Reflex klystron consists of an electron gun, a cathode filament, an anode cavity, and an electrode at the cathode potential. Vogel, desy, hamburg, germany abstract the power supply system for klystron cathode heater, based on the highvoltage gap transformer, has been. The unit is actually composed of three separate supplies, each with separate components, except for a power transformer which is common to all three. Pdf a new crowbarless power supply is to be installed at the new subaru storage ring. Contact verified klystron power supply manufacturers, klystron power supply suppliers, klystron power supply exporters wholesalers, producers, retailers and traders in india. The klystron amplifier is capable of some of the highest power levels used in radar many hundreds of kilowatts of average power.
The klystron power supply skps610 has built in modulation facilities of amplitude and. A 500 kw lband klystron with broad bandwidth for subharmonic bunching in the clic test facility v. Technical specification multibeam sband klystron type bt267. The reflex klystron makes use of velocity modulation to transform a continuous electron beam into. Chung pohang accelerator laboratory abstract the existing klystron modulator in the linac use a 60 hz high voltage power suppl y and adopt traditional lc resonant charging scheme with deqing circuit. Since, however, the average power of the klystron is limited typically by its water cooling capacity, a long klystron pulse is necessarily a lowpower pulse. The klystron was the first significantly powerful source of radio waves in the. Klystron switching power supplies for the international. Lowpower klystrons are used as oscillators in terrestrial microwave relay communications links, while highpower klystrons are used as output tubes in. Why is pulse modulation required in reflex klystron. Because the regulator sinks and sources the same energy during each pulse charge cycle, the regulator itself is nondissipative it uses no net power.
The multi cavity klystron consist of a glass envelope in which there is an electron gun composed of heater and cathode. Klystron solenoid magnets since the early 1960s, alpha magnetics has been manufacturing klystron solenoid magnets for use in communications, radar, microwave research and particle accelerators. The most important microwave tubes at present are the linearbeam tubes o type tabulated in table 901. This moves a short circuit in the waveguide and hence affects the. Gan classf power amplifier for klystron replacement. Experiment4 study of the characteristics of the klystron tube. Klystron multi cavity klystron, reflex klystron, working. The paramount 0type tube is the twocavity klystron, and it is followed by the reflex. Klystron is used to generate high peak power a small accelerator need to transport power to the accelerating structure.
Pdf a crowbarless power supply for klystrons researchgate. Our designs can be found in major electronic warfare ew, electronic countermeasure ecm, radar, communication, and test equipment systems worldwide. The efficiency of a twocavity klystron is about 40%. Low power klystrons are used as oscillators in terrestrial microwave relay. We design and fabricate unique power solutions including sspas, twtas, twt power supplies, power converters, and rf test sets. They are velocitymodulated tubes that are used in radars as amplifiers or oscillators. Technical specification multibeam sband klystron type bt258ab. Klystron test lab 10 high power pulsed modulators and two high power cw test stands. The new power supply will drive the toshiba e3740a klystron in preparation for construction of a system to demonstrate high quality intense chopped beams. The original rf power system at the thomas jefferson national accelerator facility jlab operates at 1497 mhz frequency and consists of 340 klystrons model vkl7811. Development of the klystron modulator using a highvoltage. Klystron switching power supplies for the international linear collider dott.
The circuit my junk box yielded a power transformer with outputs around 600 v centertapped winding at 50 ma, 6. A klystron power system for the isis front end test stand. Klystron and microwave department capabilities and xband klystron overview. Our years of experience have made us one of the leaders in the manufacturing of these magnets. Klystron cathode heater power supply system based on the high. To study the characteristics of the reflex klystron tube and to determine its electronic tuning range.
This is so because it helps in the conversion of direct current power into the microwave power. 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. The klystron power supply is considered to be one of the most common power supplies of all. Never spotknock a klystron unless it is secured inside a closed klystron garage. Klystron tube technologies for very high power applications, such as synchrotrons and radar systems, have since been developed. Performance of the power supply as an application of the power supply, the klystron characteristics 2 studied using this power supply are shown in figure 2. These high power rf klystrons employed as rf amplifier in turn derive this energy from high voltage pulsed dc power supply commonly called. How a linacs properties interact with the power source. The linac modulators are locally and remotely controlled pulse generators that supply highvoltage pulses and other ac and dc voltages and currents required for proper operation of high power pulsed rf amplifiers 2856mhz klystrons.
The 3 phase electric supply now provides sufficient margin for operating the high voltage modulator and pulsed transistor amplifiers at same time. A power supply whose input rectifier circuits operate directly from the ac power line, without transformer isolation. The model klystron power supply skps610 is general purpose laboratory power supply which is specially designed to use for reflex klystron tubes of s to x band frequency range. Periodic klystron maintenance if satcom klystrons are to be stored for extended periods, it is recommended that they be periodically checked for vacuum integrity. Change the meter switch of klystron power supply to beam voltage position and set beam voltage to 300 v by beam voltage control knob. Rosary international school, mumbai banglore highway, warje, pune 411052. Polarity is a global leader in power systems design and manufacturing. This microwave generator, is a klystron that works on reflections and oscillations in a single cavity, which has a variable frequency. Expt 2 klystron power supply free download as word doc. Chung pohang accelerator laboratory abstract the existing klystron modulator in the linac use a 60. 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.
Solid state rf power supply efficiency comparable with klystron but less water cooling is required modular high power 1mw level will be available at 750mhz soon at frequencies above 1 ghz the high power will be available in the next 35 years expensive but relatively easy to run typical table from one of the vendors. The klystron is used in television transmission, particle accelerators, and powerful radar, like that in the dew line which defended north america from attack. Study of the characteristics of the klystron tube objective to study the characteristics of the reflex klystron tube and to determine the its electronic tuning range equipments klystron power supply, klystron with mount, isolator, frequency meter, variable attenuator, xband detector, bnctobnc cable and oscilloscope theory. This lead us to investigate ppm or more accurately pcm focused klystrons. Power module pme dc24v 6es78 4ca010aa0 manual, 042007, a5e0111995202 7 properties 1 1. The supply voltage is fed in by means of the tmp terminal module. It has built in facility of square wave and saw to more. The system includes two 220 kw switching power supplies, a 110 kv solid state hard switch pulse modulator, mod anode and filament power supplies, klystron fault protection, and interfaces to the isis controls. Output impedance of a power supply at any frequency of load change. Progress of the klystron and cavity test stand for the fair. The klystron heater must be off for at least twenty minutes before spotknocking is started one hour for precision current measurements. The modulator consists of a high voltage power supply which is. Using a hipot high voltage 10kv, low current power supply. 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.
Klystron power supply klystron power supply generates voltage required for driving the reflex klystron tube like 2k 25 a source of microwave energy. Nevertheless, singlephase rectifiers are still in use both as low power standalone converters up to some kilowatts and as output stage in switched mode power supplies smps. Introduction the cern requirement is for a microwave amplifier which will provide pulsed microwave power for a subharmonic bunching system in the. Alternate pfn thyratron circuit and end of line clipper considera tions. Dti has delivered a fully solid state klystron power supply for the isis front end test stand to rutherford appleton laboratory in the uk. The disadvantages of the klystron are that it is usually large and it requires high voltages e. Microwave engineering reflex klystron tutorialspoint. Dti s system represents a significant advance in solidstate high power. This power supply provides supply voltages for the klystron used in the rf unit, which is capable of powering up to 10 rf units. It consists of klystron power supply, klystron mount tube, isolator, variable attenuator, frequency meter, slotted line section, vswr meter and load. Klystron efficiency loop for the als storage ring rf. Regulated beam supply and repeller supply voltages. The recent energy crisis in california has led us to investigate the high power rf systems at the advanced light source als in order to decrease the energy consumption and power costs. Keep amplitude knob of fm modulator to maximum position and rotate the reflector voltage anticlockwise to get modes as shown in fig.
Klystron power supply, klystron with mount, isolator, frequency meter, variable. Astron power supply ultimate service repair manuals. Due to dc voltage in the cavity circuit, rf noise is generated in the cavity. After the electron gun there are two focusing electrodes used to keep the electron beam in the center around the glass envelope. A simple proportionalintegrator pi analog loop, which controls the klystron. The anode power supply is much lower in voltage than the collector potential of a klystron or iotbased system 8 kv is common. Linear accelerator linac as well as the klystron magnets, alpha magnetics also. Klystron microwave test bench gunn microwave test bench. Microwave transmitter with klystron microwave receiver microwave receiving dipole microwave power supply 11740. The high frequency used in smps makes the capacitance of the output filter reduced and output stored energy small. The curves are in good agreement with those plotted using conventional power supplies. Klystron and microwave department capabilities and xband. It is reliable power source with very high regulation and low ripple contents.
The rend is the power supply industry has been away from linear brute force and toward switching. The total power was determined by the two conventional klystrons plus some margin and was set to 25 mw. Marconi sanders type 6597 klystron power supply marconi instruments ltd c1965 acrobat 7 pdf 2. The xtk3000c and xtk3000c2 are compact klystron power amplifiers kpas designed for fixed and mobile uplink applications.
Modulator charging power supply design requirements 35 3. Klystron power supply generates voltage required for driving the reflex klystron tube like 2k 25 a source of microwave energy. Shipping is greatly simplified as the rf deck, klystron tube. The klystron was the first embodiment of the velocity modulation principle. Pdf design of pulse power supply for klystron and its noise. Klystron power supply, is a stateoftheart solidstate, regulated power supply for operating low power klystrons. Nvis 102 klystron power supply is a stateoftheart solidstate, regulated power supply for operating low power klystrons. January 5, 2011 erik jongewaard kmd and xband overview. Also, the tetrode does not require a focusing magnet system. Thus, we provided an additional rack containing the klystron filament power supply, the 3 solenoid power.
A digitally controlled current regulated 20 v, 25 a dc power supply employing igbt based chopper is developed as the filament power supply for 1 mw, 352. Load power supply module pm 190 w 120230 vac 6ep334ba00 manual, 0120, a5e31691095aa 7 documentation guide 1 introduction the documentation of the s71500 and et 200mp system families has a modular structure. Rf structures, by contrast, typically are designed for short, highpower pulses. The vkl7811 klystron upgrade proposed by cpi foresees adding a solenoid magnet and its power supply, making the system so large that it will. As a result, the power supply can operate at constant current and constant power and so does not produce flicker, regardless of the switching frequency. Multibeam sband klystron type bt258ab vdbt the company was created for the development and manufacture of precision microwave vacuumelectrontube devices vetd. Shoji, lasti, himeji institute of technology, newsubaruspring8, 6781205 japan abstract a new crowbarless power supply for a klystron was installed at newsubaru and has been operated since 1998. The klystron is mounted directly on the top cover of the modulator. The modulator is the dc power supply for the klystron. A klystron uses the kinetic energy of an electron beam for the amplification of a highfrequency signal. The differing operating voltages of kv for the conventional klystrons. Klystron power supply, klystron tube, isolator, frequency meter, variable attenuator, detector mount, waveguide stand, vswr meter and bnc cable. Regulated beam supply and repeller supply voltages led digital meter for beam voltage, current and repeller voltage compact and reliable. Load power supply module pm 190 w 120230 vac 6ep334ba00.
A highpower switching inverter unit eliminates the. Strictly speaking, the definition applies only for a sinusoidal. At the former setup the auxiliaries were embedded into the modulator. Led digital meter for beam voltage, current and repeller voltage. Expt 2 klystron power supply power supply electricity scribd. A 500 kw lband klystron with broad bandwidth for sub. Korepanov, budke r inp sb ras, novosibisk, russia v.
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