Beam-instabilities and their impact on anomalous neutron reactivity

Field Reversed Configuration (FRC) toroidal current is sustained with the neutral beam injection (NBI). ~ ~Thermal plasma is deuterium and beams are hydrogen. ~If there exists some beam driven modes that can make clumpy distribution in its phase space of the beam-plasma system, the plasma bulk portion of the clumpiness can contribute to enhance the fusion reactivity (Anomalous increase of neutrons originating from thermonuclear D$+$D reaction is observed signaling rise of thermal ions temperature. It is useful to~study a beam heating of the thermal ions via a beam-driven instability). ~Thus it is of crucial interest if and what kind of beam-driven instabilities are available for the C-2 experimental conditions under which this anomalous neutron yield is observed (see accompanying abstract). ~As a starter, the hot plasma electrostatic dispersion relation with the ion beam is~investigated as to determine possible growth rate and heating associated with the beam.~