RESEARCH ON NOISE IN CROSSED-FIELD GUNS.
Final rept. 1 Jul 63-31 Jul 65,
LITTON INDUSTRIES SAN CARLOS CALIF ELECTRON TUBE DIV
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The requirements for a low-noise injected-beam crossed-field amplifier are discussed. For low-noise operation it is necessary to select parameters so that the diocotron gain in both the gun and drift regions is minimum. It is shown that this can be achieved in the gun region by a proper choice of the largest possible value of the cathode current density and minimum possible values of the cathode width in the direction of beam propagation and magnetic field. The other requirements for a low-noise operation, are 1 proper gun design to give laminar flow the short Kino gun seems to be reasonably good for this purpose, 2 elimination andor attenuation of spurious modes, 3 use of a high-interaction impedance delay line and positioning of the beam close to the circuit.
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