Publication

Startup Methods for Single-Mode Gyrotron Operation

Stefano Alberti, Minh Quang Tran, Trach-Minh Tran
1995
Journal Articles

Abstract

Experimental start-up results of a 118 GHz TE(22,6) gyrotron are presented and compared with theory. The theoretical excitation regimes of competing modes are computed in the energy-velocity-pitch-angle plane. The start-up paths through the plane are determined by the time evolution of the beam parameters during the start-up phase and are seen to determine the cavity oscillating mode. Experimental results show that competition between the TE(22,6) and TE-(19,7) modes can be completely eliminated by using the proper start-up method in a case where a typical triode start-up results in oscillation in the competing TE-(19,7) mode. These new results, applicable to any arbitrary gyrotron cavity mode, are shown to be in excellent agreement with theory.

Official source

https://infoscience.epfl.ch/entities/publication/424704e3-e909-40a1-98a4-cda7aa884a41

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Stefano Alberti, Minh Quang Tran, Trach-Minh Tran
1995
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/424704e3-e909-40a1-98a4-cda7aa884a41

About this result

Related concepts (32)

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.

Klystron

A klystron is a specialized linear-beam 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. Low-power klystrons are used as oscillators in terrestrial microwave relay communications links, while high-power klystrons are used as output tubes in UHF television transmitters, satellite communication, radar transmitters, and to generate the drive power for modern particle accelerators.

Microwave

Microwave is a form of electromagnetic radiation with wavelengths ranging from about 30 centimeters to one millimeter corresponding to frequencies between 1000 MHz and 300 GHz respectively. Different sources define different frequency ranges as microwaves; the above broad definition includes UHF, SHF and EHF (millimeter wave) bands. A more common definition in radio-frequency engineering is the range between 1 and 100 GHz (wavelengths between 0.3 m and 3 mm). In all cases, microwaves include the entire SHF band (3 to 30 GHz, or 10 to 1 cm) at minimum.

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Startup Methods for Single-Mode Gyrotron Operation

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