A Uniform, Pulsed Magnetic Field Coil for Gigawatt Operation of Relativistic Backward-Wave Oscillator

Chandra, Rohit; Sharma, Vishnu; Kalyanasundaram, Senthil; Singh, Sandeep; Roy, Amitava; Mondal, Jayanta; Mitra, S.; Patel, Ankur; Biswas, Debabrata; Sharma, Archana

doi:10.1109/tps.2018.2850353

Cited by 10 publications

(5 citation statements)

References 13 publications

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“…To replicate the experimental KALI pulse, the actual device runs on a simulated high-voltage pulse (~550V) for a short period (~100ns) (Chandra et al, 2018). The simulated magnetic field has a maximum magnitude of ~0.5T and a spatial profile represented by a fifth-order polynomial in z-coordinate.…”

Section: Resultsmentioning

confidence: 99%

“…The design of the BWO (Chandra et al, 2018;Banerjee et al, 2020) shown in Figure 1 is modelled using Magic3D PIC code developed by ATK Mission Systems, USA (Tan et al, 2009). Here, a SWS can be seen and it is one of the six configurations under study.…”

Section: Materials and Methods Design Consideration Of Bwomentioning

confidence: 99%

“…This paper compares six different annular beamdriven BWO configurations for their peak output power, output power frequency and efficiency. These six configurations are modified versions of the BWO design presented by (Chandra et al, 2018;Banerjee et al, 2020) and can be listed as follows:…”

Section: Introductionmentioning

confidence: 99%

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Annular Beam Driven Metamaterial Backward Wave Oscillator

Vengurlekar,

Saxena

2024

IJERR

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Metamaterials (MTMs) are synthetic materials designed to have characteristics that "may not be readily available in nature," such as negative permittivity, reversed Doppler Effect, reversed Cherenkov Effect, and negative Refractive Index. These characteristics have motivated researchers to analyze and investigate the use of MTMs for modelling high-power microwave (HPM) radiation sources. One of the most potential HPM sources is an annular beam-driven Backward-Wave Oscillator (BWO) based on the Cerenkov mechanism. The devices that use the Cerenkov mechanism are preferred due to their larger bandwidth. Its high output power and repetition operations make it a promising source. In this paper, an annular beam-loaded metamaterial BWO is simulated in order to investigate and comment on the possibility of metamaterial or metamaterial-inspired structures replacing the slow-wave structures (SWSs) in vacuum tube devices. Performance parameters of several BWO configurations loaded with different metamaterial-inspired conductor rings are compared to rippled SWS-based BWOs. The results suggest that fewer metamaterial rings with solid cross-section (CS) inside the BWO lead to a closer match in generated output power and frequency with the output power generated using a rippled SWS.

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Section: Resultsmentioning

confidence: 99%

Section: Materials and Methods Design Consideration Of Bwomentioning

confidence: 99%

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Annular Beam Driven Metamaterial Backward Wave Oscillator

Vengurlekar,

Saxena

2024

IJERR

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“…Currently, there is a need for efficient high-power microwave radiation sources for advanced radars, security detectors, plasma chemistry reactors, material processing instruments, medical/biomedical research instruments, and so on. [1][2][3][4] Among the known sources for high power microwave (HPM) generation, the most known can be listed broadly as backward wave oscillator (BWOs), extended interaction klystron, traveling wave tubes, gyrotrons, magnetrons, free electron lasers, and so on. The relativistic backward-wave oscillators (RBWO) using the Cerenkov mechanism is one of the most promising HPM sources due to its high output power and high repetition operations.…”

Section: Introductionmentioning

confidence: 99%

Enhanced efficiency of C‐band sheet beam driven backward wave oscillator guided by periodic magnetic field

Banerjee¹,

Hadap

Saxena³

et al. 2020

Micro & Optical Tech Letters

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In this article we present the effect of periodic magnetic field on the efficiency of a sheet beam driven C-band backward wave oscillator (operational in Megawatt power regime) through MAGIC3D PIC simulation. At 90 kV beam energy, 200 A beam current, and 0.6 T average magnetic field, our results depict an efficiency of nearly 70% due to improved electron beam confinement and electron bunching. A qualitative comparison is shown for efficiency through the same slow wave structure, guided by a uniform axial magnetic and the proposed periodic magnetic field. Efficiency enhancement of nearly 20% is observed in case of periodic magnetic field.

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“…The guiding Magnetic field may be generated by means of a super conducting coil, water cooled DC coil or pulsed magnetic field coil [11,12]. For single pulse system it is always preferable to use a pulsed magnetic field coil.…”

Section: Introductionmentioning

confidence: 99%

X-band BWO directly driven by a Marx generator

et al. 2020

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A: X-band Resonant Reflector (RR) based Backward Wave Oscillators (BWO) has been designed and tested on a Marx generator. Output power dependence on the Resonant Reflector-BWO separation as well as on the applied magnetic field has been investigated using particle-in-cell (PIC) simulation. It was observed that the output power gets maximized for 3.0 T guiding magnetic field. The PIC simulation predicted BWO frequency as 9.22 GHz. BWO is operated on a Marx generator with peak diode voltage of 400 kV, and 4.0 kA as peak current. Microwave power was measured by D-dot probe placed in the far field region of the transmitting antenna. The measured peak output power was 120 MW at 9.35 GHz frequency for 0.7 T guiding magnetic field. At high magnetic field of 3.0 T the BWO peak power increased to 350 MW, however the frequency reduces to 9.25 GHz.

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A Uniform, Pulsed Magnetic Field Coil for Gigawatt Operation of Relativistic Backward-Wave Oscillator

Cited by 10 publications

References 13 publications

Annular Beam Driven Metamaterial Backward Wave Oscillator

Annular Beam Driven Metamaterial Backward Wave Oscillator

Enhanced efficiency of C‐band sheet beam driven backward wave oscillator guided by periodic magnetic field

X-band BWO directly driven by a Marx generator

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