Klystron vs magnetron-Difference between Klystron and magnetron
This page on Klystron vs magnetron describes difference between Klystron and magnetron. It covers basics of klystron and magnetron and mention difference between them.
A klystron is basically a vacuum tube with input and output structures replaced with resonant cavities known as buncher cavity and catcher cavity. Normally it functions as amplifier. The klystron with internal or external feedback built in its design can function as oscillator.
Klystron characteristics are as follows:
• Frequency of operation: 4 to 200 GHz
• Bandwidth : /+/- 30 MHz for Delta(VR) od +/- 10 Volt
• Power : 1 mW to 2.5 Watt
• Practical efficiency : 10 to 20 %
• Tuning Range: 5 GHz @ 2 Watt , 30 GHz @ 10 mWatt
Magnetron is different compare to normal tube. Here the electron beam is being forced to follow spiral path from cathode to anode by application of external magnetic field. 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. electronic tuning and mechanical tuning.
Electronic tuning is achieved by generating variable reactance with the help of electron beam.
Mechanical tuning is achieved by inserting mechanical devices e.g. rods or rings into the holes of resonator cavities to
change the inductance of resonant circuit.
Magnetron characteristics are as follows:
• Fixed tube magnetron provides 600 Watt CW power @ 2.45GHz
• Peak power : upto 40 MWatt with DC voltage of 50 KV @ 10GHz
• Average power: 800 KWatt
• Duty Cycle: 0.1 %
• Efficiency: 40 to 80 %
|It can be used both as amplifier and oscillator.||It can only be used as oscillator.|
|Application: It is used in TV transmitter, radar and particle accelerators. Here it is used as high power, narrowband stable amplifier.||Application: It is used in microwave ovens, operating at 2.45 GHz. It is also used for RF heating when operating at 900MHz or 2.45GHz.|
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