High-Power Microwave Generation from a Large-Orbit Gyrotron in Vane and Hole-and-Slot Conducting Wall Geometries

Lawson, W.; Destler, W.W.; Striffler, C. D.

doi:10.1109/tps.1985.4316458

Cited by 81 publications

(12 citation statements)

References 14 publications

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“…In [19][20][21][22], a nonadiabatic electron-optical system with a magnetic-field cusp was used to drive the beam instead of a high-power pump wave. In [20], a cylindrical cavity with deep azimuthal corrugations of the walls was used as a selective electrodynamic system.…”

Section: Small-and Large-orbit Gyrotronsmentioning

confidence: 99%

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Large-orbit Subterahertz and Terahertz gyrotrons

Bratman

Kalynov

Мануилов

2009

Radiophys Quantum El

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We review briefly the main ideas and achievements in the field of physics related to shortwavelength large-orbit gyrotrons, in which the coupling of electrons with the working mode and the discrimination of parasitic modes in the case of resonance at the high cyclotron harmonic are more efficient compared with conventional gyrotrons. The results of studying a new large-orbit gyrotron with moderate electron energies of 50-80 keV and comparatively low magnetic fields of 10.5-14 T are presented. In this gyrotron, high-power single-mode generation was obtained at the second and third cyclotron harmonics in the frequency range 0.55-1.00 THz. The prospects of development and application of short-wavelength large-orbit gyrotrons are discussed. SMALL-AND LARGE-ORBIT GYROTRONSThe conventional gyrotron with many off-axis elec-B B a) b) Fig. 1. Projections of electron trajectories onto the cross section of the cavity in a conventional gyrotron at the fundamental cyclotron resonance (a) and in a LOG at the high cyclotron harmonic (b).tron beamlets [1] and the gyrotron with an axis-encircling electron beam [2] were proposed and demonstrated in 1965 and 1968, respectively. A type of the oscillator with an axis-encircling beam, in which electrons move along helical trajectories around the axis of an axisymmetric electrodynamic system, is called a large-orbit gyrotron (LOG). This name is related to the fact that the LOG is usually operated at the high cyclotron harmonic and, therefore, the magnetic field in it, for the same operating frequency, is lower and the Larmor radius of electrons is greater compared with the conventional "small-orbit" gyrotron which is operated at the fundamental cyclotron resonance or the second cyclotron harmonic (Fig. 1). In the case where the conventional gyrotron and the LOG are operated at the same resonant harmonic, the electron "orbit" in them is the same and is determined by the Larmor radius of the electron in the same magnetic field.It should be emphasized that the conventional gyrotrons are perfect oscillators which provide, in particular, a radiation power of 1 MW in the quasi-continuous-wave regime at a high frequency of 0.17 THz with an efficiency of 50% (see, e.g., [3,4]). Conventional gyrotrons also work in the submillimeter-wave range [5][6][7][8] and recently have been used to overcome a 1-THz frequency when operated at the fundamental cyclotron resonance [9] and the second cyclotron harmonic [10]. At the same time, despite their relatively long history, LOGs have been realized in a comparatively small number of experiments and are still at the stage of fundamental research. Nevertheless, LOGs are still fairly attractive for operation at the high cyclotron harmonics since they ensure a more efficient coupling of electrons with the working-mode field and,

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Section: Small-and Large-orbit Gyrotronsmentioning

confidence: 99%

“…In [20], a cylindrical cavity with deep azimuthal corrugations of the walls was used as a selective electrodynamic system. The use of a nanosecond ultrarelativistic electron beam in the LOG allowed one to excite the 20th harmonic of the gyrofrequency at a frequency of 15.5 GHz with a power of 0.5 GW.…”

Section: Small-and Large-orbit Gyrotronsmentioning

confidence: 99%

Large-orbit Subterahertz and Terahertz gyrotrons

Bratman

Kalynov

Мануилов

2009

Radiophys Quantum El

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“…Along with the already realized unique sources such as conventional gyrotrons with very strong magnetic fields [1][2][3][4][5] and free-electron lasers [6,7], the so-called large-orbit gyrotrons (LOGs) [8][9][10][11][12][13][14][15], which previously operated in centimeter-and millimeter-wave ranges, seem to be more promising and, possibly, simpler for the case of submillimeter waves. As opposed to a conventional gyrotron in which electrons move along the helical trajectories whose axes are uniformly distributed over the circumference (or in a thin ring) with radius significantly exceeding the Larmor radius of particles, all particles in the LOGs perform the Larmor rotation round the cavity axis as they move along this axis.…”

Section: Introductionmentioning

confidence: 99%

Submillimeter-wave large-orbit gyrotron

Bratman

Kalynov

Мануилов

et al. 2005

Radiophys Quantum Electron

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We develop a thermionic-emission electron-optical system forming a dense beam of electrons moving along helical trajectories round the axis of a gyrotron cavity. The maximum beam current is 4 A and the pitch-factor of electrons is 1.0 for a particle energy of 250 keV and a pulse duration of 10 µs. Using such a beam in a gyrotron operated at the third cyclotron harmonic, we obtain single-mode oscillation with a power of 10 µs in the T E 3,8 and T E 3,9 modes with frequencies 371 and 414 GHz, respectively.

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“…We anticipate that the problems encountered at higher harmonics may be solved by utilizing output cavities with field profiles which are more favorable for energy extraction. Potential candidates include vane resonator [5] and dielectric-lined [4] cavities.…”

Section: High Harmonic Operationmentioning

confidence: 99%

Theoretical investigation of axially-modulated, cusp-injected, large-orbit gyrotrons

Lawson

Destler

Proceedings of 1994 IEEE International Electron Devices Meeting

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We present a simple analytic model of a novel microwave device that utilizes the axial bunching mechanism of klystrons in conjunction with the energy extraction mechanism of gyrotrons. The viability of this device is demonstrated via preliminary theoretical modeling of a im 0-cavity amplifier that predicts efficiencies above 40% over a range of harmonic numbers with a 100 kV, 25 A beam. Details of the device operation and sensitivity to parameter variations are given.

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High-Power Microwave Generation from a Large-Orbit Gyrotron in Vane and Hole-and-Slot Conducting Wall Geometries

Cited by 81 publications

References 14 publications

Large-orbit Subterahertz and Terahertz gyrotrons

Large-orbit Subterahertz and Terahertz gyrotrons

Submillimeter-wave large-orbit gyrotron

Theoretical investigation of axially-modulated, cusp-injected, large-orbit gyrotrons

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