Author: Johnson, R.P.
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TUPMB026 Magnet System for a Compact Microtron 1164
 
  • S.A. Kahn, R.J. Abrams, M.A.C. Cummings, R.P. Johnson, G.M. Kazakevich
    Muons, Inc, Illinois, USA
 
  Funding: Funded by DOE SBIR grant DE-SC0013795
A compact microtron can be an effective gamma source that can be transported to locations outside the laboratory. As part of a Phase I project we have studied a portable microtron that can accelerate electrons with energies of 6 MeV and above as a source for gamma and neutron production. The mass of the magnet is a significant contribution to the overall mass of the system. This paper will discuss conceptual designs for both permanent magnet and electromagnet systems. The choice of mictrotron RF frequency range is determined by the application requirements. The RF frequency influences the size of the microtron magnet and consequently its weight. We have looked at how the design would vary with the different frequency configurations.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB026  
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TUPMY009 MuSim, a Graphical User Interface for Multiple Simulation Programs 1559
 
  • T.J. Roberts, M.A.C. Cummings, R.P. Johnson
    Muons, Inc, Illinois, USA
  • D.V. Neuffer
    Fermilab, Batavia, Illinois, USA
 
  MuSim is a new user-friendly program designed to interface to many different particle simulation codes, regardless of their data formats or geometry descriptions. It presents the user with a compelling graphical user interface that includes a flexible 3-D view of the simulated world plus powerful editing and drag-and-drop capabilities. All aspects of the design can be parametrized so that parameter scans and optimizations are easy. It is simple to create plots and display events in the 3-D viewer (with a slider to vary the transparency of solids), allowing for an effortless comparison of different simulation codes. Simulation codes: G4beamline, MAD-X, and MCNP; more coming. Many accelerator design tools and beam optics codes were written long ago, with primitive user interfaces by today's standards. MuSim is specifically designed to make it easy to interface to such codes, providing a common user experience for all, and permitting the construction and exploration of models with very little overhead. For today's technology-driven students, graphical interfaces meet their expectations far better than text-based tools, and education in accelerator physics is one of our primary goals.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY009  
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TUPOY029 Gem*Star Consortium Proposal to Build a Demonstration Accelerator Driven System 1973
 
  • R.P. Johnson, R.J. Abrams, M.A.C. Cummings, T.J. Roberts
    Muons, Inc, Illinois, USA
  • R.B. Vogelaar
    Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
 
  The GEM*STAR Consortium of four companies, two universities, and two US national laboratories has formed Mu*STAR, a new company, to fund and build a profitable pilot plant to demonstrate the advantages of subcritical molten-salt-fueled nuclear reactors driven by superconducting RF proton linacs. The GEM*STAR multipurpose reactor design features new accelerator power capabilities, an internal spallation neutron target, and high temperature molten salt fuel with continuous purging of volatile radioactive fission products such that the reactor contains less than a critical mass and almost a million times fewer volatile radioactive fission products than conventional reactors. GEM*STAR is a reactor that without redesign will burn spent nuclear fuel (SNF), natural uranium, thorium, or surplus weapons material. It will operate without the need for a critical core, fuel enrichment, or reprocessing, making it an excellent design overall, and a strong candidate for export. We describe the design and plans for funding a pilot plant that could profitably dispose of excess weapons-grade plutonium.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY029  
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TUPOY043 GEM*STAR Accelerator-Driven Subcritical System for Improved Safety, Waste Management, and Plutonium Disposition 1998
 
  • M.A.C. Cummings, 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.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY043  
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TUPOY050 Microtron-based Intense Neutron Source 2014
 
  • G.M. Kazakevich, R.J. Abrams, R.P. Johnson, S.A. Kahn
    Muons, Inc, Illinois, USA
  • M.A.C. Cummings
    Northern Illinois University, DeKalb, Illinois, USA
 
  Funding: Funded by DOE SBIR grant DE-SC0013795
An L-Band 7.7-9.8 MeV CW relatively inexpensive microtron with a warm accelerating cavity for multi-purpose applications in nuclear medicine and radiation industry is proposed. The microtron with a photo-neutron converter is intended to serve as an intense source of photo-neutrons with yield up to 4·1012 n/s for nuclear medicine or/and producing of short lived isotopes, as a source of gamma-radiation with dose rates up to 130 kR/min·m with a heavy bremsstrahlung target, and as a source of the electron beam with total energy of 9.8 MeV at the average current up to 4.4 mA for various radiation treatments.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOY050  
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WEIB06 Industry Role for Advanced Accelerator R&D 2114
 
  • R.P. Johnson
    Muons, Inc, Illinois, USA
 
  Besides large research institutes which typically focus on fundamental research, industrial companies can also contribute to the development of advanced applications of accelerators as well as to fundamental accelerator technology. The funding of advanced or fundamental R&D, which is usually high-risk but potentially high-reward, is difficult to obtain for any organization, especially smaller industrial companies. As an example of one funding approach, I discuss the role of industrial companies in the field of accelerators and present several examples from my own experience of advanced R&D performed by industry under the United States Department of Energy Small Business Innovation and Small Business Technology Transfer Research (SBIR-STTR) Grant programs.  
slides icon Slides WEIB06 [6.226 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEIB06  
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WEPMW020 Storage-ring Electron Cooler for Relativistic Ion Beams 2466
 
  • F. Lin, Y.S. Derbenev, D. Douglas, J. Guo, G.A. Krafft, V.S. Morozov, Y. Zhang
    JLab, Newport News, Virginia, USA
  • R.P. Johnson
    Muons, Inc, Illinois, USA
 
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 and DE-AC02-06CH11357
Application of electron cooling at ion energies above a few GeV has been limited due to reduction of electron cooling efficiency with energy and difficulty in producing and accelerating a high-current high-quality electron beam. A high-current storage-ring electron cooler offers a solution to both of these problems by maintaining high cooling beam quality through naturally-occurring synchrotron radiation damping of the electron beam. However, the range of ion energies where storage-ring electron cooling can be used has been limited by low electron beam damping rates at low ion energies and high equilibrium electron energy spread at high ion energies. This paper reports a development of a storage ring based cooler consisting of two sections with significantly different energies: the cooling and damping sections. The electron energy and other parameters in the cooling section are adjusted for optimum cooling of a stored ion beam. The beam parameters in the damping section are adjusted for optimum damping of the electron beam. The necessary energy difference is provided by an energy recovering SRF structure. A prototype linear optics of such storage-ring cooler is presented.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW020  
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WEPOR030 Gas Filled RF Resonator Hadron Beam Monitor for Intense Neutrino Beam Experiments 2733
 
  • K. Yonehara, A.V. Tollestrup, R.M. Zwaska
    Fermilab, Batavia, Illinois, USA
  • R.J. Abrams, R.P. Johnson, G.M. Kazakevich
    Muons, Inc, Illinois, USA
  • H.M. Dinkel
    University of Missouri, Columbia, Columbia, Missouri, USA
  • B.T. Freemire
    IIT, Chicago, Illinois, USA
 
  Funding: Work supported by Fermilab Research Alliance, LLC under Contract No. DE-AC02-07CH11359 and DOE HEP STTR Grant DE-SC0013795.
MW-class beam facilities are being considered all over the world to produce an intense neutrino beam for fundamental particle physics experiments. A radiation-robust beam monitor system is required to diagnose the primary and secondary beam qualities in high-radiation environments. We have proposed a novel gas-filled RF-resonator hadron beam monitor in which charged particles passing through the resonator produce ionized plasma that changes the permittivity of the gas. The sensitivity of the monitor has been evaluated in numerical simulation. A signal manipulation algorithm has been designed. A prototype system will be constructed and tested by using a proton beam at the MuCool Test Area at Fermilab.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOR030  
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THPMR052 Compact, Microtron-Based Gamma Source 3522
 
  • R.J. Abrams, M.A.C. Cummings, R.P. Johnson, S.A. Kahn, G.M. Kazakevich
    Muons, Inc, Illinois, USA
 
  Funding: This work was supported U.S. DOE SBIR Grant DE-SC0013795.
The conceptual design of a prototype S-band pulsed, 9.5 MeV compact microtron with type-II injection is described. Estimates of parameters such as beam current and cathode lifetime, and comparisons with X-band and C-band parameters are presented. The electron beam can be extracted at various energies up to 9.5 MeV. Estimated yields of gammas produced at 6.5 MeV operation and estimated yields of gammas and neutrons produced at 9.5 MeV are presented.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMR052  
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