Modification of alpha-particle emission spectrum in beam-injected deuterium-tritium plasmas

Matsuura, H.; Nakao, Y.
April 2009
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p042507
Academic Journal
The alpha (α)-particle and neutron emission spectra in a deuterium-tritium plasma accompanied with neutral-beam-injection (NBI) heating are evaluated in a consistent way by solving the Boltzmann–Fokker–Planck equations for deuteron, triton, and α-particle simultaneously. It is shown that owing to the existence of non-Maxwellian tail component in fuel-ion distribution function due to NBI and/or nuclear elastic scattering, the generation rate of the energetic (≥4 MeV) α-particle increases significantly. When 20 MW intense deuterium beam with 1 MeV beam-injection energy is injected into an 800 m3 plasma (Te=10 keV, ne=6.2×1019 m-3), the enhancement of the fraction of the power carried by α-particles with energy above 4 (3.9) MeV to total α-particle power is almost twice (1.5 times) as much from the value for Gaussian distribution. A verification scenario for the modification of the emission spectrum by using the gamma (γ)-ray-generating 9Be(α,nγ)12C reaction is also presented.


Related Articles

  • The TOFOR Neutron Spectrometer For High-Performance Measurements of D Plasma Fuel Ion Properties. Johnson, M. Gatu; Giacomelli, L.; Hjalmarsson, A.; Weiszflog, M.; Sundén, E. Andersson; Conroy, S.; Ericsson, G.; Hellesen, C.; Källne, J.; Ronchi, E.; Sjöstrand, H.; Gorini, G.; Tardocch, M. // AIP Conference Proceedings;3/12/2008, Vol. 988 Issue 1, p311 

    The impact of scattered neutrons on the total flux reaching the TOFOR spectrometer at JET has been studied to allow for improvement of the data analysis. The scattered neutrons are demonstrated to contribute significantly to the flux. This will have implications for any neutron diagnostic on ITER.

  • Isotopic scaling of confinement in deuterium-tritium plasmas. Scott, S.D.; Zarnstorff, M.C.; Barnes, Cris W.; Bell, R.; Bretz, N.L.; Bush, C.; Chang, Z.; Ernst, D.; Fonck, R.J.; Johnson, L.; Mazzucato, E.; Nazikian, R.; Paul, S.; Schivelli, J.; Synakowski, E.J.; Adler, H.; Bell, M.; Budny, R.; Fredrickson, E. // Physics of Plasmas;Jun95, Vol. 2 Issue 6, p2299 

    Analyzes the global energy confinement and local thermal transport for deuterium and tritium fueled plasmas to quantify their dependence on the average mass of the hydrogenic ions. Radial profiles of the deuterium and tritium densities; Attribution of the entire scatter in the regressed...

  • Trinucleon two-body photo disintegration with Δ-isobar excitation. Yuan, L. P.; Chmielewski, K.; Oelsner, M.; Sauer, P. U.; Adam, J.; Fonseca, A. C. // AIP Conference Proceedings;2001, Vol. 603 Issue 1, p323 

    © 2001 American Institute of Physics.

  • Hybrid and Steady-State Operation on JET and Tore Supra. Bécoulet, A. // AIP Conference Proceedings;2003, Vol. 694 Issue 1, p219 

    Producing fusion energy requires to simultaneously sustain in a tokamak environment fully non inductive regimes at the highest Q-values and a “significant” fusion performance level under MHD-stable conditions, while insuring a satisfactory confinement of the fast alpha particles....

  • Preliminary calculations of expected signal levels of a thin Faraday foil lost alpha particle diagnostic for International Thermonuclear Experimental Reactor. Cecil, F. E.; Darrow, D. S.; Budny, R. V. // Review of Scientific Instruments;Oct2004 Part I & II, Vol. 75 Issue 10, p3569 

    Thin Faraday collectors are being considered as a diagnostic of lost alpha particles on International Thermonuclear Experimental Reactor (ITER). In an effort to evaluate the viability of this diagnostic, we are undertaking a series of calculations of the signal levels (A/cm2) for such devices....

  • Statistics of particle transport in a two-dimensional dusty plasma cluster. Ratynskaia, S.; Knapek, C.; Rypdal, K.; Khrapak, S.; Morfill, G. // Physics of Plasmas;Feb2005, Vol. 12 Issue 2, p022302 

    Statistical analysis is performed on long time series of dust particle trajectories in a two-dimensional dusty plasma cluster. Particle transport is found to be superdiffusive on all time scales until the range of particle displacements approaches the size of the cluster. Analysis of probability...

  • Non-Gaussian properties of global momentum and particle fluxes in a cylindrical laboratory plasma. Nagashima, Yoshihiko; Itoh, Sanae -I.; Inagaki, Shigeru; Arakawa, Hiroyuki; Kasuya, Naohiro; Fujisawa, Akihide; Kamataki, Kunihiro; Yamada, Takuma; Shinohara, Shunjiro; Oldenbürger, Stella; Yagi, Masatoshi; Takase, Yuichi; Diamond, Patrick H.; Itoh, Kimitaka // Physics of Plasmas;Jul2011, Vol. 18 Issue 7, p070701 

    Non-Gaussian statistical properties of the azimuthally averaged momentum and particle fluxes driven by turbulence have been simultaneously observed in inhomogeneous magnetized plasmas for the first time. We identified the stretched Gaussian distribution of the both fluxes and the transition from...

  • Analysis of the Mechanisms for the Scattering of Plasma Particles by Non-Steady-State Fluctuations. Khvesyuk, V.I.; Chirkov, A. Yu. // Technical Physics;Apr2004, Vol. 49 Issue 4, p396 

    Results of a numerical analysis of the interaction between plasma particles and the wave packets of electrostatic fluctuations are presented. The influence of the dynamic parameters of the particles and packets on the particle scattering is studied. It is shown that, in general, the electron...

  • Propagation and head-on collisions of ion-acoustic solitons in a Thomas–Fermi magnetoplasma: Relativistic degeneracy effects. Akbari-Moghanjoughi, M. // Physics of Plasmas;Jul2010, Vol. 17 Issue 7, p072101 

    Small amplitude propagation and quasielastic head-on collision of ion-acoustic solitary waves (IASWs) are investigated in a degenerate Thomas–Fermi electron-positron-ion magnetized plasma using extended Poincaré–Lighthill–Kuo reductive perturbation method for both...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics