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It is entirely misleading to think of a grid current as being formed by the electrons collected by that grid, because a charge within a gapinduces acharge onthegrid in an amount that increases asit draws nearer to the grid. Asitmoves about inthegap theamount of induced charge changes; the rate of change is the current flowing to or from the grid. Iftheelectron hits the~id, thecurrent stops ;ifit passes through the grid, a charge is induced on the opposite side of the &d, the rate of change of which depends on the motion in the region where it now finds itself; the current to the grid reverses on passing through the grid.

In its effect on the momentum of the electrons, the r-f gap field produces velocity modulation and, in modulating the time of passage of the electrons, it bunches the electrons and in this manner produces density modulation. In a gap the sources of modulation are two-fold: (1) that present in the beam on entering the gap, and (2) that produced by the gap field. The density modulation results from (1) density modulation at injection, (2) velocity modulation at injection generating density modulation through drift action, and (3) modulation of the time of passage by the gap field producing density modulation.

Early in the development of pulse radar there was some development in Britain of two-resonator klystron oscillators as fixed-tuned pulsed Efficiencies of 20 per cent and peak output powers of tens transmitters. of kilowatts were obtained at 12 kv and 3000 MC/see; but further develTypical opment was overshadowed by pulse magnetron development. c-w operation at lower voltages is provided by the type 41OR, a generalpurpose tube which has external feedback and hence may be used also as$%n amplifier.

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Dynamic Response of a [nuclear] Weapon's Internal Components to High-Speed Impact


by William
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