Development of the klystron modulator using a highvoltage. It is very stable and contains the short circuit protection circuit. As a result, the power supply can operate at constant current and power and thus. Reflex klystron consists of an electron gun, a cathode filament, an anode cavity, and an electrode at the cathode potential. Peak power levels of megawatts, average power in kilowatts efficiency of greater than 50% possible allows rf energy to pass through the tube unaffected when not pulsed requires added stages of amplification because of low gain, e. It consists of klystron power supply, klystron mount tube, isolator, variable attenuator, frequency meter, slotted line section, vswr meter and load. The modulator is the dc power supply for the klystron. Modulator charging power supply design requirements 35 3.
The protection of the klystron against selfarcs is extremely important for the power supply. A brief introduction to rf power sources 1 introduction 2 klystrons. A solidstate switching stage is coupled between the dc power. Vogel, desy, hamburg, germany abstract the power supply system for klystron cathode heater, based on the highvoltage gap transformer, has been. To study the characteristics of the reflex klystron tube and to determine its electronic tuning range.
Pdf operation of crowbarless power supply for klystron. Telemark st series power supply instruction manual 10 4 installation introduction the st electron beam source power supply is designed to be mounted in a standard 19inch electronic instrument rack. 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. Led digital meter for beam voltage, current and repeller voltage. The efficiency of klystron results from the ratio of the power supplied to the klystron as a dcpower supply and the highfrequency power output. Ess klystron modulator requirements specification voltage 115 kv.
Also, the tetrode does not require a focusing magnet system. The power supply load is protected from overvoltage by the crowbar circuit, which triggers at 16. A klystron is characterized by high power, large size, high stability, high gain, and high operating voltages. 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. The efficiency of a twocavity klystron is about 40%. The reflex klystron makes use of velocity modulation to transform a continuous electron beam into. Klystron power supply, model kp151, is a stateoftheart solid state, regulated power supply for operating low power klystrons such as 2k25, 723 ab, rk 5976, 726, 2k22 etc. Klystron power supply, klystron with mount, isolator, frequency meter. Klystron microwave test bench gunn microwave test bench. The klystron amplifier is capable of some of the highest power levels used in radar many hundreds of kilowatts of average power. The unique characteristics of the light trigged thyristor make it ideal for the crowbar application. A line type modulator for modulating an rf power device in a medical linear accelerator is described. All klystron filaments are powered by ac power suppliers through isolated transformers. The pulse generator driving this klystron has maximum peak power rating of 14.
The klystron is used in television transmission, particle accelerators, and powerful radar, like that in the dew line which defended north america from attack. Waveguide components klystron power supply manufacturer. 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. Pdf a new crowbarless power supply was installed at newsubaru and has been operated with no serious problem since 1998. Using a hipot high voltage 10kv, low current power supply. Periodic klystron maintenance if satcom klystrons are to be stored for extended periods, it is recommended that they be periodically checked for vacuum integrity. 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. 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. Regulated beam supply, repeller and filament supply voltages.
The power supply system for klystron cathode heater, based on the highvoltage gap transformer, has been developed to transfer 800 watts up to kv. The disadvantages of the klystron are that it is usually large and it requires high voltages e. Vogel, desy, hamburg, germany abstract the power supply system for klystron cathode heater. Klystron power supply generates voltage required for driving the reflex klystron tube like 2k 25 a source of microwave energy. Coherent synchrotron oscillation excited by a ripple of a.
Modelbased klystron linearization in the swissfel test facility. These high power rf klystrons employed as rf amplifier in turn derive this energy from high voltage pulsed dc power supply commonly called. Oct 24, 2018 this paper deals with a highvoltage pulse power supply for a 1. The klystron power supply also provides all the other d. Any suitable place on a vacuum system that has a standard 19inchwide opening may be used. Chung pohang accelerator laboratory abstract the existing klystron modulator in the linac use a 60.
Citeseerx document details isaac councill, lee giles, pradeep teregowda. Expt 2 klystron power supply free download as word doc. Reflex klystron is one of the most commonly used microwave low power generators. The modulator employs a low voltage dc power source and a flyback transformer. Pdf design of pulse power supply for klystron and its. 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. Klystron cathode heater power supply system based on the. The new power supply can provide a dc high voltage of up to 45 kv. Expt 2 klystron power supply power supply electricity scribd. It was not recommended by the ro to replace the klystron at that time. A filament is a critical component of the klystron used to heat the cathode. The cpi power supply design and high efficiency, multistage depressed collector klystron make these lower temperatures possible.
A highpower switching inverter unit eliminates the. Although the unique design of the power supplies limits the fault current under klystron fault a light triggered thyristor crowbar is also incorporated. The anode power supply is much lower in voltage than the collector potential of a klystron or iotbased system 8 kv is common. Microwave engineering reflex klystron tutorialspoint. Pdf design of pulse power supply for klystron and its noise.
Pdf a new crowbarless power supply is to be installed at the new subaru storage ring. This lead us to investigate ppm or more accurately pcm focused klystrons. The klystron is the ubiquitous source of rf power in accelerators today. A simple regulated power supply for characteristics. A switching mode power supply smps is a hopeful candidate for the 1mw cw klystron power supply of komac korea multipurpose accelerator complex. Klystron cathode heater power supply system based on the high. Klystron 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. The merits of the smps are low stored energy, small size, high rating efficiency and possible cost saving whereas the demerits are emi problem and system complexities. The hva system, which keeps the radar cool, had issues this summer due to the hot temperatures at the radar site. As for ec, the development issues for the klystron relate mainly to the cooling of the structure. It has built in facility of square wave and saw tooth generators, for amplitude and frequency modulation. Physics motivations for the international linear collider 1. Klystron power supply generates required beam and repeller voltage for the xband klystron tube like 2k25. In order to achieve better klystron preheat, a klystron filament power supply control system is.
This microwave generator, is a klystron that works on reflections and oscillations in a single cavity, which has a variable frequency. Design of the klystron filament power supply control. The rf source is a klystron amplifier see section 17. Klystron tube technologies for very high power applications, such as synchrotrons and radar systems, have since been developed. Klystron power supply for the klystron based microwave bench. Simila in operation to power supplies voltage sources the student is already acquainted with, it is.
Current sensing circuitry senses current in the primary winding of the flyback transformer and generates a current sense signal indicative thereof. Ess klystron modulator requirements specification voltage 115 kv current 25 a per klystron pulse width 3. 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. This paper deals with a highvoltage pulse power supply for a 1. How a linacs properties interact with the power source. 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. And using auxiliary system called drc droop compensator can improved pulse flatness. Klystron test lab 10 high power pulsed modulators and two high power cw test stands. And using auxiliary system called drc droop compensator can improved pulse. Voltages required for operation of reflex klystron tube such as beam, heater and reflector voltage. As klystron filaments work voltage is floating on cathode with tens of thousands kilovolts dc high voltage that is an unsafe factor in case of high voltage leak especially, it is reasonable to isolate the cathode high voltage from filament power supply. The precision pulse power supply can guarantee stable output power and safety of klystron. Gaudreau delivered a klystron power supply kps figure 1 for the isis front end test stand at rutherford appleton laboratory. This goal was achieved by modifying the tetrode modulator, the hv line between modulator and klystron, and the filter network of the hv power supply.
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. Design of the klystron filament power supply control system. Experiment4 study of the characteristics of the klystron tube. Korepanov, budke r inp sb ras, novosibisk, russia v. This certainly didnt help a klystron that had already been showing its age. Klystron switching power supplies for the international linear collider dott. Modelbased klystron linearization in the swissfel test. Klystron and microwave department capabilities and xband klystron overview. Pdf vis102b vks7960a 45ghz, wr430 klystron waveguide circulator arc detector microwave waveguide arc detector high power klystron. Pdf a crowbarless power supply for klystrons researchgate.
The power supply is thyristor regulated and has no crowbar circuit and no large capacitor bank 5. Klystron power supply, klystron tube, isolator, frequency meter, variable attenuator, detector mount, waveguide stand, vswr meter and bnc cable. Klystron power supply, is a stateoftheart solidstate, regulated power supply for operating low power klystrons. E3765,a is an sband high power amplifier klystron designed for industrial linear accelerators. The proposed hardtube type high voltage pulse power supply can produced pulses flattop voltage. The maximum voltage and current of the klystron power supply is 90 kv and 20 a, and the ac power line frequency is 60 hz. Each power supply is a sixphase rectifier circuit with ripple. Nvis 102 klystron power supply is a stateoftheart solidstate, regulated power supply for operating low power klystrons. Polarity offers models suited for all major platforms where size, weight, and performance are critical. Operation of the lep cw klystrons in pulsed mode inspire hep. It is absolutely stable, regulated and short circuit protected power supply. Us5933335a compact solid state klystron power supply. The curves are in good agreement with those plotted using conventional power supplies.
Pdf operation of crowbarless power supply for klystron at. 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. Operation of crowbarless power supply for klystron at newsubaru. Marconi sanders type 6597 klystron power supply marconi instruments ltd c1965 acrobat 7 pdf 2. 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.
Klystron and microwave department capabilities and xband. Model kp151 incorporates a number of proprietary features. Installation and operation of new klystron power supply with fast. Control the modulators have local and remote control modes local control and communication with epics is. January 5, 2011 erik jongewaard kmd and xband overview. Romtek klystron power supply generates voltage required for driving the reflex klystron tubes like 2k25, 2k56, 2k22. Rosary international school, mumbai banglore highway, warje, pune 411052. Thus klystron filament is not feed directly by the power supply but through an isolated. Regulated beam supply and repeller supply voltages led digital meter for beam voltage, current and repeller voltage compact and reliable. A simple regulated power supply for characteristics studies. Kek, one of the klystron power supplies was upgraded during a summer shutdown in 2003. Klystron switching power supplies for the international. Greater reliability low temperatures are the key to longer lifetimes for klystrons and electronic parts.
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