposition Agreement **. The process heat generated by this W-Pu can be used for the Fischer-Tropsch conversion of natural gas and renewable carbon into 42 billion gallons of low-CO2-footprint, drop-in, synthetic diesel fuel for the DOD.  
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