Abstract: An electrostatic accelerated-recirculating-ion fusion neutron/proton source is disclosed. The device acts as a compact accelerator-plasma-target fusion neutron/proton source which can emulate a line-type source. The unit comprises an axially elongated hollow vacuum chamber having an inner and outer wall. Reflectors are located at opposite ends of the vacuum chamber so that their centers lie on the axis of the vacuum chamber. A cathode that is 100% transparent to oscillating particles is located within the vacuum chamber between the reflectors, defining a central volume and having the same axis as the vacuum chamber. Anodes that are 100% transparent to oscillating particles are located near opposite ends of the vacuum chamber between the reflectors dishes and the cathode, having axes coincident with the axis of the vacuum chamber. A means is also provided for introducing controlled amounts of reactive gas into the vacuum chamber, and its central volume.