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Description
Tokamak-based fusion neutron sources (FNS) can effectively address the fuel problems of nuclear energy and future fusion power plants operation [1]. FNS primary mission is testing technological systems being exposed to intense neutron flux and evaluation of relevant effects in materials and structural components designed for future nuclear reactors, fusion-fission and pure thermonuclear devices. Hybrid facilities based on FNS can provide invaluable experimental data on nuclear waste management, nuclear fuel production and other technologies for future hybrid reactors. Ultimately, a steady state tokamak-based neutron source with intensity level
At present, two major design options of FNS are considered and still a subject for comparison: a conventionally shaped tokamak DEMO-FNS with a moderate aspect ratio (
In theory, NBCD efficiency (
A simple numerical model [6] is used for beam-driven effects analysis in tokamak plasmas. It incorporates the beam detailed structure with account of NB producing technology and the ions tracking in the equilibrium magnetic field. MHD equilibria are reconstructed by the analytic solution of Grad-Shafranov equation [7]; the approach allows the study of plasma shaping effects through configurations of interest - from conventional to spherical tokamaks. NB fast ion distributions and resulting NBCD profiles are obtained by fast ion tracking in magnetic field. For both FNS devices, non-inductive CD is expected to reach the target values. The results prove NBI is a plausible solution for accessing the long pulse plasma operation and control in FNS, if NBI parameters and injection geometry are chosen appropriately.
[1] Shpansky Y.S. and DEMO-FNS Project Team, 2019 Nucl. Fusion 59 076014