2-7 Figure 2-4B.—Electron gun with buncher grids. The manner in which the buncher produces bunches of electrons is better understood by considering the motions of individual electrons, as illustrated in figure 2-5A. When the voltage across the grids is negative, as shown in figure 2-5B, electron 1 crossing the gap at that time is slowed. Figure 2-5C shows the potential across the gap at 0 volts; electron 2 is not affected. Electron 3 enters the gap (figure 2-5D) when the voltage across the gap is positive and its velocity is increased. The combined effect is shown in figure 2-5E. All of the electrons in the group have been bunched closer together. Figure 2-5A.—Buncher cavity action. BUNCHER CAVITY. Figure 2-5B.—Buncher cavity action. ELECTRON #1 DECELERATED.
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