# Gyrotron

A gyrotron is a class of high-power linear-beam vacuum tubes that generates millimeter-wave electromagnetic waves by the cyclotron resonance of electrons in a strong magnetic field. Output frequencies range from about 20 to 527 GHz, covering wavelengths from microwave to the edge of the terahertz gap. Typical output powers range from tens of kilowatts to 1–2 megawatts. Gyrotrons can be designed for pulsed or continuous operation. The gyrotron was invented by Soviet scientists at NIRFI, based in Nizhny Novgorod, Russia.

## Principle

The gyrotron is a type of free-electron maser that generates high-frequency electromagnetic radiation by stimulated cyclotron resonance of electrons moving through a strong magnetic field. It can produce high power at millimeter wavelengths because, as a fast-wave device, its dimensions can be much larger than the wavelength of the radiation. This is unlike conventional microwave vacuum tubes such as klystrons and magnetrons, in which the wavelength is determined by a single-mode resonant cavity, a slow-wave structure. Thus, as operating frequencies increase, the resonant cavity structures must decrease in size, which limits their power-handling capability.
In the gyrotron, a hot filament in an electron gun (1) at one end of the tube emits an annular-shaped (hollow tubular) beam of electrons (6), which is accelerated by a high-voltage DC anode (10) and then travels through a large tubular resonant cavity structure (2) in a strong axial magnetic field, usually created by a superconducting magnet around the tube (8). The field causes the electrons to move helically in tight circles around the magnetic field lines as they travel lengthwise through the tube. At the position in the tube where the magnetic field reaches its maximum (2), the electrons radiate electromagnetic waves, parallel to the axis of the tube, at their cyclotron resonance frequency. The millimeter radiation forms standing waves in the tube, which acts as an open-ended resonant cavity, and is formed into a beam. The beam is converted by a mode converter (9) and reflected by mirrors (4), which direct it through a window (5) in the side of the tube into a microwave waveguide (7). A collector electrode absorbs the spent electron beam at the end of the tube (3).
As in other linear-beam microwave tubes, the energy of the output electromagnetic waves comes from the kinetic energy of the electron beam, which is due to the accelerating anode voltage (10). In the region before the resonant cavity where the magnetic field strength is increasing, it compresses the electron beam, converting the longitudinal drift velocity to transverse orbital velocity, in a process similar to that occurring in a magnetic mirror used in plasma confinement. The orbital velocity of the electrons is 1.5 to 2 times their axial beam velocity. Due to the standing waves in the resonant cavity, the electrons become "bunched"; that is, their phase becomes coherent (synchronized), so they are all at the same point in their orbit at the same time. Therefore, they emit coherent radiation.
The electron speed in a gyrotron is slightly relativistic (on the order of but not close to the speed of light). This contrasts to the free-electron laser (and xaser) that work on different principles and whose electrons are highly relativistic.

## Applications

Gyrotrons are used for many industrial and high-technology heating applications. For example, gyrotrons are used in nuclear fusion research experiments to heat plasmas and also in the manufacturing industry as a rapid heating tool in processing glass, composites, and ceramics, as well as for annealing (solar and semiconductors). Military applications include the Active Denial System.
In 2021 Quaise Energy announced the idea of using a gyrotron as a boring machine to drill a hole 20 kilometers in depth and use it to produce geothermal energy. The technique would use frequencies of 30 to 300 GHz and would transfer energy to a rock 10$^{12}$ more efficiently than using a laser. Lasers would further be disrupted by the vaporized rock, which would affect the longer wavelength much less. Drilling rates of 70 meters/hour appear to be possible with a 1-MW gyrotron.

## Types

The output window of the tube from which the microwave beam emerges can be in two locations. In the transverse-output gyrotron, the beam exits through a window on the side of the tube. This requires a 45° mirror at the end of the cavity to reflect the microwave beam, positioned at one side so the electron beam misses it. In the axial-output gyrotron, the beam exits through a window at the end of the tube at the far end of the cylindrical collector electrode which collects the electrons.
The original gyrotron developed in 1964 was an oscillator, but since that time gyrotron amplifiers have been developed. The helical gyrotron electron beam can amplify an applied microwave signal similarly to the way a straight electron beam amplifies in classical microwave tubes such as the klystron, so there is a series of gyrotrons that function analogously to these tubes. Their advantage is that they can operate at much higher frequencies. The gyro-monotron (gyro-oscillator) is a single-cavity gyrotron that functions as an oscillator. A gyro-klystron is an amplifier that functions analogously to a klystron tube. Has two microwave cavities along the electron beam, an input cavity upstream to which the signal to be amplified is applied and an output cavity downstream from which the output is taken. A gyro-TWT is an amplifier that functions analogously to a travelling wave tube (TWT). It has a slow wave structure similar to a TWT paralleling the beam, with the input microwave signal applied to the upstream end and the amplified output signal taken from the downstream end. A gyro-BWO is an oscillator that functions analogously to a backward wave oscillator (BWO). It generates oscillations traveling in an opposite direction to the electron beam, which is output at the upstream end of the tube. A gyro-twystron is an amplifier that functions analogously to a twystron, a tube that combines a klystron and a TWT. Like a klystron, it has an input cavity at the upstream end followed by buncher cavities to bunch the electrons, which are followed by a TWT-type slow-wave structure that develops the amplified output signal. Like a TWT, it has a wide bandwidth.

## Manufacturers

The gyrotron was invented in the Soviet Union. Present makers include Communications & Power Industries (USA), Gycom (Russia), Thales Group (EU), Toshiba (Japan, now Canon, Inc., also from Japan), and Bridge12 Technologies. System developers include Gyrotron Technology.