SOME EXPERIMENTS WITH NEW TYPES OF CROSSED FIELD ELECTRON GUNS
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
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The properties of short and long types space charge flow crossed- field electron guns were investigated. Both types of guns were intended for use in M-type injected beam micro wave devices in which , ideally, electron beams satisfy the condition of laminar Brillouin in flow. These guns are based upon the space-charge flow solution of the plane magnetron diode. The short gun was based on the exact form this solution, while the long gun resulted from a simple approximation to this solution which was shown to be valid under certain initial conditions at the cathode. Examples of both types of guns were designed and built. In regard to emission characteristic both behaved substantially as predicted by the theory. The short gun produced a beam which was seemingly a good approximation to planar Brillouin flow and more over, a beam relatively free of the characteristic crossed-field instab- ilities. The beam from the long gun, however, was found to be unsta le under certain conditions. This instabilit was probably related to the formation of a potential minimum associated with space- charge limited emission.
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