Abstract
Thrust vectoring of a 100 julb multiaperture cesium electron bombardment engine through an angle of ±5° by the method of accelerator displacement has been previously reported. The limit of thrust deflection on that engine was determined by the rise in accelerator current as ions struck the displaced accelerator. The effects on the thrust deflection limit of accelerator aperture diameter and shape, accel thickness, electrode spacing, screen electrode geometry, and ion beam focusing voltages are described. Optimization of these results has provided a thrust deflection capability of ±9° in two orthogonal axes with the same 100 yulb engine used before. The stability and lifetime effects of large angle deflections are described, and time response data are presented.
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