. Airborne radar. Airplanes; Guided missiles. 11-2] THE KLYSTRON 591 Focus Electrode Cathode Heater Input Output Cavity Cavity. Collector Electron Beam Fig. 11-16 A Two-Cavity Klystron Amplifier. gridded in Fig. 11-16. If RF power is supplied to this first cavity resonator from an external source of power, an oscillating electromagnetic field will be developed wholly within the cavity resonator. The electromagnetic field developed by the driving signal does not reach the cathode; cathode current is therefore unaffected by the level of drive power. With drive power supplied to the first resonat
. Airborne radar. Airplanes; Guided missiles. 11-2] THE KLYSTRON 591 Focus Electrode Cathode Heater Input Output Cavity Cavity. Collector Electron Beam Fig. 11-16 A Two-Cavity Klystron Amplifier. gridded in Fig. 11-16. If RF power is supplied to this first cavity resonator from an external source of power, an oscillating electromagnetic field will be developed wholly within the cavity resonator. The electromagnetic field developed by the driving signal does not reach the cathode; cathode current is therefore unaffected by the level of drive power. With drive power supplied to the first resonator, an electromagnetic field is developed within the reso- nator as shown in Fig. 11-7. The electric field is largely concentrated across the gap. When the electron beam passes through this gap, the electrons are acted upon by the electric field. Electrons that pass through the gap at the instant when the electric field is in a direction to speed them up are accelerated dur- ing their passage through the gap. A half-cycle later, the field will have reversed in direction and will decelerate the electrons that pass through at that moment. When the electron beam enters the cavity gap, all electrons are traveling at approximately the same velocity. When the beam leaves the cavity gap, some electrons have been speeded up, and others have been slowed down. This action is known as velocity modulation. After the electron beam leaves the first cavity and proceeds down the drift tube (see Fig. 11-16), the electrons that have been speeded up will tend to catch up with and bunch together with the electrons that passed through the gap a half-cycle earlier but were slowed down by the field in the cavity. Clumps or bunches of electrons will form along the beam. A lumpy or bunched electron beam is called density-modulated. A Fourier analysis of a Magneti : Field ^Electric Field ^^®/. 1®/^ ::V- Fig. 11-17 Electromagnetic Field In- side a Re-entrant Cavity Please note that these im
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