Characteristics of electron beam formed in diodes with magnetic insulation

Fedosov, A. I.; Litvinov, E. A.; Belomytsev, S. Ya.; Bugaev, S. P.

doi:10.1007/bf00898924

Cited by 26 publications

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“…Results of these measurements as well as results of computer simulations performed using PIC code show that the I-V characteristic at the front of the nanosecond-duration electron-beam pulse is different from the analogous dependence measured at the flat part of the pulse. In the steady-state (flat) part of the pulse, the measured electron-beam current is close to Fedosov-Belomytsev current [2], which is governed by the conservation law of electron momentum flow for any constant voltage. In the non steady-state part (front) of the pulse, the electron-beam current is considerably higher than the appropriate steady-state Fedosov-Belomytsev current and is close to the space-charge-limiting current determining the maximum electron beam current that a metallic tube is capable of supporting.…”

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confidence: 58%

“…It can be projected, also, that in the coaxial geometry of electron beam formation, where the Fedosov-Belomytsev current [2] is an analog of the Child-Langmuir current, the I-V characteristic of a short-pulse electron beam should similarly higher. This means that, when the electron-beam pulse duration is less than or comparable with the characteristic time determining the formation of the steady-state space charge distribution along the electron-beam drift path downstream from the cathode, the total electron beam current should be higher than the appropriate Fedosov-Belomytsev limit.…”

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confidence: 99%

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Measurements of the I-V Characteristic of Short-Pulse (10-15 ns) Electron Beams

Andreev

Schamiloglu

2007

2007 IEEE 34th International Conference on Plasma Science (ICOPS)

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It has been experimentally demonstrated [1] that the currentvoltage characteristic of a short-pulse electron beam (when the electron beam pulse duration is less than or comparable with the electron time-of-flight between the cathode and anode in the planar geometry of the electron diode) is considerable higher then the conventional Child-Langmuir limit. It can be projected, also, that in the coaxial geometry of electron beam formation, where the Fedosov-Belomytsev current [2] is an analog of the Child-Langmuir current, the I-V characteristic of a short-pulse electron beam should similarly higher. This means that, when the electron-beam pulse duration is less than or comparable with the characteristic time determining the formation of the steady-state space charge distribution along the electron-beam drift path downstream from the cathode, the total electron beam current should be higher than the appropriate Fedosov-Belomytsev limit. We measured the current-voltage characteristic of nanosecond-duration (10-15 ns) thin tubular relativistic (300-600 keV) electron beams accelerated in vacuum along the axis of a smooth uniform metal tube immersed in a strong axial magnetic field. Results of these measurements as well as results of computer simulations performed using PIC code show that the I-V characteristic at the front of the nanosecond-duration electron-beam pulse is different from the analogous dependence measured at the flat part of the pulse. In the steady-state (flat) part of the pulse, the measured electron-beam current is close to Fedosov-Belomytsev current [2], which is governed by the conservation law of electron momentum flow for any constant voltage. In the non steady-state part (front) of the pulse, the electron-beam current is considerably higher than the appropriate steady-state Fedosov-Belomytsev current and is close to the space-charge-limiting current determining the maximum electron beam current that a metallic tube is capable of supporting.

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confidence: 58%

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confidence: 99%

Measurements of the I-V Characteristic of Short-Pulse (10-15 ns) Electron Beams

Andreev

Schamiloglu

2007

2007 IEEE 34th International Conference on Plasma Science (ICOPS)

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“…In most cases, the cathode-anode gap is 10 cm, three times larger than the radial separation between the cathode and the external cylindrical section leading to the anode (3.3 cm) (the anode also acts as a reflector). The maximum current of an annular beam generated in a coaxial magnetically insulated gun under these conditions was obtained in [23] and is often referred to as Fedosov current. For the case of , Fedosov current is about three-quarters of the vacuum limiting current of a beam with the same parameters.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Overmoded GW-class surface-wave microwave oscillator

Vlasov

Shkvarunets

Rodgers

et al. 2000

IEEE Trans. Plasma Sci.

178

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Abstract-Results of theoretical and experimental studies of a GW-class, large diameter microwave oscillator are presented. The device consists of a large cross-section (overmoded), slow-wave structure with a unique profile of wall radius specifically designed to support surface waves and to provide a strong beam-wave coupling at moderate voltage (500 kV), an internal adjustable microwave reflector, a coaxial microwave extraction section, and a coaxial magnetically insulated field emission electron gun. In preliminary experiments carried out at 8.3 GHz, the power level exceeding 0.5 GW and efficiency of 15% have been measured calorimetrically.Index Terms-High-power microwave (HPM), overmoded, surface-wave oscillator.

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“…(2), (10), and (13) into Eqs. (14) and (15), we obtain the system of equations for solution of the selfconsistent problem for an axially uniform diode,…”

Section: D Model Of Single-stream Electron Motionmentioning

confidence: 99%

Two-dimensional single-stream electron motion in a coaxial diode with magnetic insulation

Fuks

Schamiloglu

2014

Physics of Plasmas

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Articles you may be interested inA distributed pumping model for a repetitive operated magnetically insulated transmission line oscillator J. Appl. Phys. 113, 164505 (2013); 10.1063/1.4803056 Moderately converging ion and electron flows in two-dimensional diodes Rev. Sci. Instrum. 83, 113301 (2012); 10.1063/1.4766461 A ceramic radial insulation structure for a relativistic electron beam vacuum diode Rev. Sci. Instrum. 79, 063303 (2008);One of the most widespread models of electrons drifting around the cathode in magnetrons is the single-stream state, which is the Brillouin stream with purely azimuthal motion. We describe a single-stream state in which electrons not only move in the azimuthal direction, but also along the axial direction, which is useful for consideration, for example, of relativistic magnetrons, MILOs, and coaxial transmission lines. Relations are given for the conditions of magnetic insulation for 2D electron motion, for 1D azimuthal and axial motion, and for synchronism of these streams with the operating waves of M-type microwave sources. Relations are also provided for the threshold of generation in magnetrons with 2D electron motion. V C 2014 AIP Publishing LLC. [http://dx.

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Characteristics of electron beam formed in diodes with magnetic insulation

Cited by 26 publications

References 0 publications

Measurements of the I-V Characteristic of Short-Pulse (10-15 ns) Electron Beams

Measurements of the I-V Characteristic of Short-Pulse (10-15 ns) Electron Beams

Overmoded GW-class surface-wave microwave oscillator

Two-dimensional single-stream electron motion in a coaxial diode with magnetic insulation

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