Dual-Band Operation of Relativistic BWO With Linearly Polarized Gaussian Output

Elfrgani, Ahmed; Prasad, Sudhakar; Fuks, Mikhail; Schamiloglu, E.

doi:10.1109/tps.2014.2331334

Cited by 32 publications

(2 citation statements)

References 6 publications

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“…4 a , a simplified measurement setup using short HPM pulses is shown. The output pulse of the electron beam accelerator ‘SINUS‐6’ is applied to the backward wave oscillator–slow‐wave structure (BWO–SWS) [10, 26]. The SINUS‐6 can provide voltages up to 700 kV to a cathode with

130 normalΩ

load impedance in a 13 ns pulse.…”

Section: Measurement Setupmentioning

confidence: 99%

Short‐pulse HPM measurements using a resistive sensor

Ragulis

Andreev²,

Alleluia³

et al. 2020

IET Microwaves, Antennas & Propagation

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130 normalΩ

load impedance in a 13 ns pulse.…”

Section: Measurement Setupmentioning

confidence: 99%

Short‐pulse HPM measurements using a resistive sensor

Ragulis

Andreev²,

Alleluia³

et al. 2020

IET Microwaves, Antennas & Propagation

Self Cite

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“…1 Several HPM sources like transit time oscillator, relativistic backward wave oscillator, magnetically insulated line oscillator (MILO), and the hybrid combination of MILO-virtual cathode oscillator (VIRCATOR) have been developed to produce RF with couple of frequencies either in the same or in different bands. [2][3][4][5][6][7][8][9][10] MILO [4][5][6][7][8][9][10][11] is a cross field HPM device with the ability of producing GW level of peak power without external DC magnetic field guidance. This unique feature makes it special among the other HPM devices while fetching device compactness and light weight.…”

Section: Introductonmentioning

confidence: 99%

Performance improvement studies of axially partitioned dual band magnetically insulated line oscillator

2024

Physics of Plasmas

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In magnetically insulated line oscillator (MILO)s, a proportion of device current is responsible for the self-generated magnetic field that aids electron flow confinement in the anode cathode gap, thereby suitable RF generation. The device currents should not be high due to its direct impact on device efficiency, and electron energy depositions at load can lead to anode plasma formation. Also, the lower currents can facilitate the device to operate at larger voltages and/or for longer operational times. In this article, couple of axially partitioned dual band MILOs (DBMILO) designs that operate at lower device currents in comparison with the existing axially partitioned DBMILOs in the literature is presented. For one design with the radius of the slow wave structure (SWS), i.e., RSWS = 40 mm, the injection of the DC electron beam parameters 505 kV and 49 kA, generated an output RF power of ∼5.8 GW oscillating at 3.71 and 10.16 GHz (S-and X- bands) concurrently with ∼23.8% conversion efficiency. However, the other design (RSWS = 40.6 mm) at beam voltage 505 kV and device current of 47 kA generated an output RF power of >3.85 GW oscillating at 3.5 and 10.5 GHz, concurrently, where the frequencies are harmonically related. Thus, the proposed designs yielded significant device current reduction to ∼47 and ∼49 kA from ∼56 kA (existed), respectively, thereby drop of 16% and 12.5% to its counter designs, respectively. Also, there is substantial reduction in the electron energy depositions, thus the occurrence of anode plasma formations. Moreover, the peak conversion efficiency is enhanced to 23.4% and 16.4%, from 12.8%.

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Ka-band relativistic diffraction generator with a tapered coaxial Bragg reflector

et al. 2017

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A coaxial line with periodically tapered inner rode corrugated ripples is introduced to act as a distributed Bragg reflector to increase output microwave power of relativistic diffraction generator (RDG). The RDG device consists of an overmoded cross-section, two-sectional disk-loaded cylindrical slow-wave structure (SWS), and coaxial reflector is placed upstream at the first SWS section. The RDG device with tapered Bragg reflector is investigated by full three-dimensional Particle-in-Cell (PIC) simulations and experiments in this paper. The structural parameters of the reflector are optimized for favorable characteristic of mode selection and frequency response. It is found that oscillation modes varied at different magnetic field magnitude. The measured radiation power at 29∼31 GHz is over 300 MW for TM01 mode and over 700 MW for TM11 mode. Results show that the reflector has a great impact on performance of the device. Operating at proper conditions, the radiation power is remarkably enhanced.

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Dual-Band Operation of Relativistic BWO With Linearly Polarized Gaussian Output

Cited by 32 publications

References 6 publications

Short‐pulse HPM measurements using a resistive sensor

Short‐pulse HPM measurements using a resistive sensor

Performance improvement studies of axially partitioned dual band magnetically insulated line oscillator

Ka-band relativistic diffraction generator with a tapered coaxial Bragg reflector

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