Abstract
A design for a grounded grid oscillator operating at a frequency of 100 megacycles per second, and its use for driving the r.f ion source of an accelerator are described. The oscillator uses a single triode valve type TY2-125, and has an r.f. output power in excess of 300 watts with a total power input of only 500 watts. The mechanical design is simplified by the use of a coaxial bifilar feedback coil to carry the heating current to the valve filament. Provision is made for pulsing the output of the oscillator for pulsed beam accelerator experiments. The performance characteristics of the oscillator and necessary modifications to the ion source for increased r.f. power input are discussed. The maximum deuteron beam current of the accelerator has been increased from 0.7 to 1.6 mA by increasing the r.f. power from 75 to 300 watts.
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