Summary-An analysis and derivation of the noise figure of a tunnel-diode microwave amplifier are presented. The agreement between the measured noise figure and the theoretical results is an indirect check on the existence of full shot noise in germanium tunnel diodes at microwave frequencies. The limiting noise temperature of the amplifier is elIR/2k, and can be approached by using diodes with small (RC) products in which the extreme overcoupling (load mismatch) and high gain can be achieved simultaneously.
A study is made of an electrostatic method of focusing an electron beam in a traveling wave tube in which the beam traverses a slalom-like orbit between the wires of the slow wave structure. The requisite field is produced by a row of equally spaced wires at the same potential placed midway between two parallel plates at another potential.
The equations of motion are solved to find initial conditions for stable orbits. Space charge effects are considered.
A large slalom tester was built to compare experimental and theoretical results. The agreement between the computed and measured current transmitted is surprisingly close. There is also good agreement between the measured and computed beam perveance.
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