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Article
Gyromultipliers of the Fifth Cyclotron Harmonic Based on High-Power Gyrotrons for Plasma Applications
We study theoretically the possibility of creating sources of terahertz radiation of high (up to several watts) power based on excitation of the fifth cyclotron harmonic in the frequency multiplication regime ...
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Article
Stabilization of the Radiation Frequency of a Gyrotron with a Remote Reflector Under the Conditions of Interaction of the Equidistant-Spectrum Modes
We study the possibility to stabilize the gyrotron frequency under the influence of a wave reflected from a remote output window during the competition of the operating mode with two neighboring modes, which h...
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Article
System of Electron Cyclotron Heating at the TRT Tokamak
Main parameters of the possible system of electron cyclotron resonance heating of the plasma for the compact tokamak with strong magnetic field (TRT) are presented. Preliminary estimates show that, to deposit ...
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Article
Tokamak with Reactor Technologies (TRT): Concept, Missions, Key Distinctive Features and Expected Characteristics
Important progress in the development of high-temperature superconductors (HTSC) of the second group made it possible to design the quasi-stationary tokamak with reactor technologies (TRT) with the high magnet...
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Article
An Experimental Study of the Influence of the Longitudinal Magnetic-Field Distribution Profile on the Output Characteristics of a Gyrotron
The influence of the magnetic-field profile in the gyrotron interaction space on the generation efficiency and frequency was experimentally studied. A profiled magnetic field was created by a system of several...
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Article
Phase Locking of a Gyrotron with Low-Frequency Voltage and Current Fluctuations by an External Monochromatic Signal
We show that during phase locking of the oscillations of a megawatt-level gyrotron by a relatively weak external monochromatic signal, the phase and frequency modulation of the gyrotron radiation due to the lo...
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Article
Dynamics of Multimode Processes at the Leading Edge of the Accelerating-Voltage Pulse in a Gyrotron Driven by an External Signal
We study the oscillation regimes for the model of a gyrotron with a fixed Gaussian longitudinal field structure and three modes of an equidistant spectrum (an operation mode and two satellites symmetrically sp...
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Article
The Concept of a Gyrotron with Megawatt Output at Both First and Second Cyclotron Harmonics for Plasma Heating in Spherical Tokamaks
Based on the analysis of electron–wave interaction, we study the possibility of develo** a gyrotron that is able to provide a megawatt output power in quasi-continuous (long-pulse) oscillations at both first...
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Article
Microwave Setup of a Megawatt Power Level for the ECR Plasma Heating and Current Drive System of the T-15MD Tokamak
As part of the creation of a unique T-15MD tokamak with a magnetic field of 2 T and an aspect ratio of 2.2, the first one of a series (8 pieces) of microwave setups of a megawatt power level for electron–cyclo...
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Article
Theoretical and Experimental Investigations of Terahertz-Range Gyrotrons with Frequency and Spectrum Control
We present the results of recent IAP RAS investigations, which were aimed at controlling the radiation frequency and spectrum of THz-range medium-power gyrotrons. Problems of extending the smooth frequency tun...
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Article
Investigation into Microwave Absorption in Semiconductors for Frequency-Multiplication Devices and Radiation-Output Control of Continuous and Pulsed Gyrotrons
The results of experimental investigation into the dielectric losses in GaAs, InP:Fe, and Si semiconductor crystals in the millimeter wavelength range (80–260 GHz) using the original precise method of measurin...
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Article
An Experimental Study of the External-Signal Influence on the Oscillation Regime of a Megawatt Gyrotron
The radiation-frequency locking by an external signal is experimentally studied for a megawatt gyrotron. An external signal from a magnetron is applied to the operation space of the gyrotron at a frequency of ...
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Article
Locking of the Frequency of a Multimode Gyrotron by a Quasi-Monochromatic External Signal
We consider the influence of an external quasi-monochromatic signal on a multimode gyrotron in the case where the signal frequency is close to the frequency of the operating mode of the gyrotron. The influence...
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Article
Studies of a Gyrotron Traveling-Wave Tube with Helically Corrugated Waveguides at IAP Ras: Results and Prospects
The gyrotron traveling-wave tube (gyro-TWT) is a wideband version of gyrotron amplifiers, which produce pulsed or continuous-wave radiation in the millimeter-wavelength band at a power level that exceeds the p...
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Article
Millimeter-Wave Gyrotron Research System. I. Description of the Facility
We describe a series of gyrotron facilities developed at the Institute of Applied Physics of the Russian Academy of Sciences for studying physical processes during interaction of millimeter-wave electromagneti...
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Article
Switching of Subterahertz Waves Within a Duration Range of Ten Orders of Magnitude
We consider nanosecond subterahertz waveguide switches based on a 3D resonator with an active element made of a semiconductor, whose conductivity is controlled by a laser. Recently discovered possibilities to ...
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Article
An Experimental Study of the Influence of an External Signal on the Generation Mode of a Megawatt-Power Gyrotron
The frequency capture of radiation by an external signal was experimentally studied for the first time for a megawatt-power gyrotron. An external signal from the magnetron at a frequency of 35 GHz entered the ...
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Article
A Waveguide Antenna with an Extended Angular Range for Remote Steering of Wave-Beam Direction
A new method for increasing the angular range of a waveguide antenna for remote steering of the wave-beam direction in thermonuclear-fusion experimental setups with plasma magnetic confinement is proposed. Cha...
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Article
A five-channel quasi-optical multiplexer of 12- to 90-GHz frequency range
An effective five-channel quasi-optical multiplexer, which distributes microwave signals of the frequency range of 12–90 GHz on five frequency channels, Ku, K, Ka, U, and E (frequency ranges of standard single-mo...
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Article
Improving the Efficiency of Quasi-Optical Bragg Reflectors
In the analysis of propagation of wave beams in quasi-optical transmission lines, the loss rate and transformation of modes by various elements of the transmission line are of great importance. The effects occ...
