This structure provides a helical waveguide, and hence amplification can occur via velocity modulation.
2.
This causes the electron beam to " bunch up ", known technically as " velocity modulation ".
3.
First, the klystron uses " velocity modulation " to create bunching; its beam current is constant.
4.
The lock-in combined with the velocity modulation gave > 99.9 % discrimination between ions and neutrals.
5.
An electron beam which enters an RF excited cavity with approximately synchronous velocity will receive cumulative velocity modulation at each gap.
6.
They used velocity modulation in the same way that Owrutsky et al . had, in order to discriminate ions from neutrals.
7.
After several rejected models, Russell devised a way to use velocity modulation to allow electrons to flow in bunches and to control their speed.
8.
To reach higher frequencies, new " transit time " ( velocity modulation ) vacuum tubes were developed, in which electrons traveled in " bunches " through the tube.
9.
All of these tubes use the same basic " bunching " of electrons to provide the amplification process, and differ largely in what process causes the velocity modulation to occur.
10.
The concept of velocity modulation he used had already been described by A . Arsenjewa Heil and Oskar Heil in 1935, though the Varians were unlikely to have known of the work.
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