Abstract
The charge-reversal sodium target developed for the MIN injector corresponds at the present time to most of the requirements made on such targets for full-scale injectors of negative ions of hydrogen and deuterium. The range of thickness values obtained fully satisfies the experimental requirements and can be expanded, if necessary. The uniformity of the stream profile in space and in the course of time suffices in its present form for the experimental goals, and ways of improving it are clearly visible. This applies also to the vacuum conditions in the target and to the effusion of sodium from the target. A charge of several kilograms of sodium makes it possible to keep the target in operation for 65 h without downtime. The target was disconnected for further design improvements. A target in the form of a continuous ultrasonic stream of great width makes it possible to use in the injector not only charge-reversal properties but also vacuum shutter properties. This may greatly affect the design and the dimensions of such an injector.
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