Pulsewidth Variation of an Axial Vircator

Roy, Amitava; Singh, Sandeep; Menon, R.; Kumar, Dinesh; Khandekar, Saket; Somu, Vijay Bhaskar; Chottray, Susant; Saroj, P. C.; Nagesh, K. V.; Mittal, K. C.; Chakravarthy, D. P.

doi:10.1109/tps.2010.2048581

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…Applying a large spectrum of methods from central tendencies approaches [6,7] to Extreme Value Theory (EVT) techniques [8], it has been shown how the confidence level of physical quantities can be assessed when dealing with random variables (RVs) [9]. Most studies in High Power Electromagnetics (HPEM) applications involving stochastic analysis focus on the general tendencies of physical quantities such as the ANOVA methodology which has been applied to Vircators in [10][11][12][13]. However, only a few studies were devoted to infer results on the distribution of extreme values, which would be a natural extension of the studies on central tendencies, mostly because of the difficulty to access experimentally the required data sets or due to the demanding computation power required to simulate complex and volatile systems.…”

Section: Introductionmentioning

confidence: 99%

A Framework for Peak Power Exceedances of High Power Microwave Radiators Applied to a Vircator Surrogate Model

AlMansoori¹,

Neira²,

Lalléchère³

et al. 2021

PIER B

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Uncertainty quantification and variability analysis are two domains of interest when looking at the efficiency of HPEM sources. Vircator is known to be a low efficiency high power microwave source subject to several generally volatile phenomena such as plasma expansion and shot-to-shot variability. In this study, a computationally low cost framework combining the Extreme Value Theory (EVT) and the Generalised Design of Experiments is proposed in order to study the peak power distribution of a Vircator obtained with a surrogate model. Following the pre-screening of random variables, the optimised parameters are introduced in 2.5D and 3D simulation tools, namely XOOPIC and CST-PS. It has been confirmed that the peak power output can reach a 40% increase. This shows that the EVT proves to be successful in classifying and quantifying random variables to influence the distribution tails.

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Section: Introductionmentioning

confidence: 99%

A Framework for Peak Power Exceedances of High Power Microwave Radiators Applied to a Vircator Surrogate Model

AlMansoori¹,

Neira²,

Lalléchère³

et al. 2021

PIER B

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“…During the last decades, several statistical methods have been applied to electromagnetic [13]- [15], mechanical problems [16], and Vircator studies [17]- [20]. From crude Monte Carlo (MC) [21], [22] (known as a brute force technique) to Polynomial Chaos [23], [24], it has been shown how the confidence level could be assessed when dealing with random variables [25].…”

Section: Introductionmentioning

confidence: 99%

Assessing Vircators’ Reliability Through Uncertainty and Sensitivity Analyses Using a Surrogate Model

et al. 2020

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“…This generally means that the virtual cathode area must be contained in a resonant cavity with volume and time larger than that of the interaction area. The cavity is useful to reduce the bandwidth, increase the efficiency and provide directional radiation [4,5]. Microwaves can be used in warfare as electromagnetic bombs [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental studies on DC axial virtual cathode electric discharge

Shager

El-Latif

2019

Arab Journal of Nuclear Sciences and Applications

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A new modification is carried out on the axial virtual cathode oscillator to improve the device performance. The device operates, according to the virtual cathode theory, to generate high power microwaves from the interaction between the energetic electron beam and virtual cathode field. The electrical parameters are measured to understand the behavior of the discharge by the use of the nitrogen gas. The breakdown potential V b against Pd is investigated. A single electric probe is used to measure and estimate the plasma parameters. The virtual cathode position is defined from the axial distribution of electron density, electric field and plasma potential. The position of the virtual cathode has been estimated to be at about 2 cm from the mesh anode which can be confirmed from changing the electric field direction and from the maximum value of plasma density in that position. The exposed samples to microwave radiation ensure the effects of the microwave radiation on them.

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Pulsewidth Variation of an Axial Vircator

Cited by 12 publications

References 14 publications

A Framework for Peak Power Exceedances of High Power Microwave Radiators Applied to a Vircator Surrogate Model

A Framework for Peak Power Exceedances of High Power Microwave Radiators Applied to a Vircator Surrogate Model

Assessing Vircators’ Reliability Through Uncertainty and Sensitivity Analyses Using a Surrogate Model

Experimental studies on DC axial virtual cathode electric discharge

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