Abstract
This paper is concerned with the analysis and design of a gyrotron oscillator with 460 GHz that can excite both modes (TE231) the fundamental (230GHz) and (TE061, TE261) second harmonic (near 460GHz). The oscillator is operated with 12KV beam voltage and 100mA beam current, and a computer program was developed to study the cavity in this oscillator and the wave-particle interaction inside it using the forward finite difference technique as a numerical method. The input data of the program are electron energy, velocity ratio, normalized cavity length, the normalized value of the external magnetic field, the mode number (m,n,l), and nth-non van shining root of J_m^' (x)=0 to calculate the beam and starting currents, frequency and quality factor of the cavity. The results show good agreement with other reported works [10]- [12]- [13]- [14], [15] .This oscillator can serve as a millimeter-wave source at the magnetic field of (16.4T) for enhanced nuclear magnetic resonance and can be used to perform the biological experiment.
Highlights
IntroductionThe electromagnetic spectrum between (300-3000GHz), is interested in Radar applications in Communications, and spectroscopy [1]-[ 2],[ 3]
A single open-cavity configuration in which an annular mono energetic electron beams sustaining a constant amplitude normal mode of oscillation is considered, the electron emitted by the magnetron injection gun move with a helical path interacting with the wave in the cavity, the electron beam gathers on the collector
While the program calculates the initial electron guiding center position using Equation (5). It computes at each time step the electron position in (r,φ,z) and its energy, and the efficiency from equation(10)
Summary
The electromagnetic spectrum between (300-3000GHz), is interested in Radar applications in Communications, and spectroscopy [1]-[ 2],[ 3]. At frequencies (100-170GHz) plasma heating for fusion application. The region of interaction with the electron beam in microwave devices necessarily scales with the wavelength, the increasing frequency of these devices utility above 140GHz. The operating wavelength is smaller than the physical dimensions of the resonator [4]. The highest frequency is 889GHz at Fukui University in Japan [5]. The second harmonic operation of a soviet gyrotron frequency is 326GHz with a power of 1.5 kW [6]. To elevated ohm losses depending on the
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