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Now showing items 33 - 48 of 2012

  • Nuclear Security Applications of Antineutrino Detectors: Current Capabilities and Future Prospects

    BERNSTEIN, A.   BALDWIN, G.   BOYER, B.   GOODMAN, M.   LEARNED, J.   LUND, J.   REYNA, D.   SVOBODA, R.  

    Antineutrinos are electrically neutral, nearly massless fundamental particlesproduced in large numbers in the cores of nuclear reactors and in nuclear explosions. In the half century since their discovery, major advances in the understanding of their properties, and in detector technology, have opened the door to a new discipline - Applied Antineutrino Physics. Because antineutrinos are inextricably linked to the process of nuclear fission, there are many applications of interest in nuclear nonproliferation. This paper presents a comprehensive survey of applied antineutrino physics relevant for nonproliferation, summarizes recent advances in the field, describes the overlap of this nascent discipline with other ongoing fundamental and applied antineutrino research, and charts a course for research and development for future applications. It is intended as a resource for policymakers, researchers, and the wider nuclear nonproliferation community.
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  • Bernstein meets Broadway: collaborative art in a time of war

    Stephenson   Tim  

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  • Damped Bernstein modes in a weakly relativistic pair plasma

    Laing, E. W.   Diver, D. A.  

    Relativistic Bernstein modes are not totally undamped, but have a small, negative definite imaginary frequency component that peaks where the frequency is closest to the rest cyclotron harmonic.
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  • Electron Bernstein waves in a spherical tokamak with a magnetic well

    A D Piliya   A Yu Popov and E N Tregubova  

    Basic features of electron Bernstein waves propagating in the magnetic well inherent to a spherical tokamak magnetic configuration are investigated in a slab model.
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  • Electron Bernstein waves in a spherical tokamak with a magnetic well

    Piliya, A D   Popov, A Yu   Tregubova, E N  

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  • Collective behavior of ion Bernstein waves in a multi-ion-species plasma

    Toida, Mieko   Suzuki, Takamasa   Ohsawa, Yukiharu  

    Collective behavior of ion Bernstein waves propagating perpendicular to an external magnetic field is studied with attention to the effect of multiple-ion species. In a thermal-equilibrium, multi-ion-species plasma, a great number of Bernstein waves are excited near the harmonics of many different ion cyclotron frequencies. The autocorrelation function of the quasimode consisting of these waves is initially damped and is not recovered to its initial value. This is predicted by the theory and is confirmed by numerical calculations and by particle simulations. It is also demonstrated by particle simulations that a perpendicular macroscopic disturbance is damped in a multi-ion-species plasma. The electric-field energy associated with this disturbance is significantly reduced and is transferred to the ions, indicating that the presence of multiple-ion species affects the energy transport
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  • Numerical and theoretical study of Bernstein modes in a magnetized quantum plasma

    Eliasson, Bengt   Shukla, Padma K.  

    A numerical and theoretical study is presented for the propagation of electron Bernstein modes in a magnetized quantum plasma. The dispersion relation for electrostatic waves is derived, using a semiclassical Vlasov model for Fermi-Dirac distributed electrons. The dispersion relation is checked numerically with direct Vlasov simulations, where the wave energy is concentrated to the Bernstein modes as well as to the zero-frequency convective mode. Dispersion relations in the long wavelength limit are derived, including the upper hybrid dispersion relation for a degenerate quantum plasma. (C) 2008 American Institute of Physics. [DOI:10.1063/1.2994723]
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  • Generalized Bernstein‐Kantorovich–type operators on a triangle

    Kajla, Arun  

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  • Bernstein in the urban classroom: a case study

    Barrett   Brian D.  

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  • Bernstein modes in a weakly relativistic electron-positron plasma

    Keston, D. A.   Laing, E. W.   Diver, D. A.  

    The form of the propagating electrostatic Bernstein mode in a relativistic electron-positron plasma is markedly different from that in the classical plasma, once the momentum-dependent cyclotron frequency is accounted for in full inside the integrations. Given that particles in different parts of momentum space "see" a different cyclotron frequency, there is no simple global singularity which reproduces the classical dispersion features.
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  • Electron Bernstein Waves in a Collisionless Magnetoplasma with Cairns Distribution Function

    Malik, M. Usman   Masood, W.   Rehman, Aman-ur   Mirza, Arshad M.   Qamar, Anisa  

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  • Relativistic ray-tracing of electron Bernstein waves in a spherical tokamak reactor

    E Nelson-Melby   R W Harvey   A P Smirnov   A K Ram  

    Electron Bernstein waves (EBW) can propagate between electron cyclotron harmonics in hot, dense plasmas with no high-density cutoff (unlike electron cyclotron waves). ARIES-ST is a spherical tokamak (ST) reactor study. A promising method of heating and driving current in such an ST reactor would be with electron Bernstein waves. These could be mode converted from microwave vacuum modes (X-mode and O-mode) launched from the edge. In this paper, fully relativistic ray-tracing calculations (both damping and propagation) of EBWs in ARIES-ST are presented, using the relativistic dispersion solver R2D2 and the ray-tracing code GENRAY. The ray paths, damping locations, and polarizations are compared with the more commonly used non-relativistic EBW ray-tracing. A range of frequencies are shown for EBWs with small n that could be produced by the X-B mode conversion process, and EBWs with large n 0.6, produced by the O-X-B mode conversion process. With the density and temperature profile chosen for this paper, the greatest depth into the core that could be reached with mode-converted EBWs is a radial location of approximately ρ = 0.4. Although the radial location of the damping in most cases was not significantly different between the relativistic and non-relativistic cases, there are differences in the poloidal locations, as well as in the polarizations of the wave along the ray path, especially in the damping region.
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  • Relativistic ray-tracing of electron Bernstein waves in a spherical tokamak reactor

    Nelson-Melby, E   Harvey, R W   Smirnov, A P   Ram, A K  

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  • Bernstein–Zelevinsky Derivatives: a Hecke Algebra Approach

    Chan, Kei Yuen   Savin, Gordan  

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  • Monitoring the thermal power of nuclear reactors with a prototype cubic meter antineutrino detector

    Bernstein, A.   Bowden, N. S.   Misner, A.   Palmer, T.  

    In this paper, we estimate how quickly and how precisely a reactorpsilas operational status and thermal power can be monitored over hour to month time scales, using the antineutrino rate as measured by a cubic meter scale detector. Our results are obtained from a detector we have deployed and operated at 25 m standoff from a reactor core. This prototype can detect a prompt reactor shutdown within 5 h and monitor relative thermal power to within 7 days. Monitoring of short-term power changes in this way may be useful in the context of International Atomic Energy Agencypsilas reactor safeguards regime or other cooperative monitoring regimes.
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  • Bernstein wave aided laser third harmonic generation in a plasma

    Tyagi, Yachna   Tripathi, Deepak   Kumar, Ashok  

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