Regulated beam supply and repeller supply voltages. Sep 27, 2017 in this video, i have explained reflex klystron with following points 1. The xtk3000c and xtk3000c2 are compact klystron power amplifiers kpas designed for fixed and mobile uplink applications. After the electron gun there are two focusing electrodes used to keep the electron beam in the center around the glass envelope.
Modelbased klystron linearization in the swissfel test facility. The klystron ved requires a pulsed power supply for controlling the grid and a highvoltage power supply to deliver the high voltage to the collector. Korepanov, budke r inp sb ras, novosibisk, russia v. Design and development of magnetron power source from three. The first was a diode containing gun and a fullscale collector.
Pdf operation of crowbarless power supply for klystron at. How a linacs properties interact with the power source. The klystron is mounted directly on the top cover of the modulator. Klystron power supply, klystron tube, isolator, frequency meter, variable attenuator, detector mount, waveguide stand, vswr meter and bnc cable. It consists of klystron power supply, klystron mount tube, isolator, variable attenuator, frequency meter, slotted line section, vswr meter and load. Performance of a high efficiency high power uhf klystron smc.
Pep klystron performance to date three devices have been built in the development of the pep klystrons. Expt 2 klystron power supply free download as word doc. Change the meter switch of klystron power supply to beam voltage position and set beam voltage to 300v by beam voltage control knob. The klystron was invented at stanford university in 1937 and originally used as the oscillator in radar receivers during world war ii. Design of pulse power supply for klystron and its noise characterization.
The anode power supply is much lower in voltage than the collector potential of a klystron or iotbased system 8 kv is common. These high power rf klystrons employed as rf amplifier in turn derive this energy from high voltage pulsed dc power. Periodic klystron maintenance if satcom klystrons are to be stored for extended periods, it is recommended that they be periodically checked for vacuum integrity. Gaudreau delivered a klystron power supply kps figure 1 for the isis front end test stand at rutherford appleton laboratory. The power supply load is protected from overvoltage by the crowbar circuit, which triggers at 16. Astron ss series switching power supplies ss30m free.
Shipping is greatly simplified as the rf deck, klystron tube, and power supply are shipped individually and weigh 100. Aug 19, 2016 a klystron power system for the isis front end test stand a klystron power system for the isis front end test stand m. The modulator employs a low voltage dc power source and a flyback transformer. Typical operational problems with a klystron input drive power is too low and klystron is not saturated although this is required if the tube is included in a feedback loop reduced output power, efficiency, and increased output power amplitude jitter wrong cathode filament current wrong perveance. Switch on the klystron power supply and oscilloscope. A brief introduction to rf power sources 1 introduction 2 klystrons. Marconi sanders type 6597 klystron power supply marconi instruments ltd c1965 acrobat 7 pdf 2.
Keep the timedivision scale of oscilloscope around 100 hz frequency measurement and voltdiv. The power electronics include a 500 kv multiplier power supply, a 10 kv grid modulator, a multiconcentric high voltage cable and an advanced, reentrant interface between the cable and the klystron figure 1. Expt 2 klystron power supply power supply electricity scribd. Astron power supply ultimate service repair manuals schematics on dvd. It is one of the important microwave tubes mainly used for wide bandwidth, high gain, low noise and moderate peak and average power requirement. Klystron power supply generates voltage required for driving the reflex klystron tube like 2k 25 a source of microwave energy.
Klystron microwave test bench gunn microwave test bench. Klystron power supply, is a stateoftheart solidstate, regulated power supply for operating low power klystrons. The efficiency of klystron results from the ratio of the power supplied to the klystron as a dc power supply and the highfrequency power output. The high voltage power supply setting and the input amplitude to the klystron are automatically determined according to the desired output power and the prede ned headroom to. Let us understand twt and klystron basics before we look into comparison between the two. Using a hipot high voltage 10kv, low current power supply. Klystron power supply klystron power supply generates voltage required for driving the reflex klystron tube like 2k 25 a source of microwave energy. Klystron cathode heater power supply system based on the high. Why is pulse modulation required in reflex klystron. Pdf a new crowbarless power supply was installed at newsubaru and has been operated with no serious problem since 1998.
Free from environmental influences such as moisture or. Klystron article about klystron by the free dictionary. In this free space design, the waveguide cell is thus replaced with a relatively large volume glass cylindrical enclosure fitted at its ends. The klystron power supply skps610 has built in modulation facilities of. Jan 16, 2017 a klystron is a specialized linearbeam vacuum tube, invented in 1937 by american electrical engineers russell and sigurd varian, which is used as an amplifier for high radio frequencies, from uhf up into the microwave range. Us5933335a compact solid state klystron power supply. Klystron and microwave department capabilities and xband. Vks8262 series of klystrons for use in particle accelerators for scientific, medical, and industrial applications. In this video, i have explained reflex klystron with following points 1. A 500 kv power system for a gridded sheetbeam klystron. The klystron is the ubiquitous source of rf power in accelerators today. Solid state modulator for klystrongyrotron conditioning, testing, and operation july 2000 power modulator symposium, 1994.
Led digital meter for beam voltage, current and repeller voltage. The multi cavity klystron consist of a glass envelope in which there is an electron gun composed of heater and cathode. The klystron is used in television transmission, particle accelerators, and powerful radar, like that in the dew line which defended north america from attack. A line type modulator for modulating an rf power device in a medical linear accelerator is described. This moves a short circuit in the waveguide and hence affects the. Electrons in a klystron are accelerated to a controlled speed by the application of several hundred volts. Astron corporation ss series switching power supplies are highly regulated and designed for moderate to high power applications. This page on twt vs klystron describes difference between twt and klystron. Klystron switching power supplies for the international. The reflex klystron makes use of velocity modulation to transform a continuous electron beam into. Ess klystron modulator requirements specification voltage 115 kv current 25 a per klystron pulse width 3. Pdf design of pulse power supply for klystron and its noise. To study the characteristics of the reflex klystron tube and to determine its electronic tuning range.
The efficiency of a twocavity klystron is about 40%. I want to know the use of amplitude modulation used in klystron power supply, and how a microwave frequency signal can. Operation of crowbarless power supply for klystron at newsubaru. It has built in facility of square wave and saw to more. Apr 29, 2012 the klystron is used in television transmission, particle accelerators, and powerful radar, like that in the dew line which defended north america from attack.
Vogel, desy, hamburg, germany abstract the power supply system for klystron cathode heater, based on the highvoltage gap transformer, has been. The klystron amplifier is capable of some of the highest power levels used in radar many hundreds of kilowatts of average power. A klystron is a specialized linearbeam vacuum tube, invented in 1937 by american electrical engineers russell and sigurd varian, which is used as an amplifier for high radio frequencies, from uhf up into the microwave range. The modulator is the dc power supply for the klystron. Astron power supply ultimate service repair manuals. While all of them make excellent general purpose power supplies, many of the ss series supplies are designated to work with, and provide enclosures for, specific land mobile radios find astron ss series switching power supplies ss30m and get free standard shipping. This lead us to investigate ppm or more accurately pcm focused klystrons. Throughout this paper, the klystron and the upstream rf and llrf subsystems such as the preampli er and the vector modulator are referred to as the drive chain. Current sensing circuitry senses current in the primary winding of the flyback transformer and generates a current sense signal indicative thereof. Gif and pdf files adobe reader x on dvd r free shipping all around the world. A klystron tube makes use of speedcontrolled streams of electrons that pass through a resonating cavity. As for ec, the development issues for the klystron relate mainly to the cooling of the structure. Klystron tube technologies for very high power applications, such as synchrotrons and radar systems, have since been developed.
Klystron tube article about klystron tube by the free. Pressurized air can be used to free the blowers and fans of any dirt accumulation. The disadvantages of the klystron are that it is usually large and it requires high voltages e. Modulator charging power supply design requirements 35 3. Also, the tetrode does not require a focusing magnet system. Simila in operation to power supplies voltage sources. Reflex klystron working, oscillator and applegate diagram. The rf source is a klystron amplifier see section 17.
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