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A reflex klystron consists of an electron gun, a cavity with a pair of grids and a repeller plate as shown in the above 52ria120. To understand the operation of a reflex klystron I think you need to start with a basic understanding of a tuned circuit made up from a capacitor. The energy of the electron beam amplifies the signal, and the amplified signal is taken from a cavity at the other end of the tube.
These changes alternately accelerate and decelerate the electrons of the beam passing through the grids. Regardless of how klyztron produce the LC circuit the physics works the same way. For very high frequencies where the skin effect dominates highly conductive materials such as gold and silver are used for construction.
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The bunches of electrons passing through excite standing waves in the cavity, which has the same resonant frequency as the buncher cavity.
Since the resonant cavity is oscillating, the grid potential is an alternating voltage that causes the electrostatic field between the grids to follow a sine-wave curve as shown in figureview B. At times 4 and 5, reflfx grid field is reversed; the electrons give up energy because their velocity is reduced as they pass through the grids.
Its length is chosen to allow maximum bunching at the resonant frequency, and may be several feet long. The mutual repulsion changes the relative velocity between the electrons in the bunches and causes the bunches to spread out.
The electrons will then return to klysstron grid gap at the instant the electrostatic field is at the correct polarity to cause maximum deceleration of the bunch. The amount of tuning in this manner reflez not large and is normally used for frequency modulation when transmitting.
Please help improve this article by adding citations to reliable sources. Microwave Engineering — Reflex Klystron Advertisements. When this happens, the electron is forced by the repeller voltage to stop, reverse direction, and return toward the grid. In wikipedia it says that. Thus, the returning electrons supply the regenerative feedback required to maintain cavity oscillations. The magnetron in your microwave cooker used to produce the microwaves and the resonant cavity they cook in and of course the LNB of your satellite system that clever little bit that collects the signal reflected from the dish.
The anode cavity accelerates the electrons while going and gains their energy by retarding them during the return journey. In the middle of these cavities, there is a grid allowing the electrons to pass.
When the grid field provides maximum deceleration, the returning electrons release maximum klyetron to the grid field which is in phase with cavity current.
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datashdet The long drift time in the higher modes allows more time for this electron interaction and, as a result, the effects of debunching are more severe.
It provides low power and has low efficiency. Journal of Applied Physics. The formation of electron kklystron takes place in the drift space between the reflector and the cavity.
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Beyond the buncher grids is a space called the drift space. The electron beam is modulated klhstron it was in the other types of klystrons by passing it through an oscillating resonant cavity, but here the similarity ends. This travel time is called as transit timewhich should have an optimum klystrkn. The location is determined by datasneet transit time of the bunches at the natural resonant frequency of the cavities the resonant datashest of the catcher cavity is the same as the buncher cavity.
The floating drift tube klystron has a single cylindrical chamber containing an electrically isolated central tube.