The magnet producing a field parallel to the long axis of the device is not shown. A similar magnetron with a different section removed.

The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field.

This is not a problem in uses such as heating, or in some forms of radar where the receiver can be synchronized with an imprecise magnetron frequency.

The magnetron is a self-oscillating device requiring no external elements other than a power supply.

The magnetron is a fairly efficient device.

The magnetron remains in widespread use in roles which require high power, but where precise frequency control is unimportant.

In some applications, for example a marine radar mounted on a recreational vessel, a radar with a magnetron output of 2 to 4 kilowatts is often found mounted very near an area occupied by crew or passengers.

In microwave-excited lighting systems, such as a sulfur lamp, a magnetron provides the microwave field that is passed through a waveguide to the lighting cavity containing the light-emitting substance ( e. g., sulfur, metal halides, etc.

The cavity magnetron was widely used during World War II in microwave radar equipment and is often credited with giving Allied radar a considerable performance advantage over German and Japanese radars, thus directly influencing the outcome of the war.

13 is representative of a modern radar magnetron.

Bulk tantalum is almost entirely alpha phase, and the beta phase usually exists as thin films obtained by magnetron

The spiraling of electrons in a cylindrical vacuum chamber within a transverse magnetic field is also employed in the magnetron, a device for producing high frequency radio waves ( microwaves ).

A magnetron is used to generate a plasma to form H < sup >−</ sup > near the metal surface.

In disk manufacturing, a thin coating is deposited on both sides of the substrate, mostly by a vacuum deposition process called magnetron sputtering.

Another hazard is the resonance of the magnetron tube itself.

He was also involved in the development of the cavity magnetron, which is used in microwave radar and microwave ovens.

The emission current as given above is many times greater than that normally collected by the electrodes, except in some pulsed valves such as the cavity magnetron.

The cavity magnetron is a vacuum tube with a filament in the center of an evacuated, lobed, circular cavity resonator.

The laboratory is equipped with major facilities including a vibrating sample magnetometer, high pressure mossbauer spectroscope and magnetron sputtering system, along with many others.

The orbital motion of ions in the radial plane is composed of two modes at frequencies which are called the magnetron and the modified cyclotron frequencies.

On an industrial scale the film deposition is done by magnetron sputter deposition ; on a laboratory scale molecular beam epitaxy, pulsed laser deposition and electron beam physical vapor deposition are also utilized.

The metal layer is deposited by magnetron sputtering and patterned by laser or lithography process.

However, using solid state chips to generate RF is approximately fifty times more expensive currently than using a magnetron and so only appropriate for high value lighting niches.

where is the axial trapping frequency due the axial electrical trapping and is the reduced cyclotron ( angular ) frequency and is the magnetron ( angular ) frequency.

* Berlin radar-most advanced airborne intercept radar of the WW II Luftwaffe in 1944-45, based on captured cavity magnetron technology, operated on SHF-band 3. 3 GHz frequency

In addition to the feedback oscillators described above, which use two-port amplifying active elements such as transistors and op amps, linear oscillators can also be built using one-port ( two terminal ) devices with negative resistance, such as magnetron tubes, tunnel diodes and Gunn diodes.

The high power of pulses from the cavity magnetron made centimeter-band radar practical, with shorter wavelength radars allowing detection of smaller objects.

and followed in 1937-1940 by a similar multi-cavity magnetron built by the British physicist, Sir John Turton Randall, FRSE together with a team of British coworkers for the British and American military radar installations in WWII.

* A transmitter that generates the radio signal with an oscillator such as a klystron or a magnetron and controls its duration by a modulator.

The specific heating effect of a beam of high-power microwaves was discovered accidentally in 1945, shortly after high-powered microwave radar transmitters were developed and widely disseminated by the Allies of World War II, using the British magnetron technology that was shared with the United States company, Raytheon, in order to secure production facilities to produce the magnetron.

In September 1940 the British Tizard Mission brought a number of new technologies to the United States, including a cavity magnetron, a high-powered device that generates microwaves using the interaction of a stream of electrons with a magnetic field.

American companies were then sought by the US government to perfect and mass-produce the magnetron for ground-based, airborne, and shipborne radar systems, and, with support from the Massachusetts Institute of Technology's Radiation Laboratory ( recently formed to investigate microwave radar ), Raytheon received a contract to build the devices.

Slater, in his experimental and theoretical work on the magnetron ( key elements paralleled his prior work with self-consistent fields for atoms ) and on other topics at the Radiation Laboratory and at the Bell Laboratories did " more than any other person to provide the understanding requisite to progress in the microwave field ", in the words of Mervin Kelley, then head of Bell Labs, quoted by Morse.

George H. Vineyard received his Ph. D. with Slater in 1943 for a study of space charge in the cavity magnetron.

Upon completion of his Phd with Douglas Hartree in 1940, Buneman joined Hartree's magnetron research group assisting the development of radar during World War II.

The H2S design team did not believe the klystron could do the job, and tests of an H2S built with klystrons instead of the cavity magnetron showed a drop in output power by a factor of 20 to 30.

UHV pressures are measured with an ion gauge, either a hot filament or an inverted magnetron type.

Cavity magnetron and crossed-field amplifier are not appropriate because noise introduced by these devices interfere with detection performance.

In 2012 Topanga Technologies introduced microwave quartz plasma lamps, driven by a solid state RF driver, thereby circumventing the limited life of magnetron based drivers, with system power of 127 and 230 Watts and system efficacies of 96 and 87 lumen / Watt, albeit with relative low CRI of 70.

Oliphant's group at Birmingham included Sir John Randall and Harry Boot who developed the resonant-cavity magnetron in 1940, achieving the short wavelengths needed for good airborne radars.

The magnetic field and voltages applied to the electrodes made the electrons form a thick sheet ( as in a cavity magnetron ) that went to only one anode.