Abstract: Pulsed MeV ion beam techniques are broadly applied in time-of-flight experiments for direct measurements of neutron velocities and energies. They are also used to achieve a neutron monochromater by allowing the selection of neutrons having a well defined velocity. The sequence of components needed for creation of sub-nanosecond pulsed MeV ion beam systems usually consist of a suitable DC ion source, a chopper module for production of beam pulses, a klystron buncher for introducing time compression to individual pulses and a final ion-acceleration stage. It is pointed out that the achievable pulse compression is limited by the energy spread within the pulses that are directed into the klystron buncher. Furthermore, that this energy spread may be dominated by the energy spread created within the preceding chopper system.

Abstract: A DC high voltage generator includes an AC power supply, an AC-DC rectifier and means to stabilize the DC high voltage generator against load variations. The stabilizer means uses at least two electro-magnetically coupled resonant circuits, which compensate the load variations at an operating frequency in such a way that the output voltage is essentially constant.

Abstract: A compact ion beam injection apparatus for tandem accelerators wherein the outputs from two independent ion sources, that may be operated continuously, can be selectively chosen and mass analyzed so that the output from any one of the sources can be rapidly selected and efficiently directed to the input point of a tandem accelerator.