The invention belongs to a
neutron source, and particularly relates to a turn-off planar radio-frequency
ion source drive-in target
neutron tube. The
neutron tube is mainly composed of a planar radio-frequency
ion source, a gas storage element, accelerating electrodes, a target and a vacuum
system. The planar radio-frequency
ion source substitutes for a penning source and is composed of a small-recombination-coefficient
quartz discharge cup, a planar
helical antenna clinging to the cup bottom and a
Kovar material leading-out pole sealing the cup rim, a cusped
magnetic field is formed by a plurality of magnets along the
tube diameter of the
discharge cup,
plasma density is increased, and
electron motion is limited while recombination losses of the tube wall are reduced. Radio-frequency power is transmitted to
plasma from the antenna by means of
inductive coupling. A shielding case is added to the outside of the
ion source, influence of the radio-frequency
electric field on other equipment is reduced, saturation adsorption of
deuterium-
tritium gas is realized by the internal gas storage device, and heating release is performed. The proportion of monatomic ions is increased greatly,
utilization rate of reaction gas is increased,
sputtering of a leading-out hole is reduced, and accordingly yield of the neutron tube is increased while service life of the same is prolonged.