What is a reflex klystron definition?
A reflex klystron is an obsolete type in which the electron beam was reflected back along its path by a high potential electrode, used as an oscillator.
What is the importance of multicavity klystron?
This type of klystron is mostly used for the purpose of amplification of microwave length of frequencies. it means that the high requencies can be amplified by multi cavity klystron.
What is principle of reflex klystron?
Reflex Klystron works on the principle of velocity and current modulation. The electron beam is injected from the cathode. The electron beam passes through the accelerating anode. The electron moves in the tube with uniform velocity until it reaches the cavity.
What is klystron and its types?
A klystron includes one or more cavities, which control the electrical field around the axis of the tube. Based on the resonant cavities, klystron amplifiers are classified into two types. Two cavity klystron amplifier. Reflex klystron amplifier.
What is reflex klystron Mcq?
Explanation: Reflex klystron is a single cavity klystron tube that operates as on oscillator by using a reflector electrode after the cavity to provide positive feedback via the electron beam. It can be tuned by mechanically adjusting the cavity size. This is overcome in travelling wave tube (TWT).
What modes are generally used in a reflex klystron?
Ans. 1 ¾ and 2 ¾ are the most commonly used modes in a practical reflex klystron.
What is a klystron radar?
A power amplifier tube used to amplify weak microwave energy (provided by a radio- frequency exciter) to a high power level for a radar transmitter. They are used in many operational radars, for example, NEXRAD (Next Generation Weather Radar) and TDWR (Terminal Doppler Weather Radar). …
What is difference between reflex klystron and magnetron?
It must operate only as oscillator. Magnetron devices are tunable. This means that output frequency can be changed by varying resonant frequency of cavity. There are two ways to tune the magnetron viz….Magnetron.
| Klystron | Magnetron |
|---|---|
| It can be used both as amplifier and oscillator. | It can only be used as oscillator. |
What is meant by Klystron?
Definition of klystron : an electron tube in which bunching of electrons is produced by electric fields and which is used for the generation and amplification of ultrahigh-frequency current.
What is function of Klystron?
klystron, thermionic electron tube that generates or amplifies microwaves by controlling the speed of a stream of electrons.
What makes up the multi cavity of a klystron?
The multi cavity klystron consist of a glass envelope in which there is an electron gun composed of heater and cathode. After the electron gun there are two focusing electrodes used to keep the electron beam in the center around the glass envelope. There are two cavities known as buncher and catcher cavity.
How does a klystron work in a circuit?
Working of Klystron When switch on the circuit, the electrons starts emitting from the cathode. These electrons move at a uniform speed towards the anode until they are attracted by it. Now we apply the R.F input signal to the buncher cavity with the help of loop coupling.
What can a klystron tube be used for?
An evacuated electron-beam tube in which an initial velocity modulation imparted to electrons in the beam results subsequently in density modulation of the beam. A klystron is used either as an amplifier in the microwave region or as an oscillator.
How does velocity modulation occur in a klystron?
In the floating drift klystron, electrons pass successively through the gaps of cavity resonators (see Figure 1). Velocity modulation occurs in the gap of the input resonator, the ultrahigh-frequency field in the gap periodically accelerating (half a cycle) and decelerating (half a cycle).