TITLE

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

AUTHOR(S)
Matsuura, H.; Nakao, Y.
PUB. DATE
April 2009
SOURCE
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p042507
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
38611546

 

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