velocity modulation การใช้

• This structure provides a helical waveguide, and hence amplification can occur via velocity modulation.
• This causes the electron beam to " bunch up ", known technically as " velocity modulation ".
• First, the klystron uses " velocity modulation " to create bunching; its beam current is constant.
• The lock-in combined with the velocity modulation gave > 99.9 % discrimination between ions and neutrals.
• An electron beam which enters an RF excited cavity with approximately synchronous velocity will receive cumulative velocity modulation at each gap.
• They used velocity modulation in the same way that Owrutsky et al . had, in order to discriminate ions from neutrals.
• After several rejected models, Russell devised a way to use velocity modulation to allow electrons to flow in bunches and to control their speed.
• To reach higher frequencies, new " transit time " ( velocity modulation ) vacuum tubes were developed, in which electrons traveled in " bunches " through the tube.
• 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.
• 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.