Abstract: A neutral beamline employing direct energy recovery of unneutralized residual ions is provided which enhances the energy recovery of the full energy ion component of the beam exiting the neutralizer cell, and thus improves the overall neutral beamline efficiency. The unneutralized full energy ions exiting the neutralizer are deflected from the beam path and the electrons in the cell are blocked by a magnetic field applied transverse to the beam direction in the neutral izer exit region. The ions which are generated at essentially ground potential and accelerated through the neutralizer cell by a negative acceleration voltage are collected at ground potential. A neutralizer cell exit end region is provided which allows the magnetic and electric fields acting on the exiting ions to be loosely coupled.

Abstract: A duopigatron ion source is modified by replacing the normal oxide-coated wire filament cathode of the ion source with a hot tungsten oven through which hydrogen gas is fed into the arc chamber. The hydrogen gas is predissociated in the hot oven prior to the arc discharge, and the recombination rate is minimized by hot walls inside of the arc chamber. With the use of the above modifications, the atomic H.sub.1.sup.+ ion fraction output can be increased from the normal 50% to greater than 70% with a corresponding decrease in the H.sub.2.sup.+ and H.sub.3.sup.+ molecular ion fraction outputs from the ion source.

Abstract: A target for a fusion neutron generator consisting of planar arrays of parallel tubes through which a cooling liquid is circulated. The target is relatively thin, and can be used to intercept two ion beams simultaneously, one on the front and the other on the back of the target. Two mixed ion beams, each containing a mixture of deuterium and tritium ions are accelerated into both sides of the water-cooled chromium plated copper-tube target whereby reactions occur yielding 14 MeV neutrons. At typical operating conditions of 170 keV and 300 mA total beam current, the neutron yield with a mixture of deuterium and tritium gas is approximately 6 .times. 10.sup.12 n/sec for an effective beam spot of 5.5 centimeters diameter.