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Development of high‐harmonic gyrotrons using a permanent magnet system

“…In the cavity shown in Fig. 5, our simulation results for efficiency indicate operation near a field intensity of 1.07 T [8]. (See Fig.…”

“…The electrons begin an axis-encircling gyration motion under the influence of the magnetic field. This situation is quite different from conventional gyrotrons, where the guiding center of a beam electron is located on a well-defined circle r = R [8]. Gyrating beam electrons leave an electron gun, follow the lines of force, and enter the resonant cavity.…”

The design of the gyrotron magnetic system

“…To obtain a proper magnetic field profile, hybrid solenoids are used [6]. In many approaches superconducting magnets are used [6], but other solutions are also explored such as permanent magnets [7], [8], warm superconducting magnets [9] and classical coper solenoids [10].…”

A Novel Large-Orbit Electron Gun Driving a W-Band Sixth-Harmonic Magnetron-Type Slotted Peniotron with a Permanent Magnet System

“…5) The objective of the work presented here is to develop a W-band low-magnetic field sixth-harmonic magnetron-type slotted peniotron with a permanent magnet system, besides the high conversion efficiency and less mode competition, which can have a much more compact size and lower cost and its operational gap (warm-up time) can be greatly reduced. 6,7) Finally, a designed practical electron gun with a gradual reversal of the magnetic field is used to drive the W-band sixth-harmonic magnetron-type slotted peniotron with a permanent magnet system. 8,9) Extensive efforts are underway to develop a high-frequency, high-efficiency, compact, and short-operational-gap microwave source.…”

“…5) is designed, which can greatly mitigate the above-mentioned problems. 6,7) Specifically, the NdFeB-32-MGOe permanent magnets provide the main magnetic field of the interaction region and the reverse field of the largeorbit electron gun, and the adjustable coils fine tune the magnitude and gradient of the magnetic field in the interaction region. 13) According to the magnetic field characteristics of the W-band sixth-harmonic peniotron, we propose the following requirements.…”