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Topic: Magnetron

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Klystron

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	Power supply means for magnetron - Patent 4005370
		Magnetron power supply means as claimed in claim 2, wherein said signal generating means comprises a bridge circuit having a transistor therein for producing a signal corresponding to power input applied to said magnetron.
		Magnetron power supply means as claimed in claim 2, wherein said signal generating means comprises photocoupler connected to said secondary side of said step-up transformer connected to said secondary side of said step-up transformer for producing a signal corresponding to the power input to said magnetron.
		3 and a magnetron 33 corresponding to the magnetron 19 of FIG.
	www.freepatentsonline.com /4005370.html (2821 words)

	magnetron - HighBeam Encyclopedia
		magnetron, vacuum tube oscillator (see electron tube) that generates high-power electromagnetic signals in the microwave frequency range.
		The magnetron is noted for its high efficiency (ability to convert electrical power input to microwave power output).
		Magnetrons are available for generating microwave energies ranging from a few kilowatts to a few megawatts and are used extensively in radar systems and microwave ovens.
	www.encyclopedia.com /doc/1E1-magnetro.html (323 words)

	Magnetron Operation
		The microwave radiation of microwave ovens and some radar applications is produced by a device called a magnetron.
		The magnetron is called a "crossed-field" device in the industry because both magnetic and electric fields are employed in its operation, and they are produced in perpendicular directions so that they cross.
		As these electrons sweep toward a point where there is excess negative charge, that charge tends to be pushed back around the cavity, imparting energy to the oscillation at the natural frequency of the cavity.
	hyperphysics.phy-astr.gsu.edu /hbase/waves/magnetron.html (234 words)

	The Secret Journals of Phineas J. Magnetron
		Magnetron attended university in London for a brief time, but was soon dispirited by the institutionalized adherence to conventional thought he found within their halls.
		Magnetron was an inveterate drinker of Kentucky bourbon, but maintained an abiding passion for ales and lagers of all types.
		Magnetron considered himself to be practical, if eccentric, and usually stubbornly resisted being drawn into the Society's exploits, mercilessly deriding the others' "folly and imprudence." But this was most likely for his own amusement, as he seemed to harbor a secret need for the thrill of death-defying undertakings.
	home.earthlink.net /~pjmagnetron/magnetron.htm (1325 words)

	Magnetron sputtering apparatus and process (Site not responding. Last check: 2007-10-09)
		When baffled magnetron cathodes 30 are used both to sputter and to oxidize, the cathodes are operated at relatively high power density in an oxygen ambient within chamber 10 using a target designed for sputtering the selected metal such as silicon or tantalum.
		However, the baffle-separated magnetron cathodes which are used at stations 26 and 27 for metal deposition are operated in a low reactive gas (oxygen) partial pressure environment for operating in a metal mode and depositing metal at consequentially high rates.
		To initiate coating, the shutter covering the aperture of magnetron 102 is opened and the substrate at 96 is transported at a constant velocity in the direction 99 past the processing stations to position 97, then is returned in the opposite direction 100 to position 96.
	www.stickebana.com /scitech/magnetron_sputtering_process.html (8758 words)

	The magnetron
		The MAGNETRON, shown in figure 2-17, view (A), is a self-contained microwave oscillator that operates differently from the linear-beam tubes, such as the twt and the klystron.
		When the magnetron is adjusted to the cutoff, or critical value of the plate current, and the electrons just fail to reach the plate in their circular motion, it can produce oscillations at microwave frequencies.
		A negative-resistance magnetron oscillator is operated by a static negative resistance between its electrodes.
	www.tpub.com /neets/book11/45f.htm (1428 words)

	CPI / BMD Products Including Receiver Protectors, Switches, Pressure Windows, Magnetrons, Traveling Wave Tubes, Crossed ...
		In a magnetron, the source of electrons is a heated cathode located on the axis of an anode structure containing a number of microwave resonators.
		The distinguishing feature of the coaxial magnetron is the presence of a high Q stabilizing cavity between the anode and the output waveguide.
		When estimating magnetron frequency change due to temperature coefficient, keep in mind that the temperature coefficient relates magnetron frequency to body temperature and there is not necessarily a 1:1 relation between body temperature and, for example, ambient air temperature.
	www.cpii.com /bmd/mag1.htm (3154 words)

	The Magnetron Tube:Structure and Operation
		The magnetron is a diode-type electron tube which is used to produce the required 2450 MHz of microwave energy.
		The antenna is coupled to the waveguide, a hollow metal enclosure, into which the antenna transmits the RF energy.
		The theory of magnetron operation is based on the motion of electrons under the combined influence of electric and magnetic fields.
	www.upv.es /gcm/docente/magnetron.html (1149 words)

	Radars - Developments During World War II - Cavity Magnetron
		The cavity magnetron was so promising that Oliphant's group abandoned their work on the klystron to work with the new device.
		Immediate applications of the cavity magnetron were used in ships and aircrafts and could detect submarine periscopes 6 miles away.
		The operation of the magnetron is based on the combined effect of electric and magnetic fields on an electron.
	www.ee.ic.ac.uk /eee2proj/gsb04/DuringWWII_Cavity_Magnetron.htm (836 words)

	Private Limited Company «Ferri Vatt» - Information
		Magnetrons are powered from the pulse dual block with a frequency of 20-70 kHz and every the half-period one magnetron is the cathode (it is sputtered) and another is the anode.
		It is very important that magnetron is not constant load and works as a stabilitron.
		Thus, the arc phenomena are excluded that enables, first, to increase the density of current on a target (it is especially important for lengthy magnetrons) and to improve arc burning conditions at reactive sputtering, secondly, to increase the quality of coating (for details see section “defects”).
	www.magnetron.ru /eng/info/obr.htm (1997 words)

	What is a Magnetron?
		Typically used in microwave ovens, a magnetron is a tube that utilizes electrical and magnetic currents in order to create an intense heat output.
		The electromagnetic energy created from a magnetron can travel at the speed of light and is the same type of energy used in radio and television broadcasting.
		A magnetron tube has a filament in the center which heats up when it is exposed to a slight amount of voltage or energy.
	www.wisegeek.com /what-is-a-magnetron.htm (455 words)

	Technologies on Magnetron Sputtering
		Magnetron sputtering is the most widely used method for vacuum thin film deposition.
		Although the basic diode sputtering method (without magnetron or magnetic enhanced) is still used in some application areas, magnetron sputtering now serves over 90% of the market for sputter deposition.
		The GENCOA range of magnetron sputtering sources have been developed to ensure the highest level of performance in whichever vacuum deposition application you are involved.
	www.gencoa.com /tech/index.html (515 words)

	Frequency agile magnetron imaging radar (US4538149)
		A system is disclosed for utilizing frequency agile magnetron radars to porm one, two and three dimensional target imaging using coherent frequency agile radar waveforms.
		The pulses from a frequency agile magnetron are controlled so that their frequencies are approximately those of a highly coherent stepped frequency source.
		Means are provided for monitoring the magnetron's tuning piston position read-out voltage and for triggering the pulse forming network associated with the magnetron at the occurrence of each one of a set at a predetermined read-out voltage levels.
	www.delphion.com /details?pn=US04538149__ (278 words)

	CW Microwave - 2450 MHz Power Supplies
		In addition to powering magnetron, CM 340 generator also supplies power to magnetron cooling fan, it monitors magnetron temperature, carries out a number of monitoring processes independently, cuts off the power in case of malfunction and displays the alarms by means of LED.
		The high voltage output of the module is applied to the cathode of the magnetron, and the magnetron output power is controlled by the anode current.
		The PM450E pulsed power supply unit is suitable to drive a 1,250 W magnetron, like the 2M137 or similar, and it has the capability to work as a continuous or as a pulsed power supply unit.
	industrial.rell.com /ipgcw_2450powersupplies.asp (1604 words)

	The educational encyclopedia, physics, all about magnetron, microwave ovens
		Magnetron the magnetron is a self-contained microwave oscillator (f = 2.44 GHz - 2.45 GHz) that operates differently from the linear-beam tubes, such as the twt and the klystron.
		Magnetron The microwave radiation of microwave ovens and some radar applications is produced by a device called a magnetron,...
		Split-anode magnetron the split-anode, negative-resistance magnetron is a variation of the basic magnetron which operates at a higher frequency.
	www.educypedia.be /education/microwaveoven.htm (687 words)

	Electrically controllable magnetron power supply - Patent 4672159
		In a power-line-operated electronic inverter-type power supply for the magnetron in a microwave oven, the unfiltered pulsed DC output of a full-wave rectifier is applied to a bridge inverter, the output of which is a 30 kHz squarewave voltage pulse-amplitude-modulated at 120 Hz.
		Hence, the instantaneous absolute magnitude of the direct current provided to the anode of the magnetron is proportional to that of the unfiltered low-magnitude DC voltage supplied to the inverter; which, in turn, implies that the instantaneous magnitude of the current drawn from the power line is proportional to that of the power line voltage.
		However, during the brief period before the magnetron's cathode reaches a point of substantial thermionic emission, voltage limiting is provided by Varistor V. The voltage present across C and therefore across terminals CT1 and CT2, is provided to a voltage-doubling rectifier/filter means consisting of Ra, Rb, Ca and Cb.
	www.freepatentsonline.com /4672159.html (3091 words)

	Split-anode magnetron
		Since a very concentrated magnetic field is required for the negative-resistance magnetron oscillator, the length of the tube plate is limited to a few centimeters to keep the magnet at reasonable dimensions.
		The output of a magnetron is reduced by the bombardment of the filament by electrons which travel in loops, shown in figure 2-22, views (B) and (C).
		The average power of the electron-resonance magnetron is limited by the amount of cathode emission, and the peak power is limited by the maximum voltage rating of the tube components.
	www.tpub.com /neets/book11/45g.htm (765 words)

	Dexter Magnetic Technologies-Z-Gun™ Magnetron Sputter Source
		Our newly developed Rotating Magnetron Guns (Z-Guns™) have been specifically engineered for the demanding requirements of data storage media producers.
		Rotational speed, phase shifting between coincident magnetron pairs, and z-position can be programmed for specific targets and processes.
		Magnetron synchronization is another feature that can be programmed by the user.
	www.dextermag.com /Z-Gun.aspx (463 words)

	Magnetron
		Thus, if the filament current is made alternating the plate current will flow every time the filament is zero.
		6, represents a converter system comprising two magnetron tubes, one transformer with a central tap in the high tension winding and a generator of special design supplying a filament current of constant value but regularly interrupted.
		Furthermore the life of a magnetron is 60,000 hours, that is about seven years of continuous operation.
	webpages.charter.net /tesla/magnetron.htm (1366 words)

	Tegal Awarded Key Patent For New Magnetron Sputter Source
		The new Flat Magnetron's magnetic design and the physical placement of the sputter cathode in the magnetic field enables a significant improvement in material utilization.
		The first Flat Magnetrons are in daily use at the Nanofabrication Center of the University of California at Santa Barbara, where they are installed in a Sputtered Films Endeavor AT PVD cluster system.
		The Flat Magnetron was the final invention of Peter Clarke, founder of Sputtered Films, prior to his passing in 2002.
	www.physorg.com /news2455.html (482 words)

	Magnetron Text - Physics Forums Library
		I just started using a magnetron for sputter deposition in a project for a prof, and after reading about it, it seems to be the same.
		The term is used because the set-up is similar to a magnetron.
		So, since the secondary electrons are a good thing to have around for as long as possible, a permanent magnet is used (and hence the name 'magnetron sputtering') to make the path of the electrons a spiral (rather than a straight line).
	www.physicsforums.com /archive/index.php/t-89794.html (297 words)

	Magnetron Engineering - Welcome
		The people of Magnetron are dedicated in providing the highest quality electronic communications products for police, fire, and public safety.
		Magnetron is comprised of engineers and technicians skilled in design, production, and installation of customized communications equipment made to fit the exacting needs of our customers.
		Our staffs are committed to the assurance of your satisfaction, and appreciate the feedback from our customers for continuous improvement of all products.
	www.magnetroninc.com (150 words)

	How To Test The Magnetron Used In Microwave Ovens
		It is much like a radio transmitter in that it produces RF energy and radiates the energy into the cooking cavity where it is absorbed by the food.
		The magnetron uses permanent magnets and a half-wave voltage doubler circuit (the HV capacitor and HV diode) to oscillate and produce the 2450 Mhz cooking frequency, thus converting the 60 Hz supply voltage into microwave energy.
		Examine the rim of the opening where the magnetron dome is to be inserted into the waveguide.
	www.gallawa.com /microtech/mag_test.html (626 words)

	How Magnetron Works (Site not responding. Last check: 2007-10-09)
		The heart of a microwave oven is the magnetron.
		A magnetron converts electrical energy to microwave radiation.
		As they pass by resonating cavities, they generate a continuous pulsating magnetic field, or electromagnetic radiation.
	home.cvc.org /microwaves/34_HowMagnetronWorks.html (114 words)

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